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Re: [Xen-devel] [RFC 15/19] xen/arm: Reserve region in guest memory for device passthrough

On Wed, 18 Jun 2014, Julien Grall wrote:
> On 18/06/14 19:14, Stefano Stabellini wrote:
> > > For non-PCI passthrough this size will unlikely happen. We always map a
> > > matter of few pages per-device.
> > > 
> > > I think this size is enough for the time being. I plan to revisit it for
> > > PCI passthrough where we will be able to allocate some of them after 4G.
> > 
> > Modern GPUs can easily exceed 512MB and they work on ARM.
> If it's like on x86, passthrough GPUs may also require firmware. At least it
> looks like the case with some configuration on the Arndale, which doesn't have
> any SMMU.
> I'd like to make this series as simple as possible so we can get "quickly" a
> working solution to passthrough device with small amount of MMIO region.
> So if you don't mind I suggest to bump the amount of MMIO region to 1GB, I may
> need to shrink the first RAM bank, and think about bigger region support in a
> follow-up series.


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