Test instruction emulation should not perform writeback.
Signed-off-by: Nadav Amit <[email protected]>
---
arch/x86/kvm/emulate.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8b4cc5f..0ad0a75 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1708,6 +1708,8 @@ static int em_grp3(struct x86_emulate_ctxt *ctxt)
switch (ctxt->modrm_reg) {
case 0 ... 1: /* test */
emulate_2op_SrcV("test", ctxt->src, ctxt->dst, ctxt->eflags);
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
break;
case 2: /* not */
ctxt->dst.val = ~ctxt->dst.val;
@@ -2553,6 +2555,8 @@ static int em_cmp(struct x86_emulate_ctxt *ctxt)
static int em_test(struct x86_emulate_ctxt *ctxt)
{
emulate_2op_SrcV("test", ctxt->src, ctxt->dst, ctxt->eflags);
+ /* Disable writeback. */
+ ctxt->dst.type = OP_NONE;
return X86EMUL_CONTINUE;
}
--
1.7.4.1
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