linux-kernel - Re: [PATCH 2/2] powernv/powerpc: Clear PECE1 in LPCR via stop-api only on Hotplug

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Date:   Tue, 25 Jul 2017 20:46:19 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>
Cc:     Michael Neuling <mikey@...ling.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powernv/powerpc: Clear PECE1 in LPCR via stop-api only on Hotplug

Nicholas Piggin <npiggin@...il.com> writes:
...
> I wonder if we should think about a more structured kernel API for
> modifying these kind of system registers so we always have the
> up-to-date values stored in memory. Many of them do need to be
> restored after sleep, but they don't need to be saved per-thread
> or saved every time we go to sleep.

Yes that's on my mental TODO. Paul and I have talked about it in the
past for KVM.

I'll write it down sometime so we at least remember :D

chers