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KVM: x86: Do not return soft events in vcpu_events 

To avoid that user space migrates a pending software exception or
interrupt, mask them out on KVM_GET_VCPU_EVENTS. Without this, user
space would try to reinject them, and we would have to reconstruct the
proper instruction length for VMX event injection. Now the pending event
will be reinjected via executing the triggering instruction again.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2010-02-15 10:45:41 +01:00 committed by Avi Kivity
parent 8fe546547c
commit 03b82a30ea
1 changed files with 6 additions and 3 deletions
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9
arch/x86/kvm/x86.c
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@ -2100,14 +2100,17 @@ static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
{
vcpu_load(vcpu);
events->exception.injected = vcpu->arch.exception.pending;
events->exception.injected =
vcpu->arch.exception.pending &&
!kvm_exception_is_soft(vcpu->arch.exception.nr);
events->exception.nr = vcpu->arch.exception.nr;
events->exception.has_error_code = vcpu->arch.exception.has_error_code;
events->exception.error_code = vcpu->arch.exception.error_code;
events->interrupt.injected = vcpu->arch.interrupt.pending;
events->interrupt.injected =
vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
events->interrupt.nr = vcpu->arch.interrupt.nr;
events->interrupt.soft = vcpu->arch.interrupt.soft;
events->interrupt.soft = 0;
events->nmi.injected = vcpu->arch.nmi_injected;
events->nmi.pending = vcpu->arch.nmi_pending;