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Message-Id: <1514292147-101928-1-git-send-email-qianyue.zj@alibaba-inc.com> Date: Tue, 26 Dec 2017 20:42:27 +0800 From: "Jia Zhang" <qianyue.zj@...baba-inc.com> To: bp@...en8.de Cc: <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>, <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <tony.luck@...el.com>, "Jia Zhang" <qianyue.zj@...baba-inc.com> Subject: [PATCH v4] x86/microcode/intel: Blacklist the specific BDW-EP for late loading Instead of blacklisting all types of Broadwell processor when running a late loading, only BDW-EP (signature 0x406f1, aka family 6, model 79, stepping 1) with the microcode version less than 0x0b000021 needs to be blacklisted. The erratum is documented in the the public documentation #334165 (See the item BDF90 for details). Signed-off-by: Jia Zhang <qianyue.zj@...baba-inc.com> --- arch/x86/kernel/cpu/microcode/intel.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 8ccdca6..79cad85 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -910,8 +910,16 @@ 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"); + /* + * The Broadwell-EP processor with the microcode version less + * then 0x0b000021 may result in system hang when running a late + * loading. 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("late loading on cpu (sig 0x406f1) is disabled " + "due to erratum causing system hang.\n"); return true; } -- 1.8.3.1
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