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

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Message-ID: <53B12A6A.5050105@arm.com>
Date:	Mon, 30 Jun 2014 10:14:18 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Christoffer Dall <christoffer.dall@...aro.org>
CC:	Will Deacon <Will.Deacon@....com>,
	Kim Phillips <kim.phillips@...escale.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 30/06/14 10:08, Christoffer Dall wrote:
> 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]?

Yup, adding it.

	M.
-- 
Jazz is not dead. It just smells funny...
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