From: Sheng Yang <sheng@linux.intel.com>
Date: Mon, 27 Apr 2009 12:35:43 +0000 (+0800)
Subject: KVM: Enable snooping control for supported hardware
X-Git-Tag: v2.6.31-rc1~393^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=522c68c4416de3cd3e11a9ff10d58e776a69ae1e;p=pandora-kernel.git

KVM: Enable snooping control for supported hardware

Memory aliases with different memory type is a problem for guest. For the guest
without assigned device, the memory type of guest memory would always been the
same as host(WB); but for the assigned device, some part of memory may be used
as DMA and then set to uncacheable memory type(UC/WC), which would be a conflict of
host memory type then be a potential issue.

Snooping control can guarantee the cache correctness of memory go through the
DMA engine of VT-d.

[avi: fix build on ia64]

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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