tree 62940e35988f5e2a52df10276882ec64518ee369
parent 4b12f0de33a64dfc624b2480f55b674f7fa23ef2
author Sheng Yang <sheng@linux.intel.com> 1240835743 +0800
committer Avi Kivity <avi@redhat.com> 1244623730 +0300

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>