From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 11 Sep 2008 08:24:48 +0000 (+0200)
Subject: AMD IOMMU: don't assign preallocated protection domains to devices
X-Git-Tag: v2.6.28-rc1~712^2^4~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bd60b735c658e6e8c656e89771d281bcfcf51279;p=pandora-kernel.git

AMD IOMMU: don't assign preallocated protection domains to devices

In isolation mode the protection domains for the devices are
preallocated and preassigned. This is bad if a device should be passed
to a virtualization guest because the IOMMU code does not know if it is
in use by a driver. This patch changes the code to assign the device to
the preallocated domain only if there are dma mapping requests for it.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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