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Re: [Xen-devel] [PATCH v3 0/8] xen: arm: Use super pages in p2m

Hi Ian,

On 06/26/2014 11:16 AM, Ian Campbell wrote:
> The following series adds support for superpage mappings (1G and 2M) in
> the p2m for dom0 and domU.
> At the moment it is not possible to allocate 1G regions to guests,
> because this is gated on multipage_allocation_permitted() which
> currently (incorrectly) returns false for dom0 on ARM.

OOI, why multipage_allocation_permitted is gated with iomem_caps?

It looks wrong to me, as mapping an MMIO region in the guest will allow
him to use 1G mapping.

> This is fixed by
> Arianna's "arch/arm: domain build: let dom0 access I/O memory of mapped
> devices" (which initialises iomem_caps for dom0).

IIRC, this has been pushed a month ago on upstream.


Julien Grall

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