From: Dave Young <hidave.darkstar@gmail.com>
To: Andre Przywara <andre.przywara@amd.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: unhandled wrmsr
Date: Thu, 3 Jun 2010 10:23:15 +0800 [thread overview]
Message-ID: <AANLkTinA-naETj6uDepdE5dF8gyPi4dWOTuGNwjMOKAx@mail.gmail.com> (raw)
In-Reply-To: <AANLkTikKmU5HsIX_PNx2scShnjGFTuG3Xw0YlLpqjNYn@mail.gmail.com>
On Thu, Jun 3, 2010 at 9:34 AM, Dave Young <hidave.darkstar@gmail.com> wrote:
> On Wed, Jun 2, 2010 at 8:45 PM, Andre Przywara <andre.przywara@amd.com> wrote:
>> Dave Young wrote:
>>>
>>> Hi,
>>>
>>> With today's git version (qemu-kvm), I got following message in kernel
>>> dmesg
>>>
>>> [168344.215605] kvm: 27289: cpu0 unhandled wrmsr: 0x198 data 0
>>
>> Are you sure about that?
>
> Sure
>
> 0x198 is an Intel architectural perfmon MSR and it
>> is read-only. The Linux kernel source I grep'ed obeys this and does only
>> rdmsr.
>> You can work around this by changing the error to a warning with:
>> # modprobe kvm ignore_msrs=1
>
> with this param, appear following warning:
> kvm: 28520: cpu0 ignored wrmsr: 0x198 data 0
>
>>
>> I'd like to see more details about the guest Linux kernel, at least the
>> version you used to see why there is a wrmsr on this address. Best is you
>> provide the kernel (just the vmlinuz file) somewhere so that we can
>> reproduce this. Also the qemu-kvm command line would be interesting.
>
> Actually I tried different guest image, recreate this problem is easy.
>
> one of them is slackware 13.0 kernel version 2.6.29.6, you can download from:
> http://www.slackware.at/data/slackware64-13.0/kernels/huge.s/
>
> kvm cmdline:
> qemu-system-x86_64 -net nic -net tap,ifname=tap0,script=no slack64.img
>
>>
>> Regards,
>> Andre.
>>
>>>
>>> bash-3.1$ /home/dave/tmp/qemu-system-x86_64 --version
>>> QEMU emulator version 0.12.50 (qemu-kvm-devel), Copyright (c)
>>> 2003-2008 Fabrice Bellard
Another problem with this build is I can not boot from virtio-blk, cmdline:
qemu-system-x86_64 -boot c -drive file=slack64.img,if-virtio,boot=on
qemu just complain about:
Could not read the boot disk
Anything missing by me?
>>>
>>>
>>> bash-3.1$ uname -a
>>> Linux darkstar 2.6.35-rc1 #35 SMP Mon May 31 16:50:15 CST 2010 x86_64
>>> Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz GenuineIntel GNU/Linux
>>>
>>> host distribution is slackware64-13.0
>>>
>>> 0.12.3 works well
>>>
>>> BTW the guest is a tiny core linux image
>>>
>>
>> --
>> Andre Przywara
>> AMD-Operating System Research Center (OSRC), Dresden, Germany
>> Tel: +49 351 448-3567-12
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe kvm" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
>
>
> --
> Regards
> dave
>
--
Regards
dave
next prev parent reply other threads:[~2010-06-03 2:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-02 8:44 unhandled wrmsr Dave Young
2010-06-02 12:45 ` Andre Przywara
2010-06-02 13:22 ` Peter Lieven
2014-12-04 9:58 ` Praveen
2010-06-03 1:34 ` Dave Young
2010-06-03 2:23 ` Dave Young [this message]
2010-06-03 2:24 ` Dave Young
2010-06-03 9:30 ` Andre Przywara
2010-06-03 9:52 ` Dave Young
2010-06-03 9:54 ` Dave Young
-- strict thread matches above, loose matches on Subject: below --
2010-11-01 19:13 Ross Boylan
2010-11-03 13:51 ` Marcelo Tosatti
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