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[Xen-devel] Re: [PATCH 00/11] xen: allow usermode to map granted pages
On Wed, 15 Dec 2010, Stefano Stabellini wrote:
> Hi all,
> this patch series introduces the gntdev device that allows usermode
> to map granted pages; gntdev is used by qemu to implement Xen backends
> in userspace.
> Considering that granted pages still have the same entry in the m2p
> as before being granted, the following patches also add a mechanism to
> override portions of the m2p so that we can find out the pfn
> corresponding to the mfn of a granted page in the "receiver" domain.
> This is needed so that we can have pte_page work correctly for these
> pages. Once this requirement is satisfied, __get_user_pages_fast can
> work on granted pages and userspace applications (the xen block backend
> implemented in qemu) can use AIO on them.
I forgot to add that a branch with this series based on 2.6.37-rc5 is
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