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KVM fixes for v4.13-rc2

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A bunch of small fixes for x86.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fixes from Radim Krčmář:
 "A bunch of small fixes for x86"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  kvm: x86: hyperv: avoid livelock in oneshot SynIC timers
  KVM: VMX: Fix invalid guest state detection after task-switch emulation
  x86: add MULTIUSER dependency for KVM
  KVM: nVMX: Disallow VM-entry in MOV-SS shadow
  KVM: nVMX: track NMI blocking state separately for each VMCS
  KVM: x86: masking out upper bits
This commit is contained in:
Linus Torvalds 2017-07-21 13:58:10 -07:00
commit b0a752818b
4 changed files with 38 additions and 21 deletions
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2
arch/x86/kvm/Kconfig
View File

@ -22,7 +22,7 @@ config KVM
depends on HAVE_KVM
depends on HIGH_RES_TIMERS
# for TASKSTATS/TASK_DELAY_ACCT:
depends on NET
depends on NET && MULTIUSER
select PREEMPT_NOTIFIERS
select MMU_NOTIFIER
select ANON_INODES

7
arch/x86/kvm/hyperv.c
View File

@ -649,9 +649,10 @@ void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
}
if ((stimer->config & HV_STIMER_ENABLE) &&
stimer->count)
stimer_start(stimer);
else
stimer->count) {
if (!stimer->msg_pending)
stimer_start(stimer);
} else
stimer_cleanup(stimer);
}
}

46
arch/x86/kvm/vmx.c
View File

@ -198,7 +198,8 @@ struct loaded_vmcs {
struct vmcs *vmcs;
struct vmcs *shadow_vmcs;
int cpu;
int launched;
bool launched;
bool nmi_known_unmasked;
struct list_head loaded_vmcss_on_cpu_link;
};
@ -2326,6 +2327,11 @@ static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
__vmx_load_host_state(to_vmx(vcpu));
}
static bool emulation_required(struct kvm_vcpu *vcpu)
{
return emulate_invalid_guest_state && !guest_state_valid(vcpu);
}
static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
/*
@ -2363,6 +2369,8 @@ static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
unsigned long old_rflags = vmx_get_rflags(vcpu);
__set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
to_vmx(vcpu)->rflags = rflags;
if (to_vmx(vcpu)->rmode.vm86_active) {
@ -2370,6 +2378,9 @@ static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
}
vmcs_writel(GUEST_RFLAGS, rflags);
if ((old_rflags ^ to_vmx(vcpu)->rflags) & X86_EFLAGS_VM)
to_vmx(vcpu)->emulation_required = emulation_required(vcpu);
}
static u32 vmx_get_pkru(struct kvm_vcpu *vcpu)
@ -3857,11 +3868,6 @@ static __init int alloc_kvm_area(void)
return 0;
}
static bool emulation_required(struct kvm_vcpu *vcpu)
{
return emulate_invalid_guest_state && !guest_state_valid(vcpu);
}
static void fix_pmode_seg(struct kvm_vcpu *vcpu, int seg,
struct kvm_segment *save)
{
@ -5510,10 +5516,8 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (!is_guest_mode(vcpu)) {
++vcpu->stat.nmi_injections;
vmx->nmi_known_unmasked = false;
}
++vcpu->stat.nmi_injections;
vmx->loaded_vmcs->nmi_known_unmasked = false;
if (vmx->rmode.vm86_active) {
if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
@ -5527,16 +5531,21 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
{
if (to_vmx(vcpu)->nmi_known_unmasked)
struct vcpu_vmx *vmx = to_vmx(vcpu);
bool masked;
if (vmx->loaded_vmcs->nmi_known_unmasked)
return false;
return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
masked = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
vmx->loaded_vmcs->nmi_known_unmasked = !masked;
return masked;
}
static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
vmx->nmi_known_unmasked = !masked;
vmx->loaded_vmcs->nmi_known_unmasked = !masked;
if (masked)
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
GUEST_INTR_STATE_NMI);
@ -8736,7 +8745,7 @@ static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
if (vmx->nmi_known_unmasked)
if (vmx->loaded_vmcs->nmi_known_unmasked)
return;
/*
* Can't use vmx->exit_intr_info since we're not sure what
@ -8760,7 +8769,7 @@ static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
GUEST_INTR_STATE_NMI);
else
vmx->nmi_known_unmasked =
vmx->loaded_vmcs->nmi_known_unmasked =
!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO)
& GUEST_INTR_STATE_NMI);
}
@ -10488,6 +10497,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu);
u32 exit_qual;
int ret;
@ -10512,6 +10522,12 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* for misconfigurations which will anyway be caught by the processor
* when using the merged vmcs02.
*/
if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS) {
nested_vmx_failValid(vcpu,
VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
goto out;
}
if (vmcs12->launch_state == launch) {
nested_vmx_failValid(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS

4
arch/x86/kvm/x86.c
View File

@ -597,8 +597,8 @@ bool pdptrs_changed(struct kvm_vcpu *vcpu)
(unsigned long *)&vcpu->arch.regs_avail))
return true;
gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
gfn = (kvm_read_cr3(vcpu) & ~31ul) >> PAGE_SHIFT;
offset = (kvm_read_cr3(vcpu) & ~31ul) & (PAGE_SIZE - 1);
r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
PFERR_USER_MASK | PFERR_WRITE_MASK);
if (r < 0)