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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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4
arch/x86/kvm/svm.c
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@@ -1527,7 +1527,9 @@ static int pf_interception(struct vcpu_svm *svm)
trace_kvm_page_fault(fault_address, error_code);
if (!npt_enabled && kvm_event_needs_reinjection(&svm->vcpu))
kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
r = kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
svm->vmcb->control.insn_bytes,
svm->vmcb->control.insn_len);
break;
case KVM_PV_REASON_PAGE_NOT_PRESENT:
svm->apf_reason = 0;