Re: [PATCH] Remove MSR_P6_{EVNTSEL0,PERFCTR0} from printk warning list.

[Jes Sorensen <Jes.Sorensen@redhat.com>]

On 07/01/10 16:38, Avi Kivity wrote:
> On 06/30/2010 05:27 PM, Jes.Sorensen@redhat.com wrote:
>> From: Jes Sorensen<Jes.Sorensen@redhat.com>
>>
>> MSR_P6_EVNTSEL0 and MSR_P6_PERFCTR0 are used to probe for the P6 PMU
>> for older family 6 CPUs, which is also the default in QEMU. Ie. per
>> default we get the noise of these warnings in dmesg, confusing users
>> for no reason.
> 
> For the reason, see the comment above.  The guest may be trying to do
> something with the counters and expect them to work.  Without the
> warning we'd have no idea we are knowningly misemulating something.

Saw it, which is why I only suggest we remove EVNTSEL0 and PERFCTR0 but
not the others. If the guest is expecting normal operation it is likely
to use more than just the first.

People are reporting these triggering in dmesg for both Linux and
Windows guests btw.

We could put them so the two in question only trigger with a debug flag
or something like that?

Cheers,
Jes