diff options
Diffstat (limited to 'arch/x86/kernel/cpu/microcode/intel.c')
-rw-r--r-- | arch/x86/kernel/cpu/microcode/intel.c | 261 |
1 files changed, 165 insertions, 96 deletions
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 65cbbcd..cdc0dea 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -40,9 +40,13 @@ #include <asm/msr.h> /* - * Temporary microcode blobs pointers storage. We note here the pointers to - * microcode blobs we've got from whatever storage (detached initrd, builtin). - * Later on, we put those into final storage mc_saved_data.mc_saved. + * Temporary microcode blobs pointers storage. We note here during early load + * the pointers to microcode blobs we've got from whatever storage (detached + * initrd, builtin). Later on, we put those into final storage + * mc_saved_data.mc_saved. + * + * Important: those are offsets from the beginning of initrd or absolute + * addresses within the kernel image when built-in. */ static unsigned long mc_tmp_ptrs[MAX_UCODE_COUNT]; @@ -51,8 +55,15 @@ static struct mc_saved_data { struct microcode_intel **mc_saved; } mc_saved_data; +/* Microcode blobs within the initrd. 0 if builtin. */ +static struct ucode_blobs { + unsigned long start; + bool valid; +} blobs; + +/* Go through saved patches and find the one suitable for the current CPU. */ static enum ucode_state -load_microcode_early(struct microcode_intel **saved, +find_microcode_patch(struct microcode_intel **saved, unsigned int num_saved, struct ucode_cpu_info *uci) { struct microcode_intel *ucode_ptr, *new_mc = NULL; @@ -121,13 +132,13 @@ load_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs, if (!mcs->mc_saved) { copy_ptrs(mc_saved_tmp, mc_ptrs, offset, count); - return load_microcode_early(mc_saved_tmp, count, uci); + return find_microcode_patch(mc_saved_tmp, count, uci); } else { #ifdef CONFIG_X86_32 microcode_phys(mc_saved_tmp, mcs); - return load_microcode_early(mc_saved_tmp, count, uci); + return find_microcode_patch(mc_saved_tmp, count, uci); #else - return load_microcode_early(mcs->mc_saved, count, uci); + return find_microcode_patch(mcs->mc_saved, count, uci); #endif } } @@ -450,8 +461,6 @@ static void show_saved_mc(void) #endif } -#ifdef 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. @@ -459,19 +468,18 @@ static DEFINE_MUTEX(x86_cpu_microcode_mutex); * Please make sure this mc should be a valid microcode patch before calling * this function. */ -int save_mc_for_early(u8 *mc) +static void save_mc_for_early(u8 *mc) { +#ifdef CONFIG_HOTPLUG_CPU + /* Synchronization during CPU hotplug. */ + static DEFINE_MUTEX(x86_cpu_microcode_mutex); + struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT]; unsigned int mc_saved_count_init; unsigned int num_saved; struct microcode_intel **mc_saved; - int ret = 0; - int i; + int ret, 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.num_saved; @@ -509,11 +517,8 @@ int save_mc_for_early(u8 *mc) 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) { @@ -532,37 +537,6 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp) #endif } -static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin"; -static __init enum ucode_state -scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs, - 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; - - /* try built-in microcode if no initrd */ - if (!size) { - if (!load_builtin_intel_microcode(&cd)) - return UCODE_ERROR; - } else { - cd = find_cpio_data(p, (void *)start, size, &offset); - if (!cd.data) - return UCODE_ERROR; - } - - return get_matching_model_microcode(start, cd.data, cd.size, - mcs, mc_ptrs, uci); -} - /* * Print ucode update info. */ @@ -680,38 +654,117 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early) */ int __init save_microcode_in_initrd_intel(void) { - unsigned int count = mc_saved_data.num_saved; struct microcode_intel *mc_saved[MAX_UCODE_COUNT]; - int ret = 0; + unsigned int count = mc_saved_data.num_saved; + unsigned long offset = 0; + int ret; if (!count) - return ret; + return 0; + + /* + * We have found a valid initrd but it might've been relocated in the + * meantime so get its updated address. + */ + if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && blobs.valid) + offset = initrd_start; - copy_ptrs(mc_saved, mc_tmp_ptrs, get_initrd_start(), count); + copy_ptrs(mc_saved, mc_tmp_ptrs, offset, count); ret = save_microcode(&mc_saved_data, mc_saved, count); if (ret) pr_err("Cannot save microcode patches from initrd.\n"); - - show_saved_mc(); + else + show_saved_mc(); return ret; } +static __init enum ucode_state +__scan_microcode_initrd(struct cpio_data *cd, struct ucode_blobs *blbp) +{ +#ifdef CONFIG_BLK_DEV_INITRD + static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin"; + char *p = IS_ENABLED(CONFIG_X86_32) ? (char *)__pa_nodebug(ucode_name) + : ucode_name; +# ifdef CONFIG_X86_32 + unsigned long start = 0, size; + struct boot_params *params; + + params = (struct boot_params *)__pa_nodebug(&boot_params); + size = params->hdr.ramdisk_size; + + /* + * Set start only if we have an initrd image. We cannot use initrd_start + * because it is not set that early yet. + */ + start = (size ? params->hdr.ramdisk_image : 0); + +# else /* CONFIG_X86_64 */ + unsigned long start = 0, size; + + size = (u64)boot_params.ext_ramdisk_size << 32; + size |= boot_params.hdr.ramdisk_size; + + if (size) { + start = (u64)boot_params.ext_ramdisk_image << 32; + start |= boot_params.hdr.ramdisk_image; + + start += PAGE_OFFSET; + } +# endif + + *cd = find_cpio_data(p, (void *)start, size, NULL); + if (cd->data) { + blbp->start = start; + blbp->valid = true; + + return UCODE_OK; + } else +#endif /* CONFIG_BLK_DEV_INITRD */ + return UCODE_ERROR; +} + +static __init enum ucode_state +scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs, + struct ucode_cpu_info *uci, struct ucode_blobs *blbp) +{ + struct cpio_data cd = { NULL, 0, "" }; + enum ucode_state ret; + + /* try built-in microcode first */ + if (load_builtin_intel_microcode(&cd)) + /* + * Invalidate blobs as we might've gotten an initrd too, + * supplied by the boot loader, by mistake or simply forgotten + * there. That's fine, we ignore it since we've found builtin + * microcode already. + */ + blbp->valid = false; + else { + ret = __scan_microcode_initrd(&cd, blbp); + if (ret != UCODE_OK) + return ret; + } + + return get_matching_model_microcode(blbp->start, cd.data, cd.size, + mcs, mc_ptrs, uci); +} + static void __init _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs, - unsigned long start, unsigned long size) + struct ucode_blobs *blbp) { struct ucode_cpu_info uci; enum ucode_state ret; collect_cpu_info_early(&uci); - ret = scan_microcode(mcs, mc_ptrs, start, size, &uci); + ret = scan_microcode(mcs, mc_ptrs, &uci, blbp); if (ret != UCODE_OK) return; - ret = load_microcode(mcs, mc_ptrs, start, &uci); + ret = load_microcode(mcs, mc_ptrs, blbp->start, &uci); if (ret != UCODE_OK) return; @@ -720,54 +773,60 @@ _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs, 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); - size = p->hdr.ramdisk_size; + struct ucode_blobs *blobs_p; + struct mc_saved_data *mcs; + unsigned long *ptrs; - /* - * Set start only if we have an initrd image. We cannot use initrd_start - * because it is not set that early yet. - */ - start = (size ? p->hdr.ramdisk_image : 0); - - _load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data), - (unsigned long *)__pa_nodebug(&mc_tmp_ptrs), - start, size); +#ifdef CONFIG_X86_32 + mcs = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data); + ptrs = (unsigned long *)__pa_nodebug(&mc_tmp_ptrs); + blobs_p = (struct ucode_blobs *)__pa_nodebug(&blobs); #else - size = boot_params.hdr.ramdisk_size; - start = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0); - - _load_ucode_intel_bsp(&mc_saved_data, mc_tmp_ptrs, start, size); + mcs = &mc_saved_data; + ptrs = mc_tmp_ptrs; + blobs_p = &blobs; #endif + + _load_ucode_intel_bsp(mcs, ptrs, blobs_p); } void load_ucode_intel_ap(void) { - unsigned long *mcs_tmp_p; - struct mc_saved_data *mcs_p; + struct ucode_blobs *blobs_p; + unsigned long *ptrs, start = 0; + struct mc_saved_data *mcs; struct ucode_cpu_info uci; enum ucode_state ret; -#ifdef CONFIG_X86_32 - mcs_tmp_p = (unsigned long *)__pa_nodebug(mc_tmp_ptrs); - mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data); +#ifdef CONFIG_X86_32 + mcs = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data); + ptrs = (unsigned long *)__pa_nodebug(mc_tmp_ptrs); + blobs_p = (struct ucode_blobs *)__pa_nodebug(&blobs); #else - mcs_tmp_p = mc_tmp_ptrs; - mcs_p = &mc_saved_data; + mcs = &mc_saved_data; + ptrs = mc_tmp_ptrs; + blobs_p = &blobs; #endif /* * If there is no valid ucode previously saved in memory, no need to * update ucode on this AP. */ - if (!mcs_p->num_saved) + if (!mcs->num_saved) return; + if (blobs_p->valid) { + start = blobs_p->start; + + /* + * Pay attention to CONFIG_RANDOMIZE_MEMORY=y as it shuffles + * physmem mapping too and there we have the initrd. + */ + start += PAGE_OFFSET - __PAGE_OFFSET_BASE; + } + collect_cpu_info_early(&uci); - ret = load_microcode(mcs_p, mcs_tmp_p, get_initrd_start_addr(), &uci); + ret = load_microcode(mcs, ptrs, start, &uci); if (ret != UCODE_OK) return; @@ -784,7 +843,7 @@ void reload_ucode_intel(void) collect_cpu_info_early(&uci); - ret = load_microcode_early(mc_saved_data.mc_saved, + ret = find_microcode_patch(mc_saved_data.mc_saved, mc_saved_data.num_saved, &uci); if (ret != UCODE_OK) return; @@ -794,6 +853,7 @@ void reload_ucode_intel(void) static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) { + static struct cpu_signature prev; struct cpuinfo_x86 *c = &cpu_data(cpu_num); unsigned int val[2]; @@ -808,8 +868,13 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) } 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); + + /* No extra locking on prev, races are harmless. */ + if (csig->sig != prev.sig || csig->pf != prev.pf || csig->rev != prev.rev) { + pr_info("sig=0x%x, pf=0x%x, revision=0x%x\n", + csig->sig, csig->pf, csig->rev); + prev = *csig; + } return 0; } @@ -838,6 +903,7 @@ static int apply_microcode_intel(int cpu) struct ucode_cpu_info *uci; struct cpuinfo_x86 *c; unsigned int val[2]; + static int prev_rev; /* We should bind the task to the CPU */ if (WARN_ON(raw_smp_processor_id() != cpu)) @@ -872,11 +938,14 @@ static int apply_microcode_intel(int cpu) return -1; } - pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n", - cpu, val[1], - mc->hdr.date & 0xffff, - mc->hdr.date >> 24, - (mc->hdr.date >> 16) & 0xff); + if (val[1] != prev_rev) { + pr_info("updated to revision 0x%x, date = %04x-%02x-%02x\n", + val[1], + mc->hdr.date & 0xffff, + mc->hdr.date >> 24, + (mc->hdr.date >> 16) & 0xff); + prev_rev = val[1]; + } c = &cpu_data(cpu); |