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Re: [Xen-devel] [PATCH] x86/vpmu: Add get/put_vpmu() and VPMU_ENABLED

>>> On 16.02.17 at 18:31, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 02/16/2017 11:59 AM, Jan Beulich wrote:
>> Also this new model basically limits the opportunity to change the
>> mode to the case where no guest at all is running, iiuc. Previously
>> this would have been possible with any number of guests running,
>> as long as none of them actually used the vPMU.
> I don't think much changed. The only difference is that for PV guests we 
> bump vpmu_count at VCPU creation as opposed to during the hypercall.
> And HVM guests always incremented the count during vcpu_initialise().

True, so my earlier statement needs to be limited to PV guests.


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