[Pkg-xen-devel] Bug#988477: Bug#988477: xen-hypervisor-4.14-amd64: xen dmesg shows (XEN) AMD-Vi: IO_PAGE_FAULT on sata pci device

[Elliott Mitchell]

On Sun, May 18, 2025 at 02:10:25PM +0200, Maximilian Engelhardt wrote:
> On Montag, 14. April 2025 00:22:01 CEST Elliott Mitchell wrote:
> > 
> > Do any of the Debian maintainers have an AMD machine setup for debugging?
> > I'm not very well setup for debugging this particular issue.  If you've
> > got an AMD machine with a pair of available SATA ports (including SATA
> > power!), I could send a pair of SATA devices known to readily reproduce
> > the issue.
> 
> I'm not aware of anybody in our team having hardware where they can reproduce 
> this issue, else I'm sure they would have already provided feedback here. 
> There are also not many reports here of people running into this problem. Thus 
> I assume it needs a special (and probably rare) hardware combination to 
> trigger this.
> One thing I can add is that I have been running software raid1 with Xen on two 
> SATA SSDs on an Intel CPU since many years without seeing any data corruption.

I'm skeptical of it being rare, but certainly uncommon.  You've got some
similarity to the reproductions, but there are differences.

First question, what brand/model are the SSDs?  Samsung SSDs are known to
be effected (severely effected for some models), while Crucial/Micron
SSDs are uneffected (some models might be mildly effected).

Second question, where are the SATA ports?  They on-motherboard?  Add-on
card?  The reproductions were with on-motherboard ports.

What generation is your processor?  Are you sure it has an IOMMU and Xen
is driving the IOMMU?  I had suspected Intel systems would be effected,
but you may have disproven this.

> As Debian packages versions of xen, linux, etc. have changed a bit since the 
> last time this issue was reported as reproduced in this bug, it would be good 
> to get confirmation the problem is still there in Debian unstable or testing.

This is possible.


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