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 Ciao, Thorsten #regzbot fix: x86/topology/intel: Unlock CPUID before evaluating anything
