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KVM cleanups for 6.10:

Browse Source 
- Misc cleanups extracted from the "exit on missing userspace mapping" series,
    which has been put on hold in anticipation of a "KVM Userfault" approach,
    which should provide a superset of functionality.
 
  - Remove kvm_make_all_cpus_request_except(), which got added to hack around an
    AVIC bug, and then became dead code when a more robust fix came along.
 
  - Fix a goof in the KVM_CREATE_GUEST_MEMFD documentation.
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Merge tag 'kvm-x86-generic-6.10' of https://github.com/kvm-x86/linux into HEAD

KVM cleanups for 6.10:

 - Misc cleanups extracted from the "exit on missing userspace mapping" series,
   which has been put on hold in anticipation of a "KVM Userfault" approach,
   which should provide a superset of functionality.

 - Remove kvm_make_all_cpus_request_except(), which got added to hack around an
   AVIC bug, and then became dead code when a more robust fix came along.

 - Fix a goof in the KVM_CREATE_GUEST_MEMFD documentation.
This commit is contained in:
Paolo Bonzini 2024-05-12 03:16:47 -04:00
commit f4bc1373d5
3 changed files with 9 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/virt/kvm/api.rst
View File

@ -6316,7 +6316,7 @@ The "flags" field is reserved for future extensions and must be '0'.
:Architectures: none
:Type: vm ioctl
:Parameters: struct kvm_create_guest_memfd(in)
:Returns: 0 on success, <0 on error
:Returns: A file descriptor 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

2
include/linux/kvm_host.h
View File

@ -193,8 +193,6 @@ static inline bool is_error_page(struct page *page)
bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
unsigned long *vcpu_bitmap);
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);
bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except);
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1

27
virt/kvm/kvm_main.c
View File

@ -311,8 +311,7 @@ bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req,
return called;
}
bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
struct kvm_vcpu *except)
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
{
struct kvm_vcpu *vcpu;
struct cpumask *cpus;
@ -325,22 +324,14 @@ bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req,
cpus = this_cpu_cpumask_var_ptr(cpu_kick_mask);
cpumask_clear(cpus);
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu == except)
continue;
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_make_vcpu_request(vcpu, req, cpus, me);
}
called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT));
put_cpu();
return called;
}
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
{
return kvm_make_all_cpus_request_except(kvm, req, NULL);
}
EXPORT_SYMBOL_GPL(kvm_make_all_cpus_request);
void kvm_flush_remote_tlbs(struct kvm *kvm)
@ -2932,7 +2923,7 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
/*
* Pin guest page in memory and return its pfn.
* @addr: host virtual address which maps memory to the guest
* @atomic: whether this function can sleep
* @atomic: whether this function is forbidden from sleeping
* @interruptible: whether the process can be interrupted by non-fatal signals
* @async: whether this function need to wait IO complete if the
* host page is not in the memory
@ -3004,16 +2995,12 @@ kvm_pfn_t __gfn_to_pfn_memslot(const struct kvm_memory_slot *slot, gfn_t gfn,
if (hva)
*hva = addr;
if (addr == KVM_HVA_ERR_RO_BAD) {
if (writable)
*writable = false;
return KVM_PFN_ERR_RO_FAULT;
}
if (kvm_is_error_hva(addr)) {
if (writable)
*writable = false;
return KVM_PFN_NOSLOT;
return addr == KVM_HVA_ERR_RO_BAD ? KVM_PFN_ERR_RO_FAULT :
KVM_PFN_NOSLOT;
}
/* Do not map writable pfn in the readonly memslot. */
@ -3277,6 +3264,7 @@ static int next_segment(unsigned long len, int offset)
return len;
}
/* Copy @len bytes from guest memory at '(@gfn * PAGE_SIZE) + @offset' to @data */
static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
void *data, int offset, int len)
{
@ -3378,6 +3366,7 @@ int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
}
EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
/* Copy @len bytes from @data into guest memory at '(@gfn * PAGE_SIZE) + @offset' */
static int __kvm_write_guest_page(struct kvm *kvm,
struct kvm_memory_slot *memslot, gfn_t gfn,
const void *data, int offset, int len)