KVM: x86 emulator: add 8-bit memory operands

Useful for MOVSX/MOVZX.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 0982507b962a..5da6b3619201 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -57,6 +57,7 @@
 #define OpDS              23ull  /* DS */
 #define OpFS              24ull  /* FS */
 #define OpGS              25ull  /* GS */
+#define OpMem8            26ull  /* 8-bit zero extended memory operand */
 
 #define OpBits             5  /* Width of operand field */
 #define OpMask             ((1ull << OpBits) - 1)
@@ -101,6 +102,7 @@
 #define SrcAcc      (OpAcc << SrcShift)
 #define SrcImmU16   (OpImmU16 << SrcShift)
 #define SrcDX       (OpDX << SrcShift)
+#define SrcMem8     (OpMem8 << SrcShift)
 #define SrcMask     (OpMask << SrcShift)
 #define BitOp       (1<<11)
 #define MemAbs      (1<<12)      /* Memory operand is absolute displacement */
@@ -3656,6 +3658,9 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
         case OpImm:
                 rc = decode_imm(ctxt, op, imm_size(ctxt), true);
                 break;
+        case OpMem8:
+                ctxt->memop.bytes = 1;
+                goto mem_common;
         case OpMem16:
                 ctxt->memop.bytes = 2;
                 goto mem_common;