[PATCH 5/5] KVM: x86 emulator: Use single stage decoding for PUSHF and POPF instructions

[Takuya Yoshikawa <takuya.yoshikawa@xxxxxxxxx>]

From: Takuya Yoshikawa <yoshikawa.takuya@xxxxxxxxxxxxx>

PUSHF and POPF are converted.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@xxxxxxxxxxxxx>
---
 arch/x86/kvm/emulate.c |   32 +++++++++++++++++++++-----------
 1 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 4e16a55..60182d3 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2229,6 +2229,15 @@ static int em_pusha(struct x86_emulate_ctxt *ctxt)
 	return emulate_pusha(ctxt, ctxt->ops);
 }
 
+static int em_pushf(struct x86_emulate_ctxt *ctxt)
+{
+	struct decode_cache *c = &ctxt->decode;
+
+	c->src.val =  (unsigned long)ctxt->eflags;
+	emulate_push(ctxt, ctxt->ops);
+	return X86EMUL_CONTINUE;
+}
+
 static int em_pop(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -2266,6 +2275,16 @@ static int em_popa(struct x86_emulate_ctxt *ctxt)
 	return emulate_popa(ctxt, ctxt->ops);
 }
 
+static int em_popf(struct x86_emulate_ctxt *ctxt)
+{
+	struct decode_cache *c = &ctxt->decode;
+
+	c->dst.type = OP_REG;
+	c->dst.addr.reg = &ctxt->eflags;
+	c->dst.bytes = c->op_bytes;
+	return emulate_popf(ctxt, ctxt->ops, &c->dst.val, c->op_bytes);
+}
+
 static int em_das(struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -2606,7 +2625,8 @@ static struct opcode opcode_table[256] = {
 	/* 0x98 - 0x9F */
 	D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),
 	I(SrcImmFAddr | No64, em_call_far), N,
-	D(ImplicitOps | Stack), D(ImplicitOps | Stack), N, N,
+	I(ImplicitOps | Stack, em_pushf),
+	I(ImplicitOps | Stack, em_popf), N, N,
 	/* 0xA0 - 0xA7 */
 	I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),
 	I2bv(DstMem | SrcAcc | Mov | MemAbs, em_mov),
@@ -3276,16 +3296,6 @@ special_insn:
 		case 8: c->dst.val = (s32)c->dst.val; break;
 		}
 		break;
-	case 0x9c: /* pushf */
-		c->src.val =  (unsigned long) ctxt->eflags;
-		emulate_push(ctxt, ops);
-		break;
-	case 0x9d: /* popf */
-		c->dst.type = OP_REG;
-		c->dst.addr.reg = &ctxt->eflags;
-		c->dst.bytes = c->op_bytes;
-		rc = emulate_popf(ctxt, ops, &c->dst.val, c->op_bytes);
-		break;
 	case 0xa6 ... 0xa7:	/* cmps */
 		c->dst.type = OP_NONE; /* Disable writeback. */
 		emulate_2op_SrcV("cmp", c->src, c->dst, ctxt->eflags);
-- 
1.7.1

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