Re: [Xen-devel] [PATCH v2 2/6] xen/PMU: Sysfs interface for setting Xen PMU mode

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 06/11/2014 06:13 AM, Dietmar Hahn wrote:
> +
> +
> +/*
> + * PMU features:
> + * - XENPMU_FEATURE_INTEL_BTS: Intel BTS support (ignored on AMD)
> + */
> +#define XENPMU_FEATURE_INTEL_BTS  1
> Is this XENPMU_FEATURE_INTEL_BTS really needed on the the linux side?
> I would think it's a hypervisor internal feature.

Features are controlled (enabled/disabled) by dom0 via 
/sys/hypervisor/pmu/pmu_features so we need to have dom0 and the 
hypervisor agree on what the bits mean.
-boris

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