Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
"Two pending (non-PTI) x86 fixes:
- an Intel-MID crash fix
- and an Intel microcode loader blacklist quirk to avoid a
problematic revision"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/platform/intel-mid: Revert "Make 'bt_sfi_data' const"
x86/microcode/intel: Extend BDW late-loading with a revision check
+12
-3
+11
-2
arch/x86/kernel/cpu/microcode/intel.c
+11
-2
arch/x86/kernel/cpu/microcode/intel.c
···
910
910
{
911
911
struct cpuinfo_x86 *c = &cpu_data(cpu);
912
912
913
-
if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X) {
914
-
pr_err_once("late loading on model 79 is disabled.\n");
913
+
/*
914
+
* Late loading on model 79 with microcode revision less than 0x0b000021
915
+
* may result in a system hang. This behavior is documented in item
916
+
* BDF90, #334165 (Intel Xeon Processor E7-8800/4800 v4 Product Family).
917
+
*/
918
+
if (c->x86 == 6 &&
919
+
c->x86_model == INTEL_FAM6_BROADWELL_X &&
920
+
c->x86_mask == 0x01 &&
921
+
c->microcode < 0x0b000021) {
922
+
pr_err_once("Erratum BDF90: late loading with revision < 0x0b000021 (0x%x) disabled.\n", c->microcode);
923
+
pr_err_once("Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
915
924
return true;
916
925
}
917
926