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[Xen-devel] RE: Tmem vs order>0 allocation, workaround RFC

from [Jan Beulich] [Permanent Link][Original]
To: "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
Subject: [Xen-devel] RE: Tmem vs order>0 allocation, workaround RFC
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 16 Feb 2010 15:15:41 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, AndrewPeace <Andrew.Peace@xxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, kurt.hackel@xxxxxxxxxx, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, TimDeegan <Tim.Deegan@xxxxxxxxxxxxx>, Patrick Colp <pjcolp@xxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Grzegorz Milos <gm281@xxxxxxxxx>
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>>> Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 16.02.10 16:05 >>>
>Under what circumstances does dom0 require single-page-below-4G
>allocations?  Is it only for bounce buffers for PCI passthrough
>of old devices with 32-bit addressing limitations?  Or am I
>missing a much more common case?

Not just for pass-through; all devices only supporting 32-bit
addressing would have such requirements, and particularly common
ones are display adapters which have DRM/AGP drivers loaded for
them.

Jan


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