Re: [Xen-devel] [PATCH v12 for-xen-4.5 16/20] x86/VPMU: Handle PMU interrupts for PV guests

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

On 09/25/2014 03:28 PM, Boris Ostrovsky wrote:
> Add support for handling PMU interrupts for PV 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>
For the XSM parts:
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>

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