Re: unhandled wrmsr

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On Mon, Nov 01, 2010 at 12:13:33PM -0700, Ross Boylan wrote:
> I built from qemu-kvm-0.13.0.tar.gz on a Debian system with kernel
> linux-image-2.6.32-5-amd64                2.6.32-26
> (but otherwise basically the stable/lenny version) and now see
> Oct 26 16:57:38 markov kernel: [ 5757.672426] kvm: 23063: cpu0 unhandled wrmsr: 0x198 data 0
> Oct 26 16:57:38 markov kernel: [ 5757.672454] kvm: 23063: cpu1 unhandled wrmsr: 0x198 data 0
> Oct 26 16:57:38 markov kernel: [ 5757.672476] kvm: 23063: cpu2 unhandled wrmsr: 0x198 data 0
> Oct 26 16:57:38 markov kernel: [ 5757.672497] kvm: 23063: cpu3 unhandled wrmsr: 0x198 data 0
> on startup.  I have 4 CPUs with 8 cores:
> Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz stepping 06.
> Note this means the kernel side is from the Debian package, and so might
> be older.
> 
> google shows this message has popped up several times in the past and
> been fixed several times.  Most of the messages indicate it is harmless,
> but https://bugs.launchpad.net/ubuntu/+source/linux/+bug/325851 on
> 2009-07-01 says it's "not benign".  There also seems to be a current bug
> open about it,
> http://sourceforge.net/tracker/index.php?func=detail&aid=3056363&group_id=180599&atid=893831, which is also marked as fixed.
> 
> Can anyone tell me anything more about these messages?  Do they indicate
> a problem I need to fix?  If so, any advice on how to fix it?

Its harmless. KVM included MSR_IA32_PERF_STATUS (0x198) in the msr
save/restore list, but there is no write emulation for it, which 
generates the warning.

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