From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH v3 20/24] xen/passthrough: Extend
 XEN_DOMCTL_assign_device to support DT device
Date: Wed, 11 Mar 2015 12:35:05 +0000
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To: Ian Campbell <ian.campbell@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Machon Gregory <mbgrego@tycho.ncsc.mil>, Ian Jackson <ian.jackson@eu.citrix.com>, tim@xen.org, stefano.stabellini@citrix.com, Jan Beulich <JBeulich@suse.com>, xen-devel@lists.xenproject.org, Daniel De Graaf <dgdegra@tycho.nsa.gov>
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On 11/03/2015 12:23, Ian Campbell wrote:
> On Wed, 2015-03-11 at 12:15 +0000, Julien Grall wrote:
>> Hi Jan,
>>
>> On 11/03/2015 08:53, Jan Beulich wrote:
>>>>>> On 10.03.15 at 23:45, <dgdegra@tycho.nsa.gov> wrote:
>>>> In order to do static labeling for device passthrough, the nodes in a
>>>> device tree need a 32-bit numeric identifier.  IO memory uses the MFN,
>>>> PCI devices use SBDF, and IRQs and x86 legacy IOs just use the number.
>>>
>>> A 32-bit number can't uniquely identify an MMIO MFN.
>>
>> Isn't 32-bit enough to describe an MFN?
>
> Up to 32+12== 44 bits, yes, but we know there are ARM systems with 48
> bit PA out there.

Hmmm... checkpolicy and flask will have to be fixed then.

Regards,

-- 
Julien Grall