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KVM: VMX: Fix handling of a fault during NMI unblocked due to IRET

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Bit 12 is undefined in any of the following cases:
 If the VM exit sets the valid bit in the IDT-vectoring information field.
 If the VM exit is due to a double fault.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2009-03-30 16:03:08 +03:00 committed by Avi Kivity
parent 20c466b561
commit 7b4a25cb29
1 changed files with 11 additions and 6 deletions
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17
arch/x86/kvm/vmx.c
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@ -3272,36 +3272,41 @@ static void update_tpr_threshold(struct kvm_vcpu *vcpu)
static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
{
u32 exit_intr_info;
u32 idt_vectoring_info;
u32 idt_vectoring_info = vmx->idt_vectoring_info;
bool unblock_nmi;
u8 vector;
int type;
bool idtv_info_valid;
u32 error;
idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
if (cpu_has_virtual_nmis()) {
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
/*
* SDM 3: 25.7.1.2
* SDM 3: 27.7.1.2 (September 2008)
* Re-set bit "block by NMI" before VM entry if vmexit caused by
* a guest IRET fault.
* SDM 3: 23.2.2 (September 2008)
* Bit 12 is undefined in any of the following cases:
* If the VM exit sets the valid bit in the IDT-vectoring
* information field.
* If the VM exit is due to a double fault.
*/
if (unblock_nmi && vector != DF_VECTOR)
if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
vector != DF_VECTOR && !idtv_info_valid)
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
GUEST_INTR_STATE_NMI);
} else if (unlikely(vmx->soft_vnmi_blocked))
vmx->vnmi_blocked_time +=
ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
idt_vectoring_info = vmx->idt_vectoring_info;
idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
if (vmx->vcpu.arch.nmi_injected) {
/*
* SDM 3: 25.7.1.2
* SDM 3: 27.7.1.2 (September 2008)
* Clear bit "block by NMI" before VM entry if a NMI delivery
* faulted.
*/