Re: [RFT] Fix for unhandled msr c0000081 problems under Intel cpus

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Ingo Molnar wrote:
> * Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
>
>   
>>> actually, those MSRs are really architecture-defined for P6 family 
>>> CPUs. So KVM/qemu should at least fake something there, or ignore it. 
>>> These MSRs might be ticked by various existing kernels and 
>>> distributions. Performance counters are ignored at the moment?
>>>       
>> They are unimplemented, and tricky to implement.  Just swallowing the 
>> wrmsr is easy, but it won't do the expected thing, whatever that is.
>>     
>
> the expected thing is to get periodic watchdog NMIs injected - but it's 
> not a big problem if that doesnt work, the watchdog code detects that. 
> Crashing during bootup isnt too sexy though.
>   

I'll queue it for implementation then (it's just a variant of the timer 
interrupt).  Swallowing the wrmsr may be ok for Linux, but may cause 
other guests to fail unpredictably.


-- 
error compiling committee.c: too many arguments to function


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