From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752689AbaCGS4X (ORCPT ); Fri, 7 Mar 2014 13:56:23 -0500 Received: from mga11.intel.com ([192.55.52.93]:31185 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751138AbaCGS4W (ORCPT ); Fri, 7 Mar 2014 13:56:22 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,609,1389772800"; d="scan'208";a="488097994" Message-ID: <531A164B.8040402@linux.intel.com> Date: Fri, 07 Mar 2014 10:56:11 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: Fengguang Wu CC: Andreas Herrmann , Ingo Molnar , Borislav Petkov , Yinghai Lu , LKML Subject: Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init_amd() References: <20140307015833.GA10048@localhost> <53195336.9080606@linux.intel.com> <20140307055035.GA5230@localhost> In-Reply-To: <20140307055035.GA5230@localhost> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/06/2014 09:50 PM, Fengguang Wu wrote: >> >> Unfortunately these things are hard to fix in Qemu. > > OK. As an alternative, is it possible to pass one of the below CPUID flags in > the Qemu command line, so as to quiet the warning? > I don't see the AMD SMP CPUID flag in there. Boris, could you help? The problem is that "qemu -cpu qemu64,+smep,+smap" identifies as an AMD CPU which triggers a warning/taint because the SMP flag isn't set. > > Recognized CPUID flags: > pbe ia64 tm ht ss sse2 sse fxsr mmx acpi ds clflush pn pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu > hypervisor rdrand f16c avx osxsave xsave aes tsc-deadline popcnt movbe x2apic sse4.2|sse4_2 sse4.1|sse4_1 dca pcid pdcm xtpr cx16 fma cid ssse3 tm2 est smx vmx ds_cpl monitor dtes64 pclmulqdq|pclmuldq pni|sse3 > smap adx rdseed rtm invpcid erms bmi2 smep avx2 hle bmi1 fsgsbase > 3dnow 3dnowext lm|i64 rdtscp pdpe1gb fxsr_opt|ffxsr mmxext nx|xd syscall > perfctr_nb perfctr_core topoext tbm nodeid_msr tce fma4 lwp wdt skinit xop ibs osvw 3dnowprefetch misalignsse sse4a abm cr8legacy extapic svm cmp_legacy lahf_lm > pmm-en pmm phe-en phe ace2-en ace2 xcrypt-en xcrypt xstore-en xstore > kvm_pv_eoi kvm_steal_time kvm_asyncpf kvmclock kvm_mmu kvm_nopiodelay kvmclock > pfthreshold pause_filter decodeassists flushbyasid vmcb_clean tsc_scale nrip_save svm_lock lbrv npt > -hpa