This patchset exposes an emulated version 1 architectural performance
monitoring unit to KVM guests. The PMU is emulated using perf_events,
so the host kernel can multiplex host-wide, host-user, and the
guest on available resources.
Caveats:
- counters that have PMI (interrupt) enabled stop counting after the
interrupt is signalled. This is because we need one-shot samples
that keep counting, which perf doesn't support yet
- some combinations of INV and CMASK are not supported
- counters keep on counting in the host as well as the guest
perf maintainers: please consider the first three patches for merging (the
first two make sense even without the rest). If you're familiar with the Intel
PMU, please review patch 5 as well - it effectively undoes all your work
of abstracting the PMU into perf_events by unabstracting perf_events into what
is hoped is a very similar PMU.
v2:
- don't pass perf_event handler context to the callback; extract it via the
'event' parameter instead
- RDPMC emulation and interception
- CR4.PCE emulation
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
