linux-kernel - Re: [PATCH 00/11] xen: allow usermode to map granted pages

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Message-ID: <alpine.DEB.2.00.1012151341270.2390@kaball-desktop>
Date:	Wed, 15 Dec 2010 13:43:59 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>
Subject: 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
available here:

git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.37-rc5-gntdev-2

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