From: Wei Yongjun <yjwei@cn.fujitsu.com>
Date: Thu, 19 Aug 2010 06:25:48 +0000 (+0800)
Subject: KVM: x86 emulator: add JrCXZ instruction emulation
X-Git-Tag: v4.13~17119^2~174
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=e4abac67b756680c63af369f053d11991616aeb4;p=mirror_ubuntu-bionic-kernel.git

KVM: x86 emulator: add JrCXZ instruction emulation

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

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index aece501edce4..312e798d5425 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2487,7 +2487,7 @@ 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 */
@@ -3285,6 +3285,10 @@ 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;