hv: instr_emul: add emulation for 0xf6 test instruction

It is found that 0xf6 test instruction is used to access MMIO in Windows. This patch added emulation for 0xf6 test instruction. Tracked-On: #4310 Signed-off-by: Jian Jun Chen <[email protected]>
projectacrn · Dec 30, 2019 · 5bf1f04 · 5bf1f04
1 parent ee74737
commit 5bf1f04
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/hypervisor/arch/x86/guest/instr_emul.c b/hypervisor/arch/x86/guest/instr_emul.c
@@ -202,6 +202,10 @@ static const struct instr_emul_vie_op one_byte_opcodes[256] = {
 	[0x85] = {
 		.op_type = VIE_OP_TYPE_TEST,
 	},
+	[0xF6] = {
+		.op_type = VIE_OP_TYPE_TEST,
+		.op_flags = VIE_OP_F_BYTE_OP,
+	},
 	[0x08] = {
 		.op_type = VIE_OP_TYPE_OR,
 		.op_flags = VIE_OP_F_BYTE_OP,
@@ -1218,6 +1222,20 @@ static int32_t emulate_test(struct acrn_vcpu *vcpu, const struct instr_emul_vie
 	error = 0;
 
 	switch (vie->opcode) {
+	case 0xF6U:
+		/*
+		 * f6/0 ib	test r/m8, imm8
+		 */
+		size = 1U;
+		/* get the first operand */
+		vie_mmio_read(vcpu, &val1);
+
+		/*
+		 * perform the operation with the pre-fetched immediate
+		 * operand and write the result
+		 */
+		result = val1 & vie->immediate;
+		break;
 	case 0x84U:
 		/*
 		 * 84/r		test r8, r/m8