On Wed, 25 Oct 2017 12:01:10 +0200 Michael Ellerman <m...@ellerman.id.au> wrote:
> Nicholas Piggin <npig...@gmail.com> writes: > > > Take the DSCR value set by firmware as the dscr_default value, > > rather than zero. > > > > POWER9 recommends DSCR default to a non-zero value. > > > > From: Nicholas Piggin <npig...@gmail.com> > > --- > > This has a problem that OS which set the DSCR to non-default > > then kexec to Linux will be used as our default. I send a > > corresponding patch to skiboot which resets SPRs in opal_reinit_cpus > > which will make this do the right thing in that case. > > That doesn't work for pseries etc. > > We should reset it in the kexec down path. Okay I'll add that too. We should have a hypercall to reset all the state for us like opal_reinit_cpus I reckon, but restoring it before kexec isn't a bad idea even if we had such a thing. Thanks, Nick
