KVM: x86 emulator: implement 'and $imm, %{al|ax|eax}'

Implement emulation of instruction
    and al imm8 (opcode 0x24)
    and ax/eax imm16/imm32 (opcode 0x25)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index b4f439cfc66e..2b94d16e9d23 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -83,7 +83,7 @@ static u8 opcode_table[256] = {
         /* 0x20 - 0x27 */
         ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
         ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
-        0, 0, 0, 0,
+        SrcImmByte, SrcImm, 0, 0,
         /* 0x28 - 0x2F */
         ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
         ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
@@ -882,10 +882,27 @@ done_prefixes:
               sbb:              /* sbb */
                 emulate_2op_SrcV("sbb", src, dst, _eflags);
                 break;
-        case 0x20 ... 0x25:
+        case 0x20 ... 0x23:
               and:              /* and */
                 emulate_2op_SrcV("and", src, dst, _eflags);
                 break;
+        case 0x24:              /* and al imm8 */
+                dst.type = OP_REG;
+                dst.ptr = &_regs[VCPU_REGS_RAX];
+                dst.val = *(u8 *)dst.ptr;
+                dst.bytes = 1;
+                dst.orig_val = dst.val;
+                goto and;
+        case 0x25:              /* and ax imm16, or eax imm32 */
+                dst.type = OP_REG;
+                dst.bytes = op_bytes;
+                dst.ptr = &_regs[VCPU_REGS_RAX];
+                if (op_bytes == 2)
+                        dst.val = *(u16 *)dst.ptr;
+                else
+                        dst.val = *(u32 *)dst.ptr;
+                dst.orig_val = dst.val;
+                goto and;
         case 0x28 ... 0x2d:
               sub:              /* sub */
                 emulate_2op_SrcV("sub", src, dst, _eflags);