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authorGleb Natapov <gleb@redhat.com>2013-04-24 13:38:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-07 19:51:57 -0700
commit5b5b30580218eae22609989546bac6e44d0eda6e (patch)
tree5763a61f5cbcacb3922eb1588d4458a8f7013b0e
parentbb878b3019cb0b1d574bd88e30ce00ea6d6814f9 (diff)
downloadvexpress-lsk-5b5b30580218eae22609989546bac6e44d0eda6e.tar.gz
KVM: X86 emulator: fix source operand decoding for 8bit mov[zs]x instructions
commit 660696d1d16a71e15549ce1bf74953be1592bcd3 upstream. Source operand for one byte mov[zs]x is decoded incorrectly if it is in high byte register. Fix that. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kvm/emulate.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 83756223f8a..8c45818c732 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3737,6 +3737,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
break;
case OpMem8:
ctxt->memop.bytes = 1;
+ if (ctxt->memop.type == OP_REG) {
+ ctxt->memop.addr.reg = decode_register(ctxt, ctxt->modrm_rm, 1);
+ fetch_register_operand(&ctxt->memop);
+ }
goto mem_common;
case OpMem16:
ctxt->memop.bytes = 2;