Re: [Xen-devel] [linux-linus test] 25478: regressions - FAIL

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 18/03/14 11:10, Ian Campbell wrote:
> 
> There are 64-bit bars but they don't have addresses >4G so I think they
> don't count.

If a device only has 32-bit BARs it's generally not capable of handling
64-bit DMA addresses and we can point and laugh at the card.

mptsas is a driver that uses dma_get_required_mask() to determine a
"suitable" DMA mask -- but under Xen dma_get_required_mask() may return
the wrong mask since it only gets the physical RAM range and not machine
addresses.

David

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