Re: [Xen-devel] [PATCH v19 05/14] x86/VPMU: Interface for setting PMU mode and flags

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.03.15 at 15:54, <boris.ostrovsky@xxxxxxxxxx> wrote:
> 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>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>


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