[PATCH 0/2] dma,x86,xen: fix dma_get_required_mask() when dma != phys address

[David Vrabel]

x86 uses the generic dma_get_required_mask() which assumes that DMA
address == physical address.  For Xen PV guests this is not the case
and certain drivers will cause excessive use of the SWIOTLB.

Patch #1 is a straight forward refactoring of a common function.

Patch #2 addes the required arch-specific implementation of
dma_get_required_mask() to x86.

David

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