Re: port-amd64/58410: x86_patch() panic with core ultra processor

[Jaromír Doleček <jaromir.dolecek%gmail.com@localhost>]

The following reply was made to PR port-amd64/58410; it has been noted by GNATS.

From: =?UTF-8?B?SmFyb23DrXIgRG9sZcSNZWs=?= <jaromir.dolecek%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-amd64/58410: x86_patch() panic with core ultra processor
Date: Wed, 10 Jul 2024 22:46:43 +0200

 I remember several PRs where active x2APIC was causing this weird
 issue which manifested later an issue with SMAP.
 Is there any specific setting to disable x2APIC in BIOS?
 
 Jaromir
 
 Le mer. 10 juil. 2024 =C3=A0 10:40, Patrick Welche <prlw1%welche.eu@localhost> a =C3=
 =A9crit :
 >
 > The following reply was made to PR port-amd64/58410; it has been noted by=
  GNATS.
 >
 > From: Patrick Welche <prlw1%welche.eu@localhost>
 > To: gnats-bugs%netbsd.org@localhost
 > Cc: matthew green <mrg%eterna23.net@localhost>
 > Subject: Re: port-amd64/58410: x86_patch() panic with core ultra processo=
 r
 > Date: Wed, 10 Jul 2024 09:38:44 +0100
 >
 >  Firing at will I disabled:
 >
 >  - SMM Security Mitigation ("However, this feature may cause compatibilit=
 y
 >    issues or loss of functionality with some legacy tools and application=
 s")
 >  - OS Kernel DMA protection
 >
 >  and still see the panic. (Don't see anything else to turn off)
 >
 >  Now with a GENERICDBG kernel I can see dmesg in ddb:
 >
 >  ioapic0 at mainbus0 apid 2: pa 0xfec00000, version 0x20, 120 pins
 >  x2APIC disabled by user and enabled by BIOS; ignoring user setting.
 >  bogus MADT X2APIC entry (id =3D 0x10 11 18 19 20 21 28...
 >
 >  On the laptop I am writing this on, I see
 >
 >  ioapic0 at mainbus0 apid 2: pa 0xfec00000, version 0x20, 120 pins
 >  cpu0 at mainbus0 apid 0
 >
 >  which means the cpu0 etc are missing, with bogus MADT instead
 >
 >
 >  I also get the panic with "boot -1":
 >
 >  x86_patch() at netbsd:x86_patch+0xfb  (arch/x86/x86/patch.c:356)
 >  cpu_boot_secondary_processors()  + 0x16
 >  main() + 0x3a2
 >