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KVM: x86: Polish exception injection via KVM_SET_GUEST_DEBUG 

Decouple KVM_GUESTDBG_INJECT_DB and KVM_GUESTDBG_INJECT_BP from
KVM_GUESTDBG_ENABLE, their are actually orthogonal. At this chance,
avoid triggering the WARN_ON in kvm_queue_exception if there is already
an exception pending and reject such invalid requests.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2009-10-30 12:46:59 +01:00 committed by Avi Kivity
parent e50212bb51
commit 4f926bf291
1 changed files with 14 additions and 6 deletions
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20
arch/x86/kvm/x86.c
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@ -4656,10 +4656,20 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg) struct kvm_guest_debug *dbg)
{ {
unsigned long rflags; unsigned long rflags;
int i; int i, r;
vcpu_load(vcpu); vcpu_load(vcpu);
if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
r = -EBUSY;
if (vcpu->arch.exception.pending)
goto unlock_out;
if (dbg->control & KVM_GUESTDBG_INJECT_DB)
kvm_queue_exception(vcpu, DB_VECTOR);
else
kvm_queue_exception(vcpu, BP_VECTOR);
}
/* /*
* Read rflags as long as potentially injected trace flags are still * Read rflags as long as potentially injected trace flags are still
* filtered out. * filtered out.
@ -4695,14 +4705,12 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
kvm_x86_ops->set_guest_debug(vcpu, dbg); kvm_x86_ops->set_guest_debug(vcpu, dbg);
if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_DB) r = 0;
kvm_queue_exception(vcpu, DB_VECTOR);
else if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_BP)
kvm_queue_exception(vcpu, BP_VECTOR);
unlock_out:
vcpu_put(vcpu); vcpu_put(vcpu);
return 0; return r;
} }
/* /*