Just noticed vanilla v6.15-rc7 fails to boot on Xen 4.17 (Ubuntu Xen
package) in a KVM guest.  So I did a bisect, and it says:

872df34d7c51a79523820ea6a14860398c639b87 is the first bad commit
commit 872df34d7c51a79523820ea6a14860398c639b87
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Mon Oct 14 10:05:48 2024 -0700

     x86/its: Use dynamic thunks for indirect branches


Attached is the serial console log and my kernel config.

Thanks!
     Xin