From: Andre Przywara <andre.przywara@amd.com>
To: Dave Young <hidave.darkstar@gmail.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: unhandled wrmsr
Date: Wed, 2 Jun 2010 14:45:11 +0200 [thread overview]
Message-ID: <4C065257.5010809@amd.com> (raw)
In-Reply-To: <AANLkTikz5r3kDGdMQhQr6q8JhXrETTdYTcYbuDkw0EKF@mail.gmail.com>
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? 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
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.
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
>
>
> 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
next prev parent reply other threads:[~2010-06-02 12:48 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 [this message]
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
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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