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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-03-18 at 11:25 +0000, David Vrabel wrote:
> 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.

Is this the smoking gun then? Do we have any idea what to do about it?

Ian.



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