linux-kernel - [PATCH 3/7] KVM: x86: Clearing rflags.rf upon skipped emulated instruction

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Message-Id: <1405942650-22589-4-git-send-email-namit@cs.technion.ac.il>
Date:	Mon, 21 Jul 2014 14:37:26 +0300
From:	Nadav Amit <namit@...technion.ac.il>
To:	pbonzini@...hat.com
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, linux-kernel@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH 3/7] KVM: x86: Clearing rflags.rf upon skipped emulated instruction

When skipping an emulated instruction, rflags.rf should be cleared as it would
be on real x86 CPU.

Signed-off-by: Nadav Amit <namit@...technion.ac.il>
---
 arch/x86/kvm/x86.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c2aa58e..120ee83 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5264,6 +5264,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
 
 	if (emulation_type & EMULTYPE_SKIP) {
 		kvm_rip_write(vcpu, ctxt->_eip);
+		if (ctxt->eflags & X86_EFLAGS_RF)
+			kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
 		return EMULATE_DONE;
 	}
 
-- 
1.9.1

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