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xen/swiotlb: With more than 4GB on 64-bit, disable the native SWIOTLB.
authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Sat, 28 Jul 2012 00:16:00 +0000 (20:16 -0400)
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tue, 21 Aug 2012 18:47:24 +0000 (14:47 -0400)
If a PV guest is booted the native SWIOTLB should not be
turned on. It does not help us (we don't have any PCI devices)
and it eats 64MB of good memory. In the case of PV guests
with PCI devices we need the Xen-SWIOTLB one.

[v1: Rewrite comment per Stefano's suggestion]
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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