Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'x86_microcode_for_v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 microcode loader update from Borislav Petkov:
- Remove the unconditional cache writeback and invalidation after
loading the microcode patch on Intel as this was addressing a
microcode bug for which there is a concrete microcode revision check
instead
* tag 'x86_microcode_for_v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/intel: Remove unnecessary cache writeback and invalidation
+2
-8
+2
-8
arch/x86/kernel/cpu/microcode/intel.c
+2
-8
arch/x86/kernel/cpu/microcode/intel.c
···
319
319
return UCODE_OK;
320
320
}
321
321
322
-
/*
323
-
* Writeback and invalidate caches before updating microcode to avoid
324
-
* internal issues depending on what the microcode is updating.
325
-
*/
326
-
native_wbinvd();
327
-
328
322
/* write microcode via MSR 0x79 */
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323
native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
330
324
···
568
574
/*
569
575
* Late loading on model 79 with microcode revision less than 0x0b000021
570
576
* and LLC size per core bigger than 2.5MB may result in a system hang.
571
-
* This behavior is documented in item BDF90, #334165 (Intel Xeon
577
+
* This behavior is documented in item BDX90, #334165 (Intel Xeon
572
578
* Processor E7-8800/4800 v4 Product Family).
573
579
*/
574
580
if (c->x86_vfm == INTEL_BROADWELL_X &&
575
581
c->x86_stepping == 0x01 &&
576
582
llc_size_per_core > 2621440 &&
577
583
c->microcode < 0x0b000021) {
578
-
pr_err_once("Erratum BDF90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
584
+
pr_err_once("Erratum BDX90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
579
585
pr_err_once("Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
580
586
return true;
581
587
}