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KVM: fix push of wrong eip when doing softint 

When doing a soft int, we need to bump eip before pushing it to
the stack.  Otherwise we'll do the int a second time.

[apw@canonical.com: merged eip update as per Jan's recommendation.]
Signed-off-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Serge E. Hallyn 2011-04-13 09:12:54 -05:00 committed by Avi Kivity
parent 4487b3b48d
commit 71f9833bb1
3 changed files with 13 additions and 6 deletions
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12
arch/x86/kvm/vmx.c
View File

@ -1063,7 +1063,10 @@ static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
}
if (vmx->rmode.vm86_active) {
if (kvm_inject_realmode_interrupt(vcpu, nr) != EMULATE_DONE)
int inc_eip = 0;
if (kvm_exception_is_soft(nr))
inc_eip = vcpu->arch.event_exit_inst_len;
if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
@ -2942,7 +2945,10 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu)
++vcpu->stat.irq_injections;
if (vmx->rmode.vm86_active) {
if (kvm_inject_realmode_interrupt(vcpu, irq) != EMULATE_DONE)
int inc_eip = 0;
if (vcpu->arch.interrupt.soft)
inc_eip = vcpu->arch.event_exit_inst_len;
if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE)
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
@ -2977,7 +2983,7 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
++vcpu->stat.nmi_injections;
vmx->nmi_known_unmasked = false;
if (vmx->rmode.vm86_active) {
if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR) != EMULATE_DONE)
if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}

5
arch/x86/kvm/x86.c
View File

@ -4423,7 +4423,7 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
}
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq)
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
{
struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
int ret;
@ -4432,7 +4432,8 @@ int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq)
vcpu->arch.emulate_ctxt.decode.op_bytes = 2;
vcpu->arch.emulate_ctxt.decode.ad_bytes = 2;
vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip;
vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip +
inc_eip;
ret = emulate_int_real(&vcpu->arch.emulate_ctxt, &emulate_ops, irq);
if (ret != X86EMUL_CONTINUE)

2
arch/x86/kvm/x86.h
View File

@ -77,7 +77,7 @@ static inline u32 bit(int bitno)
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq);
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data);