Hello.
AMD CPUs has this bug in VME mode:
https://forum.osdev.org/viewtopic.php?t=38562&p=313213
As the result of this bug, TF flag cannot
be cleared by POPF: it will be re-enabled
on IRET from int1 handler.
I identified that bug at least on the following
CPUs (their identification is according to
/etc/cpuinfo):
AMD FX(tm)-8350 Eight-Core Processor
AMD A10-7870K Radeon R7, 12 Compute Cores 4C+8G
AMD Ryzen 5 5600U with Radeon Graphics
Which means it spans across multiple generations.
Are there any plans at AMD to ever fix it?
