Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752985Ab2HRI36 (ORCPT ); Sat, 18 Aug 2012 04:29:58 -0400 Received: from mga02.intel.com ([134.134.136.20]:10632 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750903Ab2HRI3z (ORCPT ); Sat, 18 Aug 2012 04:29:55 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.77,790,1336374000"; d="scan'208";a="182264733" From: "Fenghua Yu" To: "H Peter Anvin" , "Ingo Molnar" , "Thomas Gleixner" , "Asit K Mallick" , "Tigran Aivazian" , "Andreas Herrmann" , "Borislav Petkov" , "linux-kernel" , "x86" Cc: "Fenghua Yu" Subject: [PATCH 00/11] x86/microcode: Early load microcode Date: Sat, 18 Aug 2012 01:15:18 -0700 Message-Id: <1345277729-8399-1-git-send-email-fenghua.yu@intel.com> X-Mailer: git-send-email 1.7.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3285 Lines: 67 From: Fenghua Yu The problem in current microcode loading method is that we load a microcode way, way too late; ideally we should load it before turning paging on. This may only be practical on 32 bits since we can't get to 64-bit mode without paging on, but we should still do it as early as at all possible. Similarly, we should load the microcode update as early as possible during AP bringup and when processors are brought back online after hotplug or S3/S4. In order to do that, the microcode patch needs to be permanently present in kernel memory. Each individual patch is fairly small, so that is OK, but the entire blob with support for each CPU is too big. Since only CPU's with same model can be in the same platform, we store microcode with the same model as BSP. Later on AP's can upload microcode from the saved microcodep patches. Note, however, that Linux users have gotten used to being able to install a microcode patch in the field without having a reboot; we support that model too. Fenghua Yu (11): Documentation/x86: Early load microcode x86/lib/cpio.c: Find cpio data by its file name x86/microcode_intel.h: Define functions and macros for early load ucode x86/microcode_core_early.c: Define interfaces for early load ucode x86/microcode_intel_lib.c: Early update ucode on Intel's CPU x86/microcode_intel_early.c: Early update ucode on Intel's CPU x86/head_32.S: Early update ucode in 32-bit x86/head64.c: Early update ucode in 64-bit x86/smpboot.c: Early update ucode on AP x86/mm/init.c: Copy ucode from initrd image to memory x86/Kconfig: Configurations to enable/disable the feature Documentation/x86/earlyucode.txt | 43 +++ arch/x86/Kconfig | 22 ++ arch/x86/include/asm/cpio.h | 10 + arch/x86/include/asm/microcode.h | 23 ++ arch/x86/include/asm/microcode_intel.h | 103 +++++++ arch/x86/kernel/Makefile | 3 + arch/x86/kernel/head64.c | 6 + arch/x86/kernel/head_32.S | 6 + arch/x86/kernel/microcode_core.c | 7 +- arch/x86/kernel/microcode_core_early.c | 74 +++++ arch/x86/kernel/microcode_intel.c | 185 +------------ arch/x86/kernel/microcode_intel_early.c | 482 +++++++++++++++++++++++++++++++ arch/x86/kernel/microcode_intel_lib.c | 163 +++++++++++ arch/x86/kernel/smpboot.c | 7 + arch/x86/lib/Makefile | 2 + arch/x86/lib/cpio.c | 179 ++++++++++++ arch/x86/mm/init.c | 10 + 17 files changed, 1144 insertions(+), 181 deletions(-) create mode 100644 Documentation/x86/earlyucode.txt create mode 100644 arch/x86/include/asm/cpio.h create mode 100644 arch/x86/include/asm/microcode_intel.h create mode 100644 arch/x86/kernel/microcode_core_early.c create mode 100644 arch/x86/kernel/microcode_intel_early.c create mode 100644 arch/x86/kernel/microcode_intel_lib.c create mode 100644 arch/x86/lib/cpio.c -- 1.7.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/