Re: unhandled wrmsr

[Praveen <Praveenmr008@gmail.com>]

Peter Lieven <pl <at> dlh.net> writes:

> 
> Andre Przywara 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? 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.
> 
> I see the same with Ubuntu 10.04 64-bit (2.6.32-21-server)
> 
> cmdline:
> /usr/bin/qemu-kvm-devel -net 
> tap,vlan=141,script=no,downscript=no,ifname=tap0 -net 
> nic,vlan=141,model=e1000,macaddr=52:54:00:ff:00:73   -drive
> 
> format=host_device,file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-
c0c61b105-db8000e7e954bf65-migration-test-
2,if=ide,boot=on,cache=none,aio=native
> 
> -m 1024 -cpu qemu64,model_id='Intel(R) Xeon(R) CPU           E5520   <at>  
> 2.27GHz',-kvmclock  -monitor tcp:0:4001,server,nowait -vnc :1 -name 
> 'migration-test-10-04'  -boot order=dc,menu=on  -k de  -pidfile 
> /var/run/qemu/vm-156.pid  -mem-path /hugepages -mem-prealloc  -rtc 
> base=utc,clock=host -usb -usbdevice tablet
> 
> >
> > 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   <at>  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
> >>
> >
> 
Hi i am also getting the same errors,

When i start he kvm, i was getting the error messages related to wrmsr, 
from a little bit of google i found out these are harmless and the 
workaround suggested was to make the errors to warning. but still i can see 
the warnings coming every time i started the kvm is there an actual fix to 
remove them. or just simply mask these errors. 

I am calling the kvm arguments from  inside a bash script so the redirecting 
the output is not working well. 
my host os is ubuntu 14-04. 

Thanks in Advance 
praveen