On 02/26/10 14:18, Ingo Molnar wrote:
* Avi Kivity<avi@xxxxxxxxxx> wrote:
Can you emulate the Core 2 pmu on, say, a P4? [...]
How about the Pentium? Or the i486?
As long as there's perf events support, the CPU can be supported in a soft
PMU. You can even cross-map exotic hw events if need to be - but most of the
tooling (in just about any OS) uses just a handful of core events ...
This is only possible if all future CPU perfmon events are guaranteed
to be a superset of previous versions. Otherwise you end up emulating
events and providing randomly generated numbers back.
The perfmon revision and size we present to a guest has to match the
current host.
Jes
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