Re: unhandled wrmsr

[Andre Przywara <andre.przywara@amd.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