Re: [Xen-devel] [PATCH v25 04/15] x86/VPMU: Interface for setting PMU mode and flags

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Am Freitag 19 Juni 2015, 14:44:35 schrieb Boris Ostrovsky:
> Add runtime interface for setting PMU mode and flags. Three main modes are
> provided:
> * XENPMU_MODE_OFF:  PMU is not virtualized
> * XENPMU_MODE_SELF: Guests can access PMU MSRs and receive PMU interrupts.
> * XENPMU_MODE_HV: Same as XENPMU_MODE_SELF for non-proviledged guests, dom0
>   can profile itself and the hypervisor.
> 
> Note that PMU modes are different from what can be provided at Xen's boot line
> with 'vpmu' argument. An 'off' (or '0') value is equivalent to 
> XENPMU_MODE_OFF.
> Any other value, on the other hand, will cause VPMU mode to be set to
> XENPMU_MODE_SELF during boot.
> 
> For feature flags only Intel's BTS is currently supported.
> 
> Mode and flags are set via HYPERVISOR_xenpmu_op hypercall.
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> 
> ---
> Changes in v25:
> * Added (vpmu_features == pmu_params.val) check in 
> do_xenpmu_op:XENPMU_mode_get

You mean in do_xenpmu_op:XENPMU_feature_set I think?

Reviewed-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>

Dietmar.


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