KVM: x86 emulator: centralize decoding of one-byte register access insns

Instructions like 'inc reg' that have the register operand encoded
in the opcode are currently specially decoded.  Extend
decode_register_operand() to handle that case, indicated by having
DstReg or SrcReg without ModRM.

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/kvm/x86_emulate.h b/drivers/kvm/x86_emulate.h
index f03b1287700a..e34868b42c33 100644
--- a/drivers/kvm/x86_emulate.h
+++ b/drivers/kvm/x86_emulate.h
@@ -126,6 +126,7 @@ struct decode_cache {
         u8 rep_prefix;
         u8 op_bytes;
         u8 ad_bytes;
+        u8 rex_prefix;
         struct operand src;
         struct operand dst;
         unsigned long *override_base;