Re: [Xen-devel] [PATCH v2 1/2] x86/VPMU: return correct fixed PMC count

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.11.15 at 20:32, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 11/25/2015 10:31 AM, Jan Beulich wrote:
>>> However, I just noticed that various control and status registers are
>>> not available for v1. I wonder whether we should even support version 1
>>> since we'd need to add whole lot of 'if (supported)' throughout the code
>>> plus there are some assumptions about existence of IA32_PERF_GLOBAL_CTRL
>>> so we'll need to add additional logic to handle that too. And it's not
>>> clear to me if it's all worth it.
>> Indeed, let's not support v1 then for now and leave the exercise
>> to add all the if()s to whoever cares for such support.
> 
> And, in fact, I think we should drop model check in core2_vpmu_init() 
> and only test for PMU version. Especially in light of XSA-163.
> 
> We could limit support to versions 2 and 3 only if we want to be on the 
> safe side.
> 
> If people agree I'll send a patch (on Monday).

Yes please.

Jan


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