linux-kernel - Re: [GIT PULL] KVM changes for 4.8 merge window

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Date:	Wed, 03 Aug 2016 13:21:49 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Paolo Bonzini <pbonzini@...hat.com>, torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, rkrcmar@...hat.com,
	kvm@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Paul Mackerras <paulus@...abs.org>
Subject: Re: [GIT PULL] KVM changes for 4.8 merge window

Paolo Bonzini <pbonzini@...hat.com> writes:
...
> - arch/powerpc: what a mess.  For the idle_book3s.S conflict, the KVM
> tree is the right one; everything else is trivial.  In this case I am
> not quite sure what went wrong.  The commit that is causing the mess
> (fd7bacbca47a, "KVM: PPC: Book3S HV: Fix TB corruption in guest exit
> path on HMI interrupt", 2016-05-15) touches both arch/powerpc/kernel/
> and arch/powerpc/kvm/.  It's large, but at 396 insertions/5 deletions
> I guessed that it wasn't really possible to split it and that the 5
> deletions wouldn't conflict.  That wasn't the case.

In fact I think the problem is that this patch shouldn't have gone via the KVM
tree at all.

If you look at the diffstat, it doesn't touch anything in generic KVM, but lots
of arch code:

 arch/powerpc/include/asm/hmi.h          |  45 ++++++++++++++++++++
 arch/powerpc/include/asm/paca.h         |   6 +++
 arch/powerpc/kernel/Makefile            |   2 +-
 arch/powerpc/kernel/exceptions-64s.S    |   4 +-
 arch/powerpc/kernel/hmi.c               |  56 +++++++++++++++++++++++++
 arch/powerpc/kernel/idle_power7.S       |   5 ++-
 arch/powerpc/kernel/traps.c             |   5 +++
 arch/powerpc/kvm/book3s_hv.c            |  37 +++++++++++++++++
 arch/powerpc/kvm/book3s_hv_ras.c        | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S |  65 ++++++++++++++++++++++++++++-


Presumably Paul wanted it in his kvm-ppc tree so it would be tested with the
rest of the KVM stuff, but we should have done that with a topic branch in the
powerpc tree, that we both merged.

cheers