[PATCH 0/8] Support for 24x7 hcall interface version 2

[Michael Ellerman]

Thiago Jung Bauermann <bauerman at 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