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KVM: SVM: copy instruction bytes from VMCB

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In case of a nested page fault or an intercepted #PF newer SVM
implementations provide a copy of the faulting instruction bytes
in the VMCB.
Use these bytes to feed the instruction emulator and avoid the costly
guest instruction fetch in this case.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Andre Przywara
2010-12-21 11:12:07 +01:00
committed by Avi Kivity
parent df4f310856
commit dc25e89e07
8 changed files with 26 additions and 15 deletions
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5
arch/x86/kvm/mmu.c
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@@ -3330,7 +3330,8 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
}
}
int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code,
void *insn, int insn_len)
{
int r;
enum emulation_result er;
@@ -3348,7 +3349,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
if (r)
goto out;
er = x86_emulate_instruction(vcpu, cr2, 0);
er = x86_emulate_instruction(vcpu, cr2, 0, insn, insn_len);
switch (er) {
case EMULATE_DONE: