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Commit 75f72845 authored by Avi Kivity's avatar Avi Kivity Committed by Marcelo Tosatti
Browse files

KVM: x86 emulator: mark CMP, CMPS, SCAS, TEST as NoWrite 



Acked-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi.kivity@gmail.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent b6744dc3

arch/x86/kvm/emulate.c

+8 −12
Original line number Diff line number Diff line
@@ -3069,16 +3069,12 @@ static int em_xor(struct x86_emulate_ctxt *ctxt) 
static int em_cmp(struct x86_emulate_ctxt *ctxt)

{

	emulate_2op_SrcV(ctxt, "cmp");

	/* Disable writeback. */

	ctxt->dst.type = OP_NONE;

	return X86EMUL_CONTINUE;

}



static int em_test(struct x86_emulate_ctxt *ctxt)

{

	emulate_2op_SrcV(ctxt, "test");

	/* Disable writeback. */

	ctxt->dst.type = OP_NONE;

	return X86EMUL_CONTINUE;

}
@@ -3747,7 +3743,7 @@ static const struct opcode group1[] = { 
	I(Lock | PageTable, em_and),

	I(Lock, em_sub),

	I(Lock, em_xor),

	I(0, em_cmp),

	I(NoWrite, em_cmp),

};



static const struct opcode group1A[] = {
@@ -3755,8 +3751,8 @@ static const struct opcode group1A[] = { 
};



static const struct opcode group3[] = {

	I(DstMem | SrcImm, em_test),

	I(DstMem | SrcImm, em_test),

	I(DstMem | SrcImm | NoWrite, em_test),

	I(DstMem | SrcImm | NoWrite, em_test),

	I(DstMem | SrcNone | Lock, em_not),

	I(DstMem | SrcNone | Lock, em_neg),

	I(SrcMem, em_mul_ex),
@@ -3920,7 +3916,7 @@ static const struct opcode opcode_table[256] = { 
	/* 0x30 - 0x37 */

	I6ALU(Lock, em_xor), N, N,

	/* 0x38 - 0x3F */

	I6ALU(0, em_cmp), N, N,

	I6ALU(NoWrite, em_cmp), N, N,

	/* 0x40 - 0x4F */

	X16(D(DstReg)),

	/* 0x50 - 0x57 */
@@ -3946,7 +3942,7 @@ static const struct opcode opcode_table[256] = { 
	G(DstMem | SrcImm, group1),

	G(ByteOp | DstMem | SrcImm | No64, group1),

	G(DstMem | SrcImmByte, group1),

	I2bv(DstMem | SrcReg | ModRM, em_test),

	I2bv(DstMem | SrcReg | ModRM | NoWrite, em_test),

	I2bv(DstMem | SrcReg | ModRM | Lock | PageTable, em_xchg),

	/* 0x88 - 0x8F */

	I2bv(DstMem | SrcReg | ModRM | Mov | PageTable, em_mov),
@@ -3966,12 +3962,12 @@ static const struct opcode opcode_table[256] = { 
	I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),

	I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),

	I2bv(SrcSI | DstDI | Mov | String, em_mov),

	I2bv(SrcSI | DstDI | String, em_cmp),

	I2bv(SrcSI | DstDI | String | NoWrite, em_cmp),

	/* 0xA8 - 0xAF */

	I2bv(DstAcc | SrcImm, em_test),

	I2bv(DstAcc | SrcImm | NoWrite, em_test),

	I2bv(SrcAcc | DstDI | Mov | String, em_mov),

	I2bv(SrcSI | DstAcc | Mov | String, em_mov),

	I2bv(SrcAcc | DstDI | String, em_cmp),

	I2bv(SrcAcc | DstDI | String | NoWrite, em_cmp),

	/* 0xB0 - 0xB7 */

	X8(I(ByteOp | DstReg | SrcImm | Mov, em_mov)),

	/* 0xB8 - 0xBF */