Re: [Xen-devel] [PATCH v6 18/29] xen/x86: allow disabling the emulated pmu

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.09.15 at 17:07, <roger.pau@xxxxxxxxxx> wrote:
> El 21/09/15 a les 16.48, Boris Ostrovsky ha escrit:
>> On 09/21/2015 10:36 AM, Jan Beulich wrote:
>>>>>> On 04.09.15 at 14:08, <roger.pau@xxxxxxxxxx> wrote:
>>> Hmm - this seems questionable to me: Isn't the vPMU an optional
>>> feature anyway? I.e. doesn't need separate handling here? Boris?
>> 
>> It is optional system-wise, not per-guest, which is what I think Roger
>> is trying to do. I in fact wanted to add ability to disable VPMU per
>> guest myself.
>> 
>> However, VPMU has nothing to do with device model so I don't think it
>> should be part of this series from that perspective.
> 
> vpmu is enabled globally on the xen command line, there's no way to
> disable it on a per-guest basis, so AFAICS it will be enabled for
> HMVlite guests which is wrong because we don't have a vlapic.

Hmm, Boris specifically enabled vPMU to be available to all three
kinds of guests, and PVH in it s current shape doesn't have a
vLAPIC either. So making such a connection seems wrong to me.

Jan


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