From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Yinghai Lu <yhlu.kernel@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init_amd()
Date: Fri, 07 Mar 2014 10:56:11 -0800 [thread overview]
Message-ID: <531A164B.8040402@linux.intel.com> (raw)
In-Reply-To: <20140307055035.GA5230@localhost>
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
next prev parent reply other threads:[~2014-03-07 18:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 1:58 [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init_amd() Fengguang Wu
2014-03-07 5:03 ` H. Peter Anvin
2014-03-07 5:50 ` Fengguang Wu
2014-03-07 18:56 ` H. Peter Anvin [this message]
2014-03-07 19:10 ` Dave Jones
2014-03-07 21:01 ` H. Peter Anvin
2014-03-07 21:38 ` Borislav Petkov
2014-03-07 22:06 ` Dave Jones
2014-03-07 22:11 ` H. Peter Anvin
2014-03-07 22:22 ` Dave Jones
2014-03-07 22:27 ` Fengguang Wu
2014-03-07 22:34 ` Borislav Petkov
2014-03-07 22:20 ` Borislav Petkov
2014-03-07 22:27 ` Dave Jones
2014-03-07 22:39 ` Borislav Petkov
2014-03-09 18:07 ` Paolo Bonzini
2014-03-09 18:50 ` Borislav Petkov
2014-03-10 0:01 ` H. Peter Anvin
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