From: Avi Kivity Date: Wed, 30 Apr 2008 13:13:36 +0000 (+0300) Subject: KVM: x86 emulator: disable writeback on lmsw X-Git-Tag: v2.6.26-rc2~80^2~5 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=dc7457ea52f88539dc72925360e6068d5c938a0f;p=linux-2.6-omap-h63xx.git 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 --- 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);