Re: [Xen-devel] kernel BUG at nvme/host/pci.c

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Fri, Jul 14, 2017 at 01:08:47PM -0400, Keith Busch wrote:
> > So LVM2 backed by md raid1 isn't compatible with newer hardware... Any
> > suggestions?
> 
> It's not that LVM2 or RAID isn't compatible. Either the IOMMU isn't
> compatible if can use different page offsets for DMA addresses than the
> physical aaddresses, or the driver for it is broken. The DMA addresses
> in this mapped SGL look completely broken, at least, since the last 4
> entries are all the same address. That'll corrupt data.

Given that this is a Xen system I wonder if swiotlb-xen is involved
here, which does some odd chunking of dma translations?

> 
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---end quoted text---

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