From: Nicholas Piggin <npiggin@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org,
"Gautham R . Shenoy" <ego@linux.vnet.ibm.com>,
kvm-ppc@vger.kernel.org
Subject: Re: [PATCH 10/13] powerpc/64s: idle simplify KVM idle on POWER9
Date: Thu, 10 Aug 2017 23:53:06 +1000 [thread overview]
Message-ID: <20170810235251.65f3046a@roar.ozlabs.ibm.com> (raw)
In-Reply-To: <87zib7lg3d.fsf@concordia.ellerman.id.au>
On Thu, 10 Aug 2017 23:14:46 +1000
Michael Ellerman <mpe@ellerman.id.au> wrote:
> Nicholas Piggin <npiggin@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@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
next prev parent reply other threads:[~2017-08-10 13:53 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-05 17:02 [PATCH 00/13] idle and soft-irq improvements and POWER9 idle optimisation Nicholas Piggin
2017-08-05 17:02 ` [PATCH 01/13] powerpc/64s: masked interrupt avoid branch Nicholas Piggin
2017-08-05 17:02 ` [PATCH 02/13] powerpc/64s: masked interrupt avoid instruction Nicholas Piggin
2017-08-05 17:02 ` [PATCH 03/13] powerpc/64s: masked interrupt returns to kernel so avoid r13 restore Nicholas Piggin
2017-08-05 17:02 ` [PATCH 04/13] powerpc/64: cleanup __check_irq_replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 05/13] powerpc/64s: irq replay merge HV and non-HV paths for doorbell replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 06/13] powerpc/64s: irq replay external use the HV handler in HV mode on POWER9 Nicholas Piggin
2017-08-05 17:02 ` [PATCH 07/13] powerpc/64: remove redundant instruction in interrupt replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 08/13] powerpc/64s: irq replay remove spurious irq reason Nicholas Piggin
2017-08-05 23:00 ` Benjamin Herrenschmidt
2017-08-06 0:51 ` Nicholas Piggin
2017-08-10 13:12 ` Michael Ellerman
2017-08-05 17:02 ` [PATCH 09/13] powerpc/64: runlatch CTRL[RUN] set optimisation Nicholas Piggin
2017-08-05 17:02 ` [PATCH 10/13] powerpc/64s: idle simplify KVM idle on POWER9 Nicholas Piggin
2017-08-08 10:36 ` Gautham R Shenoy
2017-08-08 12:42 ` Nicholas Piggin
2017-08-10 6:24 ` Gautham R Shenoy
2017-08-10 13:14 ` Michael Ellerman
2017-08-10 13:53 ` Nicholas Piggin [this message]
2017-08-05 17:02 ` [PATCH 11/13] powerpc/64s: idle POWER9 can execute stop without ptesync Nicholas Piggin
2017-08-08 10:37 ` Gautham R Shenoy
2017-08-10 13:15 ` Michael Ellerman
2017-08-10 14:03 ` Nicholas Piggin
2017-08-05 17:02 ` [PATCH 12/13] powerpc/64s: idle POWER9 can execute stop in virtual mode Nicholas Piggin
2017-08-05 22:57 ` Benjamin Herrenschmidt
2017-08-08 10:45 ` Gautham R Shenoy
2017-08-05 17:02 ` [PATCH 13/13] powerpc/64s: idle ESL=0 stop can avoid all save/restore overhead Nicholas Piggin
2017-08-05 17:11 ` Nicholas Piggin
2017-08-08 10:49 ` Gautham R Shenoy
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