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: <20140307191050.GA10961@redhat.com>
Date:	Fri, 7 Mar 2014 14:10:50 -0500
From:	Dave Jones <davej@...hat.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	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 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.

	Dave


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