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- Remove the unconditional cache writeback and invalidation after loading the

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microcode patch on Intel as this was addressing a microcode bug for which
   there is a concrete microcode revision check instead
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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
This commit is contained in:
Linus Torvalds 2024-11-19 12:13:16 -08:00
commit ab713e7099
1 changed files with 2 additions and 8 deletions
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10
arch/x86/kernel/cpu/microcode/intel.c
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@ -319,12 +319,6 @@ static enum ucode_state __apply_microcode(struct ucode_cpu_info *uci,
return UCODE_OK;
}
/*
* Writeback and invalidate caches before updating microcode to avoid
* internal issues depending on what the microcode is updating.
*/
native_wbinvd();
/* write microcode via MSR 0x79 */
native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
@ -574,14 +568,14 @@ static bool is_blacklisted(unsigned int cpu)
/*
* Late loading on model 79 with microcode revision less than 0x0b000021
* and LLC size per core bigger than 2.5MB may result in a system hang.
* This behavior is documented in item BDF90, #334165 (Intel Xeon
* This behavior is documented in item BDX90, #334165 (Intel Xeon
* Processor E7-8800/4800 v4 Product Family).
*/
if (c->x86_vfm == INTEL_BROADWELL_X &&
c->x86_stepping == 0x01 &&
llc_size_per_core > 2621440 &&
c->microcode < 0x0b000021) {
pr_err_once("Erratum BDF90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
pr_err_once("Erratum BDX90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
pr_err_once("Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
return true;
}