Thiago Jung Bauermann <bauer...@linux.vnet.ibm.com> writes: > Hello, > > The hypervisor interface to access 24x7 performance counters (which collect > performance information from system power on to system power off) has been > extended in POWER9 adding new fields to the request and result element > structures. > > Also, results for some domains now return more than one result element and > those need to be added to get a total count. > > The first two patches fix bugs in the existing code. The following 4 > patches are code improvements and the last two finally implement support > for the changes in POWER9 described above. > > POWER8 systems only support version 1 of the interface, while POWER9 > systems only support version 2. I tested these patches on POWER8 to verify > that there are no regressions, and also on POWER9 DD1.
Where is version 2 documented? And what happens when we boot on a POWER9 in POWER8 compatibility mode? cheers