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KVM: nVMX: consult PFEC_MASK and PFEC_MATCH when generating #PF VM-exit

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When generating #PF VM-exit, check equality:
(PFEC & PFEC_MASK) == PFEC_MATCH
If there is equality, the 14 bit of exception bitmap is used to take decision
about generating #PF VM-exit. If there is inequality, inverted 14 bit is used.

Signed-off-by: Eugene Korenevsky <ekorenevsky@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eugene Korenevsky 2014-12-16 22:35:53 +03:00 committed by Paolo Bonzini
parent e9ac033e6b
commit 19d5f10b3a
1 changed files with 13 additions and 2 deletions
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15
arch/x86/kvm/vmx.c
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@ -8206,6 +8206,18 @@ static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu)
vcpu->arch.walk_mmu = &vcpu->arch.mmu;
}
static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
u16 error_code)
{
bool inequality, bit;
bit = (vmcs12->exception_bitmap & (1u << PF_VECTOR)) != 0;
inequality =
(error_code & vmcs12->page_fault_error_code_mask) !=
vmcs12->page_fault_error_code_match;
return inequality ^ bit;
}
static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
@ -8213,8 +8225,7 @@ static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
WARN_ON(!is_guest_mode(vcpu));
/* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
if (vmcs12->exception_bitmap & (1u << PF_VECTOR))
if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code))
nested_vmx_vmexit(vcpu, to_vmx(vcpu)->exit_reason,
vmcs_read32(VM_EXIT_INTR_INFO),
vmcs_readl(EXIT_QUALIFICATION));