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

[Hans van Kranenburg]

severity 988477 normal
tags 988477 + moreinfo + upstream - bullseye-ignore
thanks

Hi!

On 6/13/21 3:58 PM, Imre Szőllősi wrote:
> i tested on 4th hw
> 
> 4. asus m4n78 pro, phenom ii x4 905e, md raid1, 2x samsung 1TB 860evo, 
> lvm: problem does not appear
> 
> as i see, not all mb/chipset/sata pcie device affected

Thanks for your report, and for trying out different combinations of
hardware.

While doing a short internet search about the problems you're seeing
while using AMD ryzen, sata, nvme and iommu, I suspect this problem does
not have a lot to do with Xen specifically, but more with the hardware
and its firmware.

This also means that it's not a Debian packaging problem, and it cannot
be fixed by me (or the Debian Xen team). If you want to research this
problem more, I can maybe be of some help by providing suggestions.
Still, you will have to do all of the actual work, since I do not have
your hardware here.

The first thing I would suggest is to try reproduce the problem when
booting with just Linux without Xen, and then trying the dbench test.

If you don't actually need to directly pass-through hardware to a Xen
guest, you can also try disabling iommu, or researching other iommu=
options that can serve as a workaround.

In any case, further reports will need to have more detailed
information. For example, instead of "there are a lot of messages",
provide a text attachment with a piece of logging that shows these messages.

I'm tagging this bug 'moreinfo' now, since it will depend on your
availability and abilities to work on it to have it advance.

Have fun,
Hans van Kranenburg