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authorAvi Kivity <avi@qumranet.com>2008-04-30 16:13:36 +0300
committerAvi Kivity <avi@qumranet.com>2008-05-04 14:44:45 +0300
commitdc7457ea52f88539dc72925360e6068d5c938a0f (patch)
tree944de4de942d1e95d449b8a87ff47581f1720342
parentde368dceb33c3c068dbde1407aff75cd8e126f04 (diff)
KVM: x86 emulator: disable writeback on lmsw
The recent changes allowing memory operands with lmsw and smsw left lmsw with writeback enabled. Since lmsw has no oridinary destination operand, the dst pointer was not initialized, resulting in an oops. Close the hole by disabling writeback for lmsw. Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/x86_emulate.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 2ca08386f99..f2a696d6a24 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -1761,6 +1761,7 @@ twobyte_insn:
case 6: /* lmsw */
realmode_lmsw(ctxt->vcpu, (u16)c->src.val,
&ctxt->eflags);
+ c->dst.type = OP_NONE;
break;
case 7: /* invlpg*/
emulate_invlpg(ctxt->vcpu, memop);