[Bug 206579] KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes

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https://bugzilla.kernel.org/show_bug.cgi?id=206579

--- Comment #27 from muncrief (rmuncrief@humanavance.com) ---
Created attachment 287667
  --> https://bugzilla.kernel.org/attachment.cgi?id=287667&action=edit
avic_inhibit_reasons debug information

Oh, that was so cool Suravee!

I applied the initial svm.c and debug patch and tested both host-passthrough
and EPYC-IBPB configurations, and avic failed with both.

With host-passthrough the avic_inhibit_reasons value immediately changed from 0
to 20, and then a few seconds later changed to 28.

With the EPYC-IBPB the avic_inhibit_reasons value immediately changed from 0 to
16, and then a few seconds later changed to 24.

I wanted to give you as much accurate information as possible so I attached the
avic_inhibit_reason values, my physical machine and domain capabilities, and
the command lines and XML files used in the tests for each configuration to
this comment.

By the way, I ran multiple tests with both configurations. I used the defaults,
then explicit 1-8-2 topology, and with host-passthrough I removed the cache
passthrough and VM hiding. I also ran all tests again using the second
variation of the svm.c patch. Unfortunately nothing changed the avic failure
though.

I hope this information helps, and am looking forward to assisting you
gentlemen further in any way possible.

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