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KVM: x86 emulator: do not inject exception directly into vcpu

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Return exception as a result of instruction emulation and handle
injection in KVM code.

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 19:15:44 +03:00
committed by Avi Kivity
parent 95cb229530
commit 54b8486f46
3 changed files with 100 additions and 50 deletions
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20
arch/x86/kvm/x86.c
View File

@ -3852,6 +3852,17 @@ static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
}
static void inject_emulated_exception(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
if (ctxt->exception == PF_VECTOR)
kvm_inject_page_fault(vcpu, ctxt->cr2, ctxt->error_code);
else if (ctxt->error_code_valid)
kvm_queue_exception_e(vcpu, ctxt->exception, ctxt->error_code);
else
kvm_queue_exception(vcpu, ctxt->exception);
}
int emulate_instruction(struct kvm_vcpu *vcpu,
unsigned long cr2,
u16 error_code,
@ -3886,6 +3897,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
memset(c, 0, sizeof(struct decode_cache));
memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
vcpu->arch.emulate_ctxt.interruptibility = 0;
vcpu->arch.emulate_ctxt.exception = -1;
r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
trace_kvm_emulate_insn_start(vcpu);
@ -3958,6 +3970,11 @@ restart:
memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
if (vcpu->arch.emulate_ctxt.exception >= 0) {
inject_emulated_exception(vcpu);
return EMULATE_DONE;
}
if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
vcpu->arch.pio.count = 0;
@ -3970,9 +3987,6 @@ restart:
return EMULATE_DO_MMIO;
}
if (vcpu->arch.exception.pending)
vcpu->arch.emulate_ctxt.restart = false;
if (vcpu->arch.emulate_ctxt.restart)
goto restart;