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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

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@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?

Up to 32+12== 44 bits, yes, but we know there are ARM systems with 48
bit PA out there.

> 
> Although, MMIO are described with an MFN range.
> 
> Regards,
> 



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