Radeon Pro W5500 in passthrough with vfio generates spurious NMI reason 25

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Dear AMD,

I recently posted a bug report on Launchpad (https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.13/+bug/1963893). I hoped it would reach you via that channel, but I don't really see anything moving.

We have three of your W5500 cards in three identical EPYC 7302P HP DL325 Gen10 servers, as an experiment. We wanted to use them in passthrough through OpenStack, which works more-or-less. However, we notice quite some suprious NMI's through with "reason 25" appear when we do this. We don't have such issues with our RTX 4000 card in another of those servers. You'll find dmesg dumps, both with the vendor-reset and without it on the launchpad bug report.

Please do let me know if you need more data points in order to reproduce this behaviour. If this is not the correct list, I would gladly go through a different channel upon your redirect.

Best regards,

Ruben De Smet



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