[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC 15/19] xen/arm: Reserve region in guest memory for device passthrough
On Wed, 2014-06-18 at 19:33 +0100, 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. I think so long as we aren't painting ourselves into any ABI corners (I don't think we are) then defering the handling of large devices is fine. > > Regards, > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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