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KVM: x86: Do not clear RFLAGS.TF when a singlestep trap occurs. 

The trap flag stays set until software clears it.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Kyle Huey 2016-11-29 12:40:41 -08:00 committed by Paolo Bonzini
parent 6affcbedca
commit ea07e42dec
1 changed files with 0 additions and 1 deletions
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arch/x86/kvm/x86.c
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@ -5419,7 +5419,6 @@ static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, unsigned long rflag
kvm_run->exit_reason = KVM_EXIT_DEBUG;
*r = EMULATE_USER_EXIT;
} else {
vcpu->arch.emulate_ctxt.eflags &= ~X86_EFLAGS_TF;
/*
* "Certain debug exceptions may clear bit 0-3. The
* remaining contents of the DR6 register are never