KVM: x86 emulator: convert some push instructions to direct decode

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7e9bcda..904fc1c 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2016,6 +2016,12 @@ static void string_addr_inc(struct x86_emulate_ctxt *ctxt, unsigned long base,
        op->ptr = (unsigned long *)register_address(c,  base, c->regs[reg]);
 }
 
+static int em_push(struct x86_emulate_ctxt *ctxt)
+{
+       emulate_push(ctxt, ctxt->ops);
+       return X86EMUL_CONTINUE;
+}
+
 #define D(_y) { .flags = (_y) }
 #define N    D(0)
 #define G(_f, _g) { .flags = ((_f) | Group), .u.group = (_g) }
@@ -2111,7 +2117,7 @@ static struct opcode opcode_table[256] = {
        /* 0x40 - 0x4F */
        X16(D(DstReg)),
        /* 0x50 - 0x57 */
-       X8(D(SrcReg | Stack)),
+       X8(I(SrcReg | Stack, em_push)),
        /* 0x58 - 0x5F */
        X8(D(DstReg | Stack)),
        /* 0x60 - 0x67 */
@@ -2119,7 +2125,8 @@ static struct opcode opcode_table[256] = {
        N, D(DstReg | SrcMem32 | ModRM | Mov) /* movsxd (x86/64) */ ,
        N, N, N, N,
        /* 0x68 - 0x6F */
-       D(SrcImm | Mov | Stack), N, D(SrcImmByte | Mov | Stack), N,
+       I(SrcImm | Mov | Stack, em_push), N,
+       I(SrcImmByte | Mov | Stack, em_push), N,
        D(DstDI | ByteOp | Mov | String), D(DstDI | Mov | String), /* insb, insw/insd */
        D(SrcSI | ByteOp | ImplicitOps | String), D(SrcSI | ImplicitOps | String), /* outsb, outsw/outsd */
        /* 0x70 - 0x7F */
@@ -2786,9 +2793,6 @@ special_insn:
        case 0x48 ... 0x4f: /* dec r16/r32 */
                emulate_1op("dec", c->dst, ctxt->eflags);
                break;
-       case 0x50 ... 0x57:  /* push reg */
-               emulate_push(ctxt, ops);
-               break;
        case 0x58 ... 0x5f: /* pop reg */
        pop_instruction:
                rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
@@ -2810,10 +2814,6 @@ special_insn:
                        goto cannot_emulate;
                c->dst.val = (s32) c->src.val;
                break;
-       case 0x68: /* push imm */
-       case 0x6a: /* push imm8 */
-               emulate_push(ctxt, ops);
-               break;
        case 0x6c:              /* insb */
        case 0x6d:              /* insw/insd */
                c->dst.bytes = min(c->dst.bytes, 4u);