9 files changed, 48 insertions, 50 deletions

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 0d1171c97729..b650435ffb53 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -111,6 +111,7 @@ struct cpuinfo_x86 {
         /* Index into per_cpu list: */
         u16                     cpu_index;
 #endif
+        u32                     microcode;
 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
 
 #define X86_VENDOR_INTEL        0
@@ -179,7 +180,8 @@ static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
               "=b" (*ebx),
               "=c" (*ecx),
               "=d" (*edx)
-            : "0" (*eax), "2" (*ecx));
+            : "0" (*eax), "2" (*ecx)
+            : "memory");
 }
 
 static inline void load_cr3(pgd_t *pgdir)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 13c6ec812545..46ae4f65fc7f 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -441,6 +441,8 @@ static void __cpuinit bsp_init_amd(struct cpuinfo_x86 *c)
 
 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 {
+        u32 dummy;
+
         early_init_amd_mc(c);
 
         /*
@@ -470,6 +472,8 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
                         set_cpu_cap(c, X86_FEATURE_EXTD_APICID);
         }
 #endif
+
+        rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
 }
 
 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index ed6086eedf1d..523131213f08 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -47,6 +47,15 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
                 (c->x86 == 0x6 && c->x86_model >= 0x0e))
                 set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
 
+        if (c->x86 >= 6 && !cpu_has(c, X86_FEATURE_IA64)) {
+                unsigned lower_word;
+
+                wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+                /* Required by the SDM */
+                sync_core();
+                rdmsr(MSR_IA32_UCODE_REV, lower_word, c->microcode);
+        }
+
         /*
          * Atom erratum AAE44/AAF40/AAG38/AAH41:
          *
@@ -55,17 +64,10 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
          * need the microcode to have already been loaded... so if it is
          * not, recommend a BIOS update and disable large pages.
          */
-        if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2) {
-                u32 ucode, junk;
-
-                wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-                sync_core();
-                rdmsr(MSR_IA32_UCODE_REV, junk, ucode);
-
-                if (ucode < 0x20e) {
-                        printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
-                        clear_cpu_cap(c, X86_FEATURE_PSE);
-                }
+        if (c->x86 == 6 && c->x86_model == 0x1c && c->x86_mask <= 2 &&
+            c->microcode < 0x20e) {
+                printk(KERN_WARNING "Atom PSE erratum detected, BIOS microcode update recommended\n");
+                clear_cpu_cap(c, X86_FEATURE_PSE);
         }
 
 #ifdef CONFIG_X86_64
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index fce51ad1f362..7b5063a6ad42 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -217,8 +217,13 @@ static void print_mce(struct mce *m)
                 pr_cont("MISC %llx ", m->misc);
 
         pr_cont("\n");
-        pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x\n",
-                m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid);
+        /*
+         * Note this output is parsed by external tools and old fields
+         * should not be changed.
+         */
+        pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n",
+                m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid,
+                cpu_data(m->extcpu).microcode);
 
         /*
          * Print out human-readable details about the MCE error,
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 62ac8cb6ba27..14b23140e81f 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -85,6 +85,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
                 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
         else
                 seq_printf(m, "stepping\t: unknown\n");
+        if (c->microcode)
+                seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
 
         if (cpu_has(c, X86_FEATURE_TSC)) {
                 unsigned int freq = cpufreq_quick_get(cpu);
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 591be0ee1934..d494799aafcd 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -74,14 +74,13 @@ static struct equiv_cpu_entry *equiv_cpu_table;
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
         struct cpuinfo_x86 *c = &cpu_data(cpu);
-        u32 dummy;
 
         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
                 pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
                 return -1;
         }
 
-        rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
+        csig->rev = c->microcode;
         pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
 
         return 0;
@@ -130,6 +129,7 @@ static int apply_microcode_amd(int cpu)
         int cpu_num = raw_smp_processor_id();
         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
         struct microcode_amd *mc_amd = uci->mc;
+        struct cpuinfo_x86 *c = &cpu_data(cpu);
 
         /* We should bind the task to the CPU */
         BUG_ON(cpu_num != cpu);
@@ -150,6 +150,7 @@ static int apply_microcode_amd(int cpu)
 
         pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
         uci->cpu_sig.rev = rev;
+        c->microcode = rev;
 
         return 0;
 }
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index f9242800bc84..f2d2a664e797 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -483,7 +483,13 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
                 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
                 pr_debug("CPU%d removed\n", cpu);
                 break;
-        case CPU_DEAD:
+
+        /*
+         * When a CPU goes offline, don't free up or invalidate the copy of
+         * the microcode in kernel memory, so that we can reuse it when the
+         * CPU comes back online without unnecessarily requesting the userspace
+         * for it again.
+         */
         case CPU_UP_CANCELED_FROZEN:
                 /* The CPU refused to come up during a system resume */
                 microcode_fini_cpu(cpu);
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 1a1b606d3e92..3ca42d0e43a2 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -161,12 +161,7 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
                 csig->pf = 1 << ((val[1] >> 18) & 7);
         }
 
-        wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-        /* see notes above for revision 1.07.  Apparent chip bug */
-        sync_core();
-        /* get the current revision from MSR 0x8B */
-        rdmsr(MSR_IA32_UCODE_REV, val[0], csig->rev);
-
+        csig->rev = c->microcode;
         pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
                 cpu_num, csig->sig, csig->pf, csig->rev);
 
@@ -299,9 +294,9 @@ static int apply_microcode(int cpu)
         struct microcode_intel *mc_intel;
         struct ucode_cpu_info *uci;
         unsigned int val[2];
-        int cpu_num;
+        int cpu_num = raw_smp_processor_id();
+        struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
-        cpu_num = raw_smp_processor_id();
         uci = ucode_cpu_info + cpu;
         mc_intel = uci->mc;
 
@@ -317,7 +312,7 @@ static int apply_microcode(int cpu)
               (unsigned long) mc_intel->bits >> 16 >> 16);
         wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
-        /* see notes above for revision 1.07.  Apparent chip bug */
+        /* As documented in the SDM: Do a CPUID 1 here */
         sync_core();
 
         /* get the current revision from MSR 0x8B */
@@ -335,6 +330,7 @@ static int apply_microcode(int cpu)
                 (mc_intel->hdr.date >> 16) & 0xff);
 
         uci->cpu_sig.rev = val[1];
+        c->microcode = val[1];
 
         return 0;
 }
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 932383786642..ce18c046f728 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -325,15 +325,6 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
         return adjust_tjmax(c, id, dev);
 }
 
-static void __devinit get_ucode_rev_on_cpu(void *edx)
-{
-        u32 eax;
-
-        wrmsr(MSR_IA32_UCODE_REV, 0, 0);
-        sync_core();
-        rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx);
-}
-
 static int create_name_attr(struct platform_data *pdata, struct device *dev)
 {
         sysfs_attr_init(&pdata->name_attr.attr);
@@ -380,27 +371,16 @@ exit_free:
 static int __cpuinit chk_ucode_version(unsigned int cpu)
 {
         struct cpuinfo_x86 *c = &cpu_data(cpu);
-        int err;
-        u32 edx;
 
         /*
          * Check if we have problem with errata AE18 of Core processors:
          * Readings might stop update when processor visited too deep sleep,
          * fixed for stepping D0 (6EC).
          */
-        if (c->x86_model == 0xe && c->x86_mask < 0xc) {
-                /* check for microcode update */
-                err = smp_call_function_single(cpu, get_ucode_rev_on_cpu,
-                                               &edx, 1);
-                if (err) {
-                        pr_err("Cannot determine microcode revision of "
-                               "CPU#%u (%d)!\n", cpu, err);
-                        return -ENODEV;
-                } else if (edx < 0x39) {
-                        pr_err("Errata AE18 not fixed, update BIOS or "
-                               "microcode of the CPU!\n");
-                        return -ENODEV;
-                }
+        if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) {
+                pr_err("Errata AE18 not fixed, update BIOS or "
+                       "microcode of the CPU!\n");
+                return -ENODEV;
         }
         return 0;
 }