linux-kernel - Re: [PATCH 2/2 v2] ARM: KVM: user_mem_abort: support stage 2 MMIO page mapping

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Message-ID: <20140630090843.GB9233@cbox>
Date:	Mon, 30 Jun 2014 02:08:43 -0700
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Kim Phillips <kim.phillips@...escale.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Eric Auger <eric.auger@...aro.org>,
	Kim Phillips <kim.phillips@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2 v2] ARM: KVM: user_mem_abort: support stage 2 MMIO
 page mapping

On Thu, Jun 26, 2014 at 09:46:26AM +0100, Will Deacon wrote:
> On Thu, Jun 26, 2014 at 01:45:51AM +0100, Kim Phillips wrote:
> > From: Kim Phillips <kim.phillips@...aro.org>
> > 
> > A userspace process can map device MMIO memory via VFIO or /dev/mem,
> > e.g., for platform device passthrough support in QEMU.
> > 
> > During early development, we found the PAGE_S2 memory type being used
> > for MMIO mappings.  This patch corrects that by using the more strongly
> > ordered memory type for device MMIO mappings: PAGE_S2_DEVICE.
> > 
> > Signed-off-by: Kim Phillips <kim.phillips@...aro.org>
> > Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
> > ---
> > Hi, here's a v2, upon request:
> > 
> > - rebased onto today's mainline ToT
> > - mmu.o-build tested only (ToT build doesn't complete)
> > - made commit text less terse
> > - added Christoffer's ack
> 
> Thanks for reposting this so quickly!
> 
>   Acked-by: Will Deacon <will.deacon@....com>
> 
Thanks,

Marc, will you apply this one to kvmarm/queue [and kvmarm/next]?

-Christoffer
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