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| author | Nadav Amit <namit@cs.technion.ac.il> | 2014-07-17 01:19:31 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-07-21 13:43:09 +0200 |
| commit | 4161a569065b17954848069d5209182083ce876b (patch) | |
| tree | b9c283d8e7b6937cbbd7016a4431e8eca2407134 /arch/x86/kvm | |
| parent | 6c6cb69b8e974049cca2cc4480052fb9e7df767b (diff) | |
| download | linux-4161a569065b17954848069d5209182083ce876b.tar.bz2 | |
KVM: x86: emulator injects #DB when RFLAGS.RF is set
If the RFLAGS.RF is set, then no #DB should occur on instruction breakpoints.
However, the KVM emulator injects #DB regardless to RFLAGS.RF. This patch fixes
this behavior. KVM, however, still appears not to update RFLAGS.RF correctly,
regardless of this patch.
Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1fd806cb96d4..cc4f65f39b87 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5158,7 +5158,8 @@ static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) } } - if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK)) { + if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) && + !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) { dr6 = kvm_vcpu_check_hw_bp(eip, 0, vcpu->arch.dr7, vcpu->arch.db); |