[PATCH 4/5] KVM: x86 emulator: Use single stage decoding for PUSHA and POPA instructions

[Takuya Yoshikawa <takuya.yoshikawa@gmail.com>]

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

PUSHA and POPA are converted.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 arch/x86/kvm/emulate.c |   19 ++++++++++++-------
 1 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8295c50..4e16a55 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2224,6 +2224,11 @@ static int em_push_gs(struct x86_emulate_ctxt *ctxt)
 	return X86EMUL_CONTINUE;
 }
 
+static int em_pusha(struct x86_emulate_ctxt *ctxt)
+{
+	return emulate_pusha(ctxt, ctxt->ops);
+}
+
 static int em_pop(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -2256,6 +2261,11 @@ static int em_pop_gs(struct x86_emulate_ctxt *ctxt)
 	return emulate_pop_sreg(ctxt, ctxt->ops, VCPU_SREG_GS);
 }
 
+static int em_popa(struct x86_emulate_ctxt *ctxt)
+{
+	return emulate_popa(ctxt, ctxt->ops);
+}
+
 static int em_das(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -2567,7 +2577,8 @@ static struct opcode opcode_table[256] = {
 	/* 0x58 - 0x5F */
 	X8(I(DstReg | Stack, em_pop)),
 	/* 0x60 - 0x67 */
-	D(ImplicitOps | Stack | No64), D(ImplicitOps | Stack | No64),
+	I(ImplicitOps | Stack | No64, em_pusha),
+	I(ImplicitOps | Stack | No64, em_popa),
 	N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
 	N, N, N, N,
 	/* 0x68 - 0x6F */
@@ -3188,12 +3199,6 @@ special_insn:
 	case 0x48 ... 0x4f: /* dec r16/r32 */
 		emulate_1op("dec", c->dst, ctxt->eflags);
 		break;
-	case 0x60:	/* pusha */
-		rc = emulate_pusha(ctxt, ops);
-		break;
-	case 0x61:	/* popa */
-		rc = emulate_popa(ctxt, ops);
-		break;
 	case 0x63:		/* movsxd */
 		if (ctxt->mode != X86EMUL_MODE_PROT64)
 			goto cannot_emulate;
-- 
1.7.1