From dc7457ea52f88539dc72925360e6068d5c938a0f Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 30 Apr 2008 16:13:36 +0300 Subject: [PATCH] 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 --- arch/x86/kvm/x86_emulate.c | 1 + 1 file changed, 1 insertion(+) 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);