diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2009-10-30 12:46:59 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-12-03 09:32:24 +0200 |
| commit | 4f926bf291863c237188bd2e27222ed801f12094 (patch) | |
| tree | f7cd491f8f05f0bc265271defc8be0b8012867be /arch/x86/kvm | |
| parent | e50212bb51356f0df48d6cce0aae5acf41df336d (diff) | |
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>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index cd6fe0a5797..ba8958dca3c 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4656,10 +4656,20 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) { unsigned long rflags; - int i; + int i, r; 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 * 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); - if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_DB) - kvm_queue_exception(vcpu, DB_VECTOR); - else if (vcpu->guest_debug & KVM_GUESTDBG_INJECT_BP) - kvm_queue_exception(vcpu, BP_VECTOR); + r = 0; +unlock_out: vcpu_put(vcpu); - return 0; + return r; } /* |