Re: Xen on Zen 3

[Matyáš Kroupa <kroupa.matyas@xxxxxxxxx>]

Dne úterý 7. dubna 2026 11:05:40, středoevropský letní čas, Jan Beulich 
napsal(a):
> Not exactly, there is an earlier exit from the function when num_roots is 0.
> If that line is the problem one, then presumably num_roots < num_nodes, thus
> yielding roots_per_node as 0. Sadly you didn't enable enough verbosity for
> 
>       pr_debug("Found %d AMD root devices\n", num_roots);
> 
> to actually leave a trace in the log. I'd guess the value to be 1, but there
> being multiple nodes at the same time. You may want to instrument the
> function a little more to be certain.

I booted it with either loglevel=8 or ignore_loglevel, but could not get the 
pr_debug to output anything. It did however print a lot of pci and other debug 
messages as expected.
 
> For your immediate purpose you may want to change the "!num_roots" check
> into a "num_roots < num_nodes" one (on the assumption that num_nodes
> can't be 0). Whether that's acceptable upstream I don't know, of course.

I'll try that later

Matyáš Kroupa