linux-kernel - [PATCH] KVM: Fix MOVSX emulation

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Date:	Sat, 14 Jan 2012 20:34:08 +0200
From:	Nadav Amit <namit@...technion.ac.il>
To:	Avi Kivity <avi@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>,
	Nadav Amit <nadav.amit@...il.com>
Subject: [PATCH] KVM: Fix MOVSX emulation

The destination register of MOVSX should be decoded similarily to MOVZX.

Signed-off-by: Nadav Amit <nadav.amit@...il.com>
---
 arch/x86/kvm/emulate.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 05a562b..7644a83 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3553,7 +3553,8 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
 	case OpReg:
 		decode_register_operand(ctxt, op,
 			 op == &ctxt->dst &&
-			 ctxt->twobyte && (ctxt->b == 0xb6 || ctxt->b == 0xb7));
+			 ctxt->twobyte && ((ctxt->b & 0xfe) == 0xb6 ||
+				(ctxt->b & 0xfe) == 0xbe));
 		break;
 	case OpImmUByte:
 		rc = decode_imm(ctxt, op, 1, false);
-- 
1.7.4.1

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