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KVM: X86: Propagate fetch faults

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KVM currently ignores fetch faults in the instruction
emulator. With nested-npt we could have such faults. This
patch adds the code to handle these.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2010-09-10 17:30:56 +02:00 committed by Avi Kivity
parent d4f8cf664e
commit d47f00a62b
2 changed files with 7 additions and 0 deletions
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3
arch/x86/kvm/emulate.c
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@ -1198,6 +1198,9 @@ static int emulate_popf(struct x86_emulate_ctxt *ctxt,
*(unsigned long *)dest =
(ctxt->eflags & ~change_mask) | (val & change_mask);
if (rc == X86EMUL_PROPAGATE_FAULT)
emulate_pf(ctxt);
return rc;
}

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

@ -4247,6 +4247,9 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
vcpu->arch.emulate_ctxt.perm_ok = false;
r = x86_decode_insn(&vcpu->arch.emulate_ctxt);
if (r == X86EMUL_PROPAGATE_FAULT)
goto done;
trace_kvm_emulate_insn_start(vcpu);
/* Only allow emulation of specific instructions on #UD
@ -4305,6 +4308,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
return handle_emulation_failure(vcpu);
}
done:
if (vcpu->arch.emulate_ctxt.exception >= 0) {
inject_emulated_exception(vcpu);
r = EMULATE_DONE;