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Generic:

Browse Source 
- Use memdup_array_user() to harden against overflow.
 
 - Unconditionally advertise KVM_CAP_DEVICE_CTRL for all architectures.
 
 - Clean up Kconfigs that all KVM architectures were selecting
 
 - New functionality around "guest_memfd", a new userspace API that
   creates an anonymous file and returns a file descriptor that refers
   to it.  guest_memfd files are bound to their owning virtual machine,
   cannot be mapped, read, or written by userspace, and cannot be resized.
   guest_memfd files do however support PUNCH_HOLE, which can be used to
   switch a memory area between guest_memfd and regular anonymous memory.
 
 - New ioctl KVM_SET_MEMORY_ATTRIBUTES allowing userspace to specify
   per-page attributes for a given page of guest memory; right now the
   only attribute is whether the guest expects to access memory via
   guest_memfd or not, which in Confidential SVMs backed by SEV-SNP,
   TDX or ARM64 pKVM is checked by firmware or hypervisor that guarantees
   confidentiality (AMD PSP, Intel TDX module, or EL2 in the case of pKVM).
 
 x86:
 
 - Support for "software-protected VMs" that can use the new guest_memfd
   and page attributes infrastructure.  This is mostly useful for testing,
   since there is no pKVM-like infrastructure to provide a meaningfully
   reduced TCB.
 
 - Fix a relatively benign off-by-one error when splitting huge pages during
   CLEAR_DIRTY_LOG.
 
 - Fix a bug where KVM could incorrectly test-and-clear dirty bits in non-leaf
   TDP MMU SPTEs if a racing thread replaces a huge SPTE with a non-huge SPTE.
 
 - Use more generic lockdep assertions in paths that don't actually care
   about whether the caller is a reader or a writer.
 
 - let Xen guests opt out of having PV clock reported as "based on a stable TSC",
   because some of them don't expect the "TSC stable" bit (added to the pvclock
   ABI by KVM, but never set by Xen) to be set.
 
 - Revert a bogus, made-up nested SVM consistency check for TLB_CONTROL.
 
 - Advertise flush-by-ASID support for nSVM unconditionally, as KVM always
   flushes on nested transitions, i.e. always satisfies flush requests.  This
   allows running bleeding edge versions of VMware Workstation on top of KVM.
 
 - Sanity check that the CPU supports flush-by-ASID when enabling SEV support.
 
 - On AMD machines with vNMI, always rely on hardware instead of intercepting
   IRET in some cases to detect unmasking of NMIs
 
 - Support for virtualizing Linear Address Masking (LAM)
 
 - Fix a variety of vPMU bugs where KVM fail to stop/reset counters and other state
   prior to refreshing the vPMU model.
 
 - Fix a double-overflow PMU bug by tracking emulated counter events using a
   dedicated field instead of snapshotting the "previous" counter.  If the
   hardware PMC count triggers overflow that is recognized in the same VM-Exit
   that KVM manually bumps an event count, KVM would pend PMIs for both the
   hardware-triggered overflow and for KVM-triggered overflow.
 
 - Turn off KVM_WERROR by default for all configs so that it's not
   inadvertantly enabled by non-KVM developers, which can be problematic for
   subsystems that require no regressions for W=1 builds.
 
 - Advertise all of the host-supported CPUID bits that enumerate IA32_SPEC_CTRL
   "features".
 
 - Don't force a masterclock update when a vCPU synchronizes to the current TSC
   generation, as updating the masterclock can cause kvmclock's time to "jump"
   unexpectedly, e.g. when userspace hotplugs a pre-created vCPU.
 
 - Use RIP-relative address to read kvm_rebooting in the VM-Enter fault paths,
   partly as a super minor optimization, but mostly to make KVM play nice with
   position independent executable builds.
 
 - Guard KVM-on-HyperV's range-based TLB flush hooks with an #ifdef on
   CONFIG_HYPERV as a minor optimization, and to self-document the code.
 
 - Add CONFIG_KVM_HYPERV to allow disabling KVM support for HyperV "emulation"
   at build time.
 
 ARM64:
 
 - LPA2 support, adding 52bit IPA/PA capability for 4kB and 16kB
   base granule sizes. Branch shared with the arm64 tree.
 
 - Large Fine-Grained Trap rework, bringing some sanity to the
   feature, although there is more to come. This comes with
   a prefix branch shared with the arm64 tree.
 
 - Some additional Nested Virtualization groundwork, mostly
   introducing the NV2 VNCR support and retargetting the NV
   support to that version of the architecture.
 
 - A small set of vgic fixes and associated cleanups.
 
 Loongarch:
 
 - Optimization for memslot hugepage checking
 
 - Cleanup and fix some HW/SW timer issues
 
 - Add LSX/LASX (128bit/256bit SIMD) support
 
 RISC-V:
 
 - KVM_GET_REG_LIST improvement for vector registers
 
 - Generate ISA extension reg_list using macros in get-reg-list selftest
 
 - Support for reporting steal time along with selftest
 
 s390:
 
 - Bugfixes
 
 Selftests:
 
 - Fix an annoying goof where the NX hugepage test prints out garbage
   instead of the magic token needed to run the test.
 
 - Fix build errors when a header is delete/moved due to a missing flag
   in the Makefile.
 
 - Detect if KVM bugged/killed a selftest's VM and print out a helpful
   message instead of complaining that a random ioctl() failed.
 
 - Annotate the guest printf/assert helpers with __printf(), and fix the
   various bugs that were lurking due to lack of said annotation.
 
 There are two non-KVM patches buried in the middle of guest_memfd support:
 
   fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()
   mm: Add AS_UNMOVABLE to mark mapping as completely unmovable
 
 The first is small and mostly suggested-by Christian Brauner; the second
 a bit less so but it was written by an mm person (Vlastimil Babka).
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm updates from Paolo Bonzini:
 "Generic:

   - Use memdup_array_user() to harden against overflow.

   - Unconditionally advertise KVM_CAP_DEVICE_CTRL for all
     architectures.

   - Clean up Kconfigs that all KVM architectures were selecting

   - New functionality around "guest_memfd", a new userspace API that
     creates an anonymous file and returns a file descriptor that refers
     to it. guest_memfd files are bound to their owning virtual machine,
     cannot be mapped, read, or written by userspace, and cannot be
     resized. guest_memfd files do however support PUNCH_HOLE, which can
     be used to switch a memory area between guest_memfd and regular
     anonymous memory.

   - New ioctl KVM_SET_MEMORY_ATTRIBUTES allowing userspace to specify
     per-page attributes for a given page of guest memory; right now the
     only attribute is whether the guest expects to access memory via
     guest_memfd or not, which in Confidential SVMs backed by SEV-SNP,
     TDX or ARM64 pKVM is checked by firmware or hypervisor that
     guarantees confidentiality (AMD PSP, Intel TDX module, or EL2 in
     the case of pKVM).

  x86:

   - Support for "software-protected VMs" that can use the new
     guest_memfd and page attributes infrastructure. This is mostly
     useful for testing, since there is no pKVM-like infrastructure to
     provide a meaningfully reduced TCB.

   - Fix a relatively benign off-by-one error when splitting huge pages
     during CLEAR_DIRTY_LOG.

   - Fix a bug where KVM could incorrectly test-and-clear dirty bits in
     non-leaf TDP MMU SPTEs if a racing thread replaces a huge SPTE with
     a non-huge SPTE.

   - Use more generic lockdep assertions in paths that don't actually
     care about whether the caller is a reader or a writer.

   - let Xen guests opt out of having PV clock reported as "based on a
     stable TSC", because some of them don't expect the "TSC stable" bit
     (added to the pvclock ABI by KVM, but never set by Xen) to be set.

   - Revert a bogus, made-up nested SVM consistency check for
     TLB_CONTROL.

   - Advertise flush-by-ASID support for nSVM unconditionally, as KVM
     always flushes on nested transitions, i.e. always satisfies flush
     requests. This allows running bleeding edge versions of VMware
     Workstation on top of KVM.

   - Sanity check that the CPU supports flush-by-ASID when enabling SEV
     support.

   - On AMD machines with vNMI, always rely on hardware instead of
     intercepting IRET in some cases to detect unmasking of NMIs

   - Support for virtualizing Linear Address Masking (LAM)

   - Fix a variety of vPMU bugs where KVM fail to stop/reset counters
     and other state prior to refreshing the vPMU model.

   - Fix a double-overflow PMU bug by tracking emulated counter events
     using a dedicated field instead of snapshotting the "previous"
     counter. If the hardware PMC count triggers overflow that is
     recognized in the same VM-Exit that KVM manually bumps an event
     count, KVM would pend PMIs for both the hardware-triggered overflow
     and for KVM-triggered overflow.

   - Turn off KVM_WERROR by default for all configs so that it's not
     inadvertantly enabled by non-KVM developers, which can be
     problematic for subsystems that require no regressions for W=1
     builds.

   - Advertise all of the host-supported CPUID bits that enumerate
     IA32_SPEC_CTRL "features".

   - Don't force a masterclock update when a vCPU synchronizes to the
     current TSC generation, as updating the masterclock can cause
     kvmclock's time to "jump" unexpectedly, e.g. when userspace
     hotplugs a pre-created vCPU.

   - Use RIP-relative address to read kvm_rebooting in the VM-Enter
     fault paths, partly as a super minor optimization, but mostly to
     make KVM play nice with position independent executable builds.

   - Guard KVM-on-HyperV's range-based TLB flush hooks with an #ifdef on
     CONFIG_HYPERV as a minor optimization, and to self-document the
     code.

   - Add CONFIG_KVM_HYPERV to allow disabling KVM support for HyperV
     "emulation" at build time.

  ARM64:

   - LPA2 support, adding 52bit IPA/PA capability for 4kB and 16kB base
     granule sizes. Branch shared with the arm64 tree.

   - Large Fine-Grained Trap rework, bringing some sanity to the
     feature, although there is more to come. This comes with a prefix
     branch shared with the arm64 tree.

   - Some additional Nested Virtualization groundwork, mostly
     introducing the NV2 VNCR support and retargetting the NV support to
     that version of the architecture.

   - A small set of vgic fixes and associated cleanups.

  Loongarch:

   - Optimization for memslot hugepage checking

   - Cleanup and fix some HW/SW timer issues

   - Add LSX/LASX (128bit/256bit SIMD) support

  RISC-V:

   - KVM_GET_REG_LIST improvement for vector registers

   - Generate ISA extension reg_list using macros in get-reg-list
     selftest

   - Support for reporting steal time along with selftest

  s390:

   - Bugfixes

  Selftests:

   - Fix an annoying goof where the NX hugepage test prints out garbage
     instead of the magic token needed to run the test.

   - Fix build errors when a header is delete/moved due to a missing
     flag in the Makefile.

   - Detect if KVM bugged/killed a selftest's VM and print out a helpful
     message instead of complaining that a random ioctl() failed.

   - Annotate the guest printf/assert helpers with __printf(), and fix
     the various bugs that were lurking due to lack of said annotation"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (185 commits)
  x86/kvm: Do not try to disable kvmclock if it was not enabled
  KVM: x86: add missing "depends on KVM"
  KVM: fix direction of dependency on MMU notifiers
  KVM: introduce CONFIG_KVM_COMMON
  KVM: arm64: Add missing memory barriers when switching to pKVM's hyp pgd
  KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache
  RISC-V: KVM: selftests: Add get-reg-list test for STA registers
  RISC-V: KVM: selftests: Add steal_time test support
  RISC-V: KVM: selftests: Add guest_sbi_probe_extension
  RISC-V: KVM: selftests: Move sbi_ecall to processor.c
  RISC-V: KVM: Implement SBI STA extension
  RISC-V: KVM: Add support for SBI STA registers
  RISC-V: KVM: Add support for SBI extension registers
  RISC-V: KVM: Add SBI STA info to vcpu_arch
  RISC-V: KVM: Add steal-update vcpu request
  RISC-V: KVM: Add SBI STA extension skeleton
  RISC-V: paravirt: Implement steal-time support
  RISC-V: Add SBI STA extension definitions
  RISC-V: paravirt: Add skeleton for pv-time support
  RISC-V: KVM: Fix indentation in kvm_riscv_vcpu_set_reg_csr()
  ...
This commit is contained in:
Linus Torvalds 2024-01-17 13:03:37 -08:00
commit 09d1c6a80f
187 changed files with 7478 additions and 2719 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3996,9 +3996,9 @@
vulnerability. System may allow data leaks with this
option.
no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
steal time accounting. steal time is computed, but
won't influence scheduler behaviour
no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV] Disable
paravirtualized steal time accounting. steal time is
computed, but won't influence scheduler behaviour
nosync [HW,M68K] Disables sync negotiation for all devices.

219
Documentation/virt/kvm/api.rst
View File

@ -147,10 +147,29 @@ described as 'basic' will be available.
The new VM has no virtual cpus and no memory.
You probably want to use 0 as machine type.
X86:
^^^^
Supported X86 VM types can be queried via KVM_CAP_VM_TYPES.
S390:
^^^^^
In order to create user controlled virtual machines on S390, check
KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as
privileged user (CAP_SYS_ADMIN).
MIPS:
^^^^^
To use hardware assisted virtualization on MIPS (VZ ASE) rather than
the default trap & emulate implementation (which changes the virtual
memory layout to fit in user mode), check KVM_CAP_MIPS_VZ and use the
flag KVM_VM_MIPS_VZ.
ARM64:
^^^^^^
On arm64, the physical address size for a VM (IPA Size limit) is limited
to 40bits by default. The limit can be configured if the host supports the
extension KVM_CAP_ARM_VM_IPA_SIZE. When supported, use
@ -608,18 +627,6 @@ interrupt number dequeues the interrupt.
This is an asynchronous vcpu ioctl and can be invoked from any thread.
4.17 KVM_DEBUG_GUEST
--------------------
:Capability: basic
:Architectures: none
:Type: vcpu ioctl
:Parameters: none)
:Returns: -1 on error
Support for this has been removed. Use KVM_SET_GUEST_DEBUG instead.
4.18 KVM_GET_MSRS
-----------------
@ -6192,6 +6199,130 @@ to know what fields can be changed for the system register described by
``op0, op1, crn, crm, op2``. KVM rejects ID register values that describe a
superset of the features supported by the system.
4.140 KVM_SET_USER_MEMORY_REGION2
---------------------------------
:Capability: KVM_CAP_USER_MEMORY2
:Architectures: all
:Type: vm ioctl
:Parameters: struct kvm_userspace_memory_region2 (in)
:Returns: 0 on success, -1 on error
KVM_SET_USER_MEMORY_REGION2 is an extension to KVM_SET_USER_MEMORY_REGION that
allows mapping guest_memfd memory into a guest. All fields shared with
KVM_SET_USER_MEMORY_REGION identically. Userspace can set KVM_MEM_GUEST_MEMFD
in flags to have KVM bind the memory region to a given guest_memfd range of
[guest_memfd_offset, guest_memfd_offset + memory_size]. The target guest_memfd
must point at a file created via KVM_CREATE_GUEST_MEMFD on the current VM, and
the target range must not be bound to any other memory region. All standard
bounds checks apply (use common sense).
::
struct kvm_userspace_memory_region2 {
__u32 slot;
__u32 flags;
__u64 guest_phys_addr;
__u64 memory_size; /* bytes */
__u64 userspace_addr; /* start of the userspace allocated memory */
__u64 guest_memfd_offset;
__u32 guest_memfd;
__u32 pad1;
__u64 pad2[14];
};
A KVM_MEM_GUEST_MEMFD region _must_ have a valid guest_memfd (private memory) and
userspace_addr (shared memory). However, "valid" for userspace_addr simply
means that the address itself must be a legal userspace address. The backing
mapping for userspace_addr is not required to be valid/populated at the time of
KVM_SET_USER_MEMORY_REGION2, e.g. shared memory can be lazily mapped/allocated
on-demand.
When mapping a gfn into the guest, KVM selects shared vs. private, i.e consumes
userspace_addr vs. guest_memfd, based on the gfn's KVM_MEMORY_ATTRIBUTE_PRIVATE
state. At VM creation time, all memory is shared, i.e. the PRIVATE attribute
is '0' for all gfns. Userspace can control whether memory is shared/private by
toggling KVM_MEMORY_ATTRIBUTE_PRIVATE via KVM_SET_MEMORY_ATTRIBUTES as needed.
4.141 KVM_SET_MEMORY_ATTRIBUTES
-------------------------------
:Capability: KVM_CAP_MEMORY_ATTRIBUTES
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_memory_attributes (in)
:Returns: 0 on success, <0 on error
KVM_SET_MEMORY_ATTRIBUTES allows userspace to set memory attributes for a range
of guest physical memory.
::
struct kvm_memory_attributes {
__u64 address;
__u64 size;
__u64 attributes;
__u64 flags;
};
#define KVM_MEMORY_ATTRIBUTE_PRIVATE (1ULL << 3)
The address and size must be page aligned. The supported attributes can be
retrieved via ioctl(KVM_CHECK_EXTENSION) on KVM_CAP_MEMORY_ATTRIBUTES. If
executed on a VM, KVM_CAP_MEMORY_ATTRIBUTES precisely returns the attributes
supported by that VM. If executed at system scope, KVM_CAP_MEMORY_ATTRIBUTES
returns all attributes supported by KVM. The only attribute defined at this
time is KVM_MEMORY_ATTRIBUTE_PRIVATE, which marks the associated gfn as being
guest private memory.
Note, there is no "get" API. Userspace is responsible for explicitly tracking
the state of a gfn/page as needed.
The "flags" field is reserved for future extensions and must be '0'.
4.142 KVM_CREATE_GUEST_MEMFD
----------------------------
:Capability: KVM_CAP_GUEST_MEMFD
:Architectures: none
:Type: vm ioctl
:Parameters: struct kvm_create_guest_memfd(in)
:Returns: 0 on success, <0 on error
KVM_CREATE_GUEST_MEMFD creates an anonymous file and returns a file descriptor
that refers to it. guest_memfd files are roughly analogous to files created
via memfd_create(), e.g. guest_memfd files live in RAM, have volatile storage,
and are automatically released when the last reference is dropped. Unlike
"regular" memfd_create() files, guest_memfd files are bound to their owning
virtual machine (see below), cannot be mapped, read, or written by userspace,
and cannot be resized (guest_memfd files do however support PUNCH_HOLE).
::
struct kvm_create_guest_memfd {
__u64 size;
__u64 flags;
__u64 reserved[6];
};
Conceptually, the inode backing a guest_memfd file represents physical memory,
i.e. is coupled to the virtual machine as a thing, not to a "struct kvm". The
file itself, which is bound to a "struct kvm", is that instance's view of the
underlying memory, e.g. effectively provides the translation of guest addresses
to host memory. This allows for use cases where multiple KVM structures are
used to manage a single virtual machine, e.g. when performing intrahost
migration of a virtual machine.
KVM currently only supports mapping guest_memfd via KVM_SET_USER_MEMORY_REGION2,
and more specifically via the guest_memfd and guest_memfd_offset fields in
"struct kvm_userspace_memory_region2", where guest_memfd_offset is the offset
into the guest_memfd instance. For a given guest_memfd file, there can be at
most one mapping per page, i.e. binding multiple memory regions to a single
guest_memfd range is not allowed (any number of memory regions can be bound to
a single guest_memfd file, but the bound ranges must not overlap).
See KVM_SET_USER_MEMORY_REGION2 for additional details.
5. The kvm_run structure
========================
@ -6824,6 +6955,30 @@ array field represents return values. The userspace should update the return
values of SBI call before resuming the VCPU. For more details on RISC-V SBI
spec refer, https://github.com/riscv/riscv-sbi-doc.
::
/* KVM_EXIT_MEMORY_FAULT */
struct {
#define KVM_MEMORY_EXIT_FLAG_PRIVATE (1ULL << 3)
__u64 flags;
__u64 gpa;
__u64 size;
} memory_fault;
KVM_EXIT_MEMORY_FAULT indicates the vCPU has encountered a memory fault that
could not be resolved by KVM. The 'gpa' and 'size' (in bytes) describe the
guest physical address range [gpa, gpa + size) of the fault. The 'flags' field
describes properties of the faulting access that are likely pertinent:
- KVM_MEMORY_EXIT_FLAG_PRIVATE - When set, indicates the memory fault occurred
on a private memory access. When clear, indicates the fault occurred on a
shared access.
Note! KVM_EXIT_MEMORY_FAULT is unique among all KVM exit reasons in that it
accompanies a return code of '-1', not '0'! errno will always be set to EFAULT
or EHWPOISON when KVM exits with KVM_EXIT_MEMORY_FAULT, userspace should assume
kvm_run.exit_reason is stale/undefined for all other error numbers.
::
/* KVM_EXIT_NOTIFY */
@ -7858,6 +8013,27 @@ This capability is aimed to mitigate the threat that malicious VMs can
cause CPU stuck (due to event windows don't open up) and make the CPU
unavailable to host or other VMs.
7.34 KVM_CAP_MEMORY_FAULT_INFO
------------------------------
:Architectures: x86
:Returns: Informational only, -EINVAL on direct KVM_ENABLE_CAP.
The presence of this capability indicates that KVM_RUN will fill
kvm_run.memory_fault if KVM cannot resolve a guest page fault VM-Exit, e.g. if
there is a valid memslot but no backing VMA for the corresponding host virtual
address.
The information in kvm_run.memory_fault is valid if and only if KVM_RUN returns
an error with errno=EFAULT or errno=EHWPOISON *and* kvm_run.exit_reason is set
to KVM_EXIT_MEMORY_FAULT.
Note: Userspaces which attempt to resolve memory faults so that they can retry
KVM_RUN are encouraged to guard against repeatedly receiving the same
error/annotated fault.
See KVM_EXIT_MEMORY_FAULT for more information.
8. Other capabilities.
======================
@ -8374,6 +8550,7 @@ PVHVM guests. Valid flags are::
#define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4)
#define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5)
#define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6)
#define KVM_XEN_HVM_CONFIG_PVCLOCK_TSC_UNSTABLE (1 << 7)
The KVM_XEN_HVM_CONFIG_HYPERCALL_MSR flag indicates that the KVM_XEN_HVM_CONFIG
ioctl is available, for the guest to set its hypercall page.
@ -8417,6 +8594,11 @@ behave more correctly, not using the XEN_RUNSTATE_UPDATE flag until/unless
specifically enabled (by the guest making the hypercall, causing the VMM
to enable the KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG attribute).
The KVM_XEN_HVM_CONFIG_PVCLOCK_TSC_UNSTABLE flag indicates that KVM supports
clearing the PVCLOCK_TSC_STABLE_BIT flag in Xen pvclock sources. This will be
done when the KVM_CAP_XEN_HVM ioctl sets the
KVM_XEN_HVM_CONFIG_PVCLOCK_TSC_UNSTABLE flag.
8.31 KVM_CAP_PPC_MULTITCE
-------------------------
@ -8596,6 +8778,19 @@ block sizes is exposed in KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES as a
64-bit bitmap (each bit describing a block size). The default value is
0, to disable the eager page splitting.
8.41 KVM_CAP_VM_TYPES
---------------------
:Capability: KVM_CAP_MEMORY_ATTRIBUTES
:Architectures: x86
:Type: system ioctl
This capability returns a bitmap of support VM types. The 1-setting of bit @n
means the VM type with value @n is supported. Possible values of @n are::
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_SW_PROTECTED_VM 1
9. Known KVM API problems
=========================

7
Documentation/virt/kvm/locking.rst
View File

@ -43,10 +43,9 @@ On x86:
- vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock and kvm->arch.xen.xen_lock
- kvm->arch.mmu_lock is an rwlock. kvm->arch.tdp_mmu_pages_lock and
kvm->arch.mmu_unsync_pages_lock are taken inside kvm->arch.mmu_lock, and
cannot be taken without already holding kvm->arch.mmu_lock (typically with
``read_lock`` for the TDP MMU, thus the need for additional spinlocks).
- kvm->arch.mmu_lock is an rwlock; critical sections for
kvm->arch.tdp_mmu_pages_lock and kvm->arch.mmu_unsync_pages_lock must
also take kvm->arch.mmu_lock
Everything else is a leaf: no other lock is taken inside the critical
sections.

15
arch/arm64/include/asm/esr.h
View File

@ -392,6 +392,21 @@ static inline bool esr_is_data_abort(unsigned long esr)
return ec == ESR_ELx_EC_DABT_LOW || ec == ESR_ELx_EC_DABT_CUR;
}
static inline bool esr_fsc_is_translation_fault(unsigned long esr)
{
return (esr & ESR_ELx_FSC_TYPE) == ESR_ELx_FSC_FAULT;
}
static inline bool esr_fsc_is_permission_fault(unsigned long esr)
{
return (esr & ESR_ELx_FSC_TYPE) == ESR_ELx_FSC_PERM;
}
static inline bool esr_fsc_is_access_flag_fault(unsigned long esr)
{
return (esr & ESR_ELx_FSC_TYPE) == ESR_ELx_FSC_ACCESS;
}
const char *esr_get_class_string(unsigned long esr);
#endif /* __ASSEMBLY */

55
arch/arm64/include/asm/kvm_arm.h
View File

@ -108,6 +108,7 @@
#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En)
/* TCR_EL2 Registers bits */
#define TCR_EL2_DS (1UL << 32)
#define TCR_EL2_RES1 ((1U << 31) | (1 << 23))
#define TCR_EL2_TBI (1 << 20)
#define TCR_EL2_PS_SHIFT 16
@ -122,6 +123,7 @@
TCR_EL2_ORGN0_MASK | TCR_EL2_IRGN0_MASK | TCR_EL2_T0SZ_MASK)
/* VTCR_EL2 Registers bits */
#define VTCR_EL2_DS TCR_EL2_DS
#define VTCR_EL2_RES1 (1U << 31)
#define VTCR_EL2_HD (1 << 22)
#define VTCR_EL2_HA (1 << 21)
@ -344,36 +346,47 @@
* Once we get to a point where the two describe the same thing, we'll
* merge the definitions. One day.
*/
#define __HFGRTR_EL2_RES0 (GENMASK(63, 56) | GENMASK(53, 51))
#define __HFGRTR_EL2_RES0 HFGxTR_EL2_RES0
#define __HFGRTR_EL2_MASK GENMASK(49, 0)
#define __HFGRTR_EL2_nMASK (GENMASK(58, 57) | GENMASK(55, 54) | BIT(50))
#define __HFGRTR_EL2_nMASK ~(__HFGRTR_EL2_RES0 | __HFGRTR_EL2_MASK)
#define __HFGWTR_EL2_RES0 (GENMASK(63, 56) | GENMASK(53, 51) | \
BIT(46) | BIT(42) | BIT(40) | BIT(28) | \
/*
* The HFGWTR bits are a subset of HFGRTR bits. To ensure we don't miss any
* future additions, define __HFGWTR* macros relative to __HFGRTR* ones.
*/
#define __HFGRTR_ONLY_MASK (BIT(46) | BIT(42) | BIT(40) | BIT(28) | \
GENMASK(26, 25) | BIT(21) | BIT(18) | \
GENMASK(15, 14) | GENMASK(10, 9) | BIT(2))
#define __HFGWTR_EL2_MASK GENMASK(49, 0)
#define __HFGWTR_EL2_nMASK (GENMASK(58, 57) | GENMASK(55, 54) | BIT(50))
#define __HFGWTR_EL2_RES0 (__HFGRTR_EL2_RES0 | __HFGRTR_ONLY_MASK)
#define __HFGWTR_EL2_MASK (__HFGRTR_EL2_MASK & ~__HFGRTR_ONLY_MASK)
#define __HFGWTR_EL2_nMASK ~(__HFGWTR_EL2_RES0 | __HFGWTR_EL2_MASK)
#define __HFGITR_EL2_RES0 GENMASK(63, 57)
#define __HFGITR_EL2_MASK GENMASK(54, 0)
#define __HFGITR_EL2_nMASK GENMASK(56, 55)
#define __HFGITR_EL2_RES0 HFGITR_EL2_RES0
#define __HFGITR_EL2_MASK (BIT(62) | BIT(60) | GENMASK(54, 0))
#define __HFGITR_EL2_nMASK ~(__HFGITR_EL2_RES0 | __HFGITR_EL2_MASK)
#define __HDFGRTR_EL2_RES0 (BIT(49) | BIT(42) | GENMASK(39, 38) | \
GENMASK(21, 20) | BIT(8))
#define __HDFGRTR_EL2_MASK ~__HDFGRTR_EL2_nMASK
#define __HDFGRTR_EL2_nMASK GENMASK(62, 59)
#define __HDFGRTR_EL2_RES0 HDFGRTR_EL2_RES0
#define __HDFGRTR_EL2_MASK (BIT(63) | GENMASK(58, 50) | GENMASK(48, 43) | \
GENMASK(41, 40) | GENMASK(37, 22) | \
GENMASK(19, 9) | GENMASK(7, 0))
#define __HDFGRTR_EL2_nMASK ~(__HDFGRTR_EL2_RES0 | __HDFGRTR_EL2_MASK)
#define __HDFGWTR_EL2_RES0 (BIT(63) | GENMASK(59, 58) | BIT(51) | BIT(47) | \
BIT(43) | GENMASK(40, 38) | BIT(34) | BIT(30) | \
BIT(22) | BIT(9) | BIT(6))
#define __HDFGWTR_EL2_MASK ~__HDFGWTR_EL2_nMASK
#define __HDFGWTR_EL2_nMASK GENMASK(62, 60)
#define __HDFGWTR_EL2_RES0 HDFGWTR_EL2_RES0
#define __HDFGWTR_EL2_MASK (GENMASK(57, 52) | GENMASK(50, 48) | \
GENMASK(46, 44) | GENMASK(42, 41) | \
GENMASK(37, 35) | GENMASK(33, 31) | \
GENMASK(29, 23) | GENMASK(21, 10) | \
GENMASK(8, 7) | GENMASK(5, 0))
#define __HDFGWTR_EL2_nMASK ~(__HDFGWTR_EL2_RES0 | __HDFGWTR_EL2_MASK)
#define __HAFGRTR_EL2_RES0 HAFGRTR_EL2_RES0
#define __HAFGRTR_EL2_MASK (GENMASK(49, 17) | GENMASK(4, 0))
#define __HAFGRTR_EL2_nMASK ~(__HAFGRTR_EL2_RES0 | __HAFGRTR_EL2_MASK)
/* Similar definitions for HCRX_EL2 */
#define __HCRX_EL2_RES0 (GENMASK(63, 16) | GENMASK(13, 12))
#define __HCRX_EL2_MASK (0)
#define __HCRX_EL2_nMASK (GENMASK(15, 14) | GENMASK(4, 0))
#define __HCRX_EL2_RES0 HCRX_EL2_RES0
#define __HCRX_EL2_MASK (BIT(6))
#define __HCRX_EL2_nMASK ~(__HCRX_EL2_RES0 | __HCRX_EL2_MASK)
/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
#define HPFAR_MASK (~UL(0xf))

34
arch/arm64/include/asm/kvm_emulate.h
View File

@ -17,6 +17,7 @@
#include <asm/esr.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_nested.h>
#include <asm/ptrace.h>
#include <asm/cputype.h>
#include <asm/virt.h>
@ -54,11 +55,6 @@ void kvm_emulate_nested_eret(struct kvm_vcpu *vcpu);
int kvm_inject_nested_sync(struct kvm_vcpu *vcpu, u64 esr_el2);
int kvm_inject_nested_irq(struct kvm_vcpu *vcpu);
static inline bool vcpu_has_feature(const struct kvm_vcpu *vcpu, int feature)
{
return test_bit(feature, vcpu->kvm->arch.vcpu_features);
}
#if defined(__KVM_VHE_HYPERVISOR__) || defined(__KVM_NVHE_HYPERVISOR__)
static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
{
@ -248,7 +244,7 @@ static inline bool __is_hyp_ctxt(const struct kvm_cpu_context *ctxt)
static inline bool is_hyp_ctxt(const struct kvm_vcpu *vcpu)
{
return __is_hyp_ctxt(&vcpu->arch.ctxt);
return vcpu_has_nv(vcpu) && __is_hyp_ctxt(&vcpu->arch.ctxt);
}
/*
@ -404,14 +400,25 @@ static __always_inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC;
}
static __always_inline u8 kvm_vcpu_trap_get_fault_type(const struct kvm_vcpu *vcpu)
static inline
bool kvm_vcpu_trap_is_permission_fault(const struct kvm_vcpu *vcpu)
{
return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_TYPE;
return esr_fsc_is_permission_fault(kvm_vcpu_get_esr(vcpu));
}
static __always_inline u8 kvm_vcpu_trap_get_fault_level(const struct kvm_vcpu *vcpu)
static inline
bool kvm_vcpu_trap_is_translation_fault(const struct kvm_vcpu *vcpu)
{
return kvm_vcpu_get_esr(vcpu) & ESR_ELx_FSC_LEVEL;
return esr_fsc_is_translation_fault(kvm_vcpu_get_esr(vcpu));
}
static inline
u64 kvm_vcpu_trap_get_perm_fault_granule(const struct kvm_vcpu *vcpu)
{
unsigned long esr = kvm_vcpu_get_esr(vcpu);
BUG_ON(!esr_fsc_is_permission_fault(esr));
return BIT(ARM64_HW_PGTABLE_LEVEL_SHIFT(esr & ESR_ELx_FSC_LEVEL));
}
static __always_inline bool kvm_vcpu_abt_issea(const struct kvm_vcpu *vcpu)
@ -454,12 +461,7 @@ static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
* first), then a permission fault to allow the flags
* to be set.
*/
switch (kvm_vcpu_trap_get_fault_type(vcpu)) {
case ESR_ELx_FSC_PERM:
return true;
default:
return false;
}
return kvm_vcpu_trap_is_permission_fault(vcpu);
}
if (kvm_vcpu_trap_is_iabt(vcpu))

140
arch/arm64/include/asm/kvm_host.h
View File

@ -27,6 +27,7 @@
#include <asm/fpsimd.h>
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/vncr_mapping.h>
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
@ -306,6 +307,7 @@ struct kvm_arch {
* Atomic access to multiple idregs are guarded by kvm_arch.config_lock.
*/
#define IDREG_IDX(id) (((sys_reg_CRm(id) - 1) << 3) | sys_reg_Op2(id))
#define IDX_IDREG(idx) sys_reg(3, 0, 0, ((idx) >> 3) + 1, (idx) & Op2_mask)
#define IDREG(kvm, id) ((kvm)->arch.id_regs[IDREG_IDX(id)])
#define KVM_ARM_ID_REG_NUM (IDREG_IDX(sys_reg(3, 0, 0, 7, 7)) + 1)
u64 id_regs[KVM_ARM_ID_REG_NUM];
@ -324,33 +326,33 @@ struct kvm_vcpu_fault_info {
u64 disr_el1; /* Deferred [SError] Status Register */
};
/*
* VNCR() just places the VNCR_capable registers in the enum after
* __VNCR_START__, and the value (after correction) to be an 8-byte offset
* from the VNCR base. As we don't require the enum to be otherwise ordered,
* we need the terrible hack below to ensure that we correctly size the
* sys_regs array, no matter what.
*
* The __MAX__ macro has been lifted from Sean Eron Anderson's wonderful
* treasure trove of bit hacks:
* https://graphics.stanford.edu/~seander/bithacks.html#IntegerMinOrMax
*/
#define __MAX__(x,y) ((x) ^ (((x) ^ (y)) & -((x) < (y))))
#define VNCR(r) \
__before_##r, \
r = __VNCR_START__ + ((VNCR_ ## r) / 8), \
__after_##r = __MAX__(__before_##r - 1, r)
enum vcpu_sysreg {
__INVALID_SYSREG__, /* 0 is reserved as an invalid value */
MPIDR_EL1, /* MultiProcessor Affinity Register */
CLIDR_EL1, /* Cache Level ID Register */
CSSELR_EL1, /* Cache Size Selection Register */
SCTLR_EL1, /* System Control Register */
ACTLR_EL1, /* Auxiliary Control Register */
CPACR_EL1, /* Coprocessor Access Control */
ZCR_EL1, /* SVE Control */
TTBR0_EL1, /* Translation Table Base Register 0 */
TTBR1_EL1, /* Translation Table Base Register 1 */
TCR_EL1, /* Translation Control Register */
TCR2_EL1, /* Extended Translation Control Register */
ESR_EL1, /* Exception Syndrome Register */
AFSR0_EL1, /* Auxiliary Fault Status Register 0 */
AFSR1_EL1, /* Auxiliary Fault Status Register 1 */
FAR_EL1, /* Fault Address Register */
MAIR_EL1, /* Memory Attribute Indirection Register */
VBAR_EL1, /* Vector Base Address Register */
CONTEXTIDR_EL1, /* Context ID Register */
TPIDR_EL0, /* Thread ID, User R/W */
TPIDRRO_EL0, /* Thread ID, User R/O */
TPIDR_EL1, /* Thread ID, Privileged */
AMAIR_EL1, /* Aux Memory Attribute Indirection Register */
CNTKCTL_EL1, /* Timer Control Register (EL1) */
PAR_EL1, /* Physical Address Register */
MDSCR_EL1, /* Monitor Debug System Control Register */
MDCCINT_EL1, /* Monitor Debug Comms Channel Interrupt Enable Reg */
OSLSR_EL1, /* OS Lock Status Register */
DISR_EL1, /* Deferred Interrupt Status Register */
@ -381,26 +383,11 @@ enum vcpu_sysreg {
APGAKEYLO_EL1,
APGAKEYHI_EL1,
ELR_EL1,
SP_EL1,
SPSR_EL1,
CNTVOFF_EL2,
CNTV_CVAL_EL0,
CNTV_CTL_EL0,
CNTP_CVAL_EL0,
CNTP_CTL_EL0,
/* Memory Tagging Extension registers */
RGSR_EL1, /* Random Allocation Tag Seed Register */
GCR_EL1, /* Tag Control Register */
TFSR_EL1, /* Tag Fault Status Register (EL1) */
TFSRE0_EL1, /* Tag Fault Status Register (EL0) */
/* Permission Indirection Extension registers */
PIR_EL1, /* Permission Indirection Register 1 (EL1) */
PIRE0_EL1, /* Permission Indirection Register 0 (EL1) */
/* 32bit specific registers. */
DACR32_EL2, /* Domain Access Control Register */
IFSR32_EL2, /* Instruction Fault Status Register */
@ -408,21 +395,14 @@ enum vcpu_sysreg {
DBGVCR32_EL2, /* Debug Vector Catch Register */
/* EL2 registers */
VPIDR_EL2, /* Virtualization Processor ID Register */
VMPIDR_EL2, /* Virtualization Multiprocessor ID Register */
SCTLR_EL2, /* System Control Register (EL2) */
ACTLR_EL2, /* Auxiliary Control Register (EL2) */
HCR_EL2, /* Hypervisor Configuration Register */
MDCR_EL2, /* Monitor Debug Configuration Register (EL2) */
CPTR_EL2, /* Architectural Feature Trap Register (EL2) */
HSTR_EL2, /* Hypervisor System Trap Register */
HACR_EL2, /* Hypervisor Auxiliary Control Register */
HCRX_EL2, /* Extended Hypervisor Configuration Register */
TTBR0_EL2, /* Translation Table Base Register 0 (EL2) */
TTBR1_EL2, /* Translation Table Base Register 1 (EL2) */
TCR_EL2, /* Translation Control Register (EL2) */
VTTBR_EL2, /* Virtualization Translation Table Base Register */
VTCR_EL2, /* Virtualization Translation Control Register */
SPSR_EL2, /* EL2 saved program status register */
ELR_EL2, /* EL2 exception link register */
AFSR0_EL2, /* Auxiliary Fault Status Register 0 (EL2) */
@ -435,19 +415,62 @@ enum vcpu_sysreg {
VBAR_EL2, /* Vector Base Address Register (EL2) */
RVBAR_EL2, /* Reset Vector Base Address Register */
CONTEXTIDR_EL2, /* Context ID Register (EL2) */
TPIDR_EL2, /* EL2 Software Thread ID Register */
CNTHCTL_EL2, /* Counter-timer Hypervisor Control register */
SP_EL2, /* EL2 Stack Pointer */
HFGRTR_EL2,
HFGWTR_EL2,
HFGITR_EL2,
HDFGRTR_EL2,
HDFGWTR_EL2,
CNTHP_CTL_EL2,
CNTHP_CVAL_EL2,
CNTHV_CTL_EL2,
CNTHV_CVAL_EL2,
__VNCR_START__, /* Any VNCR-capable reg goes after this point */
VNCR(SCTLR_EL1),/* System Control Register */
VNCR(ACTLR_EL1),/* Auxiliary Control Register */
VNCR(CPACR_EL1),/* Coprocessor Access Control */
VNCR(ZCR_EL1), /* SVE Control */
VNCR(TTBR0_EL1),/* Translation Table Base Register 0 */
VNCR(TTBR1_EL1),/* Translation Table Base Register 1 */
VNCR(TCR_EL1), /* Translation Control Register */
VNCR(TCR2_EL1), /* Extended Translation Control Register */
VNCR(ESR_EL1), /* Exception Syndrome Register */
VNCR(AFSR0_EL1),/* Auxiliary Fault Status Register 0 */
VNCR(AFSR1_EL1),/* Auxiliary Fault Status Register 1 */
VNCR(FAR_EL1), /* Fault Address Register */
VNCR(MAIR_EL1), /* Memory Attribute Indirection Register */
VNCR(VBAR_EL1), /* Vector Base Address Register */
VNCR(CONTEXTIDR_EL1), /* Context ID Register */
VNCR(AMAIR_EL1),/* Aux Memory Attribute Indirection Register */
VNCR(MDSCR_EL1),/* Monitor Debug System Control Register */
VNCR(ELR_EL1),
VNCR(SP_EL1),
VNCR(SPSR_EL1),
VNCR(TFSR_EL1), /* Tag Fault Status Register (EL1) */
VNCR(VPIDR_EL2),/* Virtualization Processor ID Register */
VNCR(VMPIDR_EL2),/* Virtualization Multiprocessor ID Register */
VNCR(HCR_EL2), /* Hypervisor Configuration Register */
VNCR(HSTR_EL2), /* Hypervisor System Trap Register */
VNCR(VTTBR_EL2),/* Virtualization Translation Table Base Register */
VNCR(VTCR_EL2), /* Virtualization Translation Control Register */
VNCR(TPIDR_EL2),/* EL2 Software Thread ID Register */
VNCR(HCRX_EL2), /* Extended Hypervisor Configuration Register */
/* Permission Indirection Extension registers */
VNCR(PIR_EL1), /* Permission Indirection Register 1 (EL1) */
VNCR(PIRE0_EL1), /* Permission Indirection Register 0 (EL1) */
VNCR(HFGRTR_EL2),
VNCR(HFGWTR_EL2),
VNCR(HFGITR_EL2),
VNCR(HDFGRTR_EL2),
VNCR(HDFGWTR_EL2),
VNCR(HAFGRTR_EL2),
VNCR(CNTVOFF_EL2),
VNCR(CNTV_CVAL_EL0),
VNCR(CNTV_CTL_EL0),
VNCR(CNTP_CVAL_EL0),
VNCR(CNTP_CTL_EL0),
NR_SYS_REGS /* Nothing after this line! */
};
@ -464,6 +487,9 @@ struct kvm_cpu_context {
u64 sys_regs[NR_SYS_REGS];
struct kvm_vcpu *__hyp_running_vcpu;
/* This pointer has to be 4kB aligned. */
u64 *vncr_array;
};
struct kvm_host_data {
@ -826,8 +852,19 @@ struct kvm_vcpu_arch {
* accessed by a running VCPU. For example, for userspace access or
* for system registers that are never context switched, but only
* emulated.
*
* Don't bother with VNCR-based accesses in the nVHE code, it has no
* business dealing with NV.
*/
#define __ctxt_sys_reg(c,r) (&(c)->sys_regs[(r)])
static inline u64 *__ctxt_sys_reg(const struct kvm_cpu_context *ctxt, int r)
{
#if !defined (__KVM_NVHE_HYPERVISOR__)
if (unlikely(cpus_have_final_cap(ARM64_HAS_NESTED_VIRT) &&
r >= __VNCR_START__ && ctxt->vncr_array))
return &ctxt->vncr_array[r - __VNCR_START__];
#endif
return (u64 *)&ctxt->sys_regs[r];
}
#define ctxt_sys_reg(c,r) (*__ctxt_sys_reg(c,r))
@ -871,6 +908,7 @@ static inline bool __vcpu_read_sys_reg_from_cpu(int reg, u64 *val)
case AMAIR_EL1: *val = read_sysreg_s(SYS_AMAIR_EL12); break;
case CNTKCTL_EL1: *val = read_sysreg_s(SYS_CNTKCTL_EL12); break;
case ELR_EL1: *val = read_sysreg_s(SYS_ELR_EL12); break;
case SPSR_EL1: *val = read_sysreg_s(SYS_SPSR_EL12); break;
case PAR_EL1: *val = read_sysreg_par(); break;
case DACR32_EL2: *val = read_sysreg_s(SYS_DACR32_EL2); break;
case IFSR32_EL2: *val = read_sysreg_s(SYS_IFSR32_EL2); break;
@ -915,6 +953,7 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
case AMAIR_EL1: write_sysreg_s(val, SYS_AMAIR_EL12); break;
case CNTKCTL_EL1: write_sysreg_s(val, SYS_CNTKCTL_EL12); break;
case ELR_EL1: write_sysreg_s(val, SYS_ELR_EL12); break;
case SPSR_EL1: write_sysreg_s(val, SYS_SPSR_EL12); break;
case PAR_EL1: write_sysreg_s(val, SYS_PAR_EL1); break;
case DACR32_EL2: write_sysreg_s(val, SYS_DACR32_EL2); break;
case IFSR32_EL2: write_sysreg_s(val, SYS_IFSR32_EL2); break;
@ -954,8 +993,6 @@ int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events);
#define KVM_ARCH_WANT_MMU_NOTIFIER
void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);
@ -1177,6 +1214,13 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
#define kvm_vm_has_ran_once(kvm) \
(test_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &(kvm)->arch.flags))
static inline bool __vcpu_has_feature(const struct kvm_arch *ka, int feature)
{
return test_bit(feature, ka->vcpu_features);
}
#define vcpu_has_feature(v, f) __vcpu_has_feature(&(v)->kvm->arch, (f))
int kvm_trng_call(struct kvm_vcpu *vcpu);
#ifdef CONFIG_KVM
extern phys_addr_t hyp_mem_base;

56
arch/arm64/include/asm/kvm_nested.h
View File

@ -2,8 +2,9 @@
#ifndef __ARM64_KVM_NESTED_H
#define __ARM64_KVM_NESTED_H
#include <asm/kvm_emulate.h>
#include <linux/bitfield.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
{
@ -12,12 +13,55 @@ static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu)
vcpu_has_feature(vcpu, KVM_ARM_VCPU_HAS_EL2));
}
/* Translation helpers from non-VHE EL2 to EL1 */
static inline u64 tcr_el2_ps_to_tcr_el1_ips(u64 tcr_el2)
{
return (u64)FIELD_GET(TCR_EL2_PS_MASK, tcr_el2) << TCR_IPS_SHIFT;
}
static inline u64 translate_tcr_el2_to_tcr_el1(u64 tcr)
{
return TCR_EPD1_MASK | /* disable TTBR1_EL1 */
((tcr & TCR_EL2_TBI) ? TCR_TBI0 : 0) |
tcr_el2_ps_to_tcr_el1_ips(tcr) |
(tcr & TCR_EL2_TG0_MASK) |
(tcr & TCR_EL2_ORGN0_MASK) |
(tcr & TCR_EL2_IRGN0_MASK) |
(tcr & TCR_EL2_T0SZ_MASK);
}
static inline u64 translate_cptr_el2_to_cpacr_el1(u64 cptr_el2)
{
u64 cpacr_el1 = 0;
if (cptr_el2 & CPTR_EL2_TTA)
cpacr_el1 |= CPACR_ELx_TTA;
if (!(cptr_el2 & CPTR_EL2_TFP))
cpacr_el1 |= CPACR_ELx_FPEN;
if (!(cptr_el2 & CPTR_EL2_TZ))
cpacr_el1 |= CPACR_ELx_ZEN;
return cpacr_el1;
}
static inline u64 translate_sctlr_el2_to_sctlr_el1(u64 val)
{
/* Only preserve the minimal set of bits we support */
val &= (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | SCTLR_ELx_SA |
SCTLR_ELx_I | SCTLR_ELx_IESB | SCTLR_ELx_WXN | SCTLR_ELx_EE);
val |= SCTLR_EL1_RES1;
return val;
}
static inline u64 translate_ttbr0_el2_to_ttbr0_el1(u64 ttbr0)
{
/* Clear the ASID field */
return ttbr0 & ~GENMASK_ULL(63, 48);
}
extern bool __check_nv_sr_forward(struct kvm_vcpu *vcpu);
struct sys_reg_params;
struct sys_reg_desc;
void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p,
const struct sys_reg_desc *r);
int kvm_init_nv_sysregs(struct kvm *kvm);
#endif /* __ARM64_KVM_NESTED_H */

66
arch/arm64/include/asm/kvm_pgtable.h
View File

@ -11,7 +11,8 @@
#include <linux/kvm_host.h>
#include <linux/types.h>
#define KVM_PGTABLE_MAX_LEVELS 4U
#define KVM_PGTABLE_FIRST_LEVEL -1
#define KVM_PGTABLE_LAST_LEVEL 3
/*
* The largest supported block sizes for KVM (no 52-bit PA support):
@ -20,19 +21,29 @@
* - 64K (level 2): 512MB
*/
#ifdef CONFIG_ARM64_4K_PAGES
#define KVM_PGTABLE_MIN_BLOCK_LEVEL 1U
#define KVM_PGTABLE_MIN_BLOCK_LEVEL 1
#else
#define KVM_PGTABLE_MIN_BLOCK_LEVEL 2U
#define KVM_PGTABLE_MIN_BLOCK_LEVEL 2
#endif
#define kvm_lpa2_is_enabled() false
#define kvm_lpa2_is_enabled() system_supports_lpa2()
static inline u64 kvm_get_parange_max(void)
{
if (kvm_lpa2_is_enabled() ||
(IS_ENABLED(CONFIG_ARM64_PA_BITS_52) && PAGE_SHIFT == 16))
return ID_AA64MMFR0_EL1_PARANGE_52;
else
return ID_AA64MMFR0_EL1_PARANGE_48;
}
static inline u64 kvm_get_parange(u64 mmfr0)
{
u64 parange_max = kvm_get_parange_max();
u64 parange = cpuid_feature_extract_unsigned_field(mmfr0,
ID_AA64MMFR0_EL1_PARANGE_SHIFT);
if (parange > ID_AA64MMFR0_EL1_PARANGE_MAX)
parange = ID_AA64MMFR0_EL1_PARANGE_MAX;
if (parange > parange_max)
parange = parange_max;
return parange;
}
@ -43,6 +54,8 @@ typedef u64 kvm_pte_t;
#define KVM_PTE_ADDR_MASK GENMASK(47, PAGE_SHIFT)
#define KVM_PTE_ADDR_51_48 GENMASK(15, 12)
#define KVM_PTE_ADDR_MASK_LPA2 GENMASK(49, PAGE_SHIFT)
#define KVM_PTE_ADDR_51_50_LPA2 GENMASK(9, 8)
#define KVM_PHYS_INVALID (-1ULL)
@ -53,22 +66,35 @@ static inline bool kvm_pte_valid(kvm_pte_t pte)
static inline u64 kvm_pte_to_phys(kvm_pte_t pte)
{
u64 pa = pte & KVM_PTE_ADDR_MASK;
u64 pa;
if (kvm_lpa2_is_enabled()) {
pa = pte & KVM_PTE_ADDR_MASK_LPA2;
pa |= FIELD_GET(KVM_PTE_ADDR_51_50_LPA2, pte) << 50;
} else {
pa = pte & KVM_PTE_ADDR_MASK;
if (PAGE_SHIFT == 16)
pa |= FIELD_GET(KVM_PTE_ADDR_51_48, pte) << 48;
}
return pa;
}
static inline kvm_pte_t kvm_phys_to_pte(u64 pa)
{
kvm_pte_t pte = pa & KVM_PTE_ADDR_MASK;
kvm_pte_t pte;
if (kvm_lpa2_is_enabled()) {
pte = pa & KVM_PTE_ADDR_MASK_LPA2;
pa &= GENMASK(51, 50);
pte |= FIELD_PREP(KVM_PTE_ADDR_51_50_LPA2, pa >> 50);
} else {
pte = pa & KVM_PTE_ADDR_MASK;
if (PAGE_SHIFT == 16) {
pa &= GENMASK(51, 48);
pte |= FIELD_PREP(KVM_PTE_ADDR_51_48, pa >> 48);
}
}
return pte;
}
@ -78,28 +104,28 @@ static inline kvm_pfn_t kvm_pte_to_pfn(kvm_pte_t pte)
return __phys_to_pfn(kvm_pte_to_phys(pte));
}
static inline u64 kvm_granule_shift(u32 level)
static inline u64 kvm_granule_shift(s8 level)
{
/* Assumes KVM_PGTABLE_MAX_LEVELS is 4 */
/* Assumes KVM_PGTABLE_LAST_LEVEL is 3 */
return ARM64_HW_PGTABLE_LEVEL_SHIFT(level);
}
static inline u64 kvm_granule_size(u32 level)
static inline u64 kvm_granule_size(s8 level)
{
return BIT(kvm_granule_shift(level));
}
static inline bool kvm_level_supports_block_mapping(u32 level)
static inline bool kvm_level_supports_block_mapping(s8 level)
{
return level >= KVM_PGTABLE_MIN_BLOCK_LEVEL;
}
static inline u32 kvm_supported_block_sizes(void)
{
u32 level = KVM_PGTABLE_MIN_BLOCK_LEVEL;
s8 level = KVM_PGTABLE_MIN_BLOCK_LEVEL;
u32 r = 0;
for (; level < KVM_PGTABLE_MAX_LEVELS; level++)
for (; level <= KVM_PGTABLE_LAST_LEVEL; level++)
r |= BIT(kvm_granule_shift(level));
return r;
@ -144,7 +170,7 @@ struct kvm_pgtable_mm_ops {
void* (*zalloc_page)(void *arg);
void* (*zalloc_pages_exact)(size_t size);
void (*free_pages_exact)(void *addr, size_t size);
void (*free_unlinked_table)(void *addr, u32 level);
void (*free_unlinked_table)(void *addr, s8 level);
void (*get_page)(void *addr);
void (*put_page)(void *addr);
int (*page_count)(void *addr);
@ -240,7 +266,7 @@ struct kvm_pgtable_visit_ctx {
u64 start;
u64 addr;
u64 end;
u32 level;
s8 level;
enum kvm_pgtable_walk_flags flags;
};
@ -343,7 +369,7 @@ static inline bool kvm_pgtable_walk_lock_held(void)
*/
struct kvm_pgtable {
u32 ia_bits;
u32 start_level;
s8 start_level;
kvm_pteref_t pgd;
struct kvm_pgtable_mm_ops *mm_ops;
@ -477,7 +503,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt);
* The page-table is assumed to be unreachable by any hardware walkers prior to
* freeing and therefore no TLB invalidation is performed.
*/
void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level);
void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level);
/**
* kvm_pgtable_stage2_create_unlinked() - Create an unlinked stage-2 paging structure.
@ -501,7 +527,7 @@ void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *p
* an ERR_PTR(error) on failure.
*/
kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
u64 phys, u32 level,
u64 phys, s8 level,
enum kvm_pgtable_prot prot,
void *mc, bool force_pte);
@ -727,7 +753,7 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
kvm_pte_t *ptep, u32 *level);
kvm_pte_t *ptep, s8 *level);
/**
* kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a

5
arch/arm64/include/asm/kvm_pkvm.h
View File

@ -56,10 +56,11 @@ static inline unsigned long hyp_vm_table_pages(void)
static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
{
unsigned long total = 0, i;
unsigned long total = 0;
int i;
/* Provision the worst case scenario */
for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
for (i = KVM_PGTABLE_FIRST_LEVEL; i <= KVM_PGTABLE_LAST_LEVEL; i++) {
nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
total += nr_pages;
}

103
arch/arm64/include/asm/vncr_mapping.h Normal file
View File

@ -0,0 +1,103 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* System register offsets in the VNCR page
* All offsets are *byte* displacements!
*/
#ifndef __ARM64_VNCR_MAPPING_H__
#define __ARM64_VNCR_MAPPING_H__
#define VNCR_VTTBR_EL2 0x020
#define VNCR_VTCR_EL2 0x040
#define VNCR_VMPIDR_EL2 0x050
#define VNCR_CNTVOFF_EL2 0x060
#define VNCR_HCR_EL2 0x078
#define VNCR_HSTR_EL2 0x080
#define VNCR_VPIDR_EL2 0x088
#define VNCR_TPIDR_EL2 0x090
#define VNCR_HCRX_EL2 0x0A0
#define VNCR_VNCR_EL2 0x0B0
#define VNCR_CPACR_EL1 0x100
#define VNCR_CONTEXTIDR_EL1 0x108
#define VNCR_SCTLR_EL1 0x110
#define VNCR_ACTLR_EL1 0x118
#define VNCR_TCR_EL1 0x120
#define VNCR_AFSR0_EL1 0x128
#define VNCR_AFSR1_EL1 0x130
#define VNCR_ESR_EL1 0x138
#define VNCR_MAIR_EL1 0x140
#define VNCR_AMAIR_EL1 0x148
#define VNCR_MDSCR_EL1 0x158
#define VNCR_SPSR_EL1 0x160
#define VNCR_CNTV_CVAL_EL0 0x168
#define VNCR_CNTV_CTL_EL0 0x170
#define VNCR_CNTP_CVAL_EL0 0x178
#define VNCR_CNTP_CTL_EL0 0x180
#define VNCR_SCXTNUM_EL1 0x188
#define VNCR_TFSR_EL1 0x190
#define VNCR_HFGRTR_EL2 0x1B8
#define VNCR_HFGWTR_EL2 0x1C0
#define VNCR_HFGITR_EL2 0x1C8
#define VNCR_HDFGRTR_EL2 0x1D0
#define VNCR_HDFGWTR_EL2 0x1D8
#define VNCR_ZCR_EL1 0x1E0
#define VNCR_HAFGRTR_EL2 0x1E8
#define VNCR_TTBR0_EL1 0x200
#define VNCR_TTBR1_EL1 0x210
#define VNCR_FAR_EL1 0x220
#define VNCR_ELR_EL1 0x230
#define VNCR_SP_EL1 0x240
#define VNCR_VBAR_EL1 0x250
#define VNCR_TCR2_EL1 0x270
#define VNCR_PIRE0_EL1 0x290
#define VNCR_PIRE0_EL2 0x298
#define VNCR_PIR_EL1 0x2A0
#define VNCR_ICH_LR0_EL2 0x400
#define VNCR_ICH_LR1_EL2 0x408
#define VNCR_ICH_LR2_EL2 0x410
#define VNCR_ICH_LR3_EL2 0x418
#define VNCR_ICH_LR4_EL2 0x420
#define VNCR_ICH_LR5_EL2 0x428
#define VNCR_ICH_LR6_EL2 0x430
#define VNCR_ICH_LR7_EL2 0x438
#define VNCR_ICH_LR8_EL2 0x440
#define VNCR_ICH_LR9_EL2 0x448
#define VNCR_ICH_LR10_EL2 0x450
#define VNCR_ICH_LR11_EL2 0x458
#define VNCR_ICH_LR12_EL2 0x460
#define VNCR_ICH_LR13_EL2 0x468
#define VNCR_ICH_LR14_EL2 0x470
#define VNCR_ICH_LR15_EL2 0x478
#define VNCR_ICH_AP0R0_EL2 0x480
#define VNCR_ICH_AP0R1_EL2 0x488
#define VNCR_ICH_AP0R2_EL2 0x490
#define VNCR_ICH_AP0R3_EL2 0x498
#define VNCR_ICH_AP1R0_EL2 0x4A0
#define VNCR_ICH_AP1R1_EL2 0x4A8
#define VNCR_ICH_AP1R2_EL2 0x4B0
#define VNCR_ICH_AP1R3_EL2 0x4B8
#define VNCR_ICH_HCR_EL2 0x4C0
#define VNCR_ICH_VMCR_EL2 0x4C8
#define VNCR_VDISR_EL2 0x500
#define VNCR_PMBLIMITR_EL1 0x800
#define VNCR_PMBPTR_EL1 0x810
#define VNCR_PMBSR_EL1 0x820
#define VNCR_PMSCR_EL1 0x828
#define VNCR_PMSEVFR_EL1 0x830
#define VNCR_PMSICR_EL1 0x838
#define VNCR_PMSIRR_EL1 0x840
#define VNCR_PMSLATFR_EL1 0x848
#define VNCR_TRFCR_EL1 0x880
#define VNCR_MPAM1_EL1 0x900
#define VNCR_MPAMHCR_EL2 0x930
#define VNCR_MPAMVPMV_EL2 0x938
#define VNCR_MPAMVPM0_EL2 0x940
#define VNCR_MPAMVPM1_EL2 0x948
#define VNCR_MPAMVPM2_EL2 0x950
#define VNCR_MPAMVPM3_EL2 0x958
#define VNCR_MPAMVPM4_EL2 0x960
#define VNCR_MPAMVPM5_EL2 0x968
#define VNCR_MPAMVPM6_EL2 0x970
#define VNCR_MPAMVPM7_EL2 0x978
#endif /* __ARM64_VNCR_MAPPING_H__ */

2
arch/arm64/kernel/cpufeature.c
View File

@ -2341,7 +2341,7 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
.capability = ARM64_HAS_NESTED_VIRT,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,
.matches = has_nested_virt_support,
ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, NV, IMP)
ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, NV, NV2)
},
{
.capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE,

7
arch/arm64/kvm/Kconfig
View File

@ -21,16 +21,14 @@ if VIRTUALIZATION
menuconfig KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
select KVM_COMMON
select KVM_GENERIC_HARDWARE_ENABLING
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select KVM_GENERIC_MMU_NOTIFIER
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_XFER_TO_GUEST_WORK
select KVM_VFIO
select HAVE_KVM_EVENTFD
select HAVE_KVM_IRQFD
select HAVE_KVM_DIRTY_RING_ACQ_REL
select NEED_KVM_DIRTY_RING_WITH_BITMAP
select HAVE_KVM_MSI
@ -41,7 +39,6 @@ menuconfig KVM
select HAVE_KVM_VCPU_RUN_PID_CHANGE
select SCHED_INFO
select GUEST_PERF_EVENTS if PERF_EVENTS
select INTERVAL_TREE
select XARRAY_MULTI
help
Support hosting virtualized guest machines.

3
arch/arm64/kvm/arch_timer.c
View File

@ -295,8 +295,7 @@ static u64 wfit_delay_ns(struct kvm_vcpu *vcpu)
u64 val = vcpu_get_reg(vcpu, kvm_vcpu_sys_get_rt(vcpu));
struct arch_timer_context *ctx;
ctx = (vcpu_has_nv(vcpu) && is_hyp_ctxt(vcpu)) ? vcpu_hvtimer(vcpu)
: vcpu_vtimer(vcpu);
ctx = is_hyp_ctxt(vcpu) ? vcpu_hvtimer(vcpu) : vcpu_vtimer(vcpu);
return kvm_counter_compute_delta(ctx, val);
}

12
arch/arm64/kvm/arm.c
View File

@ -221,7 +221,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = vgic_present;
break;
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
@ -669,6 +668,12 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
return ret;
}
if (vcpu_has_nv(vcpu)) {
ret = kvm_init_nv_sysregs(vcpu->kvm);
if (ret)
return ret;
}
ret = kvm_timer_enable(vcpu);
if (ret)
return ret;
@ -1837,6 +1842,7 @@ static int kvm_init_vector_slots(void)
static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits)
{
struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
u64 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
unsigned long tcr;
/*
@ -1859,6 +1865,10 @@ static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits)
}
tcr &= ~TCR_T0SZ_MASK;
tcr |= TCR_T0SZ(hyp_va_bits);
tcr &= ~TCR_EL2_PS_MASK;
tcr |= FIELD_PREP(TCR_EL2_PS_MASK, kvm_get_parange(mmfr0));
if (kvm_lpa2_is_enabled())
tcr |= TCR_EL2_DS;
params->tcr_el2 = tcr;
params->pgd_pa = kvm_mmu_get_httbr();

63
arch/arm64/kvm/emulate-nested.c
View File

@ -1012,6 +1012,7 @@ enum fgt_group_id {
HDFGRTR_GROUP,
HDFGWTR_GROUP,
HFGITR_GROUP,
HAFGRTR_GROUP,
/* Must be last */
__NR_FGT_GROUP_IDS__
@ -1042,10 +1043,20 @@ enum fg_filter_id {
static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
/* HFGRTR_EL2, HFGWTR_EL2 */
SR_FGT(SYS_AMAIR2_EL1, HFGxTR, nAMAIR2_EL1, 0),
SR_FGT(SYS_MAIR2_EL1, HFGxTR, nMAIR2_EL1, 0),
SR_FGT(SYS_S2POR_EL1, HFGxTR, nS2POR_EL1, 0),
SR_FGT(SYS_POR_EL1, HFGxTR, nPOR_EL1, 0),
SR_FGT(SYS_POR_EL0, HFGxTR, nPOR_EL0, 0),
SR_FGT(SYS_PIR_EL1, HFGxTR, nPIR_EL1, 0),
SR_FGT(SYS_PIRE0_EL1, HFGxTR, nPIRE0_EL1, 0),
SR_FGT(SYS_RCWMASK_EL1, HFGxTR, nRCWMASK_EL1, 0),
SR_FGT(SYS_TPIDR2_EL0, HFGxTR, nTPIDR2_EL0, 0),
SR_FGT(SYS_SMPRI_EL1, HFGxTR, nSMPRI_EL1, 0),
SR_FGT(SYS_GCSCR_EL1, HFGxTR, nGCS_EL1, 0),
SR_FGT(SYS_GCSPR_EL1, HFGxTR, nGCS_EL1, 0),
SR_FGT(SYS_GCSCRE0_EL1, HFGxTR, nGCS_EL0, 0),
SR_FGT(SYS_GCSPR_EL0, HFGxTR, nGCS_EL0, 0),
SR_FGT(SYS_ACCDATA_EL1, HFGxTR, nACCDATA_EL1, 0),
SR_FGT(SYS_ERXADDR_EL1, HFGxTR, ERXADDR_EL1, 1),
SR_FGT(SYS_ERXPFGCDN_EL1, HFGxTR, ERXPFGCDN_EL1, 1),
@ -1107,6 +1118,11 @@ static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
SR_FGT(SYS_AFSR1_EL1, HFGxTR, AFSR1_EL1, 1),
SR_FGT(SYS_AFSR0_EL1, HFGxTR, AFSR0_EL1, 1),
/* HFGITR_EL2 */
SR_FGT(OP_AT_S1E1A, HFGITR, ATS1E1A, 1),
SR_FGT(OP_COSP_RCTX, HFGITR, COSPRCTX, 1),
SR_FGT(OP_GCSPUSHX, HFGITR, nGCSEPP, 0),
SR_FGT(OP_GCSPOPX, HFGITR, nGCSEPP, 0),
SR_FGT(OP_GCSPUSHM, HFGITR, nGCSPUSHM_EL1, 0),
SR_FGT(OP_BRB_IALL, HFGITR, nBRBIALL, 0),
SR_FGT(OP_BRB_INJ, HFGITR, nBRBINJ, 0),
SR_FGT(SYS_DC_CVAC, HFGITR, DCCVAC, 1),
@ -1674,6 +1690,49 @@ static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
SR_FGT(SYS_PMCR_EL0, HDFGWTR, PMCR_EL0, 1),
SR_FGT(SYS_PMSWINC_EL0, HDFGWTR, PMSWINC_EL0, 1),
SR_FGT(SYS_OSLAR_EL1, HDFGWTR, OSLAR_EL1, 1),
/*
* HAFGRTR_EL2
*/
SR_FGT(SYS_AMEVTYPER1_EL0(15), HAFGRTR, AMEVTYPER115_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(14), HAFGRTR, AMEVTYPER114_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(13), HAFGRTR, AMEVTYPER113_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(12), HAFGRTR, AMEVTYPER112_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(11), HAFGRTR, AMEVTYPER111_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(10), HAFGRTR, AMEVTYPER110_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(9), HAFGRTR, AMEVTYPER19_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(8), HAFGRTR, AMEVTYPER18_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(7), HAFGRTR, AMEVTYPER17_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(6), HAFGRTR, AMEVTYPER16_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(5), HAFGRTR, AMEVTYPER15_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(4), HAFGRTR, AMEVTYPER14_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(3), HAFGRTR, AMEVTYPER13_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(2), HAFGRTR, AMEVTYPER12_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(1), HAFGRTR, AMEVTYPER11_EL0, 1),
SR_FGT(SYS_AMEVTYPER1_EL0(0), HAFGRTR, AMEVTYPER10_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(15), HAFGRTR, AMEVCNTR115_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(14), HAFGRTR, AMEVCNTR114_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(13), HAFGRTR, AMEVCNTR113_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(12), HAFGRTR, AMEVCNTR112_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(11), HAFGRTR, AMEVCNTR111_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(10), HAFGRTR, AMEVCNTR110_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(9), HAFGRTR, AMEVCNTR19_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(8), HAFGRTR, AMEVCNTR18_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(7), HAFGRTR, AMEVCNTR17_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(6), HAFGRTR, AMEVCNTR16_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(5), HAFGRTR, AMEVCNTR15_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(4), HAFGRTR, AMEVCNTR14_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(3), HAFGRTR, AMEVCNTR13_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(2), HAFGRTR, AMEVCNTR12_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(1), HAFGRTR, AMEVCNTR11_EL0, 1),
SR_FGT(SYS_AMEVCNTR1_EL0(0), HAFGRTR, AMEVCNTR10_EL0, 1),
SR_FGT(SYS_AMCNTENCLR1_EL0, HAFGRTR, AMCNTEN1, 1),
SR_FGT(SYS_AMCNTENSET1_EL0, HAFGRTR, AMCNTEN1, 1),
SR_FGT(SYS_AMCNTENCLR0_EL0, HAFGRTR, AMCNTEN0, 1),
SR_FGT(SYS_AMCNTENSET0_EL0, HAFGRTR, AMCNTEN0, 1),
SR_FGT(SYS_AMEVCNTR0_EL0(3), HAFGRTR, AMEVCNTR03_EL0, 1),
SR_FGT(SYS_AMEVCNTR0_EL0(2), HAFGRTR, AMEVCNTR02_EL0, 1),
SR_FGT(SYS_AMEVCNTR0_EL0(1), HAFGRTR, AMEVCNTR01_EL0, 1),
SR_FGT(SYS_AMEVCNTR0_EL0(0), HAFGRTR, AMEVCNTR00_EL0, 1),
};
static union trap_config get_trap_config(u32 sysreg)
@ -1894,6 +1953,10 @@ bool __check_nv_sr_forward(struct kvm_vcpu *vcpu)
val = sanitised_sys_reg(vcpu, HDFGWTR_EL2);
break;
case HAFGRTR_GROUP:
val = sanitised_sys_reg(vcpu, HAFGRTR_EL2);
break;
case HFGITR_GROUP:
val = sanitised_sys_reg(vcpu, HFGITR_EL2);
switch (tc.fgf) {

2
arch/arm64/kvm/hyp/include/hyp/fault.h
View File

@ -60,7 +60,7 @@ static inline bool __get_fault_info(u64 esr, struct kvm_vcpu_fault_info *fault)
*/
if (!(esr & ESR_ELx_S1PTW) &&
(cpus_have_final_cap(ARM64_WORKAROUND_834220) ||
(esr & ESR_ELx_FSC_TYPE) == ESR_ELx_FSC_PERM)) {
esr_fsc_is_permission_fault(esr))) {
if (!__translate_far_to_hpfar(far, &hpfar))
return false;
} else {

93
arch/arm64/kvm/hyp/include/hyp/switch.h
View File

@ -79,6 +79,45 @@ static inline void __activate_traps_fpsimd32(struct kvm_vcpu *vcpu)
clr |= ~hfg & __ ## reg ## _nMASK; \
} while(0)
#define update_fgt_traps_cs(vcpu, reg, clr, set) \
do { \
struct kvm_cpu_context *hctxt = \
&this_cpu_ptr(&kvm_host_data)->host_ctxt; \
u64 c = 0, s = 0; \
\
ctxt_sys_reg(hctxt, reg) = read_sysreg_s(SYS_ ## reg); \
compute_clr_set(vcpu, reg, c, s); \
s |= set; \
c |= clr; \
if (c || s) { \
u64 val = __ ## reg ## _nMASK; \
val |= s; \
val &= ~c; \
write_sysreg_s(val, SYS_ ## reg); \
} \
} while(0)
#define update_fgt_traps(vcpu, reg) \
update_fgt_traps_cs(vcpu, reg, 0, 0)
/*
* Validate the fine grain trap masks.
* Check that the masks do not overlap and that all bits are accounted for.
*/
#define CHECK_FGT_MASKS(reg) \
do { \
BUILD_BUG_ON((__ ## reg ## _MASK) & (__ ## reg ## _nMASK)); \
BUILD_BUG_ON(~((__ ## reg ## _RES0) ^ (__ ## reg ## _MASK) ^ \
(__ ## reg ## _nMASK))); \
} while(0)
static inline bool cpu_has_amu(void)
{
u64 pfr0 = read_sysreg_s(SYS_ID_AA64PFR0_EL1);
return cpuid_feature_extract_unsigned_field(pfr0,
ID_AA64PFR0_EL1_AMU_SHIFT);
}
static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
{
@ -86,6 +125,14 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
u64 r_clr = 0, w_clr = 0, r_set = 0, w_set = 0, tmp;
u64 r_val, w_val;
CHECK_FGT_MASKS(HFGRTR_EL2);
CHECK_FGT_MASKS(HFGWTR_EL2);
CHECK_FGT_MASKS(HFGITR_EL2);
CHECK_FGT_MASKS(HDFGRTR_EL2);
CHECK_FGT_MASKS(HDFGWTR_EL2);
CHECK_FGT_MASKS(HAFGRTR_EL2);
CHECK_FGT_MASKS(HCRX_EL2);
if (!cpus_have_final_cap(ARM64_HAS_FGT))
return;
@ -110,12 +157,15 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
compute_clr_set(vcpu, HFGWTR_EL2, w_clr, w_set);
}
/* The default is not to trap anything but ACCDATA_EL1 */
r_val = __HFGRTR_EL2_nMASK & ~HFGxTR_EL2_nACCDATA_EL1;
/* The default to trap everything not handled or supported in KVM. */
tmp = HFGxTR_EL2_nAMAIR2_EL1 | HFGxTR_EL2_nMAIR2_EL1 | HFGxTR_EL2_nS2POR_EL1 |
HFGxTR_EL2_nPOR_EL1 | HFGxTR_EL2_nPOR_EL0 | HFGxTR_EL2_nACCDATA_EL1;
r_val = __HFGRTR_EL2_nMASK & ~tmp;
r_val |= r_set;
r_val &= ~r_clr;
w_val = __HFGWTR_EL2_nMASK & ~HFGxTR_EL2_nACCDATA_EL1;
w_val = __HFGWTR_EL2_nMASK & ~tmp;
w_val |= w_set;
w_val &= ~w_clr;
@ -125,34 +175,12 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
if (!vcpu_has_nv(vcpu) || is_hyp_ctxt(vcpu))
return;
ctxt_sys_reg(hctxt, HFGITR_EL2) = read_sysreg_s(SYS_HFGITR_EL2);
update_fgt_traps(vcpu, HFGITR_EL2);
update_fgt_traps(vcpu, HDFGRTR_EL2);
update_fgt_traps(vcpu, HDFGWTR_EL2);
r_set = r_clr = 0;
compute_clr_set(vcpu, HFGITR_EL2, r_clr, r_set);
r_val = __HFGITR_EL2_nMASK;
r_val |= r_set;
r_val &= ~r_clr;
write_sysreg_s(r_val, SYS_HFGITR_EL2);
ctxt_sys_reg(hctxt, HDFGRTR_EL2) = read_sysreg_s(SYS_HDFGRTR_EL2);
ctxt_sys_reg(hctxt, HDFGWTR_EL2) = read_sysreg_s(SYS_HDFGWTR_EL2);
r_clr = r_set = w_clr = w_set = 0;
compute_clr_set(vcpu, HDFGRTR_EL2, r_clr, r_set);
compute_clr_set(vcpu, HDFGWTR_EL2, w_clr, w_set);
r_val = __HDFGRTR_EL2_nMASK;
r_val |= r_set;
r_val &= ~r_clr;
w_val = __HDFGWTR_EL2_nMASK;
w_val |= w_set;
w_val &= ~w_clr;
write_sysreg_s(r_val, SYS_HDFGRTR_EL2);
write_sysreg_s(w_val, SYS_HDFGWTR_EL2);
if (cpu_has_amu())
update_fgt_traps(vcpu, HAFGRTR_EL2);
}
static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu)
@ -171,6 +199,9 @@ static inline void __deactivate_traps_hfgxtr(struct kvm_vcpu *vcpu)
write_sysreg_s(ctxt_sys_reg(hctxt, HFGITR_EL2), SYS_HFGITR_EL2);
write_sysreg_s(ctxt_sys_reg(hctxt, HDFGRTR_EL2), SYS_HDFGRTR_EL2);
write_sysreg_s(ctxt_sys_reg(hctxt, HDFGWTR_EL2), SYS_HDFGWTR_EL2);
if (cpu_has_amu())
write_sysreg_s(ctxt_sys_reg(hctxt, HAFGRTR_EL2), SYS_HAFGRTR_EL2);
}
static inline void __activate_traps_common(struct kvm_vcpu *vcpu)
@ -591,7 +622,7 @@ static bool kvm_hyp_handle_dabt_low(struct kvm_vcpu *vcpu, u64 *exit_code)
if (static_branch_unlikely(&vgic_v2_cpuif_trap)) {
bool valid;
valid = kvm_vcpu_trap_get_fault_type(vcpu) == ESR_ELx_FSC_FAULT &&
valid = kvm_vcpu_trap_is_translation_fault(vcpu) &&
kvm_vcpu_dabt_isvalid(vcpu) &&
!kvm_vcpu_abt_issea(vcpu) &&
!kvm_vcpu_abt_iss1tw(vcpu);

22
arch/arm64/kvm/hyp/include/nvhe/fixed_config.h
View File

@ -69,6 +69,8 @@
ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SSBS) \
)
#define PVM_ID_AA64PFR2_ALLOW 0ULL
/*
* Allow for protected VMs:
* - Mixed-endian
@ -101,6 +103,7 @@
* - Privileged Access Never
* - SError interrupt exceptions from speculative reads
* - Enhanced Translation Synchronization
* - Control for cache maintenance permission
*/
#define PVM_ID_AA64MMFR1_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_HAFDBS) | \
@ -108,7 +111,8 @@
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_HPDS) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_PAN) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_SpecSEI) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_ETS) \
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_ETS) | \
ARM64_FEATURE_MASK(ID_AA64MMFR1_EL1_CMOW) \
)
/*
@ -133,6 +137,8 @@
ARM64_FEATURE_MASK(ID_AA64MMFR2_EL1_E0PD) \
)
#define PVM_ID_AA64MMFR3_ALLOW (0ULL)
/*
* No support for Scalable Vectors for protected VMs:
* Requires additional support from KVM, e.g., context-switching and
@ -178,10 +184,18 @@
ARM64_FEATURE_MASK(ID_AA64ISAR0_EL1_RNDR) \
)
/* Restrict pointer authentication to the basic version. */
#define PVM_ID_AA64ISAR1_RESTRICT_UNSIGNED (\
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA), ID_AA64ISAR1_EL1_APA_PAuth) | \
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API), ID_AA64ISAR1_EL1_API_PAuth) \
)
#define PVM_ID_AA64ISAR2_RESTRICT_UNSIGNED (\
FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3), ID_AA64ISAR2_EL1_APA3_PAuth) \
)
#define PVM_ID_AA64ISAR1_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_DPB) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_APA) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_API) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_JSCVT) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_FCMA) | \
ARM64_FEATURE_MASK(ID_AA64ISAR1_EL1_LRCPC) | \
@ -196,8 +210,8 @@
)
#define PVM_ID_AA64ISAR2_ALLOW (\
ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_ATS1A)| \
ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_GPA3) | \
ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_APA3) | \
ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS) \
)

6
arch/arm64/kvm/hyp/nvhe/hyp-init.S
View File

@ -122,11 +122,7 @@ alternative_if ARM64_HAS_CNP
alternative_else_nop_endif
msr ttbr0_el2, x2
/*
* Set the PS bits in TCR_EL2.
*/
ldr x0, [x0, #NVHE_INIT_TCR_EL2]
tcr_compute_pa_size x0, #TCR_EL2_PS_SHIFT, x1, x2
msr tcr_el2, x0
isb
@ -292,6 +288,8 @@ alternative_else_nop_endif
mov sp, x0
/* And turn the MMU back on! */
dsb nsh
isb
set_sctlr_el2 x2
ret x1
SYM_FUNC_END(__pkvm_init_switch_pgd)

6
arch/arm64/kvm/hyp/nvhe/mem_protect.c
View File

@ -91,7 +91,7 @@ static void host_s2_put_page(void *addr)
hyp_put_page(&host_s2_pool, addr);
}
static void host_s2_free_unlinked_table(void *addr, u32 level)
static void host_s2_free_unlinked_table(void *addr, s8 level)
{
kvm_pgtable_stage2_free_unlinked(&host_mmu.mm_ops, addr, level);
}
@ -443,7 +443,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
{
struct kvm_mem_range cur;
kvm_pte_t pte;
u32 level;
s8 level;
int ret;
hyp_assert_lock_held(&host_mmu.lock);
@ -462,7 +462,7 @@ static int host_stage2_adjust_range(u64 addr, struct kvm_mem_range *range)
cur.start = ALIGN_DOWN(addr, granule);
cur.end = cur.start + granule;
level++;
} while ((level < KVM_PGTABLE_MAX_LEVELS) &&
} while ((level <= KVM_PGTABLE_LAST_LEVEL) &&
!(kvm_level_supports_block_mapping(level) &&
range_included(&cur, range)));

4
arch/arm64/kvm/hyp/nvhe/mm.c
View File

@ -260,7 +260,7 @@ static void fixmap_clear_slot(struct hyp_fixmap_slot *slot)
* https://lore.kernel.org/kvm/20221017115209.2099-1-will@kernel.org/T/#mf10dfbaf1eaef9274c581b81c53758918c1d0f03
*/
dsb(ishst);
__tlbi_level(vale2is, __TLBI_VADDR(addr, 0), (KVM_PGTABLE_MAX_LEVELS - 1));
__tlbi_level(vale2is, __TLBI_VADDR(addr, 0), KVM_PGTABLE_LAST_LEVEL);
dsb(ish);
isb();
}
@ -275,7 +275,7 @@ static int __create_fixmap_slot_cb(const struct kvm_pgtable_visit_ctx *ctx,
{
struct hyp_fixmap_slot *slot = per_cpu_ptr(&fixmap_slots, (u64)ctx->arg);
if (!kvm_pte_valid(ctx->old) || ctx->level != KVM_PGTABLE_MAX_LEVELS - 1)
if (!kvm_pte_valid(ctx->old) || ctx->level != KVM_PGTABLE_LAST_LEVEL)
return -EINVAL;
slot->addr = ctx->addr;

4
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@ -136,6 +136,10 @@ static void pvm_init_traps_aa64dfr0(struct kvm_vcpu *vcpu)
cptr_set |= CPTR_EL2_TTA;
}
/* Trap External Trace */
if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_ExtTrcBuff), feature_ids))
mdcr_clear |= MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT;
vcpu->arch.mdcr_el2 |= mdcr_set;
vcpu->arch.mdcr_el2 &= ~mdcr_clear;
vcpu->arch.cptr_el2 |= cptr_set;

2
arch/arm64/kvm/hyp/nvhe/setup.c
View File

@ -181,7 +181,7 @@ static int fix_host_ownership_walker(const struct kvm_pgtable_visit_ctx *ctx,
if (!kvm_pte_valid(ctx->old))
return 0;
if (ctx->level != (KVM_PGTABLE_MAX_LEVELS - 1))
if (ctx->level != KVM_PGTABLE_LAST_LEVEL)
return -EINVAL;
phys = kvm_pte_to_phys(ctx->old);

84
arch/arm64/kvm/hyp/pgtable.c
View File

@ -79,7 +79,10 @@ static bool kvm_pgtable_walk_skip_cmo(const struct kvm_pgtable_visit_ctx *ctx)
static bool kvm_phys_is_valid(u64 phys)
{
return phys < BIT(id_aa64mmfr0_parange_to_phys_shift(ID_AA64MMFR0_EL1_PARANGE_MAX));
u64 parange_max = kvm_get_parange_max();
u8 shift = id_aa64mmfr0_parange_to_phys_shift(parange_max);
return phys < BIT(shift);
}
static bool kvm_block_mapping_supported(const struct kvm_pgtable_visit_ctx *ctx, u64 phys)
@ -98,7 +101,7 @@ static bool kvm_block_mapping_supported(const struct kvm_pgtable_visit_ctx *ctx,
return IS_ALIGNED(ctx->addr, granule);
}
static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, u32 level)
static u32 kvm_pgtable_idx(struct kvm_pgtable_walk_data *data, s8 level)
{
u64 shift = kvm_granule_shift(level);
u64 mask = BIT(PAGE_SHIFT - 3) - 1;
@ -114,7 +117,7 @@ static u32 kvm_pgd_page_idx(struct kvm_pgtable *pgt, u64 addr)
return (addr & mask) >> shift;
}
static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
static u32 kvm_pgd_pages(u32 ia_bits, s8 start_level)
{
struct kvm_pgtable pgt = {
.ia_bits = ia_bits,
@ -124,9 +127,9 @@ static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
return kvm_pgd_page_idx(&pgt, -1ULL) + 1;
}
static bool kvm_pte_table(kvm_pte_t pte, u32 level)
static bool kvm_pte_table(kvm_pte_t pte, s8 level)
{
if (level == KVM_PGTABLE_MAX_LEVELS - 1)
if (level == KVM_PGTABLE_LAST_LEVEL)
return false;
if (!kvm_pte_valid(pte))
@ -154,10 +157,10 @@ static kvm_pte_t kvm_init_table_pte(kvm_pte_t *childp, struct kvm_pgtable_mm_ops
return pte;
}
static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, u32 level)
static kvm_pte_t kvm_init_valid_leaf_pte(u64 pa, kvm_pte_t attr, s8 level)
{
kvm_pte_t pte = kvm_phys_to_pte(pa);
u64 type = (level == KVM_PGTABLE_MAX_LEVELS - 1) ? KVM_PTE_TYPE_PAGE :
u64 type = (level == KVM_PGTABLE_LAST_LEVEL) ? KVM_PTE_TYPE_PAGE :
KVM_PTE_TYPE_BLOCK;
pte |= attr & (KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI);
@ -203,11 +206,11 @@ static bool kvm_pgtable_walk_continue(const struct kvm_pgtable_walker *walker,
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level);
struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, s8 level);
static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
struct kvm_pgtable_mm_ops *mm_ops,
kvm_pteref_t pteref, u32 level)
kvm_pteref_t pteref, s8 level)
{
enum kvm_pgtable_walk_flags flags = data->walker->flags;
kvm_pte_t *ptep = kvm_dereference_pteref(data->walker, pteref);
@ -272,12 +275,13 @@ static inline int __kvm_pgtable_visit(struct kvm_pgtable_walk_data *data,
}
static int __kvm_pgtable_walk(struct kvm_pgtable_walk_data *data,
struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, u32 level)
struct kvm_pgtable_mm_ops *mm_ops, kvm_pteref_t pgtable, s8 level)
{
u32 idx;
int ret = 0;
if (WARN_ON_ONCE(level >= KVM_PGTABLE_MAX_LEVELS))
if (WARN_ON_ONCE(level < KVM_PGTABLE_FIRST_LEVEL ||
level > KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
for (idx = kvm_pgtable_idx(data, level); idx < PTRS_PER_PTE; ++idx) {
@ -340,7 +344,7 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
struct leaf_walk_data {
kvm_pte_t pte;
u32 level;
s8 level;
};
static int leaf_walker(const struct kvm_pgtable_visit_ctx *ctx,
@ -355,7 +359,7 @@ static int leaf_walker(const struct kvm_pgtable_visit_ctx *ctx,
}
int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
kvm_pte_t *ptep, u32 *level)
kvm_pte_t *ptep, s8 *level)
{
struct leaf_walk_data data;
struct kvm_pgtable_walker walker = {
@ -408,6 +412,7 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
}
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_AP, ap);
if (!kvm_lpa2_is_enabled())
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_SH, sh);
attr |= KVM_PTE_LEAF_ATTR_LO_S1_AF;
attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW;
@ -467,7 +472,7 @@ static int hyp_map_walker(const struct kvm_pgtable_visit_ctx *ctx,
if (hyp_map_walker_try_leaf(ctx, data))
return 0;
if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1))
if (WARN_ON(ctx->level == KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
childp = (kvm_pte_t *)mm_ops->zalloc_page(NULL);
@ -563,14 +568,19 @@ u64 kvm_pgtable_hyp_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
int kvm_pgtable_hyp_init(struct kvm_pgtable *pgt, u32 va_bits,
struct kvm_pgtable_mm_ops *mm_ops)
{
u64 levels = ARM64_HW_PGTABLE_LEVELS(va_bits);
s8 start_level = KVM_PGTABLE_LAST_LEVEL + 1 -
ARM64_HW_PGTABLE_LEVELS(va_bits);
if (start_level < KVM_PGTABLE_FIRST_LEVEL ||
start_level > KVM_PGTABLE_LAST_LEVEL)
return -EINVAL;
pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_page(NULL);
if (!pgt->pgd)
return -ENOMEM;
pgt->ia_bits = va_bits;
pgt->start_level = KVM_PGTABLE_MAX_LEVELS - levels;
pgt->start_level = start_level;
pgt->mm_ops = mm_ops;
pgt->mmu = NULL;
pgt->force_pte_cb = NULL;
@ -624,7 +634,7 @@ struct stage2_map_data {
u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
{
u64 vtcr = VTCR_EL2_FLAGS;
u8 lvls;
s8 lvls;
vtcr |= kvm_get_parange(mmfr0) << VTCR_EL2_PS_SHIFT;
vtcr |= VTCR_EL2_T0SZ(phys_shift);
@ -635,6 +645,15 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
lvls = stage2_pgtable_levels(phys_shift);
if (lvls < 2)
lvls = 2;
/*
* When LPA2 is enabled, the HW supports an extra level of translation
* (for 5 in total) when using 4K pages. It also introduces VTCR_EL2.SL2
* to as an addition to SL0 to enable encoding this extra start level.
* However, since we always use concatenated pages for the first level
* lookup, we will never need this extra level and therefore do not need
* to touch SL2.
*/
vtcr |= VTCR_EL2_LVLS_TO_SL0(lvls);
#ifdef CONFIG_ARM64_HW_AFDBM
@ -654,6 +673,9 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
vtcr |= VTCR_EL2_HA;
#endif /* CONFIG_ARM64_HW_AFDBM */
if (kvm_lpa2_is_enabled())
vtcr |= VTCR_EL2_DS;
/* Set the vmid bits */
vtcr |= (get_vmid_bits(mmfr1) == 16) ?
VTCR_EL2_VS_16BIT :
@ -711,7 +733,9 @@ static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot p
if (prot & KVM_PGTABLE_PROT_W)
attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W;
if (!kvm_lpa2_is_enabled())
attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh);
attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF;
attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW;
*ptep = attr;
@ -902,7 +926,7 @@ static bool stage2_leaf_mapping_allowed(const struct kvm_pgtable_visit_ctx *ctx,
{
u64 phys = stage2_map_walker_phys_addr(ctx, data);
if (data->force_pte && (ctx->level < (KVM_PGTABLE_MAX_LEVELS - 1)))
if (data->force_pte && ctx->level < KVM_PGTABLE_LAST_LEVEL)
return false;
return kvm_block_mapping_supported(ctx, phys);
@ -981,7 +1005,7 @@ static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
if (ret != -E2BIG)
return ret;
if (WARN_ON(ctx->level == KVM_PGTABLE_MAX_LEVELS - 1))
if (WARN_ON(ctx->level == KVM_PGTABLE_LAST_LEVEL))
return -EINVAL;
if (!data->memcache)
@ -1151,7 +1175,7 @@ struct stage2_attr_data {
kvm_pte_t attr_set;
kvm_pte_t attr_clr;
kvm_pte_t pte;
u32 level;
s8 level;
};
static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
@ -1194,7 +1218,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
u64 size, kvm_pte_t attr_set,
kvm_pte_t attr_clr, kvm_pte_t *orig_pte,
u32 *level, enum kvm_pgtable_walk_flags flags)
s8 *level, enum kvm_pgtable_walk_flags flags)
{
int ret;
kvm_pte_t attr_mask = KVM_PTE_LEAF_ATTR_LO | KVM_PTE_LEAF_ATTR_HI;
@ -1296,7 +1320,7 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
enum kvm_pgtable_prot prot)
{
int ret;
u32 level;
s8 level;
kvm_pte_t set = 0, clr = 0;
if (prot & KVM_PTE_LEAF_ATTR_HI_SW)
@ -1349,7 +1373,7 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
}
kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
u64 phys, u32 level,
u64 phys, s8 level,
enum kvm_pgtable_prot prot,
void *mc, bool force_pte)
{
@ -1407,7 +1431,7 @@ kvm_pte_t *kvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt,
* fully populated tree up to the PTE entries. Note that @level is
* interpreted as in "level @level entry".
*/
static int stage2_block_get_nr_page_tables(u32 level)
static int stage2_block_get_nr_page_tables(s8 level)
{
switch (level) {
case 1:
@ -1418,7 +1442,7 @@ static int stage2_block_get_nr_page_tables(u32 level)
return 0;
default:
WARN_ON_ONCE(level < KVM_PGTABLE_MIN_BLOCK_LEVEL ||
level >= KVM_PGTABLE_MAX_LEVELS);
level > KVM_PGTABLE_LAST_LEVEL);
return -EINVAL;
};
}
@ -1431,13 +1455,13 @@ static int stage2_split_walker(const struct kvm_pgtable_visit_ctx *ctx,
struct kvm_s2_mmu *mmu;
kvm_pte_t pte = ctx->old, new, *childp;
enum kvm_pgtable_prot prot;
u32 level = ctx->level;
s8 level = ctx->level;
bool force_pte;
int nr_pages;
u64 phys;
/* No huge-pages exist at the last level */
if (level == KVM_PGTABLE_MAX_LEVELS - 1)
if (level == KVM_PGTABLE_LAST_LEVEL)
return 0;
/* We only split valid block mappings */
@ -1514,7 +1538,7 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu,
u64 vtcr = mmu->vtcr;
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
s8 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
pgd_sz = kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
pgt->pgd = (kvm_pteref_t)mm_ops->zalloc_pages_exact(pgd_sz);
@ -1537,7 +1561,7 @@ size_t kvm_pgtable_stage2_pgd_size(u64 vtcr)
{
u32 ia_bits = VTCR_EL2_IPA(vtcr);
u32 sl0 = FIELD_GET(VTCR_EL2_SL0_MASK, vtcr);
u32 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
s8 start_level = VTCR_EL2_TGRAN_SL0_BASE - sl0;
return kvm_pgd_pages(ia_bits, start_level) * PAGE_SIZE;
}
@ -1573,7 +1597,7 @@ void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt)
pgt->pgd = NULL;
}
void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level)
void kvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level)
{
kvm_pteref_t ptep = (kvm_pteref_t)pgtable;
struct kvm_pgtable_walker walker = {

49
arch/arm64/kvm/mmu.c
View File

@ -223,12 +223,12 @@ static void stage2_free_unlinked_table_rcu_cb(struct rcu_head *head)
{
struct page *page = container_of(head, struct page, rcu_head);
void *pgtable = page_to_virt(page);
u32 level = page_private(page);
s8 level = page_private(page);
kvm_pgtable_stage2_free_unlinked(&kvm_s2_mm_ops, pgtable, level);
}
static void stage2_free_unlinked_table(void *addr, u32 level)
static void stage2_free_unlinked_table(void *addr, s8 level)
{
struct page *page = virt_to_page(addr);
@ -804,13 +804,13 @@ static int get_user_mapping_size(struct kvm *kvm, u64 addr)
struct kvm_pgtable pgt = {
.pgd = (kvm_pteref_t)kvm->mm->pgd,
.ia_bits = vabits_actual,
.start_level = (KVM_PGTABLE_MAX_LEVELS -
CONFIG_PGTABLE_LEVELS),
.start_level = (KVM_PGTABLE_LAST_LEVEL -
CONFIG_PGTABLE_LEVELS + 1),
.mm_ops = &kvm_user_mm_ops,
};
unsigned long flags;
kvm_pte_t pte = 0; /* Keep GCC quiet... */
u32 level = ~0;
s8 level = S8_MAX;
int ret;
/*
@ -829,7 +829,9 @@ static int get_user_mapping_size(struct kvm *kvm, u64 addr)
* Not seeing an error, but not updating level? Something went
* deeply wrong...
*/
if (WARN_ON(level >= KVM_PGTABLE_MAX_LEVELS))
if (WARN_ON(level > KVM_PGTABLE_LAST_LEVEL))
return -EFAULT;
if (WARN_ON(level < KVM_PGTABLE_FIRST_LEVEL))
return -EFAULT;
/* Oops, the userspace PTs are gone... Replay the fault */
@ -1374,7 +1376,7 @@ static bool kvm_vma_mte_allowed(struct vm_area_struct *vma)
static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
struct kvm_memory_slot *memslot, unsigned long hva,
unsigned long fault_status)
bool fault_is_perm)
{
int ret = 0;
bool write_fault, writable, force_pte = false;
@ -1388,17 +1390,17 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
gfn_t gfn;
kvm_pfn_t pfn;
bool logging_active = memslot_is_logging(memslot);
unsigned long fault_level = kvm_vcpu_trap_get_fault_level(vcpu);
long vma_pagesize, fault_granule;
enum kvm_pgtable_prot prot = KVM_PGTABLE_PROT_R;
struct kvm_pgtable *pgt;
fault_granule = 1UL << ARM64_HW_PGTABLE_LEVEL_SHIFT(fault_level);
if (fault_is_perm)
fault_granule = kvm_vcpu_trap_get_perm_fault_granule(vcpu);
write_fault = kvm_is_write_fault(vcpu);
exec_fault = kvm_vcpu_trap_is_exec_fault(vcpu);
VM_BUG_ON(write_fault && exec_fault);
if (fault_status == ESR_ELx_FSC_PERM && !write_fault && !exec_fault) {
if (fault_is_perm && !write_fault && !exec_fault) {
kvm_err("Unexpected L2 read permission error\n");
return -EFAULT;
}
@ -1409,8 +1411,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* only exception to this is when dirty logging is enabled at runtime
* and a write fault needs to collapse a block entry into a table.
*/
if (fault_status != ESR_ELx_FSC_PERM ||
(logging_active && write_fault)) {
if (!fault_is_perm || (logging_active && write_fault)) {
ret = kvm_mmu_topup_memory_cache(memcache,
kvm_mmu_cache_min_pages(vcpu->arch.hw_mmu));
if (ret)
@ -1527,8 +1528,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* backed by a THP and thus use block mapping if possible.
*/
if (vma_pagesize == PAGE_SIZE && !(force_pte || device)) {
if (fault_status == ESR_ELx_FSC_PERM &&
fault_granule > PAGE_SIZE)
if (fault_is_perm && fault_granule > PAGE_SIZE)
vma_pagesize = fault_granule;
else
vma_pagesize = transparent_hugepage_adjust(kvm, memslot,
@ -1541,7 +1541,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
}
}
if (fault_status != ESR_ELx_FSC_PERM && !device && kvm_has_mte(kvm)) {
if (!fault_is_perm && !device && kvm_has_mte(kvm)) {
/* Check the VMM hasn't introduced a new disallowed VMA */
if (mte_allowed) {
sanitise_mte_tags(kvm, pfn, vma_pagesize);
@ -1567,7 +1567,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* permissions only if vma_pagesize equals fault_granule. Otherwise,
* kvm_pgtable_stage2_map() should be called to change block size.
*/
if (fault_status == ESR_ELx_FSC_PERM && vma_pagesize == fault_granule)
if (fault_is_perm && vma_pagesize == fault_granule)
ret = kvm_pgtable_stage2_relax_perms(pgt, fault_ipa, prot);
else
ret = kvm_pgtable_stage2_map(pgt, fault_ipa, vma_pagesize,
@ -1618,7 +1618,7 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
*/
int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
{
unsigned long fault_status;
unsigned long esr;
phys_addr_t fault_ipa;
struct kvm_memory_slot *memslot;
unsigned long hva;
@ -1626,12 +1626,12 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
gfn_t gfn;
int ret, idx;
fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
esr = kvm_vcpu_get_esr(vcpu);
fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
if (fault_status == ESR_ELx_FSC_FAULT) {
if (esr_fsc_is_permission_fault(esr)) {
/* Beyond sanitised PARange (which is the IPA limit) */
if (fault_ipa >= BIT_ULL(get_kvm_ipa_limit())) {
kvm_inject_size_fault(vcpu);
@ -1666,9 +1666,9 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
kvm_vcpu_get_hfar(vcpu), fault_ipa);
/* Check the stage-2 fault is trans. fault or write fault */
if (fault_status != ESR_ELx_FSC_FAULT &&
fault_status != ESR_ELx_FSC_PERM &&
fault_status != ESR_ELx_FSC_ACCESS) {
if (!esr_fsc_is_translation_fault(esr) &&
!esr_fsc_is_permission_fault(esr) &&
!esr_fsc_is_access_flag_fault(esr)) {
kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
kvm_vcpu_trap_get_class(vcpu),
(unsigned long)kvm_vcpu_trap_get_fault(vcpu),
@ -1730,13 +1730,14 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
/* Userspace should not be able to register out-of-bounds IPAs */
VM_BUG_ON(fault_ipa >= kvm_phys_size(vcpu->arch.hw_mmu));
if (fault_status == ESR_ELx_FSC_ACCESS) {
if (esr_fsc_is_access_flag_fault(esr)) {
handle_access_fault(vcpu, fault_ipa);
ret = 1;
goto out_unlock;
}
ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status);
ret = user_mem_abort(vcpu, fault_ipa, memslot, hva,
esr_fsc_is_permission_fault(esr));
if (ret == 0)
ret = 1;
out:

22
arch/arm64/kvm/nested.c
View File

@ -23,13 +23,9 @@
* This list should get updated as new features get added to the NV
* support, and new extension to the architecture.
*/
void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p,
const struct sys_reg_desc *r)
static u64 limit_nv_id_reg(u32 id, u64 val)
{
u32 id = reg_to_encoding(r);
u64 val, tmp;
val = p->regval;
u64 tmp;
switch (id) {
case SYS_ID_AA64ISAR0_EL1:
@ -158,5 +154,17 @@ void access_nested_id_reg(struct kvm_vcpu *v, struct sys_reg_params *p,
break;
}
p->regval = val;
return val;
}
int kvm_init_nv_sysregs(struct kvm *kvm)
{
mutex_lock(&kvm->arch.config_lock);
for (int i = 0; i < KVM_ARM_ID_REG_NUM; i++)
kvm->arch.id_regs[i] = limit_nv_id_reg(IDX_IDREG(i),
kvm->arch.id_regs[i]);
mutex_unlock(&kvm->arch.config_lock);
return 0;
}

9
arch/arm64/kvm/reset.c
View File

@ -280,12 +280,11 @@ int __init kvm_set_ipa_limit(void)
parange = cpuid_feature_extract_unsigned_field(mmfr0,
ID_AA64MMFR0_EL1_PARANGE_SHIFT);
/*
* IPA size beyond 48 bits could not be supported
* on either 4K or 16K page size. Hence let's cap
* it to 48 bits, in case it's reported as larger
* on the system.
* IPA size beyond 48 bits for 4K and 16K page size is only supported
* when LPA2 is available. So if we have LPA2, enable it, else cap to 48
* bits, in case it's reported as larger on the system.
*/
if (PAGE_SIZE != SZ_64K)
if (!kvm_lpa2_is_enabled() && PAGE_SIZE != SZ_64K)
parange = min(parange, (unsigned int)ID_AA64MMFR0_EL1_PARANGE_48);
/*

231
arch/arm64/kvm/sys_regs.c
View File

@ -45,43 +45,169 @@ static u64 sys_reg_to_index(const struct sys_reg_desc *reg);
static int set_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
u64 val);
static bool bad_trap(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r,
const char *msg)
{
WARN_ONCE(1, "Unexpected %s\n", msg);
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return false;
}
static bool read_from_write_only(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
{
WARN_ONCE(1, "Unexpected sys_reg read to write-only register\n");
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return false;
return bad_trap(vcpu, params, r,
"sys_reg read to write-only register");
}
static bool write_to_read_only(struct kvm_vcpu *vcpu,
struct sys_reg_params *params,
const struct sys_reg_desc *r)
{
WARN_ONCE(1, "Unexpected sys_reg write to read-only register\n");
print_sys_reg_instr(params);
kvm_inject_undefined(vcpu);
return bad_trap(vcpu, params, r,
"sys_reg write to read-only register");
}
#define PURE_EL2_SYSREG(el2) \
case el2: { \
*el1r = el2; \
return true; \
}
#define MAPPED_EL2_SYSREG(el2, el1, fn) \
case el2: { \
*xlate = fn; \
*el1r = el1; \
return true; \
}
static bool get_el2_to_el1_mapping(unsigned int reg,
unsigned int *el1r, u64 (**xlate)(u64))
{
switch (reg) {
PURE_EL2_SYSREG( VPIDR_EL2 );
PURE_EL2_SYSREG( VMPIDR_EL2 );
PURE_EL2_SYSREG( ACTLR_EL2 );
PURE_EL2_SYSREG( HCR_EL2 );
PURE_EL2_SYSREG( MDCR_EL2 );
PURE_EL2_SYSREG( HSTR_EL2 );
PURE_EL2_SYSREG( HACR_EL2 );
PURE_EL2_SYSREG( VTTBR_EL2 );
PURE_EL2_SYSREG( VTCR_EL2 );
PURE_EL2_SYSREG( RVBAR_EL2 );
PURE_EL2_SYSREG( TPIDR_EL2 );
PURE_EL2_SYSREG( HPFAR_EL2 );
PURE_EL2_SYSREG( CNTHCTL_EL2 );
MAPPED_EL2_SYSREG(SCTLR_EL2, SCTLR_EL1,
translate_sctlr_el2_to_sctlr_el1 );
MAPPED_EL2_SYSREG(CPTR_EL2, CPACR_EL1,
translate_cptr_el2_to_cpacr_el1 );
MAPPED_EL2_SYSREG(TTBR0_EL2, TTBR0_EL1,
translate_ttbr0_el2_to_ttbr0_el1 );
MAPPED_EL2_SYSREG(TTBR1_EL2, TTBR1_EL1, NULL );
MAPPED_EL2_SYSREG(TCR_EL2, TCR_EL1,
translate_tcr_el2_to_tcr_el1 );
MAPPED_EL2_SYSREG(VBAR_EL2, VBAR_EL1, NULL );
MAPPED_EL2_SYSREG(AFSR0_EL2, AFSR0_EL1, NULL );
MAPPED_EL2_SYSREG(AFSR1_EL2, AFSR1_EL1, NULL );
MAPPED_EL2_SYSREG(ESR_EL2, ESR_EL1, NULL );
MAPPED_EL2_SYSREG(FAR_EL2, FAR_EL1, NULL );
MAPPED_EL2_SYSREG(MAIR_EL2, MAIR_EL1, NULL );
MAPPED_EL2_SYSREG(AMAIR_EL2, AMAIR_EL1, NULL );
MAPPED_EL2_SYSREG(ELR_EL2, ELR_EL1, NULL );
MAPPED_EL2_SYSREG(SPSR_EL2, SPSR_EL1, NULL );
default:
return false;
}
}
u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg)
{
u64 val = 0x8badf00d8badf00d;
u64 (*xlate)(u64) = NULL;
unsigned int el1r;
if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
__vcpu_read_sys_reg_from_cpu(reg, &val))
if (!vcpu_get_flag(vcpu, SYSREGS_ON_CPU))
goto memory_read;
if (unlikely(get_el2_to_el1_mapping(reg, &el1r, &xlate))) {
if (!is_hyp_ctxt(vcpu))
goto memory_read;
/*
* If this register does not have an EL1 counterpart,
* then read the stored EL2 version.
*/
if (reg == el1r)
goto memory_read;
/*
* If we have a non-VHE guest and that the sysreg
* requires translation to be used at EL1, use the
* in-memory copy instead.
*/
if (!vcpu_el2_e2h_is_set(vcpu) && xlate)
goto memory_read;
/* Get the current version of the EL1 counterpart. */
WARN_ON(!__vcpu_read_sys_reg_from_cpu(el1r, &val));
return val;
}
/* EL1 register can't be on the CPU if the guest is in vEL2. */
if (unlikely(is_hyp_ctxt(vcpu)))
goto memory_read;
if (__vcpu_read_sys_reg_from_cpu(reg, &val))
return val;
memory_read:
return __vcpu_sys_reg(vcpu, reg);
}
void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg)
{
if (vcpu_get_flag(vcpu, SYSREGS_ON_CPU) &&
__vcpu_write_sys_reg_to_cpu(val, reg))
u64 (*xlate)(u64) = NULL;
unsigned int el1r;
if (!vcpu_get_flag(vcpu, SYSREGS_ON_CPU))
goto memory_write;
if (unlikely(get_el2_to_el1_mapping(reg, &el1r, &xlate))) {
if (!is_hyp_ctxt(vcpu))
goto memory_write;
/*
* Always store a copy of the write to memory to avoid having
* to reverse-translate virtual EL2 system registers for a
* non-VHE guest hypervisor.
*/
__vcpu_sys_reg(vcpu, reg) = val;
/* No EL1 counterpart? We're done here.? */
if (reg == el1r)
return;
if (!vcpu_el2_e2h_is_set(vcpu) && xlate)
val = xlate(val);
/* Redirect this to the EL1 version of the register. */
WARN_ON(!__vcpu_write_sys_reg_to_cpu(val, el1r));
return;
}
/* EL1 register can't be on the CPU if the guest is in vEL2. */
if (unlikely(is_hyp_ctxt(vcpu)))
goto memory_write;
if (__vcpu_write_sys_reg_to_cpu(val, reg))
return;
memory_write:
__vcpu_sys_reg(vcpu, reg) = val;
}
@ -1505,8 +1631,6 @@ static bool access_id_reg(struct kvm_vcpu *vcpu,
return write_to_read_only(vcpu, p, r);
p->regval = read_id_reg(vcpu, r);
if (vcpu_has_nv(vcpu))
access_nested_id_reg(vcpu, p, r);
return true;
}
@ -1885,6 +2009,32 @@ static unsigned int el2_visibility(const struct kvm_vcpu *vcpu,
return REG_HIDDEN;
}
static bool bad_vncr_trap(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
/*
* We really shouldn't be here, and this is likely the result
* of a misconfigured trap, as this register should target the
* VNCR page, and nothing else.
*/
return bad_trap(vcpu, p, r,
"trap of VNCR-backed register");
}
static bool bad_redir_trap(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
/*
* We really shouldn't be here, and this is likely the result
* of a misconfigured trap, as this register should target the
* corresponding EL1, and nothing else.
*/
return bad_trap(vcpu, p, r,
"trap of EL2 register redirected to EL1");
}
#define EL2_REG(name, acc, rst, v) { \
SYS_DESC(SYS_##name), \
.access = acc, \
@ -1894,6 +2044,9 @@ static unsigned int el2_visibility(const struct kvm_vcpu *vcpu,
.val = v, \
}
#define EL2_REG_VNCR(name, rst, v) EL2_REG(name, bad_vncr_trap, rst, v)
#define EL2_REG_REDIR(name, rst, v) EL2_REG(name, bad_redir_trap, rst, v)
/*
* EL{0,1}2 registers are the EL2 view on an EL0 or EL1 register when
* HCR_EL2.E2H==1, and only in the sysreg table for convenience of
@ -2508,32 +2661,33 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ PMU_SYS_REG(PMCCFILTR_EL0), .access = access_pmu_evtyper,
.reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 },
EL2_REG(VPIDR_EL2, access_rw, reset_unknown, 0),
EL2_REG(VMPIDR_EL2, access_rw, reset_unknown, 0),
EL2_REG_VNCR(VPIDR_EL2, reset_unknown, 0),
EL2_REG_VNCR(VMPIDR_EL2, reset_unknown, 0),
EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1),
EL2_REG(ACTLR_EL2, access_rw, reset_val, 0),
EL2_REG(HCR_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(HCR_EL2, reset_val, 0),
EL2_REG(MDCR_EL2, access_rw, reset_val, 0),
EL2_REG(CPTR_EL2, access_rw, reset_val, CPTR_NVHE_EL2_RES1),
EL2_REG(HSTR_EL2, access_rw, reset_val, 0),
EL2_REG(HFGRTR_EL2, access_rw, reset_val, 0),
EL2_REG(HFGWTR_EL2, access_rw, reset_val, 0),
EL2_REG(HFGITR_EL2, access_rw, reset_val, 0),
EL2_REG(HACR_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(HSTR_EL2, reset_val, 0),
EL2_REG_VNCR(HFGRTR_EL2, reset_val, 0),
EL2_REG_VNCR(HFGWTR_EL2, reset_val, 0),
EL2_REG_VNCR(HFGITR_EL2, reset_val, 0),
EL2_REG_VNCR(HACR_EL2, reset_val, 0),
EL2_REG(HCRX_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(HCRX_EL2, reset_val, 0),
EL2_REG(TTBR0_EL2, access_rw, reset_val, 0),
EL2_REG(TTBR1_EL2, access_rw, reset_val, 0),
EL2_REG(TCR_EL2, access_rw, reset_val, TCR_EL2_RES1),
EL2_REG(VTTBR_EL2, access_rw, reset_val, 0),
EL2_REG(VTCR_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(VTTBR_EL2, reset_val, 0),
EL2_REG_VNCR(VTCR_EL2, reset_val, 0),
{ SYS_DESC(SYS_DACR32_EL2), trap_undef, reset_unknown, DACR32_EL2 },
EL2_REG(HDFGRTR_EL2, access_rw, reset_val, 0),
EL2_REG(HDFGWTR_EL2, access_rw, reset_val, 0),
EL2_REG(SPSR_EL2, access_rw, reset_val, 0),
EL2_REG(ELR_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(HDFGRTR_EL2, reset_val, 0),
EL2_REG_VNCR(HDFGWTR_EL2, reset_val, 0),
EL2_REG_VNCR(HAFGRTR_EL2, reset_val, 0),
EL2_REG_REDIR(SPSR_EL2, reset_val, 0),
EL2_REG_REDIR(ELR_EL2, reset_val, 0),
{ SYS_DESC(SYS_SP_EL1), access_sp_el1},
/* AArch32 SPSR_* are RES0 if trapped from a NV guest */
@ -2549,10 +2703,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_IFSR32_EL2), trap_undef, reset_unknown, IFSR32_EL2 },
EL2_REG(AFSR0_EL2, access_rw, reset_val, 0),
EL2_REG(AFSR1_EL2, access_rw, reset_val, 0),
EL2_REG(ESR_EL2, access_rw, reset_val, 0),
EL2_REG_REDIR(ESR_EL2, reset_val, 0),
{ SYS_DESC(SYS_FPEXC32_EL2), trap_undef, reset_val, FPEXC32_EL2, 0x700 },
EL2_REG(FAR_EL2, access_rw, reset_val, 0),
EL2_REG_REDIR(FAR_EL2, reset_val, 0),
EL2_REG(HPFAR_EL2, access_rw, reset_val, 0),
EL2_REG(MAIR_EL2, access_rw, reset_val, 0),
@ -2565,24 +2719,9 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG(CONTEXTIDR_EL2, access_rw, reset_val, 0),
EL2_REG(TPIDR_EL2, access_rw, reset_val, 0),
EL2_REG(CNTVOFF_EL2, access_rw, reset_val, 0),
EL2_REG_VNCR(CNTVOFF_EL2, reset_val, 0),
EL2_REG(CNTHCTL_EL2, access_rw, reset_val, 0),
EL12_REG(SCTLR, access_vm_reg, reset_val, 0x00C50078),
EL12_REG(CPACR, access_rw, reset_val, 0),
EL12_REG(TTBR0, access_vm_reg, reset_unknown, 0),
EL12_REG(TTBR1, access_vm_reg, reset_unknown, 0),
EL12_REG(TCR, access_vm_reg, reset_val, 0),
{ SYS_DESC(SYS_SPSR_EL12), access_spsr},
{ SYS_DESC(SYS_ELR_EL12), access_elr},
EL12_REG(AFSR0, access_vm_reg, reset_unknown, 0),
EL12_REG(AFSR1, access_vm_reg, reset_unknown, 0),
EL12_REG(ESR, access_vm_reg, reset_unknown, 0),
EL12_REG(FAR, access_vm_reg, reset_unknown, 0),
EL12_REG(MAIR, access_vm_reg, reset_unknown, 0),
EL12_REG(AMAIR, access_vm_reg, reset_amair_el1, 0),
EL12_REG(VBAR, access_rw, reset_val, 0),
EL12_REG(CONTEXTIDR, access_vm_reg, reset_val, 0),
EL12_REG(CNTKCTL, access_rw, reset_val, 0),
EL2_REG(SP_EL2, NULL, reset_unknown, 0),

5
arch/arm64/kvm/vgic/vgic-its.c
View File

@ -590,7 +590,11 @@ static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
unsigned long flags;
raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
irq = __vgic_its_check_cache(dist, db, devid, eventid);
if (irq)
vgic_get_irq_kref(irq);
raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
return irq;
@ -769,6 +773,7 @@ int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi)
raw_spin_lock_irqsave(&irq->irq_lock, flags);
irq->pending_latch = true;
vgic_queue_irq_unlock(kvm, irq, flags);
vgic_put_irq(kvm, irq);
return 0;
}

28
arch/arm64/kvm/vgic/vgic-mmio-v3.c
View File

@ -357,31 +357,13 @@ static int vgic_v3_uaccess_write_pending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
int i;
unsigned long flags;
int ret;
for (i = 0; i < len * 8; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
ret = vgic_uaccess_write_spending(vcpu, addr, len, val);
if (ret)
return ret;
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (test_bit(i, &val)) {
/*
* pending_latch is set irrespective of irq type
* (level or edge) to avoid dependency that VM should
* restore irq config before pending info.
*/
irq->pending_latch = true;
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
} else {
irq->pending_latch = false;
raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
}
vgic_put_irq(vcpu->kvm, irq);
}
return 0;
return vgic_uaccess_write_cpending(vcpu, addr, len, ~val);
}
/* We want to avoid outer shareable. */

99
arch/arm64/kvm/vgic/vgic-mmio.c
View File

@ -301,9 +301,8 @@ static bool is_vgic_v2_sgi(struct kvm_vcpu *vcpu, struct vgic_irq *irq)
vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2);
}
void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
static void __set_pending(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len,
unsigned long val, bool is_user)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
int i;
@ -312,14 +311,22 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
/* GICD_ISPENDR0 SGI bits are WI */
if (is_vgic_v2_sgi(vcpu, irq)) {
/* GICD_ISPENDR0 SGI bits are WI when written from the guest. */
if (is_vgic_v2_sgi(vcpu, irq) && !is_user) {
vgic_put_irq(vcpu->kvm, irq);
continue;
}
raw_spin_lock_irqsave(&irq->irq_lock, flags);
/*
* GICv2 SGIs are terribly broken. We can't restore
* the source of the interrupt, so just pick the vcpu
* itself as the source...
*/
if (is_vgic_v2_sgi(vcpu, irq))
irq->source |= BIT(vcpu->vcpu_id);
if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
/* HW SGI? Ask the GIC to inject it */
int err;
@ -335,7 +342,7 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
}
irq->pending_latch = true;
if (irq->hw)
if (irq->hw && !is_user)
vgic_irq_set_phys_active(irq, true);
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
@ -343,33 +350,18 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
}
}
void vgic_mmio_write_spending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
__set_pending(vcpu, addr, len, val, false);
}
int vgic_uaccess_write_spending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
int i;
unsigned long flags;
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
irq->pending_latch = true;
/*
* GICv2 SGIs are terribly broken. We can't restore
* the source of the interrupt, so just pick the vcpu
* itself as the source...
*/
if (is_vgic_v2_sgi(vcpu, irq))
irq->source |= BIT(vcpu->vcpu_id);
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);
vgic_put_irq(vcpu->kvm, irq);
}
__set_pending(vcpu, addr, len, val, true);
return 0;
}
@ -394,9 +386,9 @@ static void vgic_hw_irq_cpending(struct kvm_vcpu *vcpu, struct vgic_irq *irq)
vgic_irq_set_phys_active(irq, false);
}
void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
static void __clear_pending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
unsigned long val, bool is_user)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
int i;
@ -405,14 +397,22 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
/* GICD_ICPENDR0 SGI bits are WI */
if (is_vgic_v2_sgi(vcpu, irq)) {
/* GICD_ICPENDR0 SGI bits are WI when written from the guest. */
if (is_vgic_v2_sgi(vcpu, irq) && !is_user) {
vgic_put_irq(vcpu->kvm, irq);
continue;
}
raw_spin_lock_irqsave(&irq->irq_lock, flags);
/*
* More fun with GICv2 SGIs! If we're clearing one of them
* from userspace, which source vcpu to clear? Let's not
* even think of it, and blow the whole set.
*/
if (is_vgic_v2_sgi(vcpu, irq))
irq->source = 0;
if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
/* HW SGI? Ask the GIC to clear its pending bit */
int err;
@ -427,7 +427,7 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
continue;
}
if (irq->hw)
if (irq->hw && !is_user)
vgic_hw_irq_cpending(vcpu, irq);
else
irq->pending_latch = false;
@ -437,33 +437,18 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
}
}
void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
__clear_pending(vcpu, addr, len, val, false);
}
int vgic_uaccess_write_cpending(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 intid = VGIC_ADDR_TO_INTID(addr, 1);
int i;
unsigned long flags;
for_each_set_bit(i, &val, len * 8) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
/*
* More fun with GICv2 SGIs! If we're clearing one of them
* from userspace, which source vcpu to clear? Let's not
* even think of it, and blow the whole set.
*/
if (is_vgic_v2_sgi(vcpu, irq))
irq->source = 0;
irq->pending_latch = false;
raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
vgic_put_irq(vcpu->kvm, irq);
}
__clear_pending(vcpu, addr, len, val, true);
return 0;
}

25
arch/loongarch/include/asm/kvm_host.h
View File

@ -45,7 +45,10 @@ struct kvm_vcpu_stat {
u64 signal_exits;
};
#define KVM_MEM_HUGEPAGE_CAPABLE (1UL << 0)
#define KVM_MEM_HUGEPAGE_INCAPABLE (1UL << 1)
struct kvm_arch_memory_slot {
unsigned long flags;
};
struct kvm_context {
@ -92,8 +95,10 @@ enum emulation_result {
};
#define KVM_LARCH_FPU (0x1 << 0)
#define KVM_LARCH_SWCSR_LATEST (0x1 << 1)
#define KVM_LARCH_HWCSR_USABLE (0x1 << 2)
#define KVM_LARCH_LSX (0x1 << 1)
#define KVM_LARCH_LASX (0x1 << 2)
#define KVM_LARCH_SWCSR_LATEST (0x1 << 3)
#define KVM_LARCH_HWCSR_USABLE (0x1 << 4)
struct kvm_vcpu_arch {
/*
@ -175,6 +180,21 @@ static inline void writel_sw_gcsr(struct loongarch_csrs *csr, int reg, unsigned
csr->csrs[reg] = val;
}
static inline bool kvm_guest_has_fpu(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_FP;
}
static inline bool kvm_guest_has_lsx(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_LSX;
}
static inline bool kvm_guest_has_lasx(struct kvm_vcpu_arch *arch)
{
return arch->cpucfg[2] & CPUCFG2_LASX;
}
/* Debug: dump vcpu state */
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
@ -183,7 +203,6 @@ void kvm_flush_tlb_all(void);
void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa);
int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write);
#define KVM_ARCH_WANT_MMU_NOTIFIER
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end, bool blockable);
int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);

21
arch/loongarch/include/asm/kvm_vcpu.h
View File

@ -55,7 +55,26 @@ void kvm_save_fpu(struct loongarch_fpu *fpu);
void kvm_restore_fpu(struct loongarch_fpu *fpu);
void kvm_restore_fcsr(struct loongarch_fpu *fpu);
void kvm_acquire_timer(struct kvm_vcpu *vcpu);
#ifdef CONFIG_CPU_HAS_LSX
int kvm_own_lsx(struct kvm_vcpu *vcpu);
void kvm_save_lsx(struct loongarch_fpu *fpu);
void kvm_restore_lsx(struct loongarch_fpu *fpu);
#else
static inline int kvm_own_lsx(struct kvm_vcpu *vcpu) { }
static inline void kvm_save_lsx(struct loongarch_fpu *fpu) { }
static inline void kvm_restore_lsx(struct loongarch_fpu *fpu) { }
#endif
#ifdef CONFIG_CPU_HAS_LASX
int kvm_own_lasx(struct kvm_vcpu *vcpu);
void kvm_save_lasx(struct loongarch_fpu *fpu);
void kvm_restore_lasx(struct loongarch_fpu *fpu);
#else
static inline int kvm_own_lasx(struct kvm_vcpu *vcpu) { }
static inline void kvm_save_lasx(struct loongarch_fpu *fpu) { }
static inline void kvm_restore_lasx(struct loongarch_fpu *fpu) { }
#endif
void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long hz);
void kvm_reset_timer(struct kvm_vcpu *vcpu);
void kvm_save_timer(struct kvm_vcpu *vcpu);

1
arch/loongarch/include/uapi/asm/kvm.h
View File

@ -79,6 +79,7 @@ struct kvm_fpu {
#define LOONGARCH_REG_64(TYPE, REG) (TYPE | KVM_REG_SIZE_U64 | (REG << LOONGARCH_REG_SHIFT))
#define KVM_IOC_CSRID(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CSR, REG)
#define KVM_IOC_CPUCFG(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CPUCFG, REG)
#define KVM_LOONGARCH_VCPU_CPUCFG 0
struct kvm_debug_exit_arch {
};

2
arch/loongarch/kernel/fpu.S
View File

@ -349,6 +349,7 @@ SYM_FUNC_START(_restore_lsx_upper)
lsx_restore_all_upper a0 t0 t1
jr ra
SYM_FUNC_END(_restore_lsx_upper)
EXPORT_SYMBOL(_restore_lsx_upper)
SYM_FUNC_START(_init_lsx_upper)
lsx_init_all_upper t1
@ -384,6 +385,7 @@ SYM_FUNC_START(_restore_lasx_upper)
lasx_restore_all_upper a0 t0 t1
jr ra
SYM_FUNC_END(_restore_lasx_upper)
EXPORT_SYMBOL(_restore_lasx_upper)
SYM_FUNC_START(_init_lasx_upper)
lasx_init_all_upper t1

5
arch/loongarch/kvm/Kconfig
View File

@ -22,14 +22,13 @@ config KVM
depends on AS_HAS_LVZ_EXTENSION
depends on HAVE_KVM
select HAVE_KVM_DIRTY_RING_ACQ_REL
select HAVE_KVM_EVENTFD
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_GENERIC_MMU_NOTIFIER
select KVM_MMIO
select KVM_XFER_TO_GUEST_WORK
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
help
Support hosting virtualized guest machines using
hardware virtualization extensions. You will need

50
arch/loongarch/kvm/exit.c
View File

@ -200,17 +200,8 @@ int kvm_emu_idle(struct kvm_vcpu *vcpu)
++vcpu->stat.idle_exits;
trace_kvm_exit_idle(vcpu, KVM_TRACE_EXIT_IDLE);
if (!kvm_arch_vcpu_runnable(vcpu)) {
/*
* Switch to the software timer before halt-polling/blocking as
* the guest's timer may be a break event for the vCPU, and the
* hypervisor timer runs only when the CPU is in guest mode.
* Switch before halt-polling so that KVM recognizes an expired
* timer before blocking.
*/
kvm_save_timer(vcpu);
kvm_vcpu_block(vcpu);
}
if (!kvm_arch_vcpu_runnable(vcpu))
kvm_vcpu_halt(vcpu);
return EMULATE_DONE;
}
@ -643,6 +634,11 @@ static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
if (!kvm_guest_has_fpu(&vcpu->arch)) {
kvm_queue_exception(vcpu, EXCCODE_INE, 0);
return RESUME_GUEST;
}
/*
* If guest FPU not present, the FPU operation should have been
* treated as a reserved instruction!
@ -659,6 +655,36 @@ static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
return RESUME_GUEST;
}
/*
* kvm_handle_lsx_disabled() - Guest used LSX while disabled in root.
* @vcpu: Virtual CPU context.
*
* Handle when the guest attempts to use LSX when it is disabled in the root
* context.
*/
static int kvm_handle_lsx_disabled(struct kvm_vcpu *vcpu)
{
if (kvm_own_lsx(vcpu))
kvm_queue_exception(vcpu, EXCCODE_INE, 0);
return RESUME_GUEST;
}
/*
* kvm_handle_lasx_disabled() - Guest used LASX while disabled in root.
* @vcpu: Virtual CPU context.
*
* Handle when the guest attempts to use LASX when it is disabled in the root
* context.
*/
static int kvm_handle_lasx_disabled(struct kvm_vcpu *vcpu)
{
if (kvm_own_lasx(vcpu))
kvm_queue_exception(vcpu, EXCCODE_INE, 0);
return RESUME_GUEST;
}
/*
* LoongArch KVM callback handling for unimplemented guest exiting
*/
@ -687,6 +713,8 @@ static exit_handle_fn kvm_fault_tables[EXCCODE_INT_START] = {
[EXCCODE_TLBS] = kvm_handle_write_fault,
[EXCCODE_TLBM] = kvm_handle_write_fault,
[EXCCODE_FPDIS] = kvm_handle_fpu_disabled,
[EXCCODE_LSXDIS] = kvm_handle_lsx_disabled,
[EXCCODE_LASXDIS] = kvm_handle_lasx_disabled,
[EXCCODE_GSPR] = kvm_handle_gspr,
};

1
arch/loongarch/kvm/main.c
View File

@ -287,7 +287,6 @@ int kvm_arch_hardware_enable(void)
if (env & CSR_GCFG_MATC_ROOT)
gcfg |= CSR_GCFG_MATC_ROOT;
gcfg |= CSR_GCFG_TIT;
write_csr_gcfg(gcfg);
kvm_flush_tlb_all();

124
arch/loongarch/kvm/mmu.c
View File

@ -13,6 +13,16 @@
#include <asm/tlb.h>
#include <asm/kvm_mmu.h>
static inline bool kvm_hugepage_capable(struct kvm_memory_slot *slot)
{
return slot->arch.flags & KVM_MEM_HUGEPAGE_CAPABLE;
}
static inline bool kvm_hugepage_incapable(struct kvm_memory_slot *slot)
{
return slot->arch.flags & KVM_MEM_HUGEPAGE_INCAPABLE;
}
static inline void kvm_ptw_prepare(struct kvm *kvm, kvm_ptw_ctx *ctx)
{
ctx->level = kvm->arch.root_level;
@ -365,6 +375,69 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
kvm_ptw_top(kvm->arch.pgd, start << PAGE_SHIFT, end << PAGE_SHIFT, &ctx);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_memory_slot *old,
struct kvm_memory_slot *new, enum kvm_mr_change change)
{
gpa_t gpa_start;
hva_t hva_start;
size_t size, gpa_offset, hva_offset;
if ((change != KVM_MR_MOVE) && (change != KVM_MR_CREATE))
return 0;
/*
* Prevent userspace from creating a memory region outside of the
* VM GPA address space
*/
if ((new->base_gfn + new->npages) > (kvm->arch.gpa_size >> PAGE_SHIFT))
return -ENOMEM;
new->arch.flags = 0;
size = new->npages * PAGE_SIZE;
gpa_start = new->base_gfn << PAGE_SHIFT;
hva_start = new->userspace_addr;
if (IS_ALIGNED(size, PMD_SIZE) && IS_ALIGNED(gpa_start, PMD_SIZE)
&& IS_ALIGNED(hva_start, PMD_SIZE))
new->arch.flags |= KVM_MEM_HUGEPAGE_CAPABLE;
else {
/*
* Pages belonging to memslots that don't have the same
* alignment within a PMD for userspace and GPA cannot be
* mapped with PMD entries, because we'll end up mapping
* the wrong pages.
*
* Consider a layout like the following:
*
* memslot->userspace_addr:
* +-----+--------------------+--------------------+---+
* |abcde|fgh Stage-1 block | Stage-1 block tv|xyz|
* +-----+--------------------+--------------------+---+
*
* memslot->base_gfn << PAGE_SIZE:
* +---+--------------------+--------------------+-----+
* |abc|def Stage-2 block | Stage-2 block |tvxyz|
* +---+--------------------+--------------------+-----+
*
* If we create those stage-2 blocks, we'll end up with this
* incorrect mapping:
* d -> f
* e -> g
* f -> h
*/
gpa_offset = gpa_start & (PMD_SIZE - 1);
hva_offset = hva_start & (PMD_SIZE - 1);
if (gpa_offset != hva_offset) {
new->arch.flags |= KVM_MEM_HUGEPAGE_INCAPABLE;
} else {
if (gpa_offset == 0)
gpa_offset = PMD_SIZE;
if ((size + gpa_offset) < (PMD_SIZE * 2))
new->arch.flags |= KVM_MEM_HUGEPAGE_INCAPABLE;
}
}
return 0;
}
void kvm_arch_commit_memory_region(struct kvm *kvm,
struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
@ -562,47 +635,23 @@ static int kvm_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa, bool writ
}
static bool fault_supports_huge_mapping(struct kvm_memory_slot *memslot,
unsigned long hva, unsigned long map_size, bool write)
unsigned long hva, bool write)
{
size_t size;
gpa_t gpa_start;
hva_t uaddr_start, uaddr_end;
hva_t start, end;
/* Disable dirty logging on HugePages */
if (kvm_slot_dirty_track_enabled(memslot) && write)
return false;
size = memslot->npages * PAGE_SIZE;
gpa_start = memslot->base_gfn << PAGE_SHIFT;
uaddr_start = memslot->userspace_addr;
uaddr_end = uaddr_start + size;
if (kvm_hugepage_capable(memslot))
return true;
/*
* Pages belonging to memslots that don't have the same alignment
* within a PMD for userspace and GPA cannot be mapped with stage-2
* PMD entries, because we'll end up mapping the wrong pages.
*
* Consider a layout like the following:
*
* memslot->userspace_addr:
* +-----+--------------------+--------------------+---+
* |abcde|fgh Stage-1 block | Stage-1 block tv|xyz|
* +-----+--------------------+--------------------+---+
*
* memslot->base_gfn << PAGE_SIZE:
* +---+--------------------+--------------------+-----+
* |abc|def Stage-2 block | Stage-2 block |tvxyz|
* +---+--------------------+--------------------+-----+
*
* If we create those stage-2 blocks, we'll end up with this incorrect
* mapping:
* d -> f
* e -> g
* f -> h
*/
if ((gpa_start & (map_size - 1)) != (uaddr_start & (map_size - 1)))
if (kvm_hugepage_incapable(memslot))
return false;
start = memslot->userspace_addr;
end = start + memslot->npages * PAGE_SIZE;
/*
* Next, let's make sure we're not trying to map anything not covered
* by the memslot. This means we have to prohibit block size mappings
@ -615,8 +664,7 @@ static bool fault_supports_huge_mapping(struct kvm_memory_slot *memslot,
* userspace_addr or the base_gfn, as both are equally aligned (per
* the check above) and equally sized.
*/
return (hva & ~(map_size - 1)) >= uaddr_start &&
(hva & ~(map_size - 1)) + map_size <= uaddr_end;
return (hva >= ALIGN(start, PMD_SIZE)) && (hva < ALIGN_DOWN(end, PMD_SIZE));
}
/*
@ -842,7 +890,7 @@ static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write)
/* Disable dirty logging on HugePages */
level = 0;
if (!fault_supports_huge_mapping(memslot, hva, PMD_SIZE, write)) {
if (!fault_supports_huge_mapping(memslot, hva, write)) {
level = 0;
} else {
level = host_pfn_mapping_level(kvm, gfn, memslot);
@ -901,12 +949,6 @@ void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
}
int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_memory_slot *old,
struct kvm_memory_slot *new, enum kvm_mr_change change)
{
return 0;
}
void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
const struct kvm_memory_slot *memslot)
{

31
arch/loongarch/kvm/switch.S
View File

@ -245,6 +245,37 @@ SYM_FUNC_START(kvm_restore_fpu)
jr ra
SYM_FUNC_END(kvm_restore_fpu)
#ifdef CONFIG_CPU_HAS_LSX
SYM_FUNC_START(kvm_save_lsx)
fpu_save_csr a0 t1
fpu_save_cc a0 t1 t2
lsx_save_data a0 t1
jr ra
SYM_FUNC_END(kvm_save_lsx)
SYM_FUNC_START(kvm_restore_lsx)
lsx_restore_data a0 t1
fpu_restore_cc a0 t1 t2
fpu_restore_csr a0 t1 t2
jr ra
SYM_FUNC_END(kvm_restore_lsx)
#endif
#ifdef CONFIG_CPU_HAS_LASX
SYM_FUNC_START(kvm_save_lasx)
fpu_save_csr a0 t1
fpu_save_cc a0 t1 t2
lasx_save_data a0 t1
jr ra
SYM_FUNC_END(kvm_save_lasx)
SYM_FUNC_START(kvm_restore_lasx)
lasx_restore_data a0 t1
fpu_restore_cc a0 t1 t2
fpu_restore_csr a0 t1 t2
jr ra
SYM_FUNC_END(kvm_restore_lasx)
#endif
.section ".rodata"
SYM_DATA(kvm_exception_size, .quad kvm_exc_entry_end - kvm_exc_entry)
SYM_DATA(kvm_enter_guest_size, .quad kvm_enter_guest_end - kvm_enter_guest)

105
arch/loongarch/kvm/timer.c
View File

@ -64,41 +64,24 @@ void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long timer_hz)
kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TVAL, 0);
}
/*
* Restore hard timer state and enable guest to access timer registers
* without trap, should be called with irq disabled
*/
void kvm_acquire_timer(struct kvm_vcpu *vcpu)
{
unsigned long cfg;
cfg = read_csr_gcfg();
if (!(cfg & CSR_GCFG_TIT))
return;
/* Enable guest access to hard timer */
write_csr_gcfg(cfg & ~CSR_GCFG_TIT);
/*
* Freeze the soft-timer and sync the guest stable timer with it. We do
* this with interrupts disabled to avoid latency.
*/
hrtimer_cancel(&vcpu->arch.swtimer);
}
/*
* Restore soft timer state from saved context.
*/
void kvm_restore_timer(struct kvm_vcpu *vcpu)
{
unsigned long cfg, delta, period;
unsigned long cfg, estat;
unsigned long ticks, delta, period;
ktime_t expire, now;
struct loongarch_csrs *csr = vcpu->arch.csr;
/*
* Set guest stable timer cfg csr
* Disable timer before restore estat CSR register, avoid to
* get invalid timer interrupt for old timer cfg
*/
cfg = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG);
write_gcsr_timercfg(0);
kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ESTAT);
kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TCFG);
if (!(cfg & CSR_TCFG_EN)) {
@ -107,24 +90,56 @@ void kvm_restore_timer(struct kvm_vcpu *vcpu)
return;
}
/*
* Freeze the soft-timer and sync the guest stable timer with it.
*/
hrtimer_cancel(&vcpu->arch.swtimer);
/*
* From LoongArch Reference Manual Volume 1 Chapter 7.6.2
* If oneshot timer is fired, CSR TVAL will be -1, there are two
* conditions:
* 1) timer is fired during exiting to host
* 2) timer is fired and vm is doing timer irq, and then exiting to
* host. Host should not inject timer irq to avoid spurious
* timer interrupt again
*/
ticks = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TVAL);
estat = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT);
if (!(cfg & CSR_TCFG_PERIOD) && (ticks > cfg)) {
/*
* Writing 0 to LOONGARCH_CSR_TVAL will inject timer irq
* and set CSR TVAL with -1
*/
write_gcsr_timertick(0);
/*
* Writing CSR_TINTCLR_TI to LOONGARCH_CSR_TINTCLR will clear
* timer interrupt, and CSR TVAL keeps unchanged with -1, it
* avoids spurious timer interrupt
*/
if (!(estat & CPU_TIMER))
gcsr_write(CSR_TINTCLR_TI, LOONGARCH_CSR_TINTCLR);
return;
}
/*
* Set remainder tick value if not expired
*/
delta = 0;
now = ktime_get();
expire = vcpu->arch.expire;
if (ktime_before(now, expire))
delta = ktime_to_tick(vcpu, ktime_sub(expire, now));
else {
if (cfg & CSR_TCFG_PERIOD) {
else if (cfg & CSR_TCFG_PERIOD) {
period = cfg & CSR_TCFG_VAL;
delta = ktime_to_tick(vcpu, ktime_sub(now, expire));
delta = period - (delta % period);
} else
delta = 0;
/*
* Inject timer here though sw timer should inject timer
* interrupt async already, since sw timer may be cancelled
* during injecting intr async in function kvm_acquire_timer
* during injecting intr async
*/
kvm_queue_irq(vcpu, INT_TI);
}
@ -139,27 +154,41 @@ void kvm_restore_timer(struct kvm_vcpu *vcpu)
*/
static void _kvm_save_timer(struct kvm_vcpu *vcpu)
{
unsigned long ticks, delta;
unsigned long ticks, delta, cfg;
ktime_t expire;
struct loongarch_csrs *csr = vcpu->arch.csr;
cfg = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG);
ticks = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TVAL);
/*
* From LoongArch Reference Manual Volume 1 Chapter 7.6.2
* If period timer is fired, CSR TVAL will be reloaded from CSR TCFG
* If oneshot timer is fired, CSR TVAL will be -1
* Here judge one-shot timer fired by checking whether TVAL is larger
* than TCFG
*/
if (ticks < cfg) {
delta = tick_to_ns(vcpu, ticks);
expire = ktime_add_ns(ktime_get(), delta);
vcpu->arch.expire = expire;
if (ticks) {
/*
* Update hrtimer to use new timeout
* HRTIMER_MODE_PINNED is suggested since vcpu may run in
* the same physical cpu in next time
*/
hrtimer_cancel(&vcpu->arch.swtimer);
hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
} else
} else if (vcpu->stat.generic.blocking) {
/*
* Inject timer interrupt so that hall polling can dectect and exit
* Inject timer interrupt so that halt polling can dectect and exit.
* VCPU is scheduled out already and sleeps in rcuwait queue and
* will not poll pending events again. kvm_queue_irq() is not enough,
* hrtimer swtimer should be used here.
*/
kvm_queue_irq(vcpu, INT_TI);
expire = ktime_add_ns(ktime_get(), 10);
vcpu->arch.expire = expire;
hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
}
}
/*
@ -168,21 +197,15 @@ static void _kvm_save_timer(struct kvm_vcpu *vcpu)
*/
void kvm_save_timer(struct kvm_vcpu *vcpu)
{
unsigned long cfg;
struct loongarch_csrs *csr = vcpu->arch.csr;
preempt_disable();
cfg = read_csr_gcfg();
if (!(cfg & CSR_GCFG_TIT)) {
/* Disable guest use of hard timer */
write_csr_gcfg(cfg | CSR_GCFG_TIT);
/* Save hard timer state */
kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TCFG);
kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TVAL);
if (kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG) & CSR_TCFG_EN)
_kvm_save_timer(vcpu);
}
/* Save timer-related state to vCPU context */
kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ESTAT);

6
arch/loongarch/kvm/trace.h
View File

@ -102,6 +102,8 @@ TRACE_EVENT(kvm_exit_gspr,
#define KVM_TRACE_AUX_DISCARD 4
#define KVM_TRACE_AUX_FPU 1
#define KVM_TRACE_AUX_LSX 2
#define KVM_TRACE_AUX_LASX 3
#define kvm_trace_symbol_aux_op \
{ KVM_TRACE_AUX_SAVE, "save" }, \
@ -111,7 +113,9 @@ TRACE_EVENT(kvm_exit_gspr,
{ KVM_TRACE_AUX_DISCARD, "discard" }
#define kvm_trace_symbol_aux_state \
{ KVM_TRACE_AUX_FPU, "FPU" }
{ KVM_TRACE_AUX_FPU, "FPU" }, \
{ KVM_TRACE_AUX_LSX, "LSX" }, \
{ KVM_TRACE_AUX_LASX, "LASX" }
TRACE_EVENT(kvm_aux,
TP_PROTO(struct kvm_vcpu *vcpu, unsigned int op,

305
arch/loongarch/kvm/vcpu.c
View File

@ -95,7 +95,6 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
* check vmid before vcpu enter guest
*/
local_irq_disable();
kvm_acquire_timer(vcpu);
kvm_deliver_intr(vcpu);
kvm_deliver_exception(vcpu);
/* Make sure the vcpu mode has been written */
@ -187,8 +186,15 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
return kvm_pending_timer(vcpu) ||
int ret;
/* Protect from TOD sync and vcpu_load/put() */
preempt_disable();
ret = kvm_pending_timer(vcpu) ||
kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) & (1 << INT_TI);
preempt_enable();
return ret;
}
int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
@ -244,23 +250,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
return -EINVAL;
}
/**
* kvm_migrate_count() - Migrate timer.
* @vcpu: Virtual CPU.
*
* Migrate hrtimer to the current CPU by cancelling and restarting it
* if the hrtimer is active.
*
* Must be called when the vCPU is migrated to a different CPU, so that
* the timer can interrupt the guest at the new CPU, and the timer irq can
* be delivered to the vCPU.
*/
static void kvm_migrate_count(struct kvm_vcpu *vcpu)
{
if (hrtimer_cancel(&vcpu->arch.swtimer))
hrtimer_restart(&vcpu->arch.swtimer);
}
static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val)
{
unsigned long gintc;
@ -309,6 +298,76 @@ static int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val)
return ret;
}
static int _kvm_get_cpucfg(int id, u64 *v)
{
int ret = 0;
if (id < 0 && id >= KVM_MAX_CPUCFG_REGS)
return -EINVAL;
switch (id) {
case 2:
/* Return CPUCFG2 features which have been supported by KVM */
*v = CPUCFG2_FP | CPUCFG2_FPSP | CPUCFG2_FPDP |
CPUCFG2_FPVERS | CPUCFG2_LLFTP | CPUCFG2_LLFTPREV |
CPUCFG2_LAM;
/*
* If LSX is supported by CPU, it is also supported by KVM,
* as we implement it.
*/
if (cpu_has_lsx)
*v |= CPUCFG2_LSX;
/*
* if LASX is supported by CPU, it is also supported by KVM,
* as we implement it.
*/
if (cpu_has_lasx)
*v |= CPUCFG2_LASX;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int kvm_check_cpucfg(int id, u64 val)
{
u64 mask;
int ret = 0;
if (id < 0 && id >= KVM_MAX_CPUCFG_REGS)
return -EINVAL;
if (_kvm_get_cpucfg(id, &mask))
return ret;
switch (id) {
case 2:
/* CPUCFG2 features checking */
if (val & ~mask)
/* The unsupported features should not be set */
ret = -EINVAL;
else if (!(val & CPUCFG2_LLFTP))
/* The LLFTP must be set, as guest must has a constant timer */
ret = -EINVAL;
else if ((val & CPUCFG2_FP) && (!(val & CPUCFG2_FPSP) || !(val & CPUCFG2_FPDP)))
/* Single and double float point must both be set when enable FP */
ret = -EINVAL;
else if ((val & CPUCFG2_LSX) && !(val & CPUCFG2_FP))
/* FP should be set when enable LSX */
ret = -EINVAL;
else if ((val & CPUCFG2_LASX) && !(val & CPUCFG2_LSX))
/* LSX, FP should be set when enable LASX, and FP has been checked before. */
ret = -EINVAL;
break;
default:
break;
}
return ret;
}
static int kvm_get_one_reg(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg, u64 *v)
{
@ -378,10 +437,10 @@ static int kvm_set_one_reg(struct kvm_vcpu *vcpu,
break;
case KVM_REG_LOONGARCH_CPUCFG:
id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
ret = kvm_check_cpucfg(id, v);
if (ret)
break;
vcpu->arch.cpucfg[id] = (u32)v;
else
ret = -EINVAL;
break;
case KVM_REG_LOONGARCH_KVM:
switch (reg->id) {
@ -471,10 +530,94 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
return -EINVAL;
}
static int kvm_loongarch_cpucfg_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
switch (attr->attr) {
case 2:
return 0;
default:
return -ENXIO;
}
return -ENXIO;
}
static int kvm_loongarch_vcpu_has_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
int ret = -ENXIO;
switch (attr->group) {
case KVM_LOONGARCH_VCPU_CPUCFG:
ret = kvm_loongarch_cpucfg_has_attr(vcpu, attr);
break;
default:
break;
}
return ret;
}
static int kvm_loongarch_get_cpucfg_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
int ret = 0;
uint64_t val;
uint64_t __user *uaddr = (uint64_t __user *)attr->addr;
ret = _kvm_get_cpucfg(attr->attr, &val);
if (ret)
return ret;
put_user(val, uaddr);
return ret;
}
static int kvm_loongarch_vcpu_get_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
int ret = -ENXIO;
switch (attr->group) {
case KVM_LOONGARCH_VCPU_CPUCFG:
ret = kvm_loongarch_get_cpucfg_attr(vcpu, attr);
break;
default:
break;
}
return ret;
}
static int kvm_loongarch_cpucfg_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
return -ENXIO;
}
static int kvm_loongarch_vcpu_set_attr(struct kvm_vcpu *vcpu,
struct kvm_device_attr *attr)
{
int ret = -ENXIO;
switch (attr->group) {
case KVM_LOONGARCH_VCPU_CPUCFG:
ret = kvm_loongarch_cpucfg_set_attr(vcpu, attr);
break;
default:
break;
}
return ret;
}
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
long r;
struct kvm_device_attr attr;
void __user *argp = (void __user *)arg;
struct kvm_vcpu *vcpu = filp->private_data;
@ -514,6 +657,27 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
break;
}
case KVM_HAS_DEVICE_ATTR: {
r = -EFAULT;
if (copy_from_user(&attr, argp, sizeof(attr)))
break;
r = kvm_loongarch_vcpu_has_attr(vcpu, &attr);
break;
}
case KVM_GET_DEVICE_ATTR: {
r = -EFAULT;
if (copy_from_user(&attr, argp, sizeof(attr)))
break;
r = kvm_loongarch_vcpu_get_attr(vcpu, &attr);
break;
}
case KVM_SET_DEVICE_ATTR: {
r = -EFAULT;
if (copy_from_user(&attr, argp, sizeof(attr)))
break;
r = kvm_loongarch_vcpu_set_attr(vcpu, &attr);
break;
}
default:
r = -ENOIOCTLCMD;
break;
@ -561,12 +725,96 @@ void kvm_own_fpu(struct kvm_vcpu *vcpu)
preempt_enable();
}
#ifdef CONFIG_CPU_HAS_LSX
/* Enable LSX and restore context */
int kvm_own_lsx(struct kvm_vcpu *vcpu)
{
if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch))
return -EINVAL;
preempt_disable();
/* Enable LSX for guest */
set_csr_euen(CSR_EUEN_LSXEN | CSR_EUEN_FPEN);
switch (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
case KVM_LARCH_FPU:
/*
* Guest FPU state already loaded,
* only restore upper LSX state
*/
_restore_lsx_upper(&vcpu->arch.fpu);
break;
default:
/* Neither FP or LSX already active,
* restore full LSX state
*/
kvm_restore_lsx(&vcpu->arch.fpu);
break;
}
trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LSX);
vcpu->arch.aux_inuse |= KVM_LARCH_LSX | KVM_LARCH_FPU;
preempt_enable();
return 0;
}
#endif
#ifdef CONFIG_CPU_HAS_LASX
/* Enable LASX and restore context */
int kvm_own_lasx(struct kvm_vcpu *vcpu)
{
if (!kvm_guest_has_fpu(&vcpu->arch) || !kvm_guest_has_lsx(&vcpu->arch) || !kvm_guest_has_lasx(&vcpu->arch))
return -EINVAL;
preempt_disable();
set_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN);
switch (vcpu->arch.aux_inuse & (KVM_LARCH_FPU | KVM_LARCH_LSX)) {
case KVM_LARCH_LSX:
case KVM_LARCH_LSX | KVM_LARCH_FPU:
/* Guest LSX state already loaded, only restore upper LASX state */
_restore_lasx_upper(&vcpu->arch.fpu);
break;
case KVM_LARCH_FPU:
/* Guest FP state already loaded, only restore upper LSX & LASX state */
_restore_lsx_upper(&vcpu->arch.fpu);
_restore_lasx_upper(&vcpu->arch.fpu);
break;
default:
/* Neither FP or LSX already active, restore full LASX state */
kvm_restore_lasx(&vcpu->arch.fpu);
break;
}
trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_LASX);
vcpu->arch.aux_inuse |= KVM_LARCH_LASX | KVM_LARCH_LSX | KVM_LARCH_FPU;
preempt_enable();
return 0;
}
#endif
/* Save context and disable FPU */
void kvm_lose_fpu(struct kvm_vcpu *vcpu)
{
preempt_disable();
if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
if (vcpu->arch.aux_inuse & KVM_LARCH_LASX) {
kvm_save_lasx(&vcpu->arch.fpu);
vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU | KVM_LARCH_LASX);
trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LASX);
/* Disable LASX & LSX & FPU */
clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN | CSR_EUEN_LASXEN);
} else if (vcpu->arch.aux_inuse & KVM_LARCH_LSX) {
kvm_save_lsx(&vcpu->arch.fpu);
vcpu->arch.aux_inuse &= ~(KVM_LARCH_LSX | KVM_LARCH_FPU);
trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_LSX);
/* Disable LSX & FPU */
clear_csr_euen(CSR_EUEN_FPEN | CSR_EUEN_LSXEN);
} else if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
kvm_save_fpu(&vcpu->arch.fpu);
vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU;
trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);
@ -789,17 +1037,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
unsigned long flags;
local_irq_save(flags);
if (vcpu->arch.last_sched_cpu != cpu) {
kvm_debug("[%d->%d]KVM vCPU[%d] switch\n",
vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
/*
* Migrate the timer interrupt to the current CPU so that it
* always interrupts the guest and synchronously triggers a
* guest timer interrupt.
*/
kvm_migrate_count(vcpu);
}
/* Restore guest state to registers */
_kvm_vcpu_load(vcpu, cpu);
local_irq_restore(flags);

2
arch/mips/include/asm/kvm_host.h
View File

@ -810,8 +810,6 @@ int kvm_mips_mkclean_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
pgd_t *kvm_pgd_alloc(void);
void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
#define KVM_ARCH_WANT_MMU_NOTIFIER
/* Emulation */
enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);

6
arch/mips/kvm/Kconfig
View File

@ -20,13 +20,11 @@ config KVM
depends on HAVE_KVM
depends on MIPS_FP_SUPPORT
select EXPORT_UASM
select PREEMPT_NOTIFIERS
select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select HAVE_KVM_EVENTFD
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_MMIO
select MMU_NOTIFIER
select INTERVAL_TREE
select KVM_GENERIC_MMU_NOTIFIER
select KVM_GENERIC_HARDWARE_ENABLING
help
Support for hosting Guest kernels.

2
arch/powerpc/include/asm/kvm_host.h
View File

@ -63,8 +63,6 @@
#include <linux/mmu_notifier.h>
#define KVM_ARCH_WANT_MMU_NOTIFIER
#define HPTEG_CACHE_NUM (1 << 15)
#define HPTEG_HASH_BITS_PTE 13
#define HPTEG_HASH_BITS_PTE_LONG 12

14
arch/powerpc/kvm/Kconfig
View File

@ -19,13 +19,11 @@ if VIRTUALIZATION
config KVM
bool
select PREEMPT_NOTIFIERS
select HAVE_KVM_EVENTFD
select KVM_COMMON
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_VFIO
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
select INTERVAL_TREE
config KVM_BOOK3S_HANDLER
bool
@ -42,7 +40,7 @@ config KVM_BOOK3S_64_HANDLER
config KVM_BOOK3S_PR_POSSIBLE
bool
select KVM_MMIO
select MMU_NOTIFIER
select KVM_GENERIC_MMU_NOTIFIER
config KVM_BOOK3S_HV_POSSIBLE
bool
@ -85,7 +83,7 @@ config KVM_BOOK3S_64_HV
tristate "KVM for POWER7 and later using hypervisor mode in host"
depends on KVM_BOOK3S_64 && PPC_POWERNV
select KVM_BOOK3S_HV_POSSIBLE
select MMU_NOTIFIER
select KVM_GENERIC_MMU_NOTIFIER
select CMA
help
Support running unmodified book3s_64 guest kernels in
@ -194,7 +192,7 @@ config KVM_E500V2
depends on !CONTEXT_TRACKING_USER
select KVM
select KVM_MMIO
select MMU_NOTIFIER
select KVM_GENERIC_MMU_NOTIFIER
help
Support running unmodified E500 guest kernels in virtual machines on
E500v2 host processors.
@ -211,7 +209,7 @@ config KVM_E500MC
select KVM
select KVM_MMIO
select KVM_BOOKE_HV
select MMU_NOTIFIER
select KVM_GENERIC_MMU_NOTIFIER
help
Support running unmodified E500MC/E5500/E6500 guest kernels in
virtual machines on E500MC/E5500/E6500 host processors.
@ -225,7 +223,6 @@ config KVM_MPIC
bool "KVM in-kernel MPIC emulation"
depends on KVM && PPC_E500
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_MSI
help
@ -238,7 +235,6 @@ config KVM_XICS
bool "KVM in-kernel XICS emulation"
depends on KVM_BOOK3S_64 && !KVM_MPIC
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
default y
help
Include support for the XICS (eXternal Interrupt Controller

2
arch/powerpc/kvm/book3s_hv.c
View File

@ -6240,7 +6240,7 @@ static int kvmhv_svm_off(struct kvm *kvm)
}
srcu_idx = srcu_read_lock(&kvm->srcu);
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
struct kvm_memory_slot *memslot;
struct kvm_memslots *slots = __kvm_memslots(kvm, i);
int bkt;

10
arch/powerpc/kvm/powerpc.c
View File

@ -528,7 +528,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_ONE_REG:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_IMMEDIATE_EXIT:
case KVM_CAP_SET_GUEST_DEBUG:
r = 1;
@ -578,7 +577,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
#endif
#ifdef CONFIG_HAVE_KVM_IRQFD
#ifdef CONFIG_HAVE_KVM_IRQCHIP
case KVM_CAP_IRQFD_RESAMPLE:
r = !xive_enabled();
break;
@ -632,13 +631,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
#endif
case KVM_CAP_SYNC_MMU:
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
r = hv_enabled;
#elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
BUILD_BUG_ON(!IS_ENABLED(CONFIG_KVM_GENERIC_MMU_NOTIFIER));
r = 1;
#else
r = 0;
#endif
break;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
case KVM_CAP_PPC_HTAB_FD:

19
arch/riscv/Kconfig
View File

@ -723,6 +723,25 @@ config COMPAT
If you want to execute 32-bit userspace applications, say Y.
config PARAVIRT
bool "Enable paravirtualization code"
depends on RISCV_SBI
help
This changes the kernel so it can modify itself when it is run
under a hypervisor, potentially improving performance significantly
over full virtualization.
config PARAVIRT_TIME_ACCOUNTING
bool "Paravirtual steal time accounting"
depends on PARAVIRT
help
Select this option to enable fine granularity task steal time
accounting. Time spent executing other tasks in parallel with
the current vCPU is discounted from the vCPU power. To account for
that, there can be a small performance impact.
If in doubt, say N here.
config RELOCATABLE
bool "Build a relocatable kernel"
depends on MMU && 64BIT && !XIP_KERNEL

12
arch/riscv/include/asm/kvm_host.h
View File

@ -41,6 +41,7 @@
KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HFENCE \
KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6)
enum kvm_riscv_hfence_type {
KVM_RISCV_HFENCE_UNKNOWN = 0,
@ -262,13 +263,17 @@ struct kvm_vcpu_arch {
/* 'static' configurations which are set only once */
struct kvm_vcpu_config cfg;
/* SBI steal-time accounting */
struct {
gpa_t shmem;
u64 last_steal;
} sta;
};
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
#define KVM_ARCH_WANT_MMU_NOTIFIER
#define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12
void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
@ -372,4 +377,7 @@ bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu);
void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
#endif /* __RISCV_KVM_HOST_H__ */

20
arch/riscv/include/asm/kvm_vcpu_sbi.h
View File

@ -15,9 +15,10 @@
#define KVM_SBI_VERSION_MINOR 0
enum kvm_riscv_sbi_ext_status {
KVM_RISCV_SBI_EXT_UNINITIALIZED,
KVM_RISCV_SBI_EXT_AVAILABLE,
KVM_RISCV_SBI_EXT_UNAVAILABLE,
KVM_RISCV_SBI_EXT_STATUS_UNINITIALIZED,
KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE,
KVM_RISCV_SBI_EXT_STATUS_ENABLED,
KVM_RISCV_SBI_EXT_STATUS_DISABLED,
};
struct kvm_vcpu_sbi_context {
@ -36,7 +37,7 @@ struct kvm_vcpu_sbi_extension {
unsigned long extid_start;
unsigned long extid_end;
bool default_unavail;
bool default_disabled;
/**
* SBI extension handler. It can be defined for a given extension or group of
@ -59,11 +60,21 @@ int kvm_riscv_vcpu_set_reg_sbi_ext(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_set_reg_sbi(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
int kvm_riscv_vcpu_get_reg_sbi(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg);
const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
struct kvm_vcpu *vcpu, unsigned long extid);
bool riscv_vcpu_supports_sbi_ext(struct kvm_vcpu *vcpu, int idx);
int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu);
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num,
unsigned long *reg_val);
int kvm_riscv_vcpu_set_reg_sbi_sta(struct kvm_vcpu *vcpu, unsigned long reg_num,
unsigned long reg_val);
#ifdef CONFIG_RISCV_SBI_V01
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01;
#endif
@ -74,6 +85,7 @@ extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;

28
arch/riscv/include/asm/paravirt.h Normal file
View File

@ -0,0 +1,28 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_RISCV_PARAVIRT_H
#define _ASM_RISCV_PARAVIRT_H
#ifdef CONFIG_PARAVIRT
#include <linux/static_call_types.h>
struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;
u64 dummy_steal_clock(int cpu);
DECLARE_STATIC_CALL(pv_steal_clock, dummy_steal_clock);
static inline u64 paravirt_steal_clock(int cpu)
{
return static_call(pv_steal_clock)(cpu);
}
int __init pv_time_init(void);
#else
#define pv_time_init() do {} while (0)
#endif /* CONFIG_PARAVIRT */
#endif /* _ASM_RISCV_PARAVIRT_H */

1
arch/riscv/include/asm/paravirt_api_clock.h Normal file
View File

@ -0,0 +1 @@
#include <asm/paravirt.h>

17
arch/riscv/include/asm/sbi.h
View File

@ -31,6 +31,7 @@ enum sbi_ext_id {
SBI_EXT_SRST = 0x53525354,
SBI_EXT_PMU = 0x504D55,
SBI_EXT_DBCN = 0x4442434E,
SBI_EXT_STA = 0x535441,
/* Experimentals extensions must lie within this range */
SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@ -243,6 +244,22 @@ enum sbi_ext_dbcn_fid {
SBI_EXT_DBCN_CONSOLE_WRITE_BYTE = 2,
};
/* SBI STA (steal-time accounting) extension */
enum sbi_ext_sta_fid {
SBI_EXT_STA_STEAL_TIME_SET_SHMEM = 0,
};
struct sbi_sta_struct {
__le32 sequence;
__le32 flags;
__le64 steal;
u8 preempted;
u8 pad[47];
} __packed;
#define SBI_STA_SHMEM_DISABLE -1
/* SBI spec version fields */
#define SBI_SPEC_VERSION_DEFAULT 0x1
#define SBI_SPEC_VERSION_MAJOR_SHIFT 24
#define SBI_SPEC_VERSION_MAJOR_MASK 0x7f

13
arch/riscv/include/uapi/asm/kvm.h
View File

@ -157,9 +157,16 @@ enum KVM_RISCV_SBI_EXT_ID {
KVM_RISCV_SBI_EXT_EXPERIMENTAL,
KVM_RISCV_SBI_EXT_VENDOR,
KVM_RISCV_SBI_EXT_DBCN,
KVM_RISCV_SBI_EXT_STA,
KVM_RISCV_SBI_EXT_MAX,
};
/* SBI STA extension registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_sbi_sta {
unsigned long shmem_lo;
unsigned long shmem_hi;
};
/* Possible states for kvm_riscv_timer */
#define KVM_RISCV_TIMER_STATE_OFF 0
#define KVM_RISCV_TIMER_STATE_ON 1
@ -241,6 +248,12 @@ enum KVM_RISCV_SBI_EXT_ID {
#define KVM_REG_RISCV_VECTOR_REG(n) \
((n) + sizeof(struct __riscv_v_ext_state) / sizeof(unsigned long))
/* Registers for specific SBI extensions are mapped as type 10 */
#define KVM_REG_RISCV_SBI_STATE (0x0a << KVM_REG_RISCV_TYPE_SHIFT)
#define KVM_REG_RISCV_SBI_STA (0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_SBI_STA_REG(name) \
(offsetof(struct kvm_riscv_sbi_sta, name) / sizeof(unsigned long))
/* Device Control API: RISC-V AIA */
#define KVM_DEV_RISCV_APLIC_ALIGN 0x1000
#define KVM_DEV_RISCV_APLIC_SIZE 0x4000

1
arch/riscv/kernel/Makefile
View File

@ -86,6 +86,7 @@ obj-$(CONFIG_SMP) += sbi-ipi.o
obj-$(CONFIG_SMP) += cpu_ops_sbi.o
endif
obj-$(CONFIG_HOTPLUG_CPU) += cpu-hotplug.o
obj-$(CONFIG_PARAVIRT) += paravirt.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_KEXEC_CORE) += kexec_relocate.o crash_save_regs.o machine_kexec.o
obj-$(CONFIG_KEXEC_FILE) += elf_kexec.o machine_kexec_file.o

135
arch/riscv/kernel/paravirt.c Normal file
View File

@ -0,0 +1,135 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*/
#define pr_fmt(fmt) "riscv-pv: " fmt
#include <linux/cpuhotplug.h>
#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/jump_label.h>
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/percpu-defs.h>
#include <linux/printk.h>
#include <linux/static_call.h>
#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/page.h>
#include <asm/paravirt.h>
#include <asm/sbi.h>
struct static_key paravirt_steal_enabled;
struct static_key paravirt_steal_rq_enabled;
static u64 native_steal_clock(int cpu)
{
return 0;
}
DEFINE_STATIC_CALL(pv_steal_clock, native_steal_clock);
static bool steal_acc = true;
static int __init parse_no_stealacc(char *arg)
{
steal_acc = false;
return 0;
}
early_param("no-steal-acc", parse_no_stealacc);
DEFINE_PER_CPU(struct sbi_sta_struct, steal_time) __aligned(64);
static bool __init has_pv_steal_clock(void)
{
if (sbi_spec_version >= sbi_mk_version(2, 0) &&
sbi_probe_extension(SBI_EXT_STA) > 0) {
pr_info("SBI STA extension detected\n");
return true;
}
return false;
}
static int sbi_sta_steal_time_set_shmem(unsigned long lo, unsigned long hi,
unsigned long flags)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_STA, SBI_EXT_STA_STEAL_TIME_SET_SHMEM,
lo, hi, flags, 0, 0, 0);
if (ret.error) {
if (lo == SBI_STA_SHMEM_DISABLE && hi == SBI_STA_SHMEM_DISABLE)
pr_warn("Failed to disable steal-time shmem");
else
pr_warn("Failed to set steal-time shmem");
return sbi_err_map_linux_errno(ret.error);
}
return 0;
}
static int pv_time_cpu_online(unsigned int cpu)
{
struct sbi_sta_struct *st = this_cpu_ptr(&steal_time);
phys_addr_t pa = __pa(st);
unsigned long lo = (unsigned long)pa;
unsigned long hi = IS_ENABLED(CONFIG_32BIT) ? upper_32_bits((u64)pa) : 0;
return sbi_sta_steal_time_set_shmem(lo, hi, 0);
}
static int pv_time_cpu_down_prepare(unsigned int cpu)
{
return sbi_sta_steal_time_set_shmem(SBI_STA_SHMEM_DISABLE,
SBI_STA_SHMEM_DISABLE, 0);
}
static u64 pv_time_steal_clock(int cpu)
{
struct sbi_sta_struct *st = per_cpu_ptr(&steal_time, cpu);
u32 sequence;
u64 steal;
/*
* Check the sequence field before and after reading the steal
* field. Repeat the read if it is different or odd.
*/
do {
sequence = READ_ONCE(st->sequence);
virt_rmb();
steal = READ_ONCE(st->steal);
virt_rmb();
} while ((le32_to_cpu(sequence) & 1) ||
sequence != READ_ONCE(st->sequence));
return le64_to_cpu(steal);
}
int __init pv_time_init(void)
{
int ret;
if (!has_pv_steal_clock())
return 0;
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"riscv/pv_time:online",
pv_time_cpu_online,
pv_time_cpu_down_prepare);
if (ret < 0)
return ret;
static_call_update(pv_steal_clock, pv_time_steal_clock);
static_key_slow_inc(&paravirt_steal_enabled);
if (steal_acc)
static_key_slow_inc(&paravirt_steal_rq_enabled);
pr_info("Computing paravirt steal-time\n");
return 0;
}

3
arch/riscv/kernel/time.c
View File

@ -12,6 +12,7 @@
#include <asm/sbi.h>
#include <asm/processor.h>
#include <asm/timex.h>
#include <asm/paravirt.h>
unsigned long riscv_timebase __ro_after_init;
EXPORT_SYMBOL_GPL(riscv_timebase);
@ -45,4 +46,6 @@ void __init time_init(void)
timer_probe();
tick_setup_hrtimer_broadcast();
pv_time_init();
}

7
arch/riscv/kvm/Kconfig
View File

@ -20,18 +20,17 @@ if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support (EXPERIMENTAL)"
depends on RISCV_SBI && MMU
select HAVE_KVM_EVENTFD
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_MSI
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_MMIO
select KVM_XFER_TO_GUEST_WORK
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select KVM_GENERIC_MMU_NOTIFIER
select SCHED_INFO
help
Support hosting virtualized guest machines.

1
arch/riscv/kvm/Makefile
View File

@ -26,6 +26,7 @@ kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
kvm-y += vcpu_sbi_base.o
kvm-y += vcpu_sbi_replace.o
kvm-y += vcpu_sbi_hsm.o
kvm-y += vcpu_sbi_sta.o
kvm-y += vcpu_timer.o
kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o
kvm-y += aia.o

10
arch/riscv/kvm/vcpu.c
View File

@ -83,6 +83,8 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
vcpu->arch.hfence_tail = 0;
memset(vcpu->arch.hfence_queue, 0, sizeof(vcpu->arch.hfence_queue));
kvm_riscv_vcpu_sbi_sta_reset(vcpu);
/* Reset the guest CSRs for hotplug usecase */
if (loaded)
kvm_arch_vcpu_load(vcpu, smp_processor_id());
@ -541,6 +543,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
kvm_riscv_vcpu_aia_load(vcpu, cpu);
kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
vcpu->cpu = cpu;
}
@ -614,6 +618,9 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_HFENCE, vcpu))
kvm_riscv_hfence_process(vcpu);
if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
kvm_riscv_vcpu_record_steal_time(vcpu);
}
}
@ -757,8 +764,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
/* Update HVIP CSR for current CPU */
kvm_riscv_update_hvip(vcpu);
if (ret <= 0 ||
kvm_riscv_gstage_vmid_ver_changed(&vcpu->kvm->arch.vmid) ||
if (kvm_riscv_gstage_vmid_ver_changed(&vcpu->kvm->arch.vmid) ||
kvm_request_pending(vcpu) ||
xfer_to_guest_mode_work_pending()) {
vcpu->mode = OUTSIDE_GUEST_MODE;

147
arch/riscv/kvm/vcpu_onereg.c
View File

@ -485,7 +485,7 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN))
rc = kvm_riscv_vcpu_smstateen_set_csr(vcpu, reg_num,
reg_val);
break;
break;
default:
rc = -ENOENT;
break;
@ -931,50 +931,49 @@ static inline unsigned long num_isa_ext_regs(const struct kvm_vcpu *vcpu)
return copy_isa_ext_reg_indices(vcpu, NULL);;
}
static inline unsigned long num_sbi_ext_regs(void)
static int copy_sbi_ext_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
/*
* number of KVM_REG_RISCV_SBI_SINGLE +
* 2 x (number of KVM_REG_RISCV_SBI_MULTI)
*/
return KVM_RISCV_SBI_EXT_MAX + 2*(KVM_REG_RISCV_SBI_MULTI_REG_LAST+1);
}
unsigned int n = 0;
static int copy_sbi_ext_reg_indices(u64 __user *uindices)
{
int n;
/* copy KVM_REG_RISCV_SBI_SINGLE */
n = KVM_RISCV_SBI_EXT_MAX;
for (int i = 0; i < n; i++) {
for (int i = 0; i < KVM_RISCV_SBI_EXT_MAX; i++) {
u64 size = IS_ENABLED(CONFIG_32BIT) ?
KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
u64 reg = KVM_REG_RISCV | size | KVM_REG_RISCV_SBI_EXT |
KVM_REG_RISCV_SBI_SINGLE | i;
if (!riscv_vcpu_supports_sbi_ext(vcpu, i))
continue;
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
n++;
}
/* copy KVM_REG_RISCV_SBI_MULTI */
n = KVM_REG_RISCV_SBI_MULTI_REG_LAST + 1;
return n;
}
static unsigned long num_sbi_ext_regs(struct kvm_vcpu *vcpu)
{
return copy_sbi_ext_reg_indices(vcpu, NULL);
}
static int copy_sbi_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
{
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
int total = 0;
if (scontext->ext_status[KVM_RISCV_SBI_EXT_STA] == KVM_RISCV_SBI_EXT_STATUS_ENABLED) {
u64 size = IS_ENABLED(CONFIG_32BIT) ? KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
int n = sizeof(struct kvm_riscv_sbi_sta) / sizeof(unsigned long);
for (int i = 0; i < n; i++) {
u64 size = IS_ENABLED(CONFIG_32BIT) ?
KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
u64 reg = KVM_REG_RISCV | size | KVM_REG_RISCV_SBI_EXT |
KVM_REG_RISCV_SBI_MULTI_EN | i;
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
reg = KVM_REG_RISCV | size | KVM_REG_RISCV_SBI_EXT |
KVM_REG_RISCV_SBI_MULTI_DIS | i;
u64 reg = KVM_REG_RISCV | size |
KVM_REG_RISCV_SBI_STATE |
KVM_REG_RISCV_SBI_STA | i;
if (uindices) {
if (put_user(reg, uindices))
@ -983,7 +982,64 @@ static int copy_sbi_ext_reg_indices(u64 __user *uindices)
}
}
return num_sbi_ext_regs();
total += n;
}
return total;
}
static inline unsigned long num_sbi_regs(struct kvm_vcpu *vcpu)
{
return copy_sbi_reg_indices(vcpu, NULL);
}
static inline unsigned long num_vector_regs(const struct kvm_vcpu *vcpu)
{
if (!riscv_isa_extension_available(vcpu->arch.isa, v))
return 0;
/* vstart, vl, vtype, vcsr, vlenb and 32 vector regs */
return 37;
}
static int copy_vector_reg_indices(const struct kvm_vcpu *vcpu,
u64 __user *uindices)
{
const struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
int n = num_vector_regs(vcpu);
u64 reg, size;
int i;
if (n == 0)
return 0;
/* copy vstart, vl, vtype, vcsr and vlenb */
size = IS_ENABLED(CONFIG_32BIT) ? KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
for (i = 0; i < 5; i++) {
reg = KVM_REG_RISCV | size | KVM_REG_RISCV_VECTOR | i;
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
}
/* vector_regs have a variable 'vlenb' size */
size = __builtin_ctzl(cntx->vector.vlenb);
size <<= KVM_REG_SIZE_SHIFT;
for (i = 0; i < 32; i++) {
reg = KVM_REG_RISCV | KVM_REG_RISCV_VECTOR | size |
KVM_REG_RISCV_VECTOR_REG(i);
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
}
return n;
}
/*
@ -1001,8 +1057,10 @@ unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu)
res += num_timer_regs();
res += num_fp_f_regs(vcpu);
res += num_fp_d_regs(vcpu);
res += num_vector_regs(vcpu);
res += num_isa_ext_regs(vcpu);
res += num_sbi_ext_regs();
res += num_sbi_ext_regs(vcpu);
res += num_sbi_regs(vcpu);
return res;
}
@ -1045,14 +1103,25 @@ int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu,
return ret;
uindices += ret;
ret = copy_vector_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;
uindices += ret;
ret = copy_isa_ext_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;
uindices += ret;
ret = copy_sbi_ext_reg_indices(uindices);
ret = copy_sbi_ext_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;
uindices += ret;
ret = copy_sbi_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;
uindices += ret;
return 0;
}
@ -1075,12 +1144,14 @@ int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_FP_D:
return kvm_riscv_vcpu_set_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
case KVM_REG_RISCV_VECTOR:
return kvm_riscv_vcpu_set_reg_vector(vcpu, reg);
case KVM_REG_RISCV_ISA_EXT:
return kvm_riscv_vcpu_set_reg_isa_ext(vcpu, reg);
case KVM_REG_RISCV_SBI_EXT:
return kvm_riscv_vcpu_set_reg_sbi_ext(vcpu, reg);
case KVM_REG_RISCV_VECTOR:
return kvm_riscv_vcpu_set_reg_vector(vcpu, reg);
case KVM_REG_RISCV_SBI_STATE:
return kvm_riscv_vcpu_set_reg_sbi(vcpu, reg);
default:
break;
}
@ -1106,12 +1177,14 @@ int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_FP_D:
return kvm_riscv_vcpu_get_reg_fp(vcpu, reg,
KVM_REG_RISCV_FP_D);
case KVM_REG_RISCV_VECTOR:
return kvm_riscv_vcpu_get_reg_vector(vcpu, reg);
case KVM_REG_RISCV_ISA_EXT:
return kvm_riscv_vcpu_get_reg_isa_ext(vcpu, reg);
case KVM_REG_RISCV_SBI_EXT:
return kvm_riscv_vcpu_get_reg_sbi_ext(vcpu, reg);
case KVM_REG_RISCV_VECTOR:
return kvm_riscv_vcpu_get_reg_vector(vcpu, reg);
case KVM_REG_RISCV_SBI_STATE:
return kvm_riscv_vcpu_get_reg_sbi(vcpu, reg);
default:
break;
}

142
arch/riscv/kvm/vcpu_sbi.c
View File

@ -70,6 +70,10 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = {
.ext_idx = KVM_RISCV_SBI_EXT_DBCN,
.ext_ptr = &vcpu_sbi_ext_dbcn,
},
{
.ext_idx = KVM_RISCV_SBI_EXT_STA,
.ext_ptr = &vcpu_sbi_ext_sta,
},
{
.ext_idx = KVM_RISCV_SBI_EXT_EXPERIMENTAL,
.ext_ptr = &vcpu_sbi_ext_experimental,
@ -80,6 +84,34 @@ static const struct kvm_riscv_sbi_extension_entry sbi_ext[] = {
},
};
static const struct kvm_riscv_sbi_extension_entry *
riscv_vcpu_get_sbi_ext(struct kvm_vcpu *vcpu, unsigned long idx)
{
const struct kvm_riscv_sbi_extension_entry *sext = NULL;
if (idx >= KVM_RISCV_SBI_EXT_MAX)
return NULL;
for (int i = 0; i < ARRAY_SIZE(sbi_ext); i++) {
if (sbi_ext[i].ext_idx == idx) {
sext = &sbi_ext[i];
break;
}
}
return sext;
}
bool riscv_vcpu_supports_sbi_ext(struct kvm_vcpu *vcpu, int idx)
{
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
const struct kvm_riscv_sbi_extension_entry *sext;
sext = riscv_vcpu_get_sbi_ext(vcpu, idx);
return sext && scontext->ext_status[sext->ext_idx] != KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE;
}
void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
@ -140,28 +172,19 @@ static int riscv_vcpu_set_sbi_ext_single(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long reg_val)
{
unsigned long i;
const struct kvm_riscv_sbi_extension_entry *sext = NULL;
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
if (reg_num >= KVM_RISCV_SBI_EXT_MAX)
return -ENOENT;
const struct kvm_riscv_sbi_extension_entry *sext;
if (reg_val != 1 && reg_val != 0)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) {
if (sbi_ext[i].ext_idx == reg_num) {
sext = &sbi_ext[i];
break;
}
}
if (!sext)
sext = riscv_vcpu_get_sbi_ext(vcpu, reg_num);
if (!sext || scontext->ext_status[sext->ext_idx] == KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE)
return -ENOENT;
scontext->ext_status[sext->ext_idx] = (reg_val) ?
KVM_RISCV_SBI_EXT_AVAILABLE :
KVM_RISCV_SBI_EXT_UNAVAILABLE;
KVM_RISCV_SBI_EXT_STATUS_ENABLED :
KVM_RISCV_SBI_EXT_STATUS_DISABLED;
return 0;
}
@ -170,24 +193,16 @@ static int riscv_vcpu_get_sbi_ext_single(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long *reg_val)
{
unsigned long i;
const struct kvm_riscv_sbi_extension_entry *sext = NULL;
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
const struct kvm_riscv_sbi_extension_entry *sext;
if (reg_num >= KVM_RISCV_SBI_EXT_MAX)
return -ENOENT;
for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) {
if (sbi_ext[i].ext_idx == reg_num) {
sext = &sbi_ext[i];
break;
}
}
if (!sext)
sext = riscv_vcpu_get_sbi_ext(vcpu, reg_num);
if (!sext || scontext->ext_status[sext->ext_idx] == KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE)
return -ENOENT;
*reg_val = scontext->ext_status[sext->ext_idx] ==
KVM_RISCV_SBI_EXT_AVAILABLE;
KVM_RISCV_SBI_EXT_STATUS_ENABLED;
return 0;
}
@ -310,6 +325,69 @@ int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu,
return 0;
}
int kvm_riscv_vcpu_set_reg_sbi(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_SBI_STATE);
unsigned long reg_subtype, reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
switch (reg_subtype) {
case KVM_REG_RISCV_SBI_STA:
return kvm_riscv_vcpu_set_reg_sbi_sta(vcpu, reg_num, reg_val);
default:
return -EINVAL;
}
return 0;
}
int kvm_riscv_vcpu_get_reg_sbi(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_SBI_STATE);
unsigned long reg_subtype, reg_val;
int ret;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
switch (reg_subtype) {
case KVM_REG_RISCV_SBI_STA:
ret = kvm_riscv_vcpu_get_reg_sbi_sta(vcpu, reg_num, &reg_val);
break;
default:
return -EINVAL;
}
if (ret)
return ret;
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
struct kvm_vcpu *vcpu, unsigned long extid)
{
@ -325,7 +403,7 @@ const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
if (ext->extid_start <= extid && ext->extid_end >= extid) {
if (entry->ext_idx >= KVM_RISCV_SBI_EXT_MAX ||
scontext->ext_status[entry->ext_idx] ==
KVM_RISCV_SBI_EXT_AVAILABLE)
KVM_RISCV_SBI_EXT_STATUS_ENABLED)
return ext;
return NULL;
@ -413,12 +491,12 @@ void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu)
if (ext->probe && !ext->probe(vcpu)) {
scontext->ext_status[entry->ext_idx] =
KVM_RISCV_SBI_EXT_UNAVAILABLE;
KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE;
continue;
}
scontext->ext_status[entry->ext_idx] = ext->default_unavail ?
KVM_RISCV_SBI_EXT_UNAVAILABLE :
KVM_RISCV_SBI_EXT_AVAILABLE;
scontext->ext_status[entry->ext_idx] = ext->default_disabled ?
KVM_RISCV_SBI_EXT_STATUS_DISABLED :
KVM_RISCV_SBI_EXT_STATUS_ENABLED;
}
}

2
arch/riscv/kvm/vcpu_sbi_replace.c
View File

@ -204,6 +204,6 @@ static int kvm_sbi_ext_dbcn_handler(struct kvm_vcpu *vcpu,
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_dbcn = {
.extid_start = SBI_EXT_DBCN,
.extid_end = SBI_EXT_DBCN,
.default_unavail = true,
.default_disabled = true,
.handler = kvm_sbi_ext_dbcn_handler,
};

208
arch/riscv/kvm/vcpu_sbi_sta.c Normal file
View File

@ -0,0 +1,208 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*/
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/kvm_host.h>
#include <linux/mm.h>
#include <linux/sizes.h>
#include <asm/bug.h>
#include <asm/current.h>
#include <asm/kvm_vcpu_sbi.h>
#include <asm/page.h>
#include <asm/sbi.h>
#include <asm/uaccess.h>
void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu)
{
vcpu->arch.sta.shmem = INVALID_GPA;
vcpu->arch.sta.last_steal = 0;
}
void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu)
{
gpa_t shmem = vcpu->arch.sta.shmem;
u64 last_steal = vcpu->arch.sta.last_steal;
u32 *sequence_ptr, sequence;
u64 *steal_ptr, steal;
unsigned long hva;
gfn_t gfn;
if (shmem == INVALID_GPA)
return;
/*
* shmem is 64-byte aligned (see the enforcement in
* kvm_sbi_sta_steal_time_set_shmem()) and the size of sbi_sta_struct
* is 64 bytes, so we know all its offsets are in the same page.
*/
gfn = shmem >> PAGE_SHIFT;
hva = kvm_vcpu_gfn_to_hva(vcpu, gfn);
if (WARN_ON(kvm_is_error_hva(hva))) {
vcpu->arch.sta.shmem = INVALID_GPA;
return;
}
sequence_ptr = (u32 *)(hva + offset_in_page(shmem) +
offsetof(struct sbi_sta_struct, sequence));
steal_ptr = (u64 *)(hva + offset_in_page(shmem) +
offsetof(struct sbi_sta_struct, steal));
if (WARN_ON(get_user(sequence, sequence_ptr)))
return;
sequence = le32_to_cpu(sequence);
sequence += 1;
if (WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr)))
return;
if (!WARN_ON(get_user(steal, steal_ptr))) {
steal = le64_to_cpu(steal);
vcpu->arch.sta.last_steal = READ_ONCE(current->sched_info.run_delay);
steal += vcpu->arch.sta.last_steal - last_steal;
WARN_ON(put_user(cpu_to_le64(steal), steal_ptr));
}
sequence += 1;
WARN_ON(put_user(cpu_to_le32(sequence), sequence_ptr));
kvm_vcpu_mark_page_dirty(vcpu, gfn);
}
static int kvm_sbi_sta_steal_time_set_shmem(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
unsigned long shmem_phys_lo = cp->a0;
unsigned long shmem_phys_hi = cp->a1;
u32 flags = cp->a2;
struct sbi_sta_struct zero_sta = {0};
unsigned long hva;
bool writable;
gpa_t shmem;
int ret;
if (flags != 0)
return SBI_ERR_INVALID_PARAM;
if (shmem_phys_lo == SBI_STA_SHMEM_DISABLE &&
shmem_phys_hi == SBI_STA_SHMEM_DISABLE) {
vcpu->arch.sta.shmem = INVALID_GPA;
return 0;
}
if (shmem_phys_lo & (SZ_64 - 1))
return SBI_ERR_INVALID_PARAM;
shmem = shmem_phys_lo;
if (shmem_phys_hi != 0) {
if (IS_ENABLED(CONFIG_32BIT))
shmem |= ((gpa_t)shmem_phys_hi << 32);
else
return SBI_ERR_INVALID_ADDRESS;
}
hva = kvm_vcpu_gfn_to_hva_prot(vcpu, shmem >> PAGE_SHIFT, &writable);
if (kvm_is_error_hva(hva) || !writable)
return SBI_ERR_INVALID_ADDRESS;
ret = kvm_vcpu_write_guest(vcpu, shmem, &zero_sta, sizeof(zero_sta));
if (ret)
return SBI_ERR_FAILURE;
vcpu->arch.sta.shmem = shmem;
vcpu->arch.sta.last_steal = current->sched_info.run_delay;
return 0;
}
static int kvm_sbi_ext_sta_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_vcpu_sbi_return *retdata)
{
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
unsigned long funcid = cp->a6;
int ret;
switch (funcid) {
case SBI_EXT_STA_STEAL_TIME_SET_SHMEM:
ret = kvm_sbi_sta_steal_time_set_shmem(vcpu);
break;
default:
ret = SBI_ERR_NOT_SUPPORTED;
break;
}
retdata->err_val = ret;
return 0;
}
static unsigned long kvm_sbi_ext_sta_probe(struct kvm_vcpu *vcpu)
{
return !!sched_info_on();
}
const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_sta = {
.extid_start = SBI_EXT_STA,
.extid_end = SBI_EXT_STA,
.handler = kvm_sbi_ext_sta_handler,
.probe = kvm_sbi_ext_sta_probe,
};
int kvm_riscv_vcpu_get_reg_sbi_sta(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long *reg_val)
{
switch (reg_num) {
case KVM_REG_RISCV_SBI_STA_REG(shmem_lo):
*reg_val = (unsigned long)vcpu->arch.sta.shmem;
break;
case KVM_REG_RISCV_SBI_STA_REG(shmem_hi):
if (IS_ENABLED(CONFIG_32BIT))
*reg_val = upper_32_bits(vcpu->arch.sta.shmem);
else
*reg_val = 0;
break;
default:
return -EINVAL;
}
return 0;
}
int kvm_riscv_vcpu_set_reg_sbi_sta(struct kvm_vcpu *vcpu,
unsigned long reg_num,
unsigned long reg_val)
{
switch (reg_num) {
case KVM_REG_RISCV_SBI_STA_REG(shmem_lo):
if (IS_ENABLED(CONFIG_32BIT)) {
gpa_t hi = upper_32_bits(vcpu->arch.sta.shmem);
vcpu->arch.sta.shmem = reg_val;
vcpu->arch.sta.shmem |= hi << 32;
} else {
vcpu->arch.sta.shmem = reg_val;
}
break;
case KVM_REG_RISCV_SBI_STA_REG(shmem_hi):
if (IS_ENABLED(CONFIG_32BIT)) {
gpa_t lo = lower_32_bits(vcpu->arch.sta.shmem);
vcpu->arch.sta.shmem = ((gpa_t)reg_val << 32);
vcpu->arch.sta.shmem |= lo;
} else if (reg_val != 0) {
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return 0;
}

32
arch/riscv/kvm/vcpu_switch.S
View File

@ -15,7 +15,7 @@
.altmacro
.option norelax
ENTRY(__kvm_riscv_switch_to)
SYM_FUNC_START(__kvm_riscv_switch_to)
/* Save Host GPRs (except A0 and T0-T6) */
REG_S ra, (KVM_ARCH_HOST_RA)(a0)
REG_S sp, (KVM_ARCH_HOST_SP)(a0)
@ -45,7 +45,7 @@ ENTRY(__kvm_riscv_switch_to)
REG_L t0, (KVM_ARCH_GUEST_SSTATUS)(a0)
REG_L t1, (KVM_ARCH_GUEST_HSTATUS)(a0)
REG_L t2, (KVM_ARCH_GUEST_SCOUNTEREN)(a0)
la t4, __kvm_switch_return
la t4, .Lkvm_switch_return
REG_L t5, (KVM_ARCH_GUEST_SEPC)(a0)
/* Save Host and Restore Guest SSTATUS */
@ -113,7 +113,7 @@ ENTRY(__kvm_riscv_switch_to)
/* Back to Host */
.align 2
__kvm_switch_return:
.Lkvm_switch_return:
/* Swap Guest A0 with SSCRATCH */
csrrw a0, CSR_SSCRATCH, a0
@ -208,9 +208,9 @@ __kvm_switch_return:
/* Return to C code */
ret
ENDPROC(__kvm_riscv_switch_to)
SYM_FUNC_END(__kvm_riscv_switch_to)
ENTRY(__kvm_riscv_unpriv_trap)
SYM_CODE_START(__kvm_riscv_unpriv_trap)
/*
* We assume that faulting unpriv load/store instruction is
* 4-byte long and blindly increment SEPC by 4.
@ -231,12 +231,10 @@ ENTRY(__kvm_riscv_unpriv_trap)
csrr a1, CSR_HTINST
REG_S a1, (KVM_ARCH_TRAP_HTINST)(a0)
sret
ENDPROC(__kvm_riscv_unpriv_trap)
SYM_CODE_END(__kvm_riscv_unpriv_trap)
#ifdef CONFIG_FPU
.align 3
.global __kvm_riscv_fp_f_save
__kvm_riscv_fp_f_save:
SYM_FUNC_START(__kvm_riscv_fp_f_save)
csrr t2, CSR_SSTATUS
li t1, SR_FS
csrs CSR_SSTATUS, t1
@ -276,10 +274,9 @@ __kvm_riscv_fp_f_save:
sw t0, KVM_ARCH_FP_F_FCSR(a0)
csrw CSR_SSTATUS, t2
ret
SYM_FUNC_END(__kvm_riscv_fp_f_save)
.align 3
.global __kvm_riscv_fp_d_save
__kvm_riscv_fp_d_save:
SYM_FUNC_START(__kvm_riscv_fp_d_save)
csrr t2, CSR_SSTATUS
li t1, SR_FS
csrs CSR_SSTATUS, t1
@ -319,10 +316,9 @@ __kvm_riscv_fp_d_save:
sw t0, KVM_ARCH_FP_D_FCSR(a0)
csrw CSR_SSTATUS, t2
ret
SYM_FUNC_END(__kvm_riscv_fp_d_save)
.align 3
.global __kvm_riscv_fp_f_restore
__kvm_riscv_fp_f_restore:
SYM_FUNC_START(__kvm_riscv_fp_f_restore)
csrr t2, CSR_SSTATUS
li t1, SR_FS
lw t0, KVM_ARCH_FP_F_FCSR(a0)
@ -362,10 +358,9 @@ __kvm_riscv_fp_f_restore:
fscsr t0
csrw CSR_SSTATUS, t2
ret
SYM_FUNC_END(__kvm_riscv_fp_f_restore)
.align 3
.global __kvm_riscv_fp_d_restore
__kvm_riscv_fp_d_restore:
SYM_FUNC_START(__kvm_riscv_fp_d_restore)
csrr t2, CSR_SSTATUS
li t1, SR_FS
lw t0, KVM_ARCH_FP_D_FCSR(a0)
@ -405,4 +400,5 @@ __kvm_riscv_fp_d_restore:
fscsr t0
csrw CSR_SSTATUS, t2
ret
SYM_FUNC_END(__kvm_riscv_fp_d_restore)
#endif

16
arch/riscv/kvm/vcpu_vector.c
View File

@ -76,6 +76,7 @@ int kvm_riscv_vcpu_alloc_vector_context(struct kvm_vcpu *vcpu,
cntx->vector.datap = kmalloc(riscv_v_vsize, GFP_KERNEL);
if (!cntx->vector.datap)
return -ENOMEM;
cntx->vector.vlenb = riscv_v_vsize / 32;
vcpu->arch.host_context.vector.datap = kzalloc(riscv_v_vsize, GFP_KERNEL);
if (!vcpu->arch.host_context.vector.datap)
@ -115,6 +116,9 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu,
case KVM_REG_RISCV_VECTOR_CSR_REG(vcsr):
*reg_addr = &cntx->vector.vcsr;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(vlenb):
*reg_addr = &cntx->vector.vlenb;
break;
case KVM_REG_RISCV_VECTOR_CSR_REG(datap):
default:
return -ENOENT;
@ -173,6 +177,18 @@ int kvm_riscv_vcpu_set_reg_vector(struct kvm_vcpu *vcpu,
if (!riscv_isa_extension_available(isa, v))
return -ENOENT;
if (reg_num == KVM_REG_RISCV_VECTOR_CSR_REG(vlenb)) {
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long reg_val;
if (copy_from_user(&reg_val, uaddr, reg_size))
return -EFAULT;
if (reg_val != cntx->vector.vlenb)
return -EINVAL;
return 0;
}
rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, &reg_addr);
if (rc)
return rc;

1
arch/riscv/kvm/vm.c
View File

@ -179,7 +179,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = kvm_riscv_aia_available();
break;
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:

6
arch/s390/include/asm/facility.h
View File

@ -111,4 +111,10 @@ static inline void stfle(u64 *stfle_fac_list, int size)
preempt_enable();
}
/**
* stfle_size - Actual size of the facility list as specified by stfle
* (number of double words)
*/
unsigned int stfle_size(void);
#endif /* __ASM_FACILITY_H */

2
arch/s390/include/asm/kvm_host.h
View File

@ -818,7 +818,7 @@ struct s390_io_adapter {
struct kvm_s390_cpu_model {
/* facility mask supported by kvm & hosting machine */
__u64 fac_mask[S390_ARCH_FAC_LIST_SIZE_U64];
__u64 fac_mask[S390_ARCH_FAC_MASK_SIZE_U64];
struct kvm_s390_vm_cpu_subfunc subfuncs;
/* facility list requested by guest (in dma page) */
__u64 *fac_list;

2
arch/s390/kernel/Makefile
View File

@ -41,7 +41,7 @@ obj-y += sysinfo.o lgr.o os_info.o ctlreg.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
obj-y += entry.o reipl.o kdebugfs.o alternative.o
obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
obj-y += smp.o text_amode31.o stacktrace.o abs_lowcore.o
obj-y += smp.o text_amode31.o stacktrace.o abs_lowcore.o facility.o
extra-y += vmlinux.lds

21
arch/s390/kernel/facility.c Normal file
View File

@ -0,0 +1,21 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2023
*/
#include <asm/facility.h>
unsigned int stfle_size(void)
{
static unsigned int size;
unsigned int r;
u64 dummy;
r = READ_ONCE(size);
if (!r) {
r = __stfle_asm(&dummy, 1) + 1;
WRITE_ONCE(size, r);
}
return r;
}
EXPORT_SYMBOL(stfle_size);

5
arch/s390/kvm/Kconfig
View File

@ -20,19 +20,16 @@ config KVM
def_tristate y
prompt "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
select HAVE_KVM_VCPU_ASYNC_IOCTL
select HAVE_KVM_EVENTFD
select KVM_ASYNC_PF
select KVM_ASYNC_PF_SYNC
select KVM_COMMON
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_INVALID_WAKEUPS
select HAVE_KVM_NO_POLL
select KVM_VFIO
select INTERVAL_TREE
select MMU_NOTIFIER
help
Support hosting paravirtualized guest machines using the SIE

4
arch/s390/kvm/guestdbg.c
View File

@ -213,8 +213,8 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
else if (dbg->arch.nr_hw_bp > MAX_BP_COUNT)
return -EINVAL;
bp_data = memdup_user(dbg->arch.hw_bp,
sizeof(*bp_data) * dbg->arch.nr_hw_bp);
bp_data = memdup_array_user(dbg->arch.hw_bp, dbg->arch.nr_hw_bp,
sizeof(*bp_data));
if (IS_ERR(bp_data))
return PTR_ERR(bp_data);

1
arch/s390/kvm/kvm-s390.c
View File

@ -563,7 +563,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_S390_CSS_SUPPORT:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_S390_IRQCHIP:
case KVM_CAP_VM_ATTRIBUTES:
case KVM_CAP_MP_STATE:

19
arch/s390/kvm/vsie.c
View File

@ -19,6 +19,7 @@
#include <asm/nmi.h>
#include <asm/dis.h>
#include <asm/fpu/api.h>
#include <asm/facility.h>
#include "kvm-s390.h"
#include "gaccess.h"
@ -984,12 +985,26 @@ static void retry_vsie_icpt(struct vsie_page *vsie_page)
static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
__u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U;
__u32 fac = READ_ONCE(vsie_page->scb_o->fac);
/*
* Alternate-STFLE-Interpretive-Execution facilities are not supported
* -> format-0 flcb
*/
if (fac && test_kvm_facility(vcpu->kvm, 7)) {
retry_vsie_icpt(vsie_page);
/*
* The facility list origin (FLO) is in bits 1 - 28 of the FLD
* so we need to mask here before reading.
*/
fac = fac & 0x7ffffff8U;
/*
* format-0 -> size of nested guest's facility list == guest's size
* guest's size == host's size, since STFLE is interpretatively executed
* using a format-0 for the guest, too.
*/
if (read_guest_real(vcpu, fac, &vsie_page->fac,
sizeof(vsie_page->fac)))
stfle_size() * sizeof(u64)))
return set_validity_icpt(scb_s, 0x1090U);
scb_s->fac = (__u32)(__u64) &vsie_page->fac;
}

3
arch/x86/include/asm/kvm-x86-ops.h
View File

@ -55,8 +55,10 @@ KVM_X86_OP(set_rflags)
KVM_X86_OP(get_if_flag)
KVM_X86_OP(flush_tlb_all)
KVM_X86_OP(flush_tlb_current)
#if IS_ENABLED(CONFIG_HYPERV)
KVM_X86_OP_OPTIONAL(flush_remote_tlbs)
KVM_X86_OP_OPTIONAL(flush_remote_tlbs_range)
#endif
KVM_X86_OP(flush_tlb_gva)
KVM_X86_OP(flush_tlb_guest)
KVM_X86_OP(vcpu_pre_run)
@ -135,6 +137,7 @@ KVM_X86_OP(msr_filter_changed)
KVM_X86_OP(complete_emulated_msr)
KVM_X86_OP(vcpu_deliver_sipi_vector)
KVM_X86_OP_OPTIONAL_RET0(vcpu_get_apicv_inhibit_reasons);
KVM_X86_OP_OPTIONAL(get_untagged_addr)
#undef KVM_X86_OP
#undef KVM_X86_OP_OPTIONAL

2
arch/x86/include/asm/kvm-x86-pmu-ops.h
View File

@ -22,7 +22,7 @@ KVM_X86_PMU_OP(get_msr)
KVM_X86_PMU_OP(set_msr)
KVM_X86_PMU_OP(refresh)
KVM_X86_PMU_OP(init)
KVM_X86_PMU_OP(reset)
KVM_X86_PMU_OP_OPTIONAL(reset)
KVM_X86_PMU_OP_OPTIONAL(deliver_pmi)
KVM_X86_PMU_OP_OPTIONAL(cleanup)

75
arch/x86/include/asm/kvm_host.h
View File

@ -133,7 +133,8 @@
| X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
| X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
| X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
| X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))
| X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP \
| X86_CR4_LAM_SUP))
#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
@ -500,8 +501,23 @@ struct kvm_pmc {
u8 idx;
bool is_paused;
bool intr;
/*
* Base value of the PMC counter, relative to the *consumed* count in
* the associated perf_event. This value includes counter updates from
* the perf_event and emulated_count since the last time the counter
* was reprogrammed, but it is *not* the current value as seen by the
* guest or userspace.
*
* The count is relative to the associated perf_event so that KVM
* doesn't need to reprogram the perf_event every time the guest writes
* to the counter.
*/
u64 counter;
u64 prev_counter;
/*
* PMC events triggered by KVM emulation that haven't been fully
* processed, i.e. haven't undergone overflow detection.
*/
u64 emulated_counter;
u64 eventsel;
struct perf_event *perf_event;
struct kvm_vcpu *vcpu;
@ -937,8 +953,10 @@ struct kvm_vcpu_arch {
/* used for guest single stepping over the given code position */
unsigned long singlestep_rip;
#ifdef CONFIG_KVM_HYPERV
bool hyperv_enabled;
struct kvm_vcpu_hv *hyperv;
#endif
#ifdef CONFIG_KVM_XEN
struct kvm_vcpu_xen xen;
#endif
@ -1095,6 +1113,7 @@ enum hv_tsc_page_status {
HV_TSC_PAGE_BROKEN,
};
#ifdef CONFIG_KVM_HYPERV
/* Hyper-V emulation context */
struct kvm_hv {
struct mutex hv_lock;
@ -1125,9 +1144,9 @@ struct kvm_hv {
*/
unsigned int synic_auto_eoi_used;
struct hv_partition_assist_pg *hv_pa_pg;
struct kvm_hv_syndbg hv_syndbg;
};
#endif
struct msr_bitmap_range {
u32 flags;
@ -1136,6 +1155,7 @@ struct msr_bitmap_range {
unsigned long *bitmap;
};
#ifdef CONFIG_KVM_XEN
/* Xen emulation context */
struct kvm_xen {
struct mutex xen_lock;
@ -1147,6 +1167,7 @@ struct kvm_xen {
struct idr evtchn_ports;
unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
};
#endif
enum kvm_irqchip_mode {
KVM_IRQCHIP_NONE,
@ -1255,6 +1276,7 @@ enum kvm_apicv_inhibit {
};
struct kvm_arch {
unsigned long vm_type;
unsigned long n_used_mmu_pages;
unsigned long n_requested_mmu_pages;
unsigned long n_max_mmu_pages;
@ -1347,8 +1369,13 @@ struct kvm_arch {
/* reads protected by irq_srcu, writes by irq_lock */
struct hlist_head mask_notifier_list;
#ifdef CONFIG_KVM_HYPERV
struct kvm_hv hyperv;
#endif
#ifdef CONFIG_KVM_XEN
struct kvm_xen xen;
#endif
bool backwards_tsc_observed;
bool boot_vcpu_runs_old_kvmclock;
@ -1406,9 +1433,8 @@ struct kvm_arch {
* the MMU lock in read mode + RCU or
* the MMU lock in write mode
*
* For writes, this list is protected by:
* the MMU lock in read mode + the tdp_mmu_pages_lock or
* the MMU lock in write mode
* For writes, this list is protected by tdp_mmu_pages_lock; see
* below for the details.
*
* Roots will remain in the list until their tdp_mmu_root_count
* drops to zero, at which point the thread that decremented the
@ -1425,8 +1451,10 @@ struct kvm_arch {
* - possible_nx_huge_pages;
* - the possible_nx_huge_page_link field of kvm_mmu_page structs used
* by the TDP MMU
* It is acceptable, but not necessary, to acquire this lock when
* the thread holds the MMU lock in write mode.
* Because the lock is only taken within the MMU lock, strictly
* speaking it is redundant to acquire this lock when the thread
* holds the MMU lock in write mode. However it often simplifies
* the code to do so.
*/
spinlock_t tdp_mmu_pages_lock;
#endif /* CONFIG_X86_64 */
@ -1441,6 +1469,7 @@ struct kvm_arch {
#if IS_ENABLED(CONFIG_HYPERV)
hpa_t hv_root_tdp;
spinlock_t hv_root_tdp_lock;
struct hv_partition_assist_pg *hv_pa_pg;
#endif
/*
* VM-scope maximum vCPU ID. Used to determine the size of structures
@ -1613,9 +1642,11 @@ struct kvm_x86_ops {
void (*flush_tlb_all)(struct kvm_vcpu *vcpu);
void (*flush_tlb_current)(struct kvm_vcpu *vcpu);
#if IS_ENABLED(CONFIG_HYPERV)
int (*flush_remote_tlbs)(struct kvm *kvm);
int (*flush_remote_tlbs_range)(struct kvm *kvm, gfn_t gfn,
gfn_t nr_pages);
#endif
/*
* Flush any TLB entries associated with the given GVA.
@ -1761,6 +1792,8 @@ struct kvm_x86_ops {
* Returns vCPU specific APICv inhibit reasons
*/
unsigned long (*vcpu_get_apicv_inhibit_reasons)(struct kvm_vcpu *vcpu);
gva_t (*get_untagged_addr)(struct kvm_vcpu *vcpu, gva_t gva, unsigned int flags);
};
struct kvm_x86_nested_ops {
@ -1824,6 +1857,7 @@ static inline struct kvm *kvm_arch_alloc_vm(void)
#define __KVM_HAVE_ARCH_VM_FREE
void kvm_arch_free_vm(struct kvm *kvm);
#if IS_ENABLED(CONFIG_HYPERV)
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
{
@ -1835,6 +1869,15 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
}
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn,
u64 nr_pages)
{
if (!kvm_x86_ops.flush_remote_tlbs_range)
return -EOPNOTSUPP;
return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages);
}
#endif /* CONFIG_HYPERV */
#define kvm_arch_pmi_in_guest(vcpu) \
((vcpu) && (vcpu)->arch.handling_intr_from_guest)
@ -1848,6 +1891,9 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu);
void kvm_mmu_init_vm(struct kvm *kvm);
void kvm_mmu_uninit_vm(struct kvm *kvm);
void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm,
struct kvm_memory_slot *slot);
void kvm_mmu_after_set_cpuid(struct kvm_vcpu *vcpu);
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
@ -2086,6 +2132,12 @@ void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd);
void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
int tdp_max_root_level, int tdp_huge_page_level);
#ifdef CONFIG_KVM_PRIVATE_MEM
#define kvm_arch_has_private_mem(kvm) ((kvm)->arch.vm_type != KVM_X86_DEFAULT_VM)
#else
#define kvm_arch_has_private_mem(kvm) false
#endif
static inline u16 kvm_read_ldt(void)
{
u16 ldt;
@ -2133,16 +2185,15 @@ enum {
#define HF_SMM_MASK (1 << 1)
#define HF_SMM_INSIDE_NMI_MASK (1 << 2)
# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
# define KVM_ADDRESS_SPACE_NUM 2
# define KVM_MAX_NR_ADDRESS_SPACES 2
/* SMM is currently unsupported for guests with private memory. */
# define kvm_arch_nr_memslot_as_ids(kvm) (kvm_arch_has_private_mem(kvm) ? 1 : 2)
# define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)
#else
# define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, 0)
#endif
#define KVM_ARCH_WANT_MMU_NOTIFIER
int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
int kvm_cpu_has_extint(struct kvm_vcpu *v);

3
arch/x86/include/uapi/asm/kvm.h
View File

@ -562,4 +562,7 @@ struct kvm_pmu_event_filter {
/* x86-specific KVM_EXIT_HYPERCALL flags. */
#define KVM_EXIT_HYPERCALL_LONG_MODE BIT(0)
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_SW_PROTECTED_VM 1
#endif /* _ASM_X86_KVM_H */

10
arch/x86/kernel/kvmclock.c
View File

@ -24,8 +24,8 @@
static int kvmclock __initdata = 1;
static int kvmclock_vsyscall __initdata = 1;
static int msr_kvm_system_time __ro_after_init = MSR_KVM_SYSTEM_TIME;
static int msr_kvm_wall_clock __ro_after_init = MSR_KVM_WALL_CLOCK;
static int msr_kvm_system_time __ro_after_init;
static int msr_kvm_wall_clock __ro_after_init;
static u64 kvm_sched_clock_offset __ro_after_init;
static int __init parse_no_kvmclock(char *arg)
@ -195,6 +195,7 @@ static void kvm_setup_secondary_clock(void)
void kvmclock_disable(void)
{
if (msr_kvm_system_time)
native_write_msr(msr_kvm_system_time, 0, 0);
}
@ -294,7 +295,10 @@ void __init kvmclock_init(void)
if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {
msr_kvm_system_time = MSR_KVM_SYSTEM_TIME_NEW;
msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK_NEW;
} else if (!kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)) {
} else if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)) {
msr_kvm_system_time = MSR_KVM_SYSTEM_TIME;
msr_kvm_wall_clock = MSR_KVM_WALL_CLOCK;
} else {
return;
}

47
arch/x86/kvm/Kconfig
View File

@ -23,17 +23,15 @@ config KVM
depends on HAVE_KVM
depends on HIGH_RES_TIMERS
depends on X86_LOCAL_APIC
select PREEMPT_NOTIFIERS
select MMU_NOTIFIER
select KVM_COMMON
select KVM_GENERIC_MMU_NOTIFIER
select HAVE_KVM_IRQCHIP
select HAVE_KVM_PFNCACHE
select HAVE_KVM_IRQFD
select HAVE_KVM_DIRTY_RING_TSO
select HAVE_KVM_DIRTY_RING_ACQ_REL
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_EVENTFD
select KVM_ASYNC_PF
select USER_RETURN_NOTIFIER
select KVM_MMIO
@ -46,7 +44,6 @@ config KVM
select KVM_XFER_TO_GUEST_WORK
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_VFIO
select INTERVAL_TREE
select HAVE_KVM_PM_NOTIFIER if PM
select KVM_GENERIC_HARDWARE_ENABLING
help
@ -65,18 +62,30 @@ config KVM
config KVM_WERROR
bool "Compile KVM with -Werror"
# KASAN may cause the build to fail due to larger frames
default y if X86_64 && !KASAN
# We use the dependency on !COMPILE_TEST to not be enabled
# blindly in allmodconfig or allyesconfig configurations
depends on KVM
depends on (X86_64 && !KASAN) || !COMPILE_TEST
depends on EXPERT
# Disallow KVM's -Werror if KASAN is enabled, e.g. to guard against
# randomized configs from selecting KVM_WERROR=y, which doesn't play
# nice with KASAN. KASAN builds generates warnings for the default
# FRAME_WARN, i.e. KVM_WERROR=y with KASAN=y requires special tuning.
# Building KVM with -Werror and KASAN is still doable via enabling
# the kernel-wide WERROR=y.
depends on KVM && EXPERT && !KASAN
help
Add -Werror to the build flags for KVM.
If in doubt, say "N".
config KVM_SW_PROTECTED_VM
bool "Enable support for KVM software-protected VMs"
depends on EXPERT
depends on KVM && X86_64
select KVM_GENERIC_PRIVATE_MEM
help
Enable support for KVM software-protected VMs. Currently "protected"
means the VM can be backed with memory provided by
KVM_CREATE_GUEST_MEMFD.
If unsure, say "N".
config KVM_INTEL
tristate "KVM for Intel (and compatible) processors support"
depends on KVM && IA32_FEAT_CTL
@ -129,6 +138,20 @@ config KVM_SMM
If unsure, say Y.
config KVM_HYPERV
bool "Support for Microsoft Hyper-V emulation"
depends on KVM
default y
help
Provides KVM support for emulating Microsoft Hyper-V. This allows KVM
to expose a subset of the paravirtualized interfaces defined in the
Hyper-V Hypervisor Top-Level Functional Specification (TLFS):
https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs
These interfaces are required for the correct and performant functioning
of Windows and Hyper-V guests on KVM.
If unsure, say "Y".
config KVM_XEN
bool "Support for Xen hypercall interface"
depends on KVM

16
arch/x86/kvm/Makefile
View File

@ -11,25 +11,27 @@ include $(srctree)/virt/kvm/Makefile.kvm
kvm-y += x86.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
hyperv.o debugfs.o mmu/mmu.o mmu/page_track.o \
debugfs.o mmu/mmu.o mmu/page_track.o \
mmu/spte.o
ifdef CONFIG_HYPERV
kvm-y += kvm_onhyperv.o
endif
kvm-$(CONFIG_X86_64) += mmu/tdp_iter.o mmu/tdp_mmu.o
kvm-$(CONFIG_KVM_HYPERV) += hyperv.o
kvm-$(CONFIG_KVM_XEN) += xen.o
kvm-$(CONFIG_KVM_SMM) += smm.o
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o \
vmx/hyperv.o vmx/nested.o vmx/posted_intr.o
vmx/nested.o vmx/posted_intr.o
kvm-intel-$(CONFIG_X86_SGX_KVM) += vmx/sgx.o
kvm-intel-$(CONFIG_KVM_HYPERV) += vmx/hyperv.o vmx/hyperv_evmcs.o
kvm-amd-y += svm/svm.o svm/vmenter.o svm/pmu.o svm/nested.o svm/avic.o \
svm/sev.o svm/hyperv.o
svm/sev.o
kvm-amd-$(CONFIG_KVM_HYPERV) += svm/hyperv.o
ifdef CONFIG_HYPERV
kvm-y += kvm_onhyperv.o
kvm-intel-y += vmx/vmx_onhyperv.o vmx/hyperv_evmcs.o
kvm-amd-y += svm/svm_onhyperv.o
endif

33
arch/x86/kvm/cpuid.c
View File

@ -314,11 +314,15 @@ EXPORT_SYMBOL_GPL(kvm_update_cpuid_runtime);
static bool kvm_cpuid_has_hyperv(struct kvm_cpuid_entry2 *entries, int nent)
{
#ifdef CONFIG_KVM_HYPERV
struct kvm_cpuid_entry2 *entry;
entry = cpuid_entry2_find(entries, nent, HYPERV_CPUID_INTERFACE,
KVM_CPUID_INDEX_NOT_SIGNIFICANT);
return entry && entry->eax == HYPERV_CPUID_SIGNATURE_EAX;
#else
return false;
#endif
}
static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
@ -433,11 +437,13 @@ static int kvm_set_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid_entry2 *e2,
return 0;
}
#ifdef CONFIG_KVM_HYPERV
if (kvm_cpuid_has_hyperv(e2, nent)) {
r = kvm_hv_vcpu_init(vcpu);
if (r)
return r;
}
#endif
r = kvm_check_cpuid(vcpu, e2, nent);
if (r)
@ -469,7 +475,7 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
return -E2BIG;
if (cpuid->nent) {
e = vmemdup_user(entries, array_size(sizeof(*e), cpuid->nent));
e = vmemdup_array_user(entries, cpuid->nent, sizeof(*e));
if (IS_ERR(e))
return PTR_ERR(e);
@ -513,7 +519,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
return -E2BIG;
if (cpuid->nent) {
e2 = vmemdup_user(entries, array_size(sizeof(*e2), cpuid->nent));
e2 = vmemdup_array_user(entries, cpuid->nent, sizeof(*e2));
if (IS_ERR(e2))
return PTR_ERR(e2);
}
@ -671,7 +677,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_7_1_EAX,
F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) |
F(FZRM) | F(FSRS) | F(FSRC) |
F(AMX_FP16) | F(AVX_IFMA)
F(AMX_FP16) | F(AVX_IFMA) | F(LAM)
);
kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,
@ -679,6 +685,11 @@ void kvm_set_cpu_caps(void)
F(AMX_COMPLEX)
);
kvm_cpu_cap_init_kvm_defined(CPUID_7_2_EDX,
F(INTEL_PSFD) | F(IPRED_CTRL) | F(RRSBA_CTRL) | F(DDPD_U) |
F(BHI_CTRL) | F(MCDT_NO)
);
kvm_cpu_cap_mask(CPUID_D_1_EAX,
F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) | f_xfd
);
@ -960,13 +971,13 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
break;
/* function 7 has additional index. */
case 7:
entry->eax = min(entry->eax, 1u);
max_idx = entry->eax = min(entry->eax, 2u);
cpuid_entry_override(entry, CPUID_7_0_EBX);
cpuid_entry_override(entry, CPUID_7_ECX);
cpuid_entry_override(entry, CPUID_7_EDX);
/* KVM only supports 0x7.0 and 0x7.1, capped above via min(). */
if (entry->eax == 1) {
/* KVM only supports up to 0x7.2, capped above via min(). */
if (max_idx >= 1) {
entry = do_host_cpuid(array, function, 1);
if (!entry)
goto out;
@ -976,6 +987,16 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
entry->ebx = 0;
entry->ecx = 0;
}
if (max_idx >= 2) {
entry = do_host_cpuid(array, function, 2);
if (!entry)
goto out;
cpuid_entry_override(entry, CPUID_7_2_EDX);
entry->ecx = 0;
entry->ebx = 0;
entry->eax = 0;
}
break;
case 0xa: { /* Architectural Performance Monitoring */
union cpuid10_eax eax;

13
arch/x86/kvm/cpuid.h
View File

@ -47,11 +47,6 @@ static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
return !(gpa & vcpu->arch.reserved_gpa_bits);
}
static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
{
return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
}
static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
gpa_t gpa, gpa_t alignment)
{
@ -279,4 +274,12 @@ static __always_inline bool guest_can_use(struct kvm_vcpu *vcpu,
vcpu->arch.governed_features.enabled);
}
static inline bool kvm_vcpu_is_legal_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
if (guest_can_use(vcpu, X86_FEATURE_LAM))
cr3 &= ~(X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
return kvm_vcpu_is_legal_gpa(vcpu, cr3);
}
#endif

2
arch/x86/kvm/debugfs.c
View File

@ -111,7 +111,7 @@ static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v)
mutex_lock(&kvm->slots_lock);
write_lock(&kvm->mmu_lock);
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
int bkt;
slots = __kvm_memslots(kvm, i);

27
arch/x86/kvm/emulate.c
View File

@ -687,8 +687,8 @@ static unsigned insn_alignment(struct x86_emulate_ctxt *ctxt, unsigned size)
static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
struct segmented_address addr,
unsigned *max_size, unsigned size,
bool write, bool fetch,
enum x86emul_mode mode, ulong *linear)
enum x86emul_mode mode, ulong *linear,
unsigned int flags)
{
struct desc_struct desc;
bool usable;
@ -701,7 +701,7 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
*max_size = 0;
switch (mode) {
case X86EMUL_MODE_PROT64:
*linear = la;
*linear = la = ctxt->ops->get_untagged_addr(ctxt, la, flags);
va_bits = ctxt_virt_addr_bits(ctxt);
if (!__is_canonical_address(la, va_bits))
goto bad;
@ -717,11 +717,11 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
if (!usable)
goto bad;
/* code segment in protected mode or read-only data segment */
if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8))
|| !(desc.type & 2)) && write)
if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8)) || !(desc.type & 2)) &&
(flags & X86EMUL_F_WRITE))
goto bad;
/* unreadable code segment */
if (!fetch && (desc.type & 8) && !(desc.type & 2))
if (!(flags & X86EMUL_F_FETCH) && (desc.type & 8) && !(desc.type & 2))
goto bad;
lim = desc_limit_scaled(&desc);
if (!(desc.type & 8) && (desc.type & 4)) {
@ -757,8 +757,8 @@ static int linearize(struct x86_emulate_ctxt *ctxt,
ulong *linear)
{
unsigned max_size;
return __linearize(ctxt, addr, &max_size, size, write, false,
ctxt->mode, linear);
return __linearize(ctxt, addr, &max_size, size, ctxt->mode, linear,
write ? X86EMUL_F_WRITE : 0);
}
static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst)
@ -771,7 +771,8 @@ static inline int assign_eip(struct x86_emulate_ctxt *ctxt, ulong dst)
if (ctxt->op_bytes != sizeof(unsigned long))
addr.ea = dst & ((1UL << (ctxt->op_bytes << 3)) - 1);
rc = __linearize(ctxt, addr, &max_size, 1, false, true, ctxt->mode, &linear);
rc = __linearize(ctxt, addr, &max_size, 1, ctxt->mode, &linear,
X86EMUL_F_FETCH);
if (rc == X86EMUL_CONTINUE)
ctxt->_eip = addr.ea;
return rc;
@ -907,8 +908,8 @@ static int __do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt, int op_size)
* boundary check itself. Instead, we use max_size to check
* against op_size.
*/
rc = __linearize(ctxt, addr, &max_size, 0, false, true, ctxt->mode,
&linear);
rc = __linearize(ctxt, addr, &max_size, 0, ctxt->mode, &linear,
X86EMUL_F_FETCH);
if (unlikely(rc != X86EMUL_CONTINUE))
return rc;
@ -3439,8 +3440,10 @@ static int em_invlpg(struct x86_emulate_ctxt *ctxt)
{
int rc;
ulong linear;
unsigned int max_size;
rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
rc = __linearize(ctxt, ctxt->src.addr.mem, &max_size, 1, ctxt->mode,
&linear, X86EMUL_F_INVLPG);
if (rc == X86EMUL_CONTINUE)
ctxt->ops->invlpg(ctxt, linear);
/* Disable writeback. */

1
arch/x86/kvm/governed_features.h
View File

@ -16,6 +16,7 @@ KVM_GOVERNED_X86_FEATURE(PAUSEFILTER)
KVM_GOVERNED_X86_FEATURE(PFTHRESHOLD)
KVM_GOVERNED_X86_FEATURE(VGIF)
KVM_GOVERNED_X86_FEATURE(VNMI)
KVM_GOVERNED_X86_FEATURE(LAM)
#undef KVM_GOVERNED_X86_FEATURE
#undef KVM_GOVERNED_FEATURE

87
arch/x86/kvm/hyperv.h
View File

@ -24,6 +24,8 @@
#include <linux/kvm_host.h>
#include "x86.h"
#ifdef CONFIG_KVM_HYPERV
/* "Hv#1" signature */
#define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
@ -105,6 +107,17 @@ int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages);
static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector)
{
return to_hv_vcpu(vcpu) && test_bit(vector, to_hv_synic(vcpu)->vec_bitmap);
}
static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector)
{
return to_hv_vcpu(vcpu) &&
test_bit(vector, to_hv_synic(vcpu)->auto_eoi_bitmap);
}
void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu);
bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu);
@ -236,6 +249,76 @@ static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu)
return kvm_hv_get_assist_page(vcpu);
}
int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu,
bool tdp_enabled)
{
/*
* KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or
* L2's VP_ID upon request from the guest. Make sure we check for
* pending entries in the right FIFO upon L1/L2 transition as these
* requests are put by other vCPUs asynchronously.
*/
if (to_hv_vcpu(vcpu) && tdp_enabled)
kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);
}
#endif
int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);
#else /* CONFIG_KVM_HYPERV */
static inline void kvm_hv_setup_tsc_page(struct kvm *kvm,
struct pvclock_vcpu_time_info *hv_clock) {}
static inline void kvm_hv_request_tsc_page_update(struct kvm *kvm) {}
static inline void kvm_hv_init_vm(struct kvm *kvm) {}
static inline void kvm_hv_destroy_vm(struct kvm *kvm) {}
static inline int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu) {}
static inline bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu)
{
return false;
}
static inline int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
{
return HV_STATUS_ACCESS_DENIED;
}
static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) {}
static inline void kvm_hv_free_pa_page(struct kvm *kvm) {}
static inline bool kvm_hv_synic_has_vector(struct kvm_vcpu *vcpu, int vector)
{
return false;
}
static inline bool kvm_hv_synic_auto_eoi_set(struct kvm_vcpu *vcpu, int vector)
{
return false;
}
static inline void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector) {}
static inline bool kvm_hv_invtsc_suppressed(struct kvm_vcpu *vcpu)
{
return false;
}
static inline void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu, bool hyperv_enabled) {}
static inline bool kvm_hv_has_stimer_pending(struct kvm_vcpu *vcpu)
{
return false;
}
static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu)
{
return false;
}
static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu)
{
return false;
}
static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu)
{
return 0;
}
static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu)
{
return vcpu->vcpu_idx;
}
static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu, bool tdp_enabled) {}
#endif /* CONFIG_KVM_HYPERV */
#endif /* __ARCH_X86_KVM_HYPERV_H__ */

2
arch/x86/kvm/irq.c
View File

@ -118,8 +118,10 @@ static int kvm_cpu_get_extint(struct kvm_vcpu *v)
if (!lapic_in_kernel(v))
return v->arch.interrupt.nr;
#ifdef CONFIG_KVM_XEN
if (kvm_xen_has_interrupt(v))
return v->kvm->arch.xen.upcall_vector;
#endif
if (irqchip_split(v->kvm)) {
int vector = v->arch.pending_external_vector;

9
arch/x86/kvm/irq_comm.c
View File

@ -144,7 +144,7 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
}
#ifdef CONFIG_KVM_HYPERV
static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level,
bool line_status)
@ -154,6 +154,7 @@ static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint);
}
#endif
int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level,
@ -163,9 +164,11 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
int r;
switch (e->type) {
#ifdef CONFIG_KVM_HYPERV
case KVM_IRQ_ROUTING_HV_SINT:
return kvm_hv_set_sint(e, kvm, irq_source_id, level,
line_status);
#endif
case KVM_IRQ_ROUTING_MSI:
if (kvm_msi_route_invalid(kvm, e))
@ -314,11 +317,13 @@ int kvm_set_routing_entry(struct kvm *kvm,
if (kvm_msi_route_invalid(kvm, e))
return -EINVAL;
break;
#ifdef CONFIG_KVM_HYPERV
case KVM_IRQ_ROUTING_HV_SINT:
e->set = kvm_hv_set_sint;
e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
e->hv_sint.sint = ue->u.hv_sint.sint;
break;
#endif
#ifdef CONFIG_KVM_XEN
case KVM_IRQ_ROUTING_XEN_EVTCHN:
return kvm_xen_setup_evtchn(kvm, e, ue);
@ -438,5 +443,7 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
void kvm_arch_irq_routing_update(struct kvm *kvm)
{
#ifdef CONFIG_KVM_HYPERV
kvm_hv_irq_routing_update(kvm);
#endif
}

9
arch/x86/kvm/kvm_emulate.h
View File

@ -88,6 +88,12 @@ struct x86_instruction_info {
#define X86EMUL_IO_NEEDED 5 /* IO is needed to complete emulation */
#define X86EMUL_INTERCEPTED 6 /* Intercepted by nested VMCB/VMCS */
/* x86-specific emulation flags */
#define X86EMUL_F_WRITE BIT(0)
#define X86EMUL_F_FETCH BIT(1)
#define X86EMUL_F_IMPLICIT BIT(2)
#define X86EMUL_F_INVLPG BIT(3)
struct x86_emulate_ops {
void (*vm_bugged)(struct x86_emulate_ctxt *ctxt);
/*
@ -224,6 +230,9 @@ struct x86_emulate_ops {
int (*leave_smm)(struct x86_emulate_ctxt *ctxt);
void (*triple_fault)(struct x86_emulate_ctxt *ctxt);
int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
gva_t (*get_untagged_addr)(struct x86_emulate_ctxt *ctxt, gva_t addr,
unsigned int flags);
};
/* Type, address-of, and value of an instruction's operand. */

20
arch/x86/kvm/kvm_onhyperv.h
View File

@ -10,6 +10,26 @@
int hv_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, gfn_t nr_pages);
int hv_flush_remote_tlbs(struct kvm *kvm);
void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp);
static inline hpa_t hv_get_partition_assist_page(struct kvm_vcpu *vcpu)
{
/*
* Partition assist page is something which Hyper-V running in L0
* requires from KVM running in L1 before direct TLB flush for L2
* guests can be enabled. KVM doesn't currently use the page but to
* comply with TLFS it still needs to be allocated. For now, this
* is a single page shared among all vCPUs.
*/
struct hv_partition_assist_pg **p_hv_pa_pg =
&vcpu->kvm->arch.hv_pa_pg;
if (!*p_hv_pa_pg)
*p_hv_pa_pg = kzalloc(PAGE_SIZE, GFP_KERNEL_ACCOUNT);
if (!*p_hv_pa_pg)
return INVALID_PAGE;
return __pa(*p_hv_pa_pg);
}
#else /* !CONFIG_HYPERV */
static inline int hv_flush_remote_tlbs(struct kvm *kvm)
{

5
arch/x86/kvm/lapic.c
View File

@ -1475,8 +1475,7 @@ static int apic_set_eoi(struct kvm_lapic *apic)
apic_clear_isr(vector, apic);
apic_update_ppr(apic);
if (to_hv_vcpu(apic->vcpu) &&
test_bit(vector, to_hv_synic(apic->vcpu)->vec_bitmap))
if (kvm_hv_synic_has_vector(apic->vcpu, vector))
kvm_hv_synic_send_eoi(apic->vcpu, vector);
kvm_ioapic_send_eoi(apic, vector);
@ -2905,7 +2904,7 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
*/
apic_clear_irr(vector, apic);
if (to_hv_vcpu(vcpu) && test_bit(vector, to_hv_synic(vcpu)->auto_eoi_bitmap)) {
if (kvm_hv_synic_auto_eoi_set(vcpu, vector)) {
/*
* For auto-EOI interrupts, there might be another pending
* interrupt above PPR, so check whether to raise another

8
arch/x86/kvm/mmu.h
View File

@ -146,6 +146,14 @@ static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
return kvm_get_pcid(vcpu, kvm_read_cr3(vcpu));
}
static inline unsigned long kvm_get_active_cr3_lam_bits(struct kvm_vcpu *vcpu)
{
if (!guest_can_use(vcpu, X86_FEATURE_LAM))
return 0;
return kvm_read_cr3(vcpu) & (X86_CR3_LAM_U48 | X86_CR3_LAM_U57);
}
static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
{
u64 root_hpa = vcpu->arch.mmu->root.hpa;

293
arch/x86/kvm/mmu/mmu.c
View File

@ -271,15 +271,11 @@ static inline unsigned long kvm_mmu_get_guest_pgd(struct kvm_vcpu *vcpu,
static inline bool kvm_available_flush_remote_tlbs_range(void)
{
#if IS_ENABLED(CONFIG_HYPERV)
return kvm_x86_ops.flush_remote_tlbs_range;
}
int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 nr_pages)
{
if (!kvm_x86_ops.flush_remote_tlbs_range)
return -EOPNOTSUPP;
return static_call(kvm_x86_flush_remote_tlbs_range)(kvm, gfn, nr_pages);
#else
return false;
#endif
}
static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index);
@ -795,16 +791,26 @@ static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn,
return &slot->arch.lpage_info[level - 2][idx];
}
/*
* The most significant bit in disallow_lpage tracks whether or not memory
* attributes are mixed, i.e. not identical for all gfns at the current level.
* The lower order bits are used to refcount other cases where a hugepage is
* disallowed, e.g. if KVM has shadow a page table at the gfn.
*/
#define KVM_LPAGE_MIXED_FLAG BIT(31)
static void update_gfn_disallow_lpage_count(const struct kvm_memory_slot *slot,
gfn_t gfn, int count)
{
struct kvm_lpage_info *linfo;
int i;
int old, i;
for (i = PG_LEVEL_2M; i <= KVM_MAX_HUGEPAGE_LEVEL; ++i) {
linfo = lpage_info_slot(gfn, slot, i);
old = linfo->disallow_lpage;
linfo->disallow_lpage += count;
WARN_ON_ONCE(linfo->disallow_lpage < 0);
WARN_ON_ONCE((old ^ linfo->disallow_lpage) & KVM_LPAGE_MIXED_FLAG);
}
}
@ -1382,7 +1388,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
gfn_t end = slot->base_gfn + gfn_offset + __fls(mask);
if (READ_ONCE(eager_page_split))
kvm_mmu_try_split_huge_pages(kvm, slot, start, end, PG_LEVEL_4K);
kvm_mmu_try_split_huge_pages(kvm, slot, start, end + 1, PG_LEVEL_4K);
kvm_mmu_slot_gfn_write_protect(kvm, slot, start, PG_LEVEL_2M);
@ -2840,9 +2846,9 @@ int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot,
/*
* Recheck after taking the spinlock, a different vCPU
* may have since marked the page unsync. A false
* positive on the unprotected check above is not
* negative on the unprotected check above is not
* possible as clearing sp->unsync _must_ hold mmu_lock
* for write, i.e. unsync cannot transition from 0->1
* for write, i.e. unsync cannot transition from 1->0
* while this CPU holds mmu_lock for read (or write).
*/
if (READ_ONCE(sp->unsync))
@ -3056,7 +3062,7 @@ static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep)
*
* There are several ways to safely use this helper:
*
* - Check mmu_invalidate_retry_hva() after grabbing the mapping level, before
* - Check mmu_invalidate_retry_gfn() after grabbing the mapping level, before
* consuming it. In this case, mmu_lock doesn't need to be held during the
* lookup, but it does need to be held while checking the MMU notifier.
*
@ -3137,9 +3143,9 @@ static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn,
return level;
}
int kvm_mmu_max_mapping_level(struct kvm *kvm,
const struct kvm_memory_slot *slot, gfn_t gfn,
int max_level)
static int __kvm_mmu_max_mapping_level(struct kvm *kvm,
const struct kvm_memory_slot *slot,
gfn_t gfn, int max_level, bool is_private)
{
struct kvm_lpage_info *linfo;
int host_level;
@ -3151,6 +3157,9 @@ int kvm_mmu_max_mapping_level(struct kvm *kvm,
break;
}
if (is_private)
return max_level;
if (max_level == PG_LEVEL_4K)
return PG_LEVEL_4K;
@ -3158,6 +3167,16 @@ int kvm_mmu_max_mapping_level(struct kvm *kvm,
return min(host_level, max_level);
}
int kvm_mmu_max_mapping_level(struct kvm *kvm,
const struct kvm_memory_slot *slot, gfn_t gfn,
int max_level)
{
bool is_private = kvm_slot_can_be_private(slot) &&
kvm_mem_is_private(kvm, gfn);
return __kvm_mmu_max_mapping_level(kvm, slot, gfn, max_level, is_private);
}
void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
{
struct kvm_memory_slot *slot = fault->slot;
@ -3178,8 +3197,9 @@ void kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
* Enforce the iTLB multihit workaround after capturing the requested
* level, which will be used to do precise, accurate accounting.
*/
fault->req_level = kvm_mmu_max_mapping_level(vcpu->kvm, slot,
fault->gfn, fault->max_level);
fault->req_level = __kvm_mmu_max_mapping_level(vcpu->kvm, slot,
fault->gfn, fault->max_level,
fault->is_private);
if (fault->req_level == PG_LEVEL_4K || fault->huge_page_disallowed)
return;
@ -3556,7 +3576,7 @@ static void mmu_free_root_page(struct kvm *kvm, hpa_t *root_hpa,
return;
if (is_tdp_mmu_page(sp))
kvm_tdp_mmu_put_root(kvm, sp, false);
kvm_tdp_mmu_put_root(kvm, sp);
else if (!--sp->root_count && sp->role.invalid)
kvm_mmu_prepare_zap_page(kvm, sp, invalid_list);
@ -3739,7 +3759,7 @@ static int mmu_first_shadow_root_alloc(struct kvm *kvm)
kvm_page_track_write_tracking_enabled(kvm))
goto out_success;
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
slots = __kvm_memslots(kvm, i);
kvm_for_each_memslot(slot, bkt, slots) {
/*
@ -3782,7 +3802,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
hpa_t root;
root_pgd = kvm_mmu_get_guest_pgd(vcpu, mmu);
root_gfn = root_pgd >> PAGE_SHIFT;
root_gfn = (root_pgd & __PT_BASE_ADDR_MASK) >> PAGE_SHIFT;
if (!kvm_vcpu_is_visible_gfn(vcpu, root_gfn)) {
mmu->root.hpa = kvm_mmu_get_dummy_root();
@ -4259,6 +4279,55 @@ void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
kvm_mmu_do_page_fault(vcpu, work->cr2_or_gpa, 0, true, NULL);
}
static inline u8 kvm_max_level_for_order(int order)
{
BUILD_BUG_ON(KVM_MAX_HUGEPAGE_LEVEL > PG_LEVEL_1G);
KVM_MMU_WARN_ON(order != KVM_HPAGE_GFN_SHIFT(PG_LEVEL_1G) &&
order != KVM_HPAGE_GFN_SHIFT(PG_LEVEL_2M) &&
order != KVM_HPAGE_GFN_SHIFT(PG_LEVEL_4K));
if (order >= KVM_HPAGE_GFN_SHIFT(PG_LEVEL_1G))
return PG_LEVEL_1G;
if (order >= KVM_HPAGE_GFN_SHIFT(PG_LEVEL_2M))
return PG_LEVEL_2M;
return PG_LEVEL_4K;
}
static void kvm_mmu_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
struct kvm_page_fault *fault)
{
kvm_prepare_memory_fault_exit(vcpu, fault->gfn << PAGE_SHIFT,
PAGE_SIZE, fault->write, fault->exec,
fault->is_private);
}
static int kvm_faultin_pfn_private(struct kvm_vcpu *vcpu,
struct kvm_page_fault *fault)
{
int max_order, r;
if (!kvm_slot_can_be_private(fault->slot)) {
kvm_mmu_prepare_memory_fault_exit(vcpu, fault);
return -EFAULT;
}
r = kvm_gmem_get_pfn(vcpu->kvm, fault->slot, fault->gfn, &fault->pfn,
&max_order);
if (r) {
kvm_mmu_prepare_memory_fault_exit(vcpu, fault);
return r;
}
fault->max_level = min(kvm_max_level_for_order(max_order),
fault->max_level);
fault->map_writable = !(fault->slot->flags & KVM_MEM_READONLY);
return RET_PF_CONTINUE;
}
static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
{
struct kvm_memory_slot *slot = fault->slot;
@ -4291,6 +4360,14 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
return RET_PF_EMULATE;
}
if (fault->is_private != kvm_mem_is_private(vcpu->kvm, fault->gfn)) {
kvm_mmu_prepare_memory_fault_exit(vcpu, fault);
return -EFAULT;
}
if (fault->is_private)
return kvm_faultin_pfn_private(vcpu, fault);
async = false;
fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, false, &async,
fault->write, &fault->map_writable,
@ -4366,7 +4443,7 @@ static bool is_page_fault_stale(struct kvm_vcpu *vcpu,
return true;
return fault->slot &&
mmu_invalidate_retry_hva(vcpu->kvm, fault->mmu_seq, fault->hva);
mmu_invalidate_retry_gfn(vcpu->kvm, fault->mmu_seq, fault->gfn);
}
static int direct_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
@ -6228,7 +6305,7 @@ static bool kvm_rmap_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_e
if (!kvm_memslots_have_rmaps(kvm))
return flush;
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
slots = __kvm_memslots(kvm, i);
kvm_for_each_memslot_in_gfn_range(&iter, slots, gfn_start, gfn_end) {
@ -6260,7 +6337,9 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
write_lock(&kvm->mmu_lock);
kvm_mmu_invalidate_begin(kvm, 0, -1ul);
kvm_mmu_invalidate_begin(kvm);
kvm_mmu_invalidate_range_add(kvm, gfn_start, gfn_end);
flush = kvm_rmap_zap_gfn_range(kvm, gfn_start, gfn_end);
@ -6270,7 +6349,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
if (flush)
kvm_flush_remote_tlbs_range(kvm, gfn_start, gfn_end - gfn_start);
kvm_mmu_invalidate_end(kvm, 0, -1ul);
kvm_mmu_invalidate_end(kvm);
write_unlock(&kvm->mmu_lock);
}
@ -6723,7 +6802,7 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)
* modifier prior to checking for a wrap of the MMIO generation so
* that a wrap in any address space is detected.
*/
gen &= ~((u64)KVM_ADDRESS_SPACE_NUM - 1);
gen &= ~((u64)kvm_arch_nr_memslot_as_ids(kvm) - 1);
/*
* The very rare case: if the MMIO generation number has wrapped,
@ -7176,3 +7255,163 @@ void kvm_mmu_pre_destroy_vm(struct kvm *kvm)
if (kvm->arch.nx_huge_page_recovery_thread)
kthread_stop(kvm->arch.nx_huge_page_recovery_thread);
}
#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
struct kvm_gfn_range *range)
{
/*
* Zap SPTEs even if the slot can't be mapped PRIVATE. KVM x86 only
* supports KVM_MEMORY_ATTRIBUTE_PRIVATE, and so it *seems* like KVM
* can simply ignore such slots. But if userspace is making memory
* PRIVATE, then KVM must prevent the guest from accessing the memory
* as shared. And if userspace is making memory SHARED and this point
* is reached, then at least one page within the range was previously
* PRIVATE, i.e. the slot's possible hugepage ranges are changing.
* Zapping SPTEs in this case ensures KVM will reassess whether or not
* a hugepage can be used for affected ranges.
*/
if (WARN_ON_ONCE(!kvm_arch_has_private_mem(kvm)))
return false;
return kvm_unmap_gfn_range(kvm, range);
}
static bool hugepage_test_mixed(struct kvm_memory_slot *slot, gfn_t gfn,
int level)
{
return lpage_info_slot(gfn, slot, level)->disallow_lpage & KVM_LPAGE_MIXED_FLAG;
}
static void hugepage_clear_mixed(struct kvm_memory_slot *slot, gfn_t gfn,
int level)
{
lpage_info_slot(gfn, slot, level)->disallow_lpage &= ~KVM_LPAGE_MIXED_FLAG;
}
static void hugepage_set_mixed(struct kvm_memory_slot *slot, gfn_t gfn,
int level)
{
lpage_info_slot(gfn, slot, level)->disallow_lpage |= KVM_LPAGE_MIXED_FLAG;
}
static bool hugepage_has_attrs(struct kvm *kvm, struct kvm_memory_slot *slot,
gfn_t gfn, int level, unsigned long attrs)
{
const unsigned long start = gfn;
const unsigned long end = start + KVM_PAGES_PER_HPAGE(level);
if (level == PG_LEVEL_2M)
return kvm_range_has_memory_attributes(kvm, start, end, attrs);
for (gfn = start; gfn < end; gfn += KVM_PAGES_PER_HPAGE(level - 1)) {
if (hugepage_test_mixed(slot, gfn, level - 1) ||
attrs != kvm_get_memory_attributes(kvm, gfn))
return false;
}
return true;
}
bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
struct kvm_gfn_range *range)
{
unsigned long attrs = range->arg.attributes;
struct kvm_memory_slot *slot = range->slot;
int level;
lockdep_assert_held_write(&kvm->mmu_lock);
lockdep_assert_held(&kvm->slots_lock);
/*
* Calculate which ranges can be mapped with hugepages even if the slot
* can't map memory PRIVATE. KVM mustn't create a SHARED hugepage over
* a range that has PRIVATE GFNs, and conversely converting a range to
* SHARED may now allow hugepages.
*/
if (WARN_ON_ONCE(!kvm_arch_has_private_mem(kvm)))
return false;
/*
* The sequence matters here: upper levels consume the result of lower
* level's scanning.
*/
for (level = PG_LEVEL_2M; level <= KVM_MAX_HUGEPAGE_LEVEL; level++) {
gfn_t nr_pages = KVM_PAGES_PER_HPAGE(level);
gfn_t gfn = gfn_round_for_level(range->start, level);
/* Process the head page if it straddles the range. */
if (gfn != range->start || gfn + nr_pages > range->end) {
/*
* Skip mixed tracking if the aligned gfn isn't covered
* by the memslot, KVM can't use a hugepage due to the
* misaligned address regardless of memory attributes.
*/
if (gfn >= slot->base_gfn) {
if (hugepage_has_attrs(kvm, slot, gfn, level, attrs))
hugepage_clear_mixed(slot, gfn, level);
else
hugepage_set_mixed(slot, gfn, level);
}
gfn += nr_pages;
}
/*
* Pages entirely covered by the range are guaranteed to have
* only the attributes which were just set.
*/
for ( ; gfn + nr_pages <= range->end; gfn += nr_pages)
hugepage_clear_mixed(slot, gfn, level);
/*
* Process the last tail page if it straddles the range and is
* contained by the memslot. Like the head page, KVM can't
* create a hugepage if the slot size is misaligned.
*/
if (gfn < range->end &&
(gfn + nr_pages) <= (slot->base_gfn + slot->npages)) {
if (hugepage_has_attrs(kvm, slot, gfn, level, attrs))
hugepage_clear_mixed(slot, gfn, level);
else
hugepage_set_mixed(slot, gfn, level);
}
}
return false;
}
void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
int level;
if (!kvm_arch_has_private_mem(kvm))
return;
for (level = PG_LEVEL_2M; level <= KVM_MAX_HUGEPAGE_LEVEL; level++) {
/*
* Don't bother tracking mixed attributes for pages that can't
* be huge due to alignment, i.e. process only pages that are
* entirely contained by the memslot.
*/
gfn_t end = gfn_round_for_level(slot->base_gfn + slot->npages, level);
gfn_t start = gfn_round_for_level(slot->base_gfn, level);
gfn_t nr_pages = KVM_PAGES_PER_HPAGE(level);
gfn_t gfn;
if (start < slot->base_gfn)
start += nr_pages;
/*
* Unlike setting attributes, every potential hugepage needs to
* be manually checked as the attributes may already be mixed.
*/
for (gfn = start; gfn < end; gfn += nr_pages) {
unsigned long attrs = kvm_get_memory_attributes(kvm, gfn);
if (hugepage_has_attrs(kvm, slot, gfn, level, attrs))
hugepage_clear_mixed(slot, gfn, level);
else
hugepage_set_mixed(slot, gfn, level);
}
}
}
#endif

3
arch/x86/kvm/mmu/mmu_internal.h
View File

@ -13,6 +13,7 @@
#endif
/* Page table builder macros common to shadow (host) PTEs and guest PTEs. */
#define __PT_BASE_ADDR_MASK GENMASK_ULL(51, 12)
#define __PT_LEVEL_SHIFT(level, bits_per_level) \
(PAGE_SHIFT + ((level) - 1) * (bits_per_level))
#define __PT_INDEX(address, level, bits_per_level) \
@ -201,6 +202,7 @@ struct kvm_page_fault {
/* Derived from mmu and global state. */
const bool is_tdp;
const bool is_private;
const bool nx_huge_page_workaround_enabled;
/*
@ -296,6 +298,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
.max_level = KVM_MAX_HUGEPAGE_LEVEL,
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
.is_private = kvm_mem_is_private(vcpu->kvm, cr2_or_gpa >> PAGE_SHIFT),
};
int r;

2
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -62,7 +62,7 @@
#endif
/* Common logic, but per-type values. These also need to be undefined. */
#define PT_BASE_ADDR_MASK ((pt_element_t)(((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)))
#define PT_BASE_ADDR_MASK ((pt_element_t)__PT_BASE_ADDR_MASK)
#define PT_LVL_ADDR_MASK(lvl) __PT_LVL_ADDR_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
#define PT_LVL_OFFSET_MASK(lvl) __PT_LVL_OFFSET_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
#define PT_INDEX(addr, lvl) __PT_INDEX(addr, lvl, PT_LEVEL_BITS)

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