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author | Ross Zwisler | 2018-02-03 08:26:26 +0100 |
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committer | Ross Zwisler | 2018-02-03 08:26:26 +0100 |
commit | ee95f4059a833839bf52972191b2d4c3d3cec552 (patch) | |
tree | a1c8587d9b82e64a75dde376a90a3d69b0f4847a /arch/x86/kernel/cpu/microcode/intel.c | |
parent | Merge branch 'for-4.16/dax' into libnvdimm-for-next (diff) | |
parent | nfit-test: Add platform cap support from ACPI 6.2a to test (diff) | |
download | kernel-qcow2-linux-ee95f4059a833839bf52972191b2d4c3d3cec552.tar.gz kernel-qcow2-linux-ee95f4059a833839bf52972191b2d4c3d3cec552.tar.xz kernel-qcow2-linux-ee95f4059a833839bf52972191b2d4c3d3cec552.zip |
Merge branch 'for-4.16/nfit' into libnvdimm-for-next
Diffstat (limited to 'arch/x86/kernel/cpu/microcode/intel.c')
-rw-r--r-- | arch/x86/kernel/cpu/microcode/intel.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 8ccdca6d3f9e..d9e460fc7a3b 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -910,8 +910,17 @@ static bool is_blacklisted(unsigned int cpu) { struct cpuinfo_x86 *c = &cpu_data(cpu); - if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X) { - pr_err_once("late loading on model 79 is disabled.\n"); + /* + * Late loading on model 79 with microcode revision less than 0x0b000021 + * may result in a system hang. This behavior is documented in item + * BDF90, #334165 (Intel Xeon Processor E7-8800/4800 v4 Product Family). + */ + if (c->x86 == 6 && + c->x86_model == INTEL_FAM6_BROADWELL_X && + c->x86_mask == 0x01 && + c->microcode < 0x0b000021) { + pr_err_once("Erratum BDF90: 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; } |