[PATCH 10/13] powerpc/64s: idle simplify KVM idle on POWER9

[Nicholas Piggin]

On Thu, 10 Aug 2017 23:14:46 +1000
Michael Ellerman <mpe at ellerman.id.au> wrote:

> Nicholas Piggin <npiggin at gmail.com> writes:
> 
> > POWER9 CPUs have independent MMU contexts per thread so KVM
> > does not have to bring sibling threads into real-mode when
> > switching MMU mode to guest. This can simplify POWER9 sleep/wake
> > paths and avoids hwsyncs.
> >
> > Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> > ---
> >  arch/powerpc/include/asm/kvm_book3s_asm.h |  4 ++++
> >  arch/powerpc/kernel/idle_book3s.S         |  8 ++-----
> >  arch/powerpc/kvm/book3s_hv.c              | 37 ++++++++++++++++++++++++++-----
> >  arch/powerpc/kvm/book3s_hv_rmhandlers.S   |  8 +++++++  
> 
> This will need to go via, or at least be shared with Paul's tree.
> 
> So if it's possible, splitting it out of this series would be easier.

I agree it's really a KVM patch, but patch 12 depends on this, 
it is a Linux patch. Not sure how you want to handle that?

Thanks,
Nick