xen/swiotlb: With more than 4GB on 64-bit, disable the native SWIOTLB.

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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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Konrad Rzeszutek Wilk 2012-07-27 20:16:00 -04:00

parent 988f0e24bb

commit fc2341df9e

1 changed files with 14 additions and 0 deletions

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arch/x86/xen/pci-swiotlb-xen.c

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