From: Gleb Natapov <gleb@redhat.com>
Date: Sun, 21 Mar 2010 14:58:36 +0000 (+0200)
Subject: KVM: x86 emulator: fix unlocked CMPXCHG8B emulation
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=de3e6480f76804fe06d460ddb1920c7daa07f29b;p=linux-beck.git

KVM: x86 emulator: fix unlocked CMPXCHG8B emulation

When CMPXCHG8B is executed without LOCK prefix it is racy. Preserve this
behaviour in emulator too.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b8ce53861f68..64c9854f0458 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1724,7 +1724,6 @@ static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
 		       (u32) c->regs[VCPU_REGS_RBX];
 
 		ctxt->eflags |= EFLG_ZF;
-		c->lock_prefix = 1;
 	}
 	return X86EMUL_CONTINUE;
 }