From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Dave Jones <davej@redhat.com>,
Fengguang Wu <fengguang.wu@intel.com>,
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 13:01:22 -0800 [thread overview]
Message-ID: <531A33A2.5030706@linux.intel.com> (raw)
In-Reply-To: <20140307191050.GA10961@redhat.com>
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
next prev parent reply other threads:[~2014-03-07 21:01 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
2014-03-07 19:10 ` Dave Jones
2014-03-07 21:01 ` H. Peter Anvin [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=531A33A2.5030706@linux.intel.com \
--to=hpa@linux.intel.com \
--cc=andreas.herrmann3@amd.com \
--cc=bp@alien8.de \
--cc=davej@redhat.com \
--cc=fengguang.wu@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=yhlu.kernel@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.