linux-kernel - Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init

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Date:	Fri, 07 Mar 2014 10:56:11 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Andreas Herrmann <andreas.herrmann3@....com>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220
 init_amd()

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


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