Re: High vm-exit latencies during kvm boot-up/shutdown

Avi Kivity
2007-10-26T08:20:32Z

Dong, Eddie wrote:
>> There's a two-liner required to make it work. I'll add it soon.
>>
>>
> But you still needs to issue WBINVD to all pCPUs which just move
> non-response time from one place to another, not?
>

You don't actually need to emulate wbinvd, you can just ignore it.

The only reason I can think of to use wbinvd is if you're taking a cpu
down (for a deep sleep state, or if you're shutting it off). A guest
need not do that.

Any other reason? dma? all dma today is cache-coherent, no?

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