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

On Thu, 10 Aug 2017 23:14:46 +1000
Michael Ellerman [off-list ref] wrote:

Nicholas Piggin [off-list ref] writes:

quoted

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@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