From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Dave Scott <Dave.Scott@citrix.com>,
Stefano Stabellini <Stefano.Stabellini@citrix.com>,
Thomas Leonard <talex5@gmail.com>,
Anil Madhavapeddy <anil@recoil.org>
Subject: Re: mini-os: arm: grant mapping
Date: Mon, 22 Sep 2014 13:31:20 +0200 [thread overview]
Message-ID: <20140922113120.GP3486@type.bordeaux.inria.fr> (raw)
In-Reply-To: <1411384156.18331.39.camel@kazak.uk.xensource.com>
Ian Campbell, le Mon 22 Sep 2014 12:09:16 +0100, a écrit :
> On Mon, 2014-09-22 at 11:01 +0000, Dave Scott wrote:
> > I also noticed that the x86 version initialises the “demand mapping
> > area” from “max_pfn” in mm.c. I’m a bit suspicious about this on arm
> > since the grant table is being mapped in somewhere pre-ordained in the
> > device tree (If I’m reading it correctly) and there could be an
> > overlap (if we’re unlucky).
>
> AIUI the demand mapping is for the domains own allocated memory (similar
> to COW/allocate-OW memory on a normal Unix process), not for grant
> mappings, but I may be confused.
No, we only implement COW for anonymous mmap and the BSS. "demand
mapping area" is for getting virtual address space, which is used for
mapping all kinds of things (mmap, ioremap, and here, grants).
Samuel
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next prev parent reply other threads:[~2014-09-22 11:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-22 11:01 mini-os: arm: grant mapping Dave Scott
2014-09-22 11:09 ` Ian Campbell
2014-09-22 11:31 ` Samuel Thibault [this message]
2014-09-22 11:34 ` Ian Campbell
2014-09-22 11:25 ` Samuel Thibault
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