linux-kernel - [PATCH] KVM: Fix emulator mov cr decoding

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Date:	Mon, 20 Nov 2006 10:29:39 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	akpm@...l.org, kvm-devel@...ts.sourceforge.net,
	yaniv.kamay@...ranet.com, linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: Fix emulator mov cr decoding

From: Yaniv Kamay <yaniv@...ranet.com>

Decoding of the mov cr instructions was wrong.

Signed-off-by: Yaniv Kamay <yaniv@...ranet.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/x86_emulate.c
===================================================================
--- linux-2.6.orig/drivers/kvm/x86_emulate.c
+++ linux-2.6/drivers/kvm/x86_emulate.c
@@ -1268,13 +1268,13 @@ twobyte_special_insn:
 		b = insn_fetch(u8, 1, _eip);
 		if ((b & 0xc0) != 0xc0)
 			goto cannot_emulate;
-		_regs[(b >> 3) & 7] = realmode_get_cr(ctxt->vcpu, b & 7);
+		_regs[b & 7] = realmode_get_cr(ctxt->vcpu, (b >> 3) & 7);
 		break;
 	case 0x22: /* mov reg, cr */
 		b = insn_fetch(u8, 1, _eip);
 		if ((b & 0xc0) != 0xc0)
 			goto cannot_emulate;
-		realmode_set_cr(ctxt->vcpu, b & 7, _regs[(b >> 3) & 7] & -1u,
+		realmode_set_cr(ctxt->vcpu, (b >> 3) & 7, _regs[b & 7] & -1u,
 				&_eflags);
 		break;
 	case 0xc7:		/* Grp9 (cmpxchg8b) */
-
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