On 01.06.24 09:20, Thomas Gleixner wrote: > On Sat, Jun 01 2024 at 09:06, Linux regression tracking (Thorsten Leemhuis) wrote: >> On 31.05.24 10:42, Thomas Gleixner wrote: >>> On Fri, May 31 2024 at 10:33, Thomas Gleixner wrote: >> >>> --- >>> Subject: x86/topology/intel: Unlock CPUID before evaluating anything >>> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> >>> Date: Thu, 30 May 2024 17:29:18 +0200 >>> >>> Intel CPUs have a MSR bit to limit CPUID enumeration to leaf two. If this >>> bit is set by the BIOS then CPUID evaluation including topology enumeration >>> does not work correctly as the evaluation code does not try to analyze any >>> leaf greater than two. >>> [...] >> >> TWIMC, I noticed a bug report with a "12 × 12th Gen Intel® Core™ >> i7-1255U" where the reporter also noticed a lot of messages like these: >> >> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 1 shift 7 != 6 >> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 2 shift 7 != 6 >> archlinux kernel: [Firmware Bug]: CPU4: Topology domain 3 shift 7 != 6 >> >> Asked the reporter to test this patch. For details see: >> https://bugzilla.kernel.org/show_bug.cgi?id=218879 > > Won't help. See: https://lore.kernel.org/all/87plt26m2b.ffs@tglx/ Ahh, it was the other problem in this thread. Sorry for not noticing that, had not followed things that closely. Forwarded that info to the ticket. Many thx! Ciao, Thorsten
