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

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Message-ID: <20140626084625.GA376@arm.com>
Date:	Thu, 26 Jun 2014 09:46:26 +0100
From:	Will Deacon <will.deacon@....com>
To:	Kim Phillips <kim.phillips@...escale.com>
Cc:	Marc Zyngier <Marc.Zyngier@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	"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 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>

Will
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