Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RAS changes from Ingo Molnar:
 "The main system reliability related changes were from x86, but also
  some generic RAS changes:

   - AMD MCE error injection subsystem enhancements.  (Aravind
     Gopalakrishnan)

   - Fix MCE and CPU hotplug interaction bug.  (Ashok Raj)

   - kcrash bootup robustness fix.  (Baoquan He)

   - kcrash cleanups.  (Borislav Petkov)

   - x86 microcode driver rework: simplify it by unmodularizing it and
     other cleanups.  (Borislav Petkov)"

* 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits)
  x86/mce: Add a default case to the switch in __mcheck_cpu_ancient_init()
  x86/mce: Add a Scalable MCA vendor flags bit
  MAINTAINERS: Unify the microcode driver section
  x86/microcode/intel: Move #ifdef DEBUG inside the function
  x86/microcode/amd: Remove maintainers from comments
  x86/microcode: Remove modularization leftovers
  x86/microcode...

MAINTAINERS

@@ -660,11 +660,6 @@ F:	drivers/gpu/drm/radeon/radeon_kfd.c
 F:	drivers/gpu/drm/radeon/radeon_kfd.h
 F:	include/uapi/linux/kfd_ioctl.h
 
-AMD MICROCODE UPDATE SUPPORT
-M:	Borislav Petkov <bp@alien8.de>
-S:	Maintained
-F:	arch/x86/kernel/cpu/microcode/amd*
-
 AMD XGBE DRIVER
 M:	Tom Lendacky <thomas.lendacky@amd.com>
 L:	netdev@vger.kernel.org
@@ -5468,12 +5463,6 @@ W:	https://01.org/linux-acpi
 S:	Supported
 F:	drivers/platform/x86/intel_menlow.c
 
-INTEL IA32 MICROCODE UPDATE SUPPORT
-M:	Borislav Petkov <bp@alien8.de>
-S:	Maintained
-F:	arch/x86/kernel/cpu/microcode/core*
-F:	arch/x86/kernel/cpu/microcode/intel*
-
 INTEL I/OAT DMA DRIVER
 M:	Dave Jiang <dave.jiang@intel.com>
 R:	Dan Williams <dan.j.williams@intel.com>
@@ -11505,6 +11494,11 @@ L:	linux-edac@vger.kernel.org
 S:	Maintained
 F:	arch/x86/kernel/cpu/mcheck/*
 
+X86 MICROCODE UPDATE SUPPORT
+M:	Borislav Petkov <bp@alien8.de>
+S:	Maintained
+F:	arch/x86/kernel/cpu/microcode/*
+
 X86 VDSO
 M:	Andy Lutomirski <luto@amacapital.net>
 L:	linux-kernel@vger.kernel.org

arch/x86/Kconfig

@@ -1123,8 +1123,10 @@ config X86_REBOOTFIXUPS
 	  Say N otherwise.
 
 config MICROCODE
-	tristate "CPU microcode loading support"
+	bool "CPU microcode loading support"
+	default y
 	depends on CPU_SUP_AMD || CPU_SUP_INTEL
+	depends on BLK_DEV_INITRD
 	select FW_LOADER
 	---help---
 
@@ -1166,24 +1168,6 @@ config MICROCODE_OLD_INTERFACE
 	def_bool y
 	depends on MICROCODE
 
-config MICROCODE_INTEL_EARLY
-	bool
-
-config MICROCODE_AMD_EARLY
-	bool
-
-config MICROCODE_EARLY
-	bool "Early load microcode"
-	depends on MICROCODE=y && BLK_DEV_INITRD
-	select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
-	select MICROCODE_AMD_EARLY if MICROCODE_AMD
-	default y
-	help
-	  This option provides functionality to read additional microcode data
-	  at the beginning of initrd image. The data tells kernel to load
-	  microcode to CPU's as early as possible. No functional change if no
-	  microcode data is glued to the initrd, therefore it's safe to say Y.
-
 config X86_MSR
 	tristate "/dev/cpu/*/msr - Model-specific register support"
 	---help---

arch/x86/include/asm/amd_nb.h

@@ -81,7 +81,7 @@ static inline struct amd_northbridge *node_to_amd_nb(int node)
 	return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
 }
 
-static inline u16 amd_get_node_id(struct pci_dev *pdev)
+static inline u16 amd_pci_dev_to_node_id(struct pci_dev *pdev)
 {
 	struct pci_dev *misc;
 	int i;

arch/x86/include/asm/mce.h

@@ -123,19 +123,27 @@ struct mca_config {
 };
 
 struct mce_vendor_flags {
-			/*
-			 * overflow recovery cpuid bit indicates that overflow
-			 * conditions are not fatal
-			 */
-	__u64		overflow_recov	: 1,
-
-			/*
-			 * SUCCOR stands for S/W UnCorrectable error COntainment
-			 * and Recovery. It indicates support for data poisoning
-			 * in HW and deferred error interrupts.
-			 */
-			succor		: 1,
-			__reserved_0	: 62;
+	/*
+	 * Indicates that overflow conditions are not fatal, when set.
+	 */
+	__u64 overflow_recov	: 1,
+
+	/*
+	 * (AMD) SUCCOR stands for S/W UnCorrectable error COntainment and
+	 * Recovery. It indicates support for data poisoning in HW and deferred
+	 * error interrupts.
+	 */
+	      succor		: 1,
+
+	/*
+	 * (AMD) SMCA: This bit indicates support for Scalable MCA which expands
+	 * the register space for each MCA bank and also increases number of
+	 * banks. Also, to accommodate the new banks and registers, the MCA
+	 * register space is moved to a new MSR range.
+	 */
+	      smca		: 1,
+
+	      __reserved_0	: 61;
 };
 extern struct mce_vendor_flags mce_flags;
 

arch/x86/include/asm/microcode.h

@@ -27,7 +27,6 @@ struct cpu_signature {
 struct device;
 
 enum ucode_state { UCODE_ERROR, UCODE_OK, UCODE_NFOUND };
-extern bool dis_ucode_ldr;
 
 struct microcode_ops {
 	enum ucode_state (*request_microcode_user) (int cpu,
@@ -55,6 +54,12 @@ struct ucode_cpu_info {
 };
 extern struct ucode_cpu_info ucode_cpu_info[];
 
+#ifdef CONFIG_MICROCODE
+int __init microcode_init(void);
+#else
+static inline int __init microcode_init(void)	{ return 0; };
+#endif
+
 #ifdef CONFIG_MICROCODE_INTEL
 extern struct microcode_ops * __init init_intel_microcode(void);
 #else
@@ -75,7 +80,6 @@ static inline struct microcode_ops * __init init_amd_microcode(void)
 static inline void __exit exit_amd_microcode(void) {}
 #endif
 
-#ifdef CONFIG_MICROCODE_EARLY
 #define MAX_UCODE_COUNT 128
 
 #define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
@@ -150,22 +154,18 @@ static inline unsigned int x86_model(unsigned int sig)
 	return model;
 }
 
+#ifdef CONFIG_MICROCODE
 extern void __init load_ucode_bsp(void);
 extern void load_ucode_ap(void);
 extern int __init save_microcode_in_initrd(void);
 void reload_early_microcode(void);
 extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
 #else
-static inline void __init load_ucode_bsp(void) {}
-static inline void load_ucode_ap(void) {}
-static inline int __init save_microcode_in_initrd(void)
-{
-	return 0;
-}
-static inline void reload_early_microcode(void) {}
-static inline bool get_builtin_firmware(struct cpio_data *cd, const char *name)
-{
-	return false;
-}
+static inline void __init load_ucode_bsp(void)			{ }
+static inline void load_ucode_ap(void)				{ }
+static inline int __init save_microcode_in_initrd(void)		{ return 0; }
+static inline void reload_early_microcode(void)			{ }
+static inline bool
+get_builtin_firmware(struct cpio_data *cd, const char *name)	{ return false; }
 #endif
 #endif /* _ASM_X86_MICROCODE_H */

arch/x86/include/asm/microcode_amd.h

@@ -64,7 +64,7 @@ extern enum ucode_state load_microcode_amd(int cpu, u8 family, const u8 *data, s
 #define PATCH_MAX_SIZE PAGE_SIZE
 extern u8 amd_ucode_patch[PATCH_MAX_SIZE];
 
-#ifdef CONFIG_MICROCODE_AMD_EARLY
+#ifdef CONFIG_MICROCODE_AMD
 extern void __init load_ucode_amd_bsp(unsigned int family);
 extern void load_ucode_amd_ap(void);
 extern int __init save_microcode_in_initrd_amd(void);
@@ -76,4 +76,5 @@ static inline int __init save_microcode_in_initrd_amd(void) { return -EINVAL; }
 void reload_ucode_amd(void) {}
 #endif
 
+extern bool check_current_patch_level(u32 *rev, bool early);
 #endif /* _ASM_X86_MICROCODE_AMD_H */

arch/x86/include/asm/microcode_intel.h

@@ -57,7 +57,7 @@ extern int has_newer_microcode(void *mc, unsigned int csig, int cpf, int rev);
 extern int microcode_sanity_check(void *mc, int print_err);
 extern int find_matching_signature(void *mc, unsigned int csig, int cpf);
 
-#ifdef CONFIG_MICROCODE_INTEL_EARLY
+#ifdef CONFIG_MICROCODE_INTEL
 extern void __init load_ucode_intel_bsp(void);
 extern void load_ucode_intel_ap(void);
 extern void show_ucode_info_early(void);
@@ -71,13 +71,9 @@ static inline int __init save_microcode_in_initrd_intel(void) { return -EINVAL;
 static inline void reload_ucode_intel(void) {}
 #endif
 
-#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
+#ifdef CONFIG_HOTPLUG_CPU
 extern int save_mc_for_early(u8 *mc);
 #else
-static inline int save_mc_for_early(u8 *mc)
-{
-	return 0;
-}
+static inline int save_mc_for_early(u8 *mc) { return 0; }
 #endif
-
 #endif /* _ASM_X86_MICROCODE_INTEL_H */

arch/x86/include/uapi/asm/mce.h

@@ -2,7 +2,7 @@
 #define _UAPI_ASM_X86_MCE_H
 
 #include <linux/types.h>
-#include <asm/ioctls.h>
+#include <linux/ioctl.h>
 
 /* Fields are zero when not available */
 struct mce {

arch/x86/kernel/cpu/mcheck/mce.c

@@ -1586,6 +1586,8 @@ static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
 		winchip_mcheck_init(c);
 		return 1;
 		break;
+	default:
+		return 0;
 	}
 
 	return 0;
@@ -1605,6 +1607,8 @@ static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
 		mce_amd_feature_init(c);
 		mce_flags.overflow_recov = !!(ebx & BIT(0));
 		mce_flags.succor	 = !!(ebx & BIT(1));
+		mce_flags.smca		 = !!(ebx & BIT(3));
+
 		break;
 		}
 
@@ -2042,7 +2046,7 @@ int __init mcheck_init(void)
  * Disable machine checks on suspend and shutdown. We can't really handle
  * them later.
  */
-static int mce_disable_error_reporting(void)
+static void mce_disable_error_reporting(void)
 {
 	int i;
 
@@ -2052,17 +2056,32 @@ static int mce_disable_error_reporting(void)
 		if (b->init)
 			wrmsrl(MSR_IA32_MCx_CTL(i), 0);
 	}
-	return 0;
+	return;
+}
+
+static void vendor_disable_error_reporting(void)
+{
+	/*
+	 * Don't clear on Intel CPUs. Some of these MSRs are socket-wide.
+	 * Disabling them for just a single offlined CPU is bad, since it will
+	 * inhibit reporting for all shared resources on the socket like the
+	 * last level cache (LLC), the integrated memory controller (iMC), etc.
+	 */
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		return;
+
+	mce_disable_error_reporting();
 }
 
 static int mce_syscore_suspend(void)
 {
-	return mce_disable_error_reporting();
+	vendor_disable_error_reporting();
+	return 0;
 }
 
 static void mce_syscore_shutdown(void)
 {
-	mce_disable_error_reporting();
+	vendor_disable_error_reporting();
 }
 
 /*
@@ -2342,19 +2361,14 @@ static void mce_device_remove(unsigned int cpu)
 static void mce_disable_cpu(void *h)
 {
 	unsigned long action = *(unsigned long *)h;
-	int i;
 
 	if (!mce_available(raw_cpu_ptr(&cpu_info)))
 		return;
 
 	if (!(action & CPU_TASKS_FROZEN))
 		cmci_clear();
-	for (i = 0; i < mca_cfg.banks; i++) {
-		struct mce_bank *b = &mce_banks[i];
 
-		if (b->init)
-			wrmsrl(MSR_IA32_MCx_CTL(i), 0);
-	}
+	vendor_disable_error_reporting();
 }
 
 static void mce_reenable_cpu(void *h)

arch/x86/kernel/cpu/mcheck/therm_throt.c

@@ -503,14 +503,6 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
 		return;
 	}
 
-	/* Check whether a vector already exists */
-	if (h & APIC_VECTOR_MASK) {
-		printk(KERN_DEBUG
-		       "CPU%d: Thermal LVT vector (%#x) already installed\n",
-		       cpu, (h & APIC_VECTOR_MASK));
-		return;
-	}
-
 	/* early Pentium M models use different method for enabling TM2 */
 	if (cpu_has(c, X86_FEATURE_TM2)) {
 		if (c->x86 == 6 && (c->x86_model == 9 || c->x86_model == 13)) {

arch/x86/kernel/cpu/microcode/Makefile

@@ -2,6 +2,3 @@ microcode-y				:= core.o
 obj-$(CONFIG_MICROCODE)			+= microcode.o
 microcode-$(CONFIG_MICROCODE_INTEL)	+= intel.o intel_lib.o
 microcode-$(CONFIG_MICROCODE_AMD)	+= amd.o
-obj-$(CONFIG_MICROCODE_EARLY)		+= core_early.o
-obj-$(CONFIG_MICROCODE_INTEL_EARLY)	+= intel_early.o
-obj-$(CONFIG_MICROCODE_AMD_EARLY)	+= amd_early.o

arch/x86/kernel/cpu/microcode/amd.c

 /*
  *  AMD CPU Microcode Update Driver for Linux
+ *
+ *  This driver allows to upgrade microcode on F10h AMD
+ *  CPUs and later.
+ *
  *  Copyright (C) 2008-2011 Advanced Micro Devices Inc.
  *
  *  Author: Peter Oruba <peter.oruba@amd.com>
@@ -7,34 +11,31 @@
  *  Based on work by:
  *  Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
  *
- *  Maintainers:
- *  Andreas Herrmann <herrmann.der.user@googlemail.com>
- *  Borislav Petkov <bp@alien8.de>
+ *  early loader:
+ *  Copyright (C) 2013 Advanced Micro Devices, Inc.
  *
- *  This driver allows to upgrade microcode on F10h AMD
- *  CPUs and later.
+ *  Author: Jacob Shin <jacob.shin@amd.com>
+ *  Fixes: Borislav Petkov <bp@suse.de>
  *
  *  Licensed under the terms of the GNU General Public
  *  License version 2. See file COPYING for details.
  */
+#define pr_fmt(fmt) "microcode: " fmt
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
+#include <linux/earlycpio.h>
 #include <linux/firmware.h>
 #include <linux/uaccess.h>
 #include <linux/vmalloc.h>
+#include <linux/initrd.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/pci.h>
 
+#include <asm/microcode_amd.h>
 #include <asm/microcode.h>
 #include <asm/processor.h>
+#include <asm/setup.h>
+#include <asm/cpu.h>
 #include <asm/msr.h>
-#include <asm/microcode_amd.h>
-
-MODULE_DESCRIPTION("AMD Microcode Update Driver");
-MODULE_AUTHOR("Peter Oruba");
-MODULE_LICENSE("GPL v2");
 
 static struct equiv_cpu_entry *equiv_cpu_table;
 
@@ -47,6 +48,432 @@ struct ucode_patch {
 
 static LIST_HEAD(pcache);
 
+/*
+ * This points to the current valid container of microcode patches which we will
+ * save from the initrd before jettisoning its contents.
+ */
+static u8 *container;
+static size_t container_size;
+
+static u32 ucode_new_rev;
+u8 amd_ucode_patch[PATCH_MAX_SIZE];
+static u16 this_equiv_id;
+
+static struct cpio_data ucode_cpio;
+
+/*
+ * Microcode patch container file is prepended to the initrd in cpio format.
+ * See Documentation/x86/early-microcode.txt
+ */
+static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
+
+static struct cpio_data __init find_ucode_in_initrd(void)
+{
+	long offset = 0;
+	char *path;
+	void *start;
+	size_t size;
+
+#ifdef CONFIG_X86_32
+	struct boot_params *p;
+
+	/*
+	 * On 32-bit, early load occurs before paging is turned on so we need
+	 * to use physical addresses.
+	 */
+	p       = (struct boot_params *)__pa_nodebug(&boot_params);
+	path    = (char *)__pa_nodebug(ucode_path);
+	start   = (void *)p->hdr.ramdisk_image;
+	size    = p->hdr.ramdisk_size;
+#else
+	path    = ucode_path;
+	start   = (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET);
+	size    = boot_params.hdr.ramdisk_size;
+#endif
+
+	return find_cpio_data(path, start, size, &offset);
+}
+
+static size_t compute_container_size(u8 *data, u32 total_size)
+{
+	size_t size = 0;
+	u32 *header = (u32 *)data;
+
+	if (header[0] != UCODE_MAGIC ||
+	    header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
+	    header[2] == 0)                            /* size */
+		return size;
+
+	size = header[2] + CONTAINER_HDR_SZ;
+	total_size -= size;
+	data += size;
+
+	while (total_size) {
+		u16 patch_size;
+
+		header = (u32 *)data;
+
+		if (header[0] != UCODE_UCODE_TYPE)
+			break;
+
+		/*
+		 * Sanity-check patch size.
+		 */
+		patch_size = header[1];
+		if (patch_size > PATCH_MAX_SIZE)
+			break;
+
+		size	   += patch_size + SECTION_HDR_SIZE;
+		data	   += patch_size + SECTION_HDR_SIZE;
+		total_size -= patch_size + SECTION_HDR_SIZE;
+	}
+
+	return size;
+}
+
+/*
+ * Early load occurs before we can vmalloc(). So we look for the microcode
+ * patch container file in initrd, traverse equivalent cpu table, look for a
+ * matching microcode patch, and update, all in initrd memory in place.
+ * When vmalloc() is available for use later -- on 64-bit during first AP load,
+ * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
+ * load_microcode_amd() to save equivalent cpu table and microcode patches in
+ * kernel heap memory.
+ */
+static void apply_ucode_in_initrd(void *ucode, size_t size, bool save_patch)
+{
+	struct equiv_cpu_entry *eq;
+	size_t *cont_sz;
+	u32 *header;
+	u8  *data, **cont;
+	u8 (*patch)[PATCH_MAX_SIZE];
+	u16 eq_id = 0;
+	int offset, left;
+	u32 rev, eax, ebx, ecx, edx;
+	u32 *new_rev;
+
+#ifdef CONFIG_X86_32
+	new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
+	cont_sz = (size_t *)__pa_nodebug(&container_size);
+	cont	= (u8 **)__pa_nodebug(&container);
+	patch	= (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
+#else
+	new_rev = &ucode_new_rev;
+	cont_sz = &container_size;
+	cont	= &container;
+	patch	= &amd_ucode_patch;
+#endif
+
+	data   = ucode;
+	left   = size;
+	header = (u32 *)data;
+
+	/* find equiv cpu table */
+	if (header[0] != UCODE_MAGIC ||
+	    header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
+	    header[2] == 0)                            /* size */
+		return;
+
+	eax = 0x00000001;
+	ecx = 0;
+	native_cpuid(&eax, &ebx, &ecx, &edx);
+
+	while (left > 0) {
+		eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
+
+		*cont = data;
+
+		/* Advance past the container header */
+		offset = header[2] + CONTAINER_HDR_SZ;
+		data  += offset;
+		left  -= offset;
+
+		eq_id = find_equiv_id(eq, eax);
+		if (eq_id) {
+			this_equiv_id = eq_id;
+			*cont_sz = compute_container_size(*cont, left + offset);
+
+			/*
+			 * truncate how much we need to iterate over in the
+			 * ucode update loop below
+			 */
+			left = *cont_sz - offset;
+			break;
+		}
+
+		/*
+		 * support multiple container files appended together. if this
+		 * one does not have a matching equivalent cpu entry, we fast
+		 * forward to the next container file.
+		 */
+		while (left > 0) {
+			header = (u32 *)data;
+			if (header[0] == UCODE_MAGIC &&
+			    header[1] == UCODE_EQUIV_CPU_TABLE_TYPE)
+				break;
+
+			offset = header[1] + SECTION_HDR_SIZE;
+			data  += offset;
+			left  -= offset;
+		}
+
+		/* mark where the next microcode container file starts */
+		offset    = data - (u8 *)ucode;
+		ucode     = data;
+	}
+
+	if (!eq_id) {
+		*cont = NULL;
+		*cont_sz = 0;
+		return;
+	}
+
+	if (check_current_patch_level(&rev, true))
+		return;
+
+	while (left > 0) {
+		struct microcode_amd *mc;
+
+		header = (u32 *)data;
+		if (header[0] != UCODE_UCODE_TYPE || /* type */
+		    header[1] == 0)                  /* size */
+			break;
+
+		mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
+
+		if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id) {
+
+			if (!__apply_microcode_amd(mc)) {
+				rev = mc->hdr.patch_id;
+				*new_rev = rev;
+
+				if (save_patch)
+					memcpy(patch, mc,
+					       min_t(u32, header[1], PATCH_MAX_SIZE));
+			}
+		}
+
+		offset  = header[1] + SECTION_HDR_SIZE;
+		data   += offset;
+		left   -= offset;
+	}
+}
+
+static bool __init load_builtin_amd_microcode(struct cpio_data *cp,
+					      unsigned int family)
+{
+#ifdef CONFIG_X86_64
+	char fw_name[36] = "amd-ucode/microcode_amd.bin";
+
+	if (family >= 0x15)
+		snprintf(fw_name, sizeof(fw_name),
+			 "amd-ucode/microcode_amd_fam%.2xh.bin", family);
+
+	return get_builtin_firmware(cp, fw_name);
+#else
+	return false;
+#endif
+}
+
+void __init load_ucode_amd_bsp(unsigned int family)
+{
+	struct cpio_data cp;
+	void **data;
+	size_t *size;
+
+#ifdef CONFIG_X86_32
+	data =  (void **)__pa_nodebug(&ucode_cpio.data);
+	size = (size_t *)__pa_nodebug(&ucode_cpio.size);
+#else
+	data = &ucode_cpio.data;
+	size = &ucode_cpio.size;
+#endif
+
+	cp = find_ucode_in_initrd();
+	if (!cp.data) {
+		if (!load_builtin_amd_microcode(&cp, family))
+			return;
+	}
+
+	*data = cp.data;
+	*size = cp.size;
+
+	apply_ucode_in_initrd(cp.data, cp.size, true);
+}
+
+#ifdef CONFIG_X86_32
+/*
+ * On 32-bit, since AP's early load occurs before paging is turned on, we
+ * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
+ * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
+ * save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
+ * which is used upon resume from suspend.
+ */
+void load_ucode_amd_ap(void)
+{
+	struct microcode_amd *mc;
+	size_t *usize;
+	void **ucode;
+
+	mc = (struct microcode_amd *)__pa_nodebug(amd_ucode_patch);
+	if (mc->hdr.patch_id && mc->hdr.processor_rev_id) {
+		__apply_microcode_amd(mc);
+		return;
+	}
+
+	ucode = (void *)__pa_nodebug(&container);
+	usize = (size_t *)__pa_nodebug(&container_size);
+
+	if (!*ucode || !*usize)
+		return;
+
+	apply_ucode_in_initrd(*ucode, *usize, false);
+}
+
+static void __init collect_cpu_sig_on_bsp(void *arg)
+{
+	unsigned int cpu = smp_processor_id();
+	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+	uci->cpu_sig.sig = cpuid_eax(0x00000001);
+}
+
+static void __init get_bsp_sig(void)
+{
+	unsigned int bsp = boot_cpu_data.cpu_index;
+	struct ucode_cpu_info *uci = ucode_cpu_info + bsp;
+
+	if (!uci->cpu_sig.sig)
+		smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1);
+}
+#else
+void load_ucode_amd_ap(void)
+{
+	unsigned int cpu = smp_processor_id();
+	struct equiv_cpu_entry *eq;
+	struct microcode_amd *mc;
+	u32 rev, eax;
+	u16 eq_id;
+
+	/* Exit if called on the BSP. */
+	if (!cpu)
+		return;
+
+	if (!container)
+		return;
+
+	/*
+	 * 64-bit runs with paging enabled, thus early==false.
+	 */
+	if (check_current_patch_level(&rev, false))
+		return;
+
+	eax = cpuid_eax(0x00000001);
+	eq  = (struct equiv_cpu_entry *)(container + CONTAINER_HDR_SZ);
+
+	eq_id = find_equiv_id(eq, eax);
+	if (!eq_id)
+		return;
+
+	if (eq_id == this_equiv_id) {
+		mc = (struct microcode_amd *)amd_ucode_patch;
+
+		if (mc && rev < mc->hdr.patch_id) {
+			if (!__apply_microcode_amd(mc))
+				ucode_new_rev = mc->hdr.patch_id;
+		}
+
+	} else {
+		if (!ucode_cpio.data)
+			return;
+
+		/*
+		 * AP has a different equivalence ID than BSP, looks like
+		 * mixed-steppings silicon so go through the ucode blob anew.
+		 */
+		apply_ucode_in_initrd(ucode_cpio.data, ucode_cpio.size, false);
+	}
+}
+#endif
+
+int __init save_microcode_in_initrd_amd(void)
+{
+	unsigned long cont;
+	int retval = 0;
+	enum ucode_state ret;
+	u8 *cont_va;
+	u32 eax;
+
+	if (!container)
+		return -EINVAL;
+
+#ifdef CONFIG_X86_32
+	get_bsp_sig();
+	cont	= (unsigned long)container;
+	cont_va = __va(container);
+#else
+	/*
+	 * We need the physical address of the container for both bitness since
+	 * boot_params.hdr.ramdisk_image is a physical address.
+	 */
+	cont    = __pa(container);
+	cont_va = container;
+#endif
+
+	/*
+	 * Take into account the fact that the ramdisk might get relocated and
+	 * therefore we need to recompute the container's position in virtual
+	 * memory space.
+	 */
+	if (relocated_ramdisk)
+		container = (u8 *)(__va(relocated_ramdisk) +
+			     (cont - boot_params.hdr.ramdisk_image));
+	else
+		container = cont_va;
+
+	if (ucode_new_rev)
+		pr_info("microcode: updated early to new patch_level=0x%08x\n",
+			ucode_new_rev);
+
+	eax   = cpuid_eax(0x00000001);
+	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
+
+	ret = load_microcode_amd(smp_processor_id(), eax, container, container_size);
+	if (ret != UCODE_OK)
+		retval = -EINVAL;
+
+	/*
+	 * This will be freed any msec now, stash patches for the current
+	 * family and switch to patch cache for cpu hotplug, etc later.
+	 */
+	container = NULL;
+	container_size = 0;
+
+	return retval;
+}
+
+void reload_ucode_amd(void)
+{
+	struct microcode_amd *mc;
+	u32 rev;
+
+	/*
+	 * early==false because this is a syscore ->resume path and by
+	 * that time paging is long enabled.
+	 */
+	if (check_current_patch_level(&rev, false))
+		return;
+
+	mc = (struct microcode_amd *)amd_ucode_patch;
+
+	if (mc && rev < mc->hdr.patch_id) {
+		if (!__apply_microcode_amd(mc)) {
+			ucode_new_rev = mc->hdr.patch_id;
+			pr_info("microcode: reload patch_level=0x%08x\n",
+				ucode_new_rev);
+		}
+	}
+}
 static u16 __find_equiv_id(unsigned int cpu)
 {
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -177,6 +604,53 @@ static unsigned int verify_patch_size(u8 family, u32 patch_size,
 	return patch_size;
 }
 
+/*
+ * Those patch levels cannot be updated to newer ones and thus should be final.
+ */
+static u32 final_levels[] = {
+	0x01000098,
+	0x0100009f,
+	0x010000af,
+	0, /* T-101 terminator */
+};
+
+/*
+ * Check the current patch level on this CPU.
+ *
+ * @rev: Use it to return the patch level. It is set to 0 in the case of
+ * error.
+ *
+ * Returns:
+ *  - true: if update should stop
+ *  - false: otherwise
+ */
+bool check_current_patch_level(u32 *rev, bool early)
+{
+	u32 lvl, dummy, i;
+	bool ret = false;
+	u32 *levels;
+
+	native_rdmsr(MSR_AMD64_PATCH_LEVEL, lvl, dummy);
+
+	if (IS_ENABLED(CONFIG_X86_32) && early)
+		levels = (u32 *)__pa_nodebug(&final_levels);
+	else
+		levels = final_levels;
+
+	for (i = 0; levels[i]; i++) {
+		if (lvl == levels[i]) {
+			lvl = 0;
+			ret = true;
+			break;
+		}
+	}
+
+	if (rev)
+		*rev = lvl;
+
+	return ret;
+}
+
 int __apply_microcode_amd(struct microcode_amd *mc_amd)
 {
 	u32 rev, dummy;
@@ -197,7 +671,7 @@ int apply_microcode_amd(int cpu)
 	struct microcode_amd *mc_amd;
 	struct ucode_cpu_info *uci;
 	struct ucode_patch *p;
-	u32 rev, dummy;
+	u32 rev;
 
 	BUG_ON(raw_smp_processor_id() != cpu);
 
@@ -210,7 +684,8 @@ int apply_microcode_amd(int cpu)
 	mc_amd  = p->data;
 	uci->mc = p->data;
 
-	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
+	if (check_current_patch_level(&rev, false))
+		return -1;
 
 	/* need to apply patch? */
 	if (rev >= mc_amd->hdr.patch_id) {
@@ -387,7 +862,7 @@ enum ucode_state load_microcode_amd(int cpu, u8 family, const u8 *data, size_t s
 	if (ret != UCODE_OK)
 		cleanup();
 
-#if defined(CONFIG_MICROCODE_AMD_EARLY) && defined(CONFIG_X86_32)
+#ifdef CONFIG_X86_32
 	/* save BSP's matching patch for early load */
 	if (cpu_data(cpu).cpu_index == boot_cpu_data.cpu_index) {
 		struct ucode_patch *p = find_patch(cpu);
@@ -475,7 +950,7 @@ static struct microcode_ops microcode_amd_ops = {
 
 struct microcode_ops * __init init_amd_microcode(void)
 {
-	struct cpuinfo_x86 *c = &cpu_data(0);
+	struct cpuinfo_x86 *c = &boot_cpu_data;
 
 	if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
 		pr_warning("AMD CPU family 0x%x not supported\n", c->x86);

arch/x86/kernel/cpu/microcode/amd_early.c

-/*
- * Copyright (C) 2013 Advanced Micro Devices, Inc.
- *
- * Author: Jacob Shin <jacob.shin@amd.com>
- * Fixes: Borislav Petkov <bp@suse.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/earlycpio.h>
-#include <linux/initrd.h>
-
-#include <asm/cpu.h>
-#include <asm/setup.h>
-#include <asm/microcode_amd.h>
-
-/*
- * This points to the current valid container of microcode patches which we will
- * save from the initrd before jettisoning its contents.
- */
-static u8 *container;
-static size_t container_size;
-
-static u32 ucode_new_rev;
-u8 amd_ucode_patch[PATCH_MAX_SIZE];
-static u16 this_equiv_id;
-
-static struct cpio_data ucode_cpio;
-
-/*
- * Microcode patch container file is prepended to the initrd in cpio format.
- * See Documentation/x86/early-microcode.txt
- */
-static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
-
-static struct cpio_data __init find_ucode_in_initrd(void)
-{
-	long offset = 0;
-	char *path;
-	void *start;
-	size_t size;
-
-#ifdef CONFIG_X86_32
-	struct boot_params *p;
-
-	/*
-	 * On 32-bit, early load occurs before paging is turned on so we need
-	 * to use physical addresses.
-	 */
-	p       = (struct boot_params *)__pa_nodebug(&boot_params);
-	path    = (char *)__pa_nodebug(ucode_path);
-	start   = (void *)p->hdr.ramdisk_image;
-	size    = p->hdr.ramdisk_size;
-#else
-	path    = ucode_path;
-	start   = (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET);
-	size    = boot_params.hdr.ramdisk_size;
-#endif
-
-	return find_cpio_data(path, start, size, &offset);
-}
-
-static size_t compute_container_size(u8 *data, u32 total_size)
-{
-	size_t size = 0;
-	u32 *header = (u32 *)data;
-
-	if (header[0] != UCODE_MAGIC ||
-	    header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
-	    header[2] == 0)                            /* size */
-		return size;
-
-	size = header[2] + CONTAINER_HDR_SZ;
-	total_size -= size;
-	data += size;
-
-	while (total_size) {
-		u16 patch_size;
-
-		header = (u32 *)data;
-
-		if (header[0] != UCODE_UCODE_TYPE)
-			break;
-
-		/*
-		 * Sanity-check patch size.
-		 */
-		patch_size = header[1];
-		if (patch_size > PATCH_MAX_SIZE)
-			break;
-
-		size	   += patch_size + SECTION_HDR_SIZE;
-		data	   += patch_size + SECTION_HDR_SIZE;
-		total_size -= patch_size + SECTION_HDR_SIZE;
-	}
-
-	return size;
-}
-
-/*
- * Early load occurs before we can vmalloc(). So we look for the microcode
- * patch container file in initrd, traverse equivalent cpu table, look for a
- * matching microcode patch, and update, all in initrd memory in place.
- * When vmalloc() is available for use later -- on 64-bit during first AP load,
- * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
- * load_microcode_amd() to save equivalent cpu table and microcode patches in
- * kernel heap memory.
- */
-static void apply_ucode_in_initrd(void *ucode, size_t size, bool save_patch)
-{
-	struct equiv_cpu_entry *eq;
-	size_t *cont_sz;
-	u32 *header;
-	u8  *data, **cont;
-	u8 (*patch)[PATCH_MAX_SIZE];
-	u16 eq_id = 0;
-	int offset, left;
-	u32 rev, eax, ebx, ecx, edx;
-	u32 *new_rev;
-
-#ifdef CONFIG_X86_32
-	new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
-	cont_sz = (size_t *)__pa_nodebug(&container_size);
-	cont	= (u8 **)__pa_nodebug(&container);
-	patch	= (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
-#else
-	new_rev = &ucode_new_rev;
-	cont_sz = &container_size;
-	cont	= &container;
-	patch	= &amd_ucode_patch;
-#endif
-
-	data   = ucode;
-	left   = size;
-	header = (u32 *)data;
-
-	/* find equiv cpu table */
-	if (header[0] != UCODE_MAGIC ||
-	    header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
-	    header[2] == 0)                            /* size */
-		return;
-
-	eax = 0x00000001;
-	ecx = 0;
-	native_cpuid(&eax, &ebx, &ecx, &edx);
-
-	while (left > 0) {
-		eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
-
-		*cont = data;
-
-		/* Advance past the container header */
-		offset = header[2] + CONTAINER_HDR_SZ;
-		data  += offset;
-		left  -= offset;
-
-		eq_id = find_equiv_id(eq, eax);
-		if (eq_id) {
-			this_equiv_id = eq_id;
-			*cont_sz = compute_container_size(*cont, left + offset);
-
-			/*
-			 * truncate how much we need to iterate over in the
-			 * ucode update loop below
-			 */
-			left = *cont_sz - offset;
-			break;
-		}
-
-		/*
-		 * support multiple container files appended together. if this
-		 * one does not have a matching equivalent cpu entry, we fast
-		 * forward to the next container file.
-		 */
-		while (left > 0) {
-			header = (u32 *)data;
-			if (header[0] == UCODE_MAGIC &&
-			    header[1] == UCODE_EQUIV_CPU_TABLE_TYPE)
-				break;
-
-			offset = header[1] + SECTION_HDR_SIZE;
-			data  += offset;
-			left  -= offset;
-		}
-
-		/* mark where the next microcode container file starts */
-		offset    = data - (u8 *)ucode;
-		ucode     = data;
-	}
-
-	if (!eq_id) {
-		*cont = NULL;
-		*cont_sz = 0;
-		return;
-	}
-
-	/* find ucode and update if needed */
-
-	native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
-
-	while (left > 0) {
-		struct microcode_amd *mc;
-
-		header = (u32 *)data;
-		if (header[0] != UCODE_UCODE_TYPE || /* type */
-		    header[1] == 0)                  /* size */
-			break;
-
-		mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
-
-		if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id) {
-
-			if (!__apply_microcode_amd(mc)) {
-				rev = mc->hdr.patch_id;
-				*new_rev = rev;
-
-				if (save_patch)
-					memcpy(patch, mc,
-					       min_t(u32, header[1], PATCH_MAX_SIZE));
-			}
-		}
-
-		offset  = header[1] + SECTION_HDR_SIZE;
-		data   += offset;
-		left   -= offset;
-	}
-}
-
-static bool __init load_builtin_amd_microcode(struct cpio_data *cp,
-					      unsigned int family)
-{
-#ifdef CONFIG_X86_64
-	char fw_name[36] = "amd-ucode/microcode_amd.bin";
-
-	if (family >= 0x15)
-		snprintf(fw_name, sizeof(fw_name),
-			 "amd-ucode/microcode_amd_fam%.2xh.bin", family);
-
-	return get_builtin_firmware(cp, fw_name);
-#else
-	return false;
-#endif
-}
-
-void __init load_ucode_amd_bsp(unsigned int family)
-{
-	struct cpio_data cp;
-	void **data;
-	size_t *size;
-
-#ifdef CONFIG_X86_32
-	data =  (void **)__pa_nodebug(&ucode_cpio.data);
-	size = (size_t *)__pa_nodebug(&ucode_cpio.size);
-#else
-	data = &ucode_cpio.data;
-	size = &ucode_cpio.size;
-#endif
-
-	cp = find_ucode_in_initrd();
-	if (!cp.data) {
-		if (!load_builtin_amd_microcode(&cp, family))
-			return;
-	}
-
-	*data = cp.data;
-	*size = cp.size;
-
-	apply_ucode_in_initrd(cp.data, cp.size, true);
-}
-
-#ifdef CONFIG_X86_32
-/*
- * On 32-bit, since AP's early load occurs before paging is turned on, we
- * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
- * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
- * save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
- * which is used upon resume from suspend.
- */
-void load_ucode_amd_ap(void)
-{
-	struct microcode_amd *mc;
-	size_t *usize;
-	void **ucode;
-
-	mc = (struct microcode_amd *)__pa_nodebug(amd_ucode_patch);
-	if (mc->hdr.patch_id && mc->hdr.processor_rev_id) {
-		__apply_microcode_amd(mc);
-		return;
-	}
-
-	ucode = (void *)__pa_nodebug(&container);
-	usize = (size_t *)__pa_nodebug(&container_size);
-
-	if (!*ucode || !*usize)
-		return;
-
-	apply_ucode_in_initrd(*ucode, *usize, false);
-}
-
-static void __init collect_cpu_sig_on_bsp(void *arg)
-{
-	unsigned int cpu = smp_processor_id();
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
-	uci->cpu_sig.sig = cpuid_eax(0x00000001);
-}
-
-static void __init get_bsp_sig(void)
-{
-	unsigned int bsp = boot_cpu_data.cpu_index;
-	struct ucode_cpu_info *uci = ucode_cpu_info + bsp;
-
-	if (!uci->cpu_sig.sig)
-		smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1);
-}
-#else
-void load_ucode_amd_ap(void)
-{
-	unsigned int cpu = smp_processor_id();
-	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-	struct equiv_cpu_entry *eq;
-	struct microcode_amd *mc;
-	u32 rev, eax;
-	u16 eq_id;
-
-	/* Exit if called on the BSP. */
-	if (!cpu)
-		return;
-
-	if (!container)
-		return;
-
-	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
-
-	uci->cpu_sig.rev = rev;
-	uci->cpu_sig.sig = eax;
-
-	eax = cpuid_eax(0x00000001);
-	eq  = (struct equiv_cpu_entry *)(container + CONTAINER_HDR_SZ);
-
-	eq_id = find_equiv_id(eq, eax);
-	if (!eq_id)
-		return;
-
-	if (eq_id == this_equiv_id) {
-		mc = (struct microcode_amd *)amd_ucode_patch;
-
-		if (mc && rev < mc->hdr.patch_id) {
-			if (!__apply_microcode_amd(mc))
-				ucode_new_rev = mc->hdr.patch_id;
-		}
-
-	} else {
-		if (!ucode_cpio.data)
-			return;
-
-		/*
-		 * AP has a different equivalence ID than BSP, looks like
-		 * mixed-steppings silicon so go through the ucode blob anew.
-		 */
-		apply_ucode_in_initrd(ucode_cpio.data, ucode_cpio.size, false);
-	}
-}
-#endif
-
-int __init save_microcode_in_initrd_amd(void)
-{
-	unsigned long cont;
-	int retval = 0;
-	enum ucode_state ret;
-	u8 *cont_va;
-	u32 eax;
-
-	if (!container)
-		return -EINVAL;
-
-#ifdef CONFIG_X86_32
-	get_bsp_sig();
-	cont	= (unsigned long)container;
-	cont_va = __va(container);
-#else
-	/*
-	 * We need the physical address of the container for both bitness since
-	 * boot_params.hdr.ramdisk_image is a physical address.
-	 */
-	cont    = __pa(container);
-	cont_va = container;
-#endif
-
-	/*
-	 * Take into account the fact that the ramdisk might get relocated and
-	 * therefore we need to recompute the container's position in virtual
-	 * memory space.
-	 */
-	if (relocated_ramdisk)
-		container = (u8 *)(__va(relocated_ramdisk) +
-			     (cont - boot_params.hdr.ramdisk_image));
-	else
-		container = cont_va;
-
-	if (ucode_new_rev)
-		pr_info("microcode: updated early to new patch_level=0x%08x\n",
-			ucode_new_rev);
-
-	eax   = cpuid_eax(0x00000001);
-	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
-
-	ret = load_microcode_amd(smp_processor_id(), eax, container, container_size);
-	if (ret != UCODE_OK)
-		retval = -EINVAL;
-
-	/*
-	 * This will be freed any msec now, stash patches for the current
-	 * family and switch to patch cache for cpu hotplug, etc later.
-	 */
-	container = NULL;
-	container_size = 0;
-
-	return retval;
-}
-
-void reload_ucode_amd(void)
-{
-	struct microcode_amd *mc;
-	u32 rev, eax;
-
-	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
-
-	mc = (struct microcode_amd *)amd_ucode_patch;
-
-	if (mc && rev < mc->hdr.patch_id) {
-		if (!__apply_microcode_amd(mc)) {
-			ucode_new_rev = mc->hdr.patch_id;
-			pr_info("microcode: reload patch_level=0x%08x\n",
-				ucode_new_rev);
-		}
-	}
-}

arch/x86/kernel/cpu/microcode/core.c

@@ -5,6 +5,12 @@
  *	      2006	Shaohua Li <shaohua.li@intel.com>
  *	      2013-2015	Borislav Petkov <bp@alien8.de>
  *
+ * X86 CPU microcode early update for Linux:
+ *
+ *	Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
+ *			   H Peter Anvin" <hpa@zytor.com>
+ *		  (C) 2015 Borislav Petkov <bp@alien8.de>
+ *
  * This driver allows to upgrade microcode on x86 processors.
  *
  * This program is free software; you can redistribute it and/or
@@ -13,34 +19,39 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define pr_fmt(fmt) "microcode: " fmt
 
 #include <linux/platform_device.h>
+#include <linux/syscore_ops.h>
 #include <linux/miscdevice.h>
 #include <linux/capability.h>
+#include <linux/firmware.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/cpu.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
-#include <linux/syscore_ops.h>
 
-#include <asm/microcode.h>
-#include <asm/processor.h>
+#include <asm/microcode_intel.h>
 #include <asm/cpu_device_id.h>
+#include <asm/microcode_amd.h>
 #include <asm/perf_event.h>
+#include <asm/microcode.h>
+#include <asm/processor.h>
+#include <asm/cmdline.h>
 
-MODULE_DESCRIPTION("Microcode Update Driver");
-MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
-MODULE_LICENSE("GPL");
-
-#define MICROCODE_VERSION	"2.00"
+#define MICROCODE_VERSION	"2.01"
 
 static struct microcode_ops	*microcode_ops;
 
-bool dis_ucode_ldr;
-module_param(dis_ucode_ldr, bool, 0);
+static bool dis_ucode_ldr;
+
+static int __init disable_loader(char *str)
+{
+	dis_ucode_ldr = true;
+	return 1;
+}
+__setup("dis_ucode_ldr", disable_loader);
 
 /*
  * Synchronization.
@@ -68,6 +79,150 @@ struct cpu_info_ctx {
 	int			err;
 };
 
+static bool __init check_loader_disabled_bsp(void)
+{
+#ifdef CONFIG_X86_32
+	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
+	const char *opt	    = "dis_ucode_ldr";
+	const char *option  = (const char *)__pa_nodebug(opt);
+	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
+
+#else /* CONFIG_X86_64 */
+	const char *cmdline = boot_command_line;
+	const char *option  = "dis_ucode_ldr";
+	bool *res = &dis_ucode_ldr;
+#endif
+
+	if (cmdline_find_option_bool(cmdline, option))
+		*res = true;
+
+	return *res;
+}
+
+extern struct builtin_fw __start_builtin_fw[];
+extern struct builtin_fw __end_builtin_fw[];
+
+bool get_builtin_firmware(struct cpio_data *cd, const char *name)
+{
+#ifdef CONFIG_FW_LOADER
+	struct builtin_fw *b_fw;
+
+	for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
+		if (!strcmp(name, b_fw->name)) {
+			cd->size = b_fw->size;
+			cd->data = b_fw->data;
+			return true;
+		}
+	}
+#endif
+	return false;
+}
+
+void __init load_ucode_bsp(void)
+{
+	int vendor;
+	unsigned int family;
+
+	if (check_loader_disabled_bsp())
+		return;
+
+	if (!have_cpuid_p())
+		return;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			load_ucode_intel_bsp();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			load_ucode_amd_bsp(family);
+		break;
+	default:
+		break;
+	}
+}
+
+static bool check_loader_disabled_ap(void)
+{
+#ifdef CONFIG_X86_32
+	return *((bool *)__pa_nodebug(&dis_ucode_ldr));
+#else
+	return dis_ucode_ldr;
+#endif
+}
+
+void load_ucode_ap(void)
+{
+	int vendor, family;
+
+	if (check_loader_disabled_ap())
+		return;
+
+	if (!have_cpuid_p())
+		return;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			load_ucode_intel_ap();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			load_ucode_amd_ap();
+		break;
+	default:
+		break;
+	}
+}
+
+int __init save_microcode_in_initrd(void)
+{
+	struct cpuinfo_x86 *c = &boot_cpu_data;
+
+	switch (c->x86_vendor) {
+	case X86_VENDOR_INTEL:
+		if (c->x86 >= 6)
+			save_microcode_in_initrd_intel();
+		break;
+	case X86_VENDOR_AMD:
+		if (c->x86 >= 0x10)
+			save_microcode_in_initrd_amd();
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+void reload_early_microcode(void)
+{
+	int vendor, family;
+
+	vendor = x86_vendor();
+	family = x86_family();
+
+	switch (vendor) {
+	case X86_VENDOR_INTEL:
+		if (family >= 6)
+			reload_ucode_intel();
+		break;
+	case X86_VENDOR_AMD:
+		if (family >= 0x10)
+			reload_ucode_amd();
+		break;
+	default:
+		break;
+	}
+}
+
 static void collect_cpu_info_local(void *arg)
 {
 	struct cpu_info_ctx *ctx = arg;
@@ -210,9 +365,6 @@ static void __exit microcode_dev_exit(void)
 {
 	misc_deregister(&microcode_dev);
 }
-
-MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
-MODULE_ALIAS("devname:cpu/microcode");
 #else
 #define microcode_dev_init()	0
 #define microcode_dev_exit()	do { } while (0)
@@ -463,20 +615,6 @@ static struct notifier_block mc_cpu_notifier = {
 	.notifier_call	= mc_cpu_callback,
 };
 
-#ifdef MODULE
-/* Autoload on Intel and AMD systems */
-static const struct x86_cpu_id __initconst microcode_id[] = {
-#ifdef CONFIG_MICROCODE_INTEL
-	{ X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, },
-#endif
-#ifdef CONFIG_MICROCODE_AMD
-	{ X86_VENDOR_AMD, X86_FAMILY_ANY, X86_MODEL_ANY, },
-#endif
-	{}
-};
-MODULE_DEVICE_TABLE(x86cpu, microcode_id);
-#endif
-
 static struct attribute *cpu_root_microcode_attrs[] = {
 	&dev_attr_reload.attr,
 	NULL
@@ -487,9 +625,9 @@ static struct attribute_group cpu_root_microcode_group = {
 	.attrs = cpu_root_microcode_attrs,
 };
 
-static int __init microcode_init(void)
+int __init microcode_init(void)
 {
-	struct cpuinfo_x86 *c = &cpu_data(0);
+	struct cpuinfo_x86 *c = &boot_cpu_data;
 	int error;
 
 	if (paravirt_enabled() || dis_ucode_ldr)
@@ -560,35 +698,3 @@ static int __init microcode_init(void)
 	return error;
 
 }
-module_init(microcode_init);
-
-static void __exit microcode_exit(void)
-{
-	struct cpuinfo_x86 *c = &cpu_data(0);
-
-	microcode_dev_exit();
-
-	unregister_hotcpu_notifier(&mc_cpu_notifier);
-	unregister_syscore_ops(&mc_syscore_ops);
-
-	sysfs_remove_group(&cpu_subsys.dev_root->kobj,
-			   &cpu_root_microcode_group);
-
-	get_online_cpus();
-	mutex_lock(&microcode_mutex);
-
-	subsys_interface_unregister(&mc_cpu_interface);
-
-	mutex_unlock(&microcode_mutex);
-	put_online_cpus();
-
-	platform_device_unregister(microcode_pdev);
-
-	microcode_ops = NULL;
-
-	if (c->x86_vendor == X86_VENDOR_AMD)
-		exit_amd_microcode();
-
-	pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
-}
-module_exit(microcode_exit);

arch/x86/kernel/cpu/microcode/core_early.c

-/*
- *	X86 CPU microcode early update for Linux
- *
- *	Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
- *			   H Peter Anvin" <hpa@zytor.com>
- *		  (C) 2015 Borislav Petkov <bp@alien8.de>
- *
- *	This driver allows to early upgrade microcode on Intel processors
- *	belonging to IA-32 family - PentiumPro, Pentium II,
- *	Pentium III, Xeon, Pentium 4, etc.
- *
- *	Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
- *	Software Developer's Manual.
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; either version
- *	2 of the License, or (at your option) any later version.
- */
-#include <linux/module.h>
-#include <linux/firmware.h>
-#include <asm/microcode.h>
-#include <asm/microcode_intel.h>
-#include <asm/microcode_amd.h>
-#include <asm/processor.h>
-#include <asm/cmdline.h>
-
-static bool __init check_loader_disabled_bsp(void)
-{
-#ifdef CONFIG_X86_32
-	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
-	const char *opt	    = "dis_ucode_ldr";
-	const char *option  = (const char *)__pa_nodebug(opt);
-	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
-
-#else /* CONFIG_X86_64 */
-	const char *cmdline = boot_command_line;
-	const char *option  = "dis_ucode_ldr";
-	bool *res = &dis_ucode_ldr;
-#endif
-
-	if (cmdline_find_option_bool(cmdline, option))
-		*res = true;
-
-	return *res;
-}
-
-extern struct builtin_fw __start_builtin_fw[];
-extern struct builtin_fw __end_builtin_fw[];
-
-bool get_builtin_firmware(struct cpio_data *cd, const char *name)
-{
-#ifdef CONFIG_FW_LOADER
-	struct builtin_fw *b_fw;
-
-	for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
-		if (!strcmp(name, b_fw->name)) {
-			cd->size = b_fw->size;
-			cd->data = b_fw->data;
-			return true;
-		}
-	}
-#endif
-	return false;
-}
-
-void __init load_ucode_bsp(void)
-{
-	int vendor;
-	unsigned int family;
-
-	if (check_loader_disabled_bsp())
-		return;
-
-	if (!have_cpuid_p())
-		return;
-
-	vendor = x86_vendor();
-	family = x86_family();
-
-	switch (vendor) {
-	case X86_VENDOR_INTEL:
-		if (family >= 6)
-			load_ucode_intel_bsp();
-		break;
-	case X86_VENDOR_AMD:
-		if (family >= 0x10)
-			load_ucode_amd_bsp(family);
-		break;
-	default:
-		break;
-	}
-}
-
-static bool check_loader_disabled_ap(void)
-{
-#ifdef CONFIG_X86_32
-	return *((bool *)__pa_nodebug(&dis_ucode_ldr));
-#else
-	return dis_ucode_ldr;
-#endif
-}
-
-void load_ucode_ap(void)
-{
-	int vendor, family;
-
-	if (check_loader_disabled_ap())
-		return;
-
-	if (!have_cpuid_p())
-		return;
-
-	vendor = x86_vendor();
-	family = x86_family();
-
-	switch (vendor) {
-	case X86_VENDOR_INTEL:
-		if (family >= 6)
-			load_ucode_intel_ap();
-		break;
-	case X86_VENDOR_AMD:
-		if (family >= 0x10)
-			load_ucode_amd_ap();
-		break;
-	default:
-		break;
-	}
-}
-
-int __init save_microcode_in_initrd(void)
-{
-	struct cpuinfo_x86 *c = &boot_cpu_data;
-
-	switch (c->x86_vendor) {
-	case X86_VENDOR_INTEL:
-		if (c->x86 >= 6)
-			save_microcode_in_initrd_intel();
-		break;
-	case X86_VENDOR_AMD:
-		if (c->x86 >= 0x10)
-			save_microcode_in_initrd_amd();
-		break;
-	default:
-		break;
-	}
-
-	return 0;
-}
-
-void reload_early_microcode(void)
-{
-	int vendor, family;
-
-	vendor = x86_vendor();
-	family = x86_family();
-
-	switch (vendor) {
-	case X86_VENDOR_INTEL:
-		if (family >= 6)
-			reload_ucode_intel();
-		break;
-	case X86_VENDOR_AMD:
-		if (family >= 0x10)
-			reload_ucode_amd();
-		break;
-	default:
-		break;
-	}
-}

arch/x86/kernel/cpu/microcode/intel_early.c

-/*
- *	Intel CPU microcode early update for Linux
- *
- *	Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
- *			   H Peter Anvin" <hpa@zytor.com>
- *
- *	This allows to early upgrade microcode on Intel processors
- *	belonging to IA-32 family - PentiumPro, Pentium II,
- *	Pentium III, Xeon, Pentium 4, etc.
- *
- *	Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
- *	Software Developer's Manual.
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; either version
- *	2 of the License, or (at your option) any later version.
- */
-
-/*
- * This needs to be before all headers so that pr_debug in printk.h doesn't turn
- * printk calls into no_printk().
- *
- *#define DEBUG
- */
-
-#include <linux/module.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/earlycpio.h>
-#include <linux/initrd.h>
-#include <linux/cpu.h>
-#include <asm/msr.h>
-#include <asm/microcode_intel.h>
-#include <asm/processor.h>
-#include <asm/tlbflush.h>
-#include <asm/setup.h>
-
-#undef pr_fmt
-#define pr_fmt(fmt)	"microcode: " fmt
-
-static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
-static struct mc_saved_data {
-	unsigned int mc_saved_count;
-	struct microcode_intel **mc_saved;
-} mc_saved_data;
-
-static enum ucode_state
-load_microcode_early(struct microcode_intel **saved,
-		     unsigned int num_saved, struct ucode_cpu_info *uci)
-{
-	struct microcode_intel *ucode_ptr, *new_mc = NULL;
-	struct microcode_header_intel *mc_hdr;
-	int new_rev, ret, i;
-
-	new_rev = uci->cpu_sig.rev;
-
-	for (i = 0; i < num_saved; i++) {
-		ucode_ptr = saved[i];
-		mc_hdr	  = (struct microcode_header_intel *)ucode_ptr;
-
-		ret = has_newer_microcode(ucode_ptr,
-					  uci->cpu_sig.sig,
-					  uci->cpu_sig.pf,
-					  new_rev);
-		if (!ret)
-			continue;
-
-		new_rev = mc_hdr->rev;
-		new_mc  = ucode_ptr;
-	}
-
-	if (!new_mc)
-		return UCODE_NFOUND;
-
-	uci->mc = (struct microcode_intel *)new_mc;
-	return UCODE_OK;
-}
-
-static inline void
-copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
-		  unsigned long off, int num_saved)
-{
-	int i;
-
-	for (i = 0; i < num_saved; i++)
-		mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
-}
-
-#ifdef CONFIG_X86_32
-static void
-microcode_phys(struct microcode_intel **mc_saved_tmp,
-	       struct mc_saved_data *mc_saved_data)
-{
-	int i;
-	struct microcode_intel ***mc_saved;
-
-	mc_saved = (struct microcode_intel ***)
-		   __pa_nodebug(&mc_saved_data->mc_saved);
-	for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
-		struct microcode_intel *p;
-
-		p = *(struct microcode_intel **)
-			__pa_nodebug(mc_saved_data->mc_saved + i);
-		mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
-	}
-}
-#endif
-
-static enum ucode_state
-load_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
-	       unsigned long initrd_start, struct ucode_cpu_info *uci)
-{
-	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int count = mc_saved_data->mc_saved_count;
-
-	if (!mc_saved_data->mc_saved) {
-		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
-
-		return load_microcode_early(mc_saved_tmp, count, uci);
-	} else {
-#ifdef CONFIG_X86_32
-		microcode_phys(mc_saved_tmp, mc_saved_data);
-		return load_microcode_early(mc_saved_tmp, count, uci);
-#else
-		return load_microcode_early(mc_saved_data->mc_saved,
-						    count, uci);
-#endif
-	}
-}
-
-/*
- * Given CPU signature and a microcode patch, this function finds if the
- * microcode patch has matching family and model with the CPU.
- */
-static enum ucode_state
-matching_model_microcode(struct microcode_header_intel *mc_header,
-			unsigned long sig)
-{
-	unsigned int fam, model;
-	unsigned int fam_ucode, model_ucode;
-	struct extended_sigtable *ext_header;
-	unsigned long total_size = get_totalsize(mc_header);
-	unsigned long data_size = get_datasize(mc_header);
-	int ext_sigcount, i;
-	struct extended_signature *ext_sig;
-
-	fam   = __x86_family(sig);
-	model = x86_model(sig);
-
-	fam_ucode   = __x86_family(mc_header->sig);
-	model_ucode = x86_model(mc_header->sig);
-
-	if (fam == fam_ucode && model == model_ucode)
-		return UCODE_OK;
-
-	/* Look for ext. headers: */
-	if (total_size <= data_size + MC_HEADER_SIZE)
-		return UCODE_NFOUND;
-
-	ext_header   = (void *) mc_header + data_size + MC_HEADER_SIZE;
-	ext_sig      = (void *)ext_header + EXT_HEADER_SIZE;
-	ext_sigcount = ext_header->count;
-
-	for (i = 0; i < ext_sigcount; i++) {
-		fam_ucode   = __x86_family(ext_sig->sig);
-		model_ucode = x86_model(ext_sig->sig);
-
-		if (fam == fam_ucode && model == model_ucode)
-			return UCODE_OK;
-
-		ext_sig++;
-	}
-	return UCODE_NFOUND;
-}
-
-static int
-save_microcode(struct mc_saved_data *mc_saved_data,
-	       struct microcode_intel **mc_saved_src,
-	       unsigned int mc_saved_count)
-{
-	int i, j;
-	struct microcode_intel **saved_ptr;
-	int ret;
-
-	if (!mc_saved_count)
-		return -EINVAL;
-
-	/*
-	 * Copy new microcode data.
-	 */
-	saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL);
-	if (!saved_ptr)
-		return -ENOMEM;
-
-	for (i = 0; i < mc_saved_count; i++) {
-		struct microcode_header_intel *mc_hdr;
-		struct microcode_intel *mc;
-		unsigned long size;
-
-		if (!mc_saved_src[i]) {
-			ret = -EINVAL;
-			goto err;
-		}
-
-		mc     = mc_saved_src[i];
-		mc_hdr = &mc->hdr;
-		size   = get_totalsize(mc_hdr);
-
-		saved_ptr[i] = kmalloc(size, GFP_KERNEL);
-		if (!saved_ptr[i]) {
-			ret = -ENOMEM;
-			goto err;
-		}
-
-		memcpy(saved_ptr[i], mc, size);
-	}
-
-	/*
-	 * Point to newly saved microcode.
-	 */
-	mc_saved_data->mc_saved = saved_ptr;
-	mc_saved_data->mc_saved_count = mc_saved_count;
-
-	return 0;
-
-err:
-	for (j = 0; j <= i; j++)
-		kfree(saved_ptr[j]);
-	kfree(saved_ptr);
-
-	return ret;
-}
-
-/*
- * A microcode patch in ucode_ptr is saved into mc_saved
- * - if it has matching signature and newer revision compared to an existing
- *   patch mc_saved.
- * - or if it is a newly discovered microcode patch.
- *
- * The microcode patch should have matching model with CPU.
- *
- * Returns: The updated number @num_saved of saved microcode patches.
- */
-static unsigned int _save_mc(struct microcode_intel **mc_saved,
-			     u8 *ucode_ptr, unsigned int num_saved)
-{
-	struct microcode_header_intel *mc_hdr, *mc_saved_hdr;
-	unsigned int sig, pf;
-	int found = 0, i;
-
-	mc_hdr = (struct microcode_header_intel *)ucode_ptr;
-
-	for (i = 0; i < num_saved; i++) {
-		mc_saved_hdr = (struct microcode_header_intel *)mc_saved[i];
-		sig	     = mc_saved_hdr->sig;
-		pf	     = mc_saved_hdr->pf;
-
-		if (!find_matching_signature(ucode_ptr, sig, pf))
-			continue;
-
-		found = 1;
-
-		if (mc_hdr->rev <= mc_saved_hdr->rev)
-			continue;
-
-		/*
-		 * Found an older ucode saved earlier. Replace it with
-		 * this newer one.
-		 */
-		mc_saved[i] = (struct microcode_intel *)ucode_ptr;
-		break;
-	}
-
-	/* Newly detected microcode, save it to memory. */
-	if (i >= num_saved && !found)
-		mc_saved[num_saved++] = (struct microcode_intel *)ucode_ptr;
-
-	return num_saved;
-}
-
-/*
- * Get microcode matching with BSP's model. Only CPUs with the same model as
- * BSP can stay in the platform.
- */
-static enum ucode_state __init
-get_matching_model_microcode(int cpu, unsigned long start,
-			     void *data, size_t size,
-			     struct mc_saved_data *mc_saved_data,
-			     unsigned long *mc_saved_in_initrd,
-			     struct ucode_cpu_info *uci)
-{
-	u8 *ucode_ptr = data;
-	unsigned int leftover = size;
-	enum ucode_state state = UCODE_OK;
-	unsigned int mc_size;
-	struct microcode_header_intel *mc_header;
-	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
-	int i;
-
-	while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
-
-		if (leftover < sizeof(mc_header))
-			break;
-
-		mc_header = (struct microcode_header_intel *)ucode_ptr;
-
-		mc_size = get_totalsize(mc_header);
-		if (!mc_size || mc_size > leftover ||
-			microcode_sanity_check(ucode_ptr, 0) < 0)
-			break;
-
-		leftover -= mc_size;
-
-		/*
-		 * Since APs with same family and model as the BSP may boot in
-		 * the platform, we need to find and save microcode patches
-		 * with the same family and model as the BSP.
-		 */
-		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
-			 UCODE_OK) {
-			ucode_ptr += mc_size;
-			continue;
-		}
-
-		mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count);
-
-		ucode_ptr += mc_size;
-	}
-
-	if (leftover) {
-		state = UCODE_ERROR;
-		goto out;
-	}
-
-	if (mc_saved_count == 0) {
-		state = UCODE_NFOUND;
-		goto out;
-	}
-
-	for (i = 0; i < mc_saved_count; i++)
-		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
-
-	mc_saved_data->mc_saved_count = mc_saved_count;
-out:
-	return state;
-}
-
-static int collect_cpu_info_early(struct ucode_cpu_info *uci)
-{
-	unsigned int val[2];
-	unsigned int family, model;
-	struct cpu_signature csig;
-	unsigned int eax, ebx, ecx, edx;
-
-	csig.sig = 0;
-	csig.pf = 0;
-	csig.rev = 0;
-
-	memset(uci, 0, sizeof(*uci));
-
-	eax = 0x00000001;
-	ecx = 0;
-	native_cpuid(&eax, &ebx, &ecx, &edx);
-	csig.sig = eax;
-
-	family = __x86_family(csig.sig);
-	model  = x86_model(csig.sig);
-
-	if ((model >= 5) || (family > 6)) {
-		/* get processor flags from MSR 0x17 */
-		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
-		csig.pf = 1 << ((val[1] >> 18) & 7);
-	}
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-
-	/* As documented in the SDM: Do a CPUID 1 here */
-	sync_core();
-
-	/* get the current revision from MSR 0x8B */
-	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
-
-	csig.rev = val[1];
-
-	uci->cpu_sig = csig;
-	uci->valid = 1;
-
-	return 0;
-}
-
-#ifdef DEBUG
-static void show_saved_mc(void)
-{
-	int i, j;
-	unsigned int sig, pf, rev, total_size, data_size, date;
-	struct ucode_cpu_info uci;
-
-	if (mc_saved_data.mc_saved_count == 0) {
-		pr_debug("no microcode data saved.\n");
-		return;
-	}
-	pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
-
-	collect_cpu_info_early(&uci);
-
-	sig = uci.cpu_sig.sig;
-	pf = uci.cpu_sig.pf;
-	rev = uci.cpu_sig.rev;
-	pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
-
-	for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
-		struct microcode_header_intel *mc_saved_header;
-		struct extended_sigtable *ext_header;
-		int ext_sigcount;
-		struct extended_signature *ext_sig;
-
-		mc_saved_header = (struct microcode_header_intel *)
-				  mc_saved_data.mc_saved[i];
-		sig = mc_saved_header->sig;
-		pf = mc_saved_header->pf;
-		rev = mc_saved_header->rev;
-		total_size = get_totalsize(mc_saved_header);
-		data_size = get_datasize(mc_saved_header);
-		date = mc_saved_header->date;
-
-		pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
-			 i, sig, pf, rev, total_size,
-			 date & 0xffff,
-			 date >> 24,
-			 (date >> 16) & 0xff);
-
-		/* Look for ext. headers: */
-		if (total_size <= data_size + MC_HEADER_SIZE)
-			continue;
-
-		ext_header = (void *) mc_saved_header + data_size + MC_HEADER_SIZE;
-		ext_sigcount = ext_header->count;
-		ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
-
-		for (j = 0; j < ext_sigcount; j++) {
-			sig = ext_sig->sig;
-			pf = ext_sig->pf;
-
-			pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
-				 j, sig, pf);
-
-			ext_sig++;
-		}
-
-	}
-}
-#else
-static inline void show_saved_mc(void)
-{
-}
-#endif
-
-#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
-static DEFINE_MUTEX(x86_cpu_microcode_mutex);
-/*
- * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
- * hot added or resumes.
- *
- * Please make sure this mc should be a valid microcode patch before calling
- * this function.
- */
-int save_mc_for_early(u8 *mc)
-{
-	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count_init;
-	unsigned int mc_saved_count;
-	struct microcode_intel **mc_saved;
-	int ret = 0;
-	int i;
-
-	/*
-	 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
-	 * hotplug.
-	 */
-	mutex_lock(&x86_cpu_microcode_mutex);
-
-	mc_saved_count_init = mc_saved_data.mc_saved_count;
-	mc_saved_count = mc_saved_data.mc_saved_count;
-	mc_saved = mc_saved_data.mc_saved;
-
-	if (mc_saved && mc_saved_count)
-		memcpy(mc_saved_tmp, mc_saved,
-		       mc_saved_count * sizeof(struct microcode_intel *));
-	/*
-	 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
-	 * version.
-	 */
-	mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count);
-
-	/*
-	 * Save the mc_save_tmp in global mc_saved_data.
-	 */
-	ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
-	if (ret) {
-		pr_err("Cannot save microcode patch.\n");
-		goto out;
-	}
-
-	show_saved_mc();
-
-	/*
-	 * Free old saved microcode data.
-	 */
-	if (mc_saved) {
-		for (i = 0; i < mc_saved_count_init; i++)
-			kfree(mc_saved[i]);
-		kfree(mc_saved);
-	}
-
-out:
-	mutex_unlock(&x86_cpu_microcode_mutex);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(save_mc_for_early);
-#endif
-
-static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
-{
-#ifdef CONFIG_X86_64
-	unsigned int eax = 0x00000001, ebx, ecx = 0, edx;
-	unsigned int family, model, stepping;
-	char name[30];
-
-	native_cpuid(&eax, &ebx, &ecx, &edx);
-
-	family   = __x86_family(eax);
-	model    = x86_model(eax);
-	stepping = eax & 0xf;
-
-	sprintf(name, "intel-ucode/%02x-%02x-%02x", family, model, stepping);
-
-	return get_builtin_firmware(cp, name);
-#else
-	return false;
-#endif
-}
-
-static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
-static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
-	       unsigned long start, unsigned long size,
-	       struct ucode_cpu_info *uci)
-{
-	struct cpio_data cd;
-	long offset = 0;
-#ifdef CONFIG_X86_32
-	char *p = (char *)__pa_nodebug(ucode_name);
-#else
-	char *p = ucode_name;
-#endif
-
-	cd.data = NULL;
-	cd.size = 0;
-
-	cd = find_cpio_data(p, (void *)start, size, &offset);
-	if (!cd.data) {
-		if (!load_builtin_intel_microcode(&cd))
-			return UCODE_ERROR;
-	}
-
-	return get_matching_model_microcode(0, start, cd.data, cd.size,
-					    mc_saved_data, initrd, uci);
-}
-
-/*
- * Print ucode update info.
- */
-static void
-print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
-{
-	int cpu = smp_processor_id();
-
-	pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
-		cpu,
-		uci->cpu_sig.rev,
-		date & 0xffff,
-		date >> 24,
-		(date >> 16) & 0xff);
-}
-
-#ifdef CONFIG_X86_32
-
-static int delay_ucode_info;
-static int current_mc_date;
-
-/*
- * Print early updated ucode info after printk works. This is delayed info dump.
- */
-void show_ucode_info_early(void)
-{
-	struct ucode_cpu_info uci;
-
-	if (delay_ucode_info) {
-		collect_cpu_info_early(&uci);
-		print_ucode_info(&uci, current_mc_date);
-		delay_ucode_info = 0;
-	}
-}
-
-/*
- * At this point, we can not call printk() yet. Keep microcode patch number in
- * mc_saved_data.mc_saved and delay printing microcode info in
- * show_ucode_info_early() until printk() works.
- */
-static void print_ucode(struct ucode_cpu_info *uci)
-{
-	struct microcode_intel *mc_intel;
-	int *delay_ucode_info_p;
-	int *current_mc_date_p;
-
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
-		return;
-
-	delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
-	current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);
-
-	*delay_ucode_info_p = 1;
-	*current_mc_date_p = mc_intel->hdr.date;
-}
-#else
-
-/*
- * Flush global tlb. We only do this in x86_64 where paging has been enabled
- * already and PGE should be enabled as well.
- */
-static inline void flush_tlb_early(void)
-{
-	__native_flush_tlb_global_irq_disabled();
-}
-
-static inline void print_ucode(struct ucode_cpu_info *uci)
-{
-	struct microcode_intel *mc_intel;
-
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
-		return;
-
-	print_ucode_info(uci, mc_intel->hdr.date);
-}
-#endif
-
-static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
-{
-	struct microcode_intel *mc_intel;
-	unsigned int val[2];
-
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
-		return 0;
-
-	/* write microcode via MSR 0x79 */
-	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc_intel->bits,
-	      (unsigned long) mc_intel->bits >> 16 >> 16);
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-
-	/* As documented in the SDM: Do a CPUID 1 here */
-	sync_core();
-
-	/* get the current revision from MSR 0x8B */
-	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
-	if (val[1] != mc_intel->hdr.rev)
-		return -1;
-
-#ifdef CONFIG_X86_64
-	/* Flush global tlb. This is precaution. */
-	flush_tlb_early();
-#endif
-	uci->cpu_sig.rev = val[1];
-
-	if (early)
-		print_ucode(uci);
-	else
-		print_ucode_info(uci, mc_intel->hdr.date);
-
-	return 0;
-}
-
-/*
- * This function converts microcode patch offsets previously stored in
- * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
- */
-int __init save_microcode_in_initrd_intel(void)
-{
-	unsigned int count = mc_saved_data.mc_saved_count;
-	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
-	int ret = 0;
-
-	if (count == 0)
-		return ret;
-
-	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, initrd_start, count);
-	ret = save_microcode(&mc_saved_data, mc_saved, count);
-	if (ret)
-		pr_err("Cannot save microcode patches from initrd.\n");
-
-	show_saved_mc();
-
-	return ret;
-}
-
-static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
-		      unsigned long *initrd,
-		      unsigned long start, unsigned long size)
-{
-	struct ucode_cpu_info uci;
-	enum ucode_state ret;
-
-	collect_cpu_info_early(&uci);
-
-	ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
-	if (ret != UCODE_OK)
-		return;
-
-	ret = load_microcode(mc_saved_data, initrd, start, &uci);
-	if (ret != UCODE_OK)
-		return;
-
-	apply_microcode_early(&uci, true);
-}
-
-void __init load_ucode_intel_bsp(void)
-{
-	u64 start, size;
-#ifdef CONFIG_X86_32
-	struct boot_params *p;
-
-	p	= (struct boot_params *)__pa_nodebug(&boot_params);
-	start	= p->hdr.ramdisk_image;
-	size	= p->hdr.ramdisk_size;
-
-	_load_ucode_intel_bsp(
-			(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
-			(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
-			start, size);
-#else
-	start	= boot_params.hdr.ramdisk_image + PAGE_OFFSET;
-	size	= boot_params.hdr.ramdisk_size;
-
-	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
-#endif
-}
-
-void load_ucode_intel_ap(void)
-{
-	struct mc_saved_data *mc_saved_data_p;
-	struct ucode_cpu_info uci;
-	unsigned long *mc_saved_in_initrd_p;
-	unsigned long initrd_start_addr;
-	enum ucode_state ret;
-#ifdef CONFIG_X86_32
-	unsigned long *initrd_start_p;
-
-	mc_saved_in_initrd_p =
-		(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
-	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
-	initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
-	initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
-#else
-	mc_saved_data_p = &mc_saved_data;
-	mc_saved_in_initrd_p = mc_saved_in_initrd;
-	initrd_start_addr = initrd_start;
-#endif
-
-	/*
-	 * If there is no valid ucode previously saved in memory, no need to
-	 * update ucode on this AP.
-	 */
-	if (mc_saved_data_p->mc_saved_count == 0)
-		return;
-
-	collect_cpu_info_early(&uci);
-	ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
-			     initrd_start_addr, &uci);
-
-	if (ret != UCODE_OK)
-		return;
-
-	apply_microcode_early(&uci, true);
-}
-
-void reload_ucode_intel(void)
-{
-	struct ucode_cpu_info uci;
-	enum ucode_state ret;
-
-	if (!mc_saved_data.mc_saved_count)
-		return;
-
-	collect_cpu_info_early(&uci);
-
-	ret = load_microcode_early(mc_saved_data.mc_saved,
-				   mc_saved_data.mc_saved_count, &uci);
-	if (ret != UCODE_OK)
-		return;
-
-	apply_microcode_early(&uci, false);
-}

arch/x86/kernel/cpu/microcode/intel_lib.c

@@ -25,7 +25,6 @@
 #include <linux/firmware.h>
 #include <linux/uaccess.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 
 #include <asm/microcode_intel.h>
 #include <asm/processor.h>

arch/x86/kernel/head_32.S

@@ -152,7 +152,7 @@ ENTRY(startup_32)
 	movl %eax, pa(olpc_ofw_pgd)
 #endif
 
-#ifdef CONFIG_MICROCODE_EARLY
+#ifdef CONFIG_MICROCODE
 	/* Early load ucode on BSP. */
 	call load_ucode_bsp
 #endif
@@ -311,12 +311,11 @@ ENTRY(startup_32_smp)
 	movl %eax,%ss
 	leal -__PAGE_OFFSET(%ecx),%esp
 
-#ifdef CONFIG_MICROCODE_EARLY
+#ifdef CONFIG_MICROCODE
 	/* Early load ucode on AP. */
 	call load_ucode_ap
 #endif
 
-
 default_entry:
 #define CR0_STATE	(X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \
 			 X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \

arch/x86/kernel/setup.c

@@ -111,6 +111,7 @@
 #include <asm/mce.h>
 #include <asm/alternative.h>
 #include <asm/prom.h>
+#include <asm/microcode.h>
 
 /*
  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
@@ -480,34 +481,34 @@ static void __init memblock_x86_reserve_range_setup_data(void)
 
 #ifdef CONFIG_KEXEC_CORE
 
+/* 16M alignment for crash kernel regions */
+#define CRASH_ALIGN		(16 << 20)
+
 /*
  * Keep the crash kernel below this limit.  On 32 bits earlier kernels
  * would limit the kernel to the low 512 MiB due to mapping restrictions.
  * On 64bit, old kexec-tools need to under 896MiB.
  */
 #ifdef CONFIG_X86_32
-# define CRASH_KERNEL_ADDR_LOW_MAX	(512 << 20)
-# define CRASH_KERNEL_ADDR_HIGH_MAX	(512 << 20)
+# define CRASH_ADDR_LOW_MAX	(512 << 20)
+# define CRASH_ADDR_HIGH_MAX	(512 << 20)
 #else
-# define CRASH_KERNEL_ADDR_LOW_MAX	(896UL<<20)
-# define CRASH_KERNEL_ADDR_HIGH_MAX	MAXMEM
+# define CRASH_ADDR_LOW_MAX	(896UL << 20)
+# define CRASH_ADDR_HIGH_MAX	MAXMEM
 #endif
 
-static void __init reserve_crashkernel_low(void)
+static int __init reserve_crashkernel_low(void)
 {
 #ifdef CONFIG_X86_64
-	const unsigned long long alignment = 16<<20;	/* 16M */
-	unsigned long long low_base = 0, low_size = 0;
+	unsigned long long base, low_base = 0, low_size = 0;
 	unsigned long total_low_mem;
-	unsigned long long base;
-	bool auto_set = false;
 	int ret;
 
-	total_low_mem = memblock_mem_size(1UL<<(32-PAGE_SHIFT));
+	total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
+
 	/* crashkernel=Y,low */
-	ret = parse_crashkernel_low(boot_command_line, total_low_mem,
-						&low_size, &base);
-	if (ret != 0) {
+	ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
+	if (ret) {
 		/*
 		 * two parts from lib/swiotlb.c:
 		 * -swiotlb size: user-specified with swiotlb= or default.
@@ -517,52 +518,52 @@ static void __init reserve_crashkernel_low(void)
 		 * make sure we allocate enough extra low memory so that we
 		 * don't run out of DMA buffers for 32-bit devices.
 		 */
-		low_size = max(swiotlb_size_or_default() + (8UL<<20), 256UL<<20);
-		auto_set = true;
+		low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
 	} else {
 		/* passed with crashkernel=0,low ? */
 		if (!low_size)
-			return;
+			return 0;
 	}
 
-	low_base = memblock_find_in_range(low_size, (1ULL<<32),
-					low_size, alignment);
-
+	low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size, CRASH_ALIGN);
 	if (!low_base) {
-		if (!auto_set)
-			pr_info("crashkernel low reservation failed - No suitable area found.\n");
+		pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
+		       (unsigned long)(low_size >> 20));
+		return -ENOMEM;
+	}
 
-		return;
+	ret = memblock_reserve(low_base, low_size);
+	if (ret) {
+		pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
+		return ret;
 	}
 
-	memblock_reserve(low_base, low_size);
 	pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
-			(unsigned long)(low_size >> 20),
-			(unsigned long)(low_base >> 20),
-			(unsigned long)(total_low_mem >> 20));
+		(unsigned long)(low_size >> 20),
+		(unsigned long)(low_base >> 20),
+		(unsigned long)(total_low_mem >> 20));
+
 	crashk_low_res.start = low_base;
 	crashk_low_res.end   = low_base + low_size - 1;
 	insert_resource(&iomem_resource, &crashk_low_res);
 #endif
+	return 0;
 }
 
 static void __init reserve_crashkernel(void)
 {
-	const unsigned long long alignment = 16<<20;	/* 16M */
-	unsigned long long total_mem;
-	unsigned long long crash_size, crash_base;
+	unsigned long long crash_size, crash_base, total_mem;
 	bool high = false;
 	int ret;
 
 	total_mem = memblock_phys_mem_size();
 
 	/* crashkernel=XM */
-	ret = parse_crashkernel(boot_command_line, total_mem,
-			&crash_size, &crash_base);
+	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
 	if (ret != 0 || crash_size <= 0) {
 		/* crashkernel=X,high */
 		ret = parse_crashkernel_high(boot_command_line, total_mem,
-				&crash_size, &crash_base);
+					     &crash_size, &crash_base);
 		if (ret != 0 || crash_size <= 0)
 			return;
 		high = true;
@@ -573,11 +574,10 @@ static void __init reserve_crashkernel(void)
 		/*
 		 *  kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
 		 */
-		crash_base = memblock_find_in_range(alignment,
-					high ? CRASH_KERNEL_ADDR_HIGH_MAX :
-					       CRASH_KERNEL_ADDR_LOW_MAX,
-					crash_size, alignment);
-
+		crash_base = memblock_find_in_range(CRASH_ALIGN,
+						    high ? CRASH_ADDR_HIGH_MAX
+							 : CRASH_ADDR_LOW_MAX,
+						    crash_size, CRASH_ALIGN);
 		if (!crash_base) {
 			pr_info("crashkernel reservation failed - No suitable area found.\n");
 			return;
@@ -587,26 +587,32 @@ static void __init reserve_crashkernel(void)
 		unsigned long long start;
 
 		start = memblock_find_in_range(crash_base,
-				 crash_base + crash_size, crash_size, 1<<20);
+					       crash_base + crash_size,
+					       crash_size, 1 << 20);
 		if (start != crash_base) {
 			pr_info("crashkernel reservation failed - memory is in use.\n");
 			return;
 		}
 	}
-	memblock_reserve(crash_base, crash_size);
+	ret = memblock_reserve(crash_base, crash_size);
+	if (ret) {
+		pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
+		return;
+	}
+
+	if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
+		memblock_free(crash_base, crash_size);
+		return;
+	}
 
-	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-			"for crashkernel (System RAM: %ldMB)\n",
-			(unsigned long)(crash_size >> 20),
-			(unsigned long)(crash_base >> 20),
-			(unsigned long)(total_mem >> 20));
+	pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
+		(unsigned long)(crash_size >> 20),
+		(unsigned long)(crash_base >> 20),
+		(unsigned long)(total_mem >> 20));
 
 	crashk_res.start = crash_base;
 	crashk_res.end   = crash_base + crash_size - 1;
 	insert_resource(&iomem_resource, &crashk_res);
-
-	if (crash_base >= (1ULL<<32))
-		reserve_crashkernel_low();
 }
 #else
 static void __init reserve_crashkernel(void)
@@ -1244,6 +1250,8 @@ void __init setup_arch(char **cmdline_p)
 	if (efi_enabled(EFI_BOOT))
 		efi_apply_memmap_quirks();
 #endif
+
+	microcode_init();
 }
 
 #ifdef CONFIG_X86_32