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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 /arch/x86/kvm/x86_emulate.c
parentde368dceb33c3c068dbde1407aff75cd8e126f04 (diff)
downloadblackbird-op-linux-dc7457ea52f88539dc72925360e6068d5c938a0f.tar.gz
blackbird-op-linux-dc7457ea52f88539dc72925360e6068d5c938a0f.zip
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>
Diffstat (limited to 'arch/x86/kvm/x86_emulate.c')
-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 2ca08386f993..f2a696d6a243 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);
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