From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH v3 0/8] xen: arm: Use super pages in p2m
Date: Thu, 26 Jun 2014 16:03:08 +0100
Message-ID: <53AC362C.303@linaro.org>
References: <1403777793.16595.21.camel@kazak.uk.xensource.com>
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To: Ian Campbell <Ian.Campbell@citrix.com>, xen-devel <xen-devel@lists.xen.org>, Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Tim Deegan <tim@xen.org>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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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.

Regards,

-- 
Julien Grall