On Tue, Apr 21, 2015 at 06:32:54PM +0200, Paolo Bonzini wrote:

> However, if you take into account that RDPMC can also be used
> to read an inactive counter, and that multiple guests "fight" for the
> same host counters, it's even harder to ensure that the guest counter
> indices match those on the host.

That doesn't make sense, only a single vcpu task will ever run at any
one time.

There cannot be inter guest counter contention.  Only the host can
compete for the same resources.
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