Re: [Xen-devel] [PATCH v25 12/15] x86/VPMU: Handle PMU interrupts for PV(H) guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.06.15 at 20:44, <boris.ostrovsky@xxxxxxxxxx> wrote:
> Add support for handling PMU interrupts for PV(H) guests.
> 
> VPMU for the interrupted VCPU is unloaded until the guest issues 
> XENPMU_flush
> hypercall. This allows the guest to access PMU MSR values that are stored in
> VPMU context which is shared between hypervisor and domain, thus avoiding
> traps to hypervisor.
> 
> Since the interrupt handler may now force VPMU context save (i.e. set
> VPMU_CONTEXT_SAVE flag) we need to make changes to amd_vpmu_save() which
> until now expected this flag to be set only when the counters were stopped.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>


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