[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

> From: Boris Ostrovsky [mailto:boris.ostrovsky@xxxxxxxxxx]
> Sent: Saturday, June 20, 2015 2:45 AM
> 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 
> 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: Kevin Tian <kevin.tian@xxxxxxxxx>

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.