Re: [Xen-devel] [PATCH v3 20/24] xen/passthrough: Extend XEN_DOMCTL_assign_device to support DT device

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.03.15 at 13:15, <julien.grall@xxxxxxxxxx> wrote:
> Hi Jan,
> 
> On 11/03/2015 08:53, Jan Beulich wrote:
>>>>> On 10.03.15 at 23:45, <dgdegra@xxxxxxxxxxxxx> 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?

No, that only covers up to 1Tb.

Jan


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