Re: [PATCH 0/3] powerpc: Instrument Hypervisor Calls

On Sun, Jul 16, 2006 at 08:53:21PM -0200, Luke Browning wrote:

quoted

Just so people don't forget: this can't be done on all processors. For
example, PPC970 and POWER4 don't implement the PURR SPR. And it doesn't
make sense to use H_PURR to get the software emulated ones there. Not
really an issue on POWER4 since they don't do shared processor LPAR, but
on JS21 I think they might do?

Isn't there someway to do a platform specific processor overlay, where you 
get PURR if it exists and TB otherwise.

Sure, it's what we have cpu feature bits for. It's not a difficult
problem to solve, I was just reminding of the lack of SPRN_PURR on some
processors that can run hypervisors.


-Olof