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

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Message-ID: <531A33A2.5030706@linux.intel.com>
Date:	Fri, 07 Mar 2014 13:01:22 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Dave Jones <davej@...hat.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	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 03/07/2014 11:10 AM, Dave Jones wrote:
> On Fri, Mar 07, 2014 at 10:56:11AM -0800, H. Peter Anvin wrote:
>  > 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.
> 
> qemu64 triggers this ? That spew comes from amd_k7_smp_check() 
> which should only run on family 6, which was all 32bit.
> 

[    0.152749] smpboot: CPU0: AMD QEMU Virtual CPU version 1.6.0 (fam:
06, model: 02, stepping: 03)

Seems they are using a really odd CPUID combination, then.

	-hpa

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