Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guestos statistics collection in guest os

[Jes Sorensen]

On 06/22/10 09:55, Peter Zijlstra wrote:
> On Tue, 2010-06-22 at 15:47 +0800, Zhang, Yanmin wrote:
>> Besides the para virt perf interface, I'm also considering the direct exposition
>> of PMU hardware to guest os. 
> 
> NAK NAK NAK NAK, we've been over that, its not going to happen, full
> stop!
> 
> Use MSR read/write traps and host perf to emulate the hardware. In some
> cases we could allow the reads without trap but that's a later
> optimization.

I believe whats meant here is a PMU compatible interface which is
partially emulated. Not a handover of the PMU.

Jes
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