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hv: instr_emul: add emulation for 0xf6 test instruction

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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 <jian.jun.chen@intel.com>
This commit is contained in:
Jian Jun Chen 2019-12-26 16:42:17 +08:00 committed by wenlingz
parent ee74737fd2
commit 5bf1f04ad7
1 changed files with 18 additions and 0 deletions
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18
hypervisor/arch/x86/guest/instr_emul.c
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@ -202,6 +202,10 @@ static const struct instr_emul_vie_op one_byte_opcodes[256] = {
[0x85] = { [0x85] = {
.op_type = VIE_OP_TYPE_TEST, .op_type = VIE_OP_TYPE_TEST,
}, },
[0xF6] = {
.op_type = VIE_OP_TYPE_TEST,
.op_flags = VIE_OP_F_BYTE_OP,
},
[0x08] = { [0x08] = {
.op_type = VIE_OP_TYPE_OR, .op_type = VIE_OP_TYPE_OR,
.op_flags = VIE_OP_F_BYTE_OP, .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; error = 0;
switch (vie->opcode) { 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: case 0x84U:
/* /*
* 84/r test r8, r/m8 * 84/r test r8, r/m8