Re: [Xen-devel] [PATCH for-xen-4.5] x86/pvh/vpmu: Disable VPMU for PVH guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.11.14 at 17:19, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 11/25/2014 09:55 AM, Jan Beulich wrote:
>>
>>> Regardless, do you think that disabling VPMU for PVH is worth anyway?
>> That depends on what (bad) consequences not doing so has.
> 
> I haven't seen anything (besides VAPIC accesses) but I think it would be 
> prudent to prevent any VPMU activity from happening. I can see, for 
> example MSRs and APIC vector being written. All of which look benign on 
> the first sight but who knows...

Yeah, it's not really a problem to put it in (if Konrad agrees; remember
that PVH is still experimental, and hence fixing bugs caused only by it
may be out of scope at this point - in any event I think that if your
patch is to go in, mine should too).

Jan


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