On Wed, 5 Dec 2018 09:27:44 +0100 Christian Borntraeger <borntrae...@de.ibm.com> wrote:
> On 05.12.2018 09:26, David Hildenbrand wrote: > > On 04.12.18 23:18, Collin Walling wrote: > >> Add migration and reset support for diagnose 318. This is a new z14 GA2 > >> hardware feature, but we can provide guest support starting with the > >> zEC12-full CPU model. > >> > >> Because new hardware introduces a new facility-availability byte in > >> the Read SCP Info block, we lose one byte in the CPU entries list > >> and must limit the maximum VCPUs to 247 (down from 248). > > > > This could break setups that upgrade/migrate. At least forward migration > > can be broken. Do we care about that? > > Can we maybe bind this feature and the cpu limit to the 4.0 machine? I think that would make sense. > > > > Can you split off > > > > 1. linux-header changes > > 2. CPU model changes? (introduction and definition of new feature, but > > not when it is used?) > > > >> > >> Signed-off-by: Collin Walling <wall...@linux.ibm.com> > >> ---