On Mon, Mar 01, 2010 at 06:17:40PM +0100, Peter Zijlstra wrote: > On Mon, 2010-03-01 at 12:11 +0100, Joerg Roedel wrote: > > > > 1. Enhance perf to count pmu events only when cpu is in guest mode. > > No enhancements needed, only hardware support for Intel doesn't provide > this iirc. At least the guest-bit for AMD perfctl registers is not supported yet ;-) Implementing this eliminates the requirement to write the perfctl msrs on every vmrun and every vmexit. But thats a minor change. > > 4. Some additional magic to reinject pmu events into the guest > > Right, that is needed, and might be 'interesting' since we get them from > NMI context. I imagine some kind of callback which sets a flag in the kvm vcpu structure. Since the NMI already triggered a vmexit the kvm code checks for this bit on its path to re-entry. Joerg -- 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
