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KVM: handle emulation failure case first

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If emulation failed return immediately.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-04-28 19:15:38 +03:00 committed by Avi Kivity
parent 8fe681e984
commit 3457e4192e
1 changed files with 15 additions and 16 deletions
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31
arch/x86/kvm/x86.c
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@ -3924,22 +3924,6 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
restart:
r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
if (r == 0)
kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
vcpu->arch.pio.count = 0;
return EMULATE_DO_MMIO;
}
if (vcpu->mmio_needed) {
if (vcpu->mmio_is_write)
vcpu->mmio_needed = 0;
return EMULATE_DO_MMIO;
}
if (r) { /* emulation failed */
/*
@ -3955,6 +3939,21 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
return EMULATE_FAIL;
}
shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
vcpu->arch.pio.count = 0;
return EMULATE_DO_MMIO;
}
if (vcpu->mmio_needed) {
if (vcpu->mmio_is_write)
vcpu->mmio_needed = 0;
return EMULATE_DO_MMIO;
}
if (vcpu->arch.exception.pending)
vcpu->arch.emulate_ctxt.restart = false;