linux-kernel - Re: [PATCH 4/4] PF: Async page fault support on s390

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Message-ID: <20130711105822.GI8575@redhat.com>
Date:	Thu, 11 Jul 2013 13:58:22 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	Dominik Dingel <dingel@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Xiantao Zhang <xiantao.zhang@...el.com>,
	Alexander Graf <agraf@...e.de>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Ralf Baechle <ralf@...ux-mips.org>, kvm@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] PF: Async page fault support on s390

On Thu, Jul 11, 2013 at 12:41:37PM +0200, Christian Borntraeger wrote:
> On 11/07/13 11:04, Gleb Natapov wrote:
> > On Wed, Jul 10, 2013 at 02:59:55PM +0200, Dominik Dingel wrote:
> >> This patch enables async page faults for s390 kvm guests.
> >> It provides the userspace API to enable, disable or get the status of this
> >> feature. Also it includes the diagnose code, called by the guest to enable
> >> async page faults.
> >>
> >> The async page faults will use an already existing guest interface for this
> >> purpose, as described in "CP Programming Services (SC24-6084)".
> >>
> >> Signed-off-by: Dominik Dingel <dingel@...ux.vnet.ibm.com>
> > Christian, looks good now?
> 
> Looks good, but I just had a  discussion with Dominik about several other cases 
> (guest driven reboot, qemu driven reboot, life migration). This patch should 
> allow all these cases (independent from this patch we need an ioctl to flush the
> list of pending interrupts to do so, but reboot is currently broken in that
> regard anyway - patch is currently being looked at)
> 
> We are currently discussion if we should get rid of the APF_STATUS and let 
> the kernel wait for outstanding page faults before returning from KVM_RUN
> or if we go with this patch and let userspace wait for completion. 
> 
> Will discuss this with Dominik, Conny and Alex. So lets defer that till next
> week, ok?
> 
Sure.

--
			Gleb.
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