[PATCH] KVM: x86 emulator: add JrCXZ instruction emulation

[Wei Yongjun <yjwei@cn.fujitsu.com>]

Add JrCXZ instruction emulation (opcode 0xe3)
Used by FreeBSD boot loader.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cbf6209..6ccc584 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2331,7 +2331,7 @@ static struct opcode opcode_table[256] = {
 	/* 0xD8 - 0xDF */
 	N, N, N, N, N, N, N, N,
 	/* 0xE0 - 0xE7 */
-	X3(D(SrcImmByte)), N,
+	X4(D(SrcImmByte)),
 	D(ByteOp | SrcImmUByte | DstAcc), D(SrcImmUByte | DstAcc),
 	D(ByteOp | SrcAcc | DstImmUByte), D(SrcAcc | DstImmUByte),
 	/* 0xE8 - 0xEF */
@@ -3092,6 +3092,10 @@ special_insn:
 		    (c->b == 0xe2 || test_cc(c->b ^ 0x5, ctxt->eflags)))
 			jmp_rel(c, c->src.val);
 		break;
+	case 0xe3:	/* jcxz/jecxz/jrcxz */
+		if (address_mask(c, c->regs[VCPU_REGS_RCX]) == 0)
+			jmp_rel(c, c->src.val);
+		break;
 	case 0xe4: 	/* inb */
 	case 0xe5: 	/* in */
 		goto do_io_in;
-- 
1.7.0.4