KVM: x86 emulator: Fix DstAcc decoding.

Set correct operation length. Add RAX (64bit) handling.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 2832a8c07c6a..0b70a364f0f4 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1194,9 +1194,9 @@ done_prefixes:
                 break;
         case DstAcc:
                 c->dst.type = OP_REG;
-                c->dst.bytes = c->op_bytes;
+                c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes;
                 c->dst.ptr = &c->regs[VCPU_REGS_RAX];
-                switch (c->op_bytes) {
+                switch (c->dst.bytes) {
                         case 1:
                                 c->dst.val = *(u8 *)c->dst.ptr;
                                 break;
@@ -1206,6 +1206,9 @@ done_prefixes:
                         case 4:
                                 c->dst.val = *(u32 *)c->dst.ptr;
                                 break;
+                        case 8:
+                                c->dst.val = *(u64 *)c->dst.ptr;
+                                break;
                 }
                 c->dst.orig_val = c->dst.val;
                 break;