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Groups > linux.kernel > #1532748
| From | Kyle Huey <me@kylehuey.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 5/5] KVM: x86: Do not clear RFLAGS.TF when a singlestep trap occurs. |
| Date | 2016-11-29 21:50 +0100 |
| Message-ID | <sIXvI-4Vd-11@gated-at.bofh.it> (permalink) |
| References | <sIXvH-4Vd-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
The trap flag stays set until software clears it.
Signed-off-by: Kyle Huey <khuey@kylehuey.com>
---
arch/x86/kvm/x86.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 7b38c5e..dd6b41e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5414,17 +5414,16 @@ static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, unsigned long rflag
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 |
DR6_RTM;
kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip;
kvm_run->debug.arch.exception = DB_VECTOR;
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
* cleared by the processor".
*/
vcpu->arch.dr6 &= ~15;
vcpu->arch.dr6 |= DR6_BS | DR6_RTM;
kvm_queue_exception(vcpu, DB_VECTOR);
--
2.10.2
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[PATCH v2 5/5] KVM: x86: Do not clear RFLAGS.TF when a singlestep trap occurs. Kyle Huey <me@kylehuey.com> - 2016-11-29 21:50 +0100
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