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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>
This commit is contained in:
Nadav Amit 2014-07-17 01:19:31 +03:00 committed by Paolo Bonzini
parent 6c6cb69b8e
commit 4161a56906
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/x86.c
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@ -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);