Re: [REGRESSION][BISECTED] Early boot hangs since f0551af02130

[Thomas Gleixner <tglx@linutronix.de>]

On Sat, Jul 27 2024 at 13:56, rob@durendal.co.uk wrote:
> * Thomas Gleixner (tglx@linutronix.de) wrote:
>>On Fri, Jul 26 2024 at 23:40, rob@durendal.co.uk wrote:
>>> I have also tested on the non-patched mainline version 6.10 with
>>> 'nointremap' and it also boots
>>
>>Thanks for confirming. I'm pretty sure by now that this is the same
>>problem as the one in this thread:
>>
>>   https://lore.kernel.org/r/87wmntkhak.ffs@tglx
>>
>>That got resolved by a BIOS update, but for testing sake it would be
>>useful to give the patch in the link above a try on your machine.
>
> Yes this boots.  I'll look into updating the BIOS.

Thanks for testing! It's definitely the same problem and it seems to be
affecting Zen1 CPUs with a stale BIOS/firmware version.

While updating the BIOS is a good idea in any case, I'm seriously
pondering to get rid of the logical destination mode on 64 bit
completely and just default to physical destination mode.

I'll send out a patch later.

Thanks,

        tglx