diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/io.h | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/tlbflush.h | 21 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/intel_cacheinfo.c | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/microcode/intel.c | 19 | ||||
| -rw-r--r-- | arch/x86/kernel/head32.c | 5 | ||||
| -rw-r--r-- | arch/x86/mm/mmap.c | 12 | ||||
| -rw-r--r-- | arch/x86/mm/tlb.c | 64 |
7 files changed, 59 insertions, 67 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index c40a95c33bb8..322d25ae23ab 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -110,6 +110,10 @@ build_mmio_write(__writeq, "q", unsigned long, "r", ) #endif +#define ARCH_HAS_VALID_PHYS_ADDR_RANGE +extern int valid_phys_addr_range(phys_addr_t addr, size_t size); +extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); + /** * virt_to_phys - map virtual addresses to physical * @address: address to remap diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h index d362161d3291..c4aed0de565e 100644 --- a/arch/x86/include/asm/tlbflush.h +++ b/arch/x86/include/asm/tlbflush.h @@ -82,12 +82,21 @@ static inline u64 inc_mm_tlb_gen(struct mm_struct *mm) #define __flush_tlb_single(addr) __native_flush_tlb_single(addr) #endif -/* - * If tlb_use_lazy_mode is true, then we try to avoid switching CR3 to point - * to init_mm when we switch to a kernel thread (e.g. the idle thread). If - * it's false, then we immediately switch CR3 when entering a kernel thread. - */ -DECLARE_STATIC_KEY_TRUE(tlb_use_lazy_mode); +static inline bool tlb_defer_switch_to_init_mm(void) +{ + /* + * If we have PCID, then switching to init_mm is reasonably + * fast. If we don't have PCID, then switching to init_mm is + * quite slow, so we try to defer it in the hopes that we can + * avoid it entirely. The latter approach runs the risk of + * receiving otherwise unnecessary IPIs. + * + * This choice is just a heuristic. The tlb code can handle this + * function returning true or false regardless of whether we have + * PCID. + */ + return !static_cpu_has(X86_FEATURE_PCID); +} /* * 6 because 6 should be plenty and struct tlb_state will fit in diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c index 24f749324c0f..9990a71e311f 100644 --- a/arch/x86/kernel/cpu/intel_cacheinfo.c +++ b/arch/x86/kernel/cpu/intel_cacheinfo.c @@ -831,7 +831,6 @@ static int __cache_amd_cpumap_setup(unsigned int cpu, int index, } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) { unsigned int apicid, nshared, first, last; - this_leaf = this_cpu_ci->info_list + index; nshared = base->eax.split.num_threads_sharing + 1; apicid = cpu_data(cpu).apicid; first = apicid - (apicid % nshared); diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index 8f7a9bbad514..7dbcb7adf797 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -34,6 +34,7 @@ #include <linux/mm.h> #include <asm/microcode_intel.h> +#include <asm/intel-family.h> #include <asm/processor.h> #include <asm/tlbflush.h> #include <asm/setup.h> @@ -918,6 +919,18 @@ static int get_ucode_fw(void *to, const void *from, size_t n) return 0; } +static bool is_blacklisted(unsigned int cpu) +{ + struct cpuinfo_x86 *c = &cpu_data(cpu); + + if (c->x86 == 6 && c->x86_model == INTEL_FAM6_BROADWELL_X) { + pr_err_once("late loading on model 79 is disabled.\n"); + return true; + } + + return false; +} + static enum ucode_state request_microcode_fw(int cpu, struct device *device, bool refresh_fw) { @@ -926,6 +939,9 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device, const struct firmware *firmware; enum ucode_state ret; + if (is_blacklisted(cpu)) + return UCODE_NFOUND; + sprintf(name, "intel-ucode/%02x-%02x-%02x", c->x86, c->x86_model, c->x86_mask); @@ -950,6 +966,9 @@ static int get_ucode_user(void *to, const void *from, size_t n) static enum ucode_state request_microcode_user(int cpu, const void __user *buf, size_t size) { + if (is_blacklisted(cpu)) + return UCODE_NFOUND; + return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user); } diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c index cf2ce063f65a..2902ca4d5993 100644 --- a/arch/x86/kernel/head32.c +++ b/arch/x86/kernel/head32.c @@ -30,10 +30,11 @@ static void __init i386_default_early_setup(void) asmlinkage __visible void __init i386_start_kernel(void) { - cr4_init_shadow(); - + /* Make sure IDT is set up before any exception happens */ idt_setup_early_handler(); + cr4_init_shadow(); + sanitize_boot_params(&boot_params); x86_early_init_platform_quirks(); diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c index a99679826846..320c6237e1d1 100644 --- a/arch/x86/mm/mmap.c +++ b/arch/x86/mm/mmap.c @@ -174,3 +174,15 @@ const char *arch_vma_name(struct vm_area_struct *vma) return "[mpx]"; return NULL; } + +int valid_phys_addr_range(phys_addr_t addr, size_t count) +{ + return addr + count <= __pa(high_memory); +} + +int valid_mmap_phys_addr_range(unsigned long pfn, size_t count) +{ + phys_addr_t addr = (phys_addr_t)pfn << PAGE_SHIFT; + + return valid_phys_addr_range(addr, count); +} diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 658bf0090565..0f3d0cea4d00 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -30,7 +30,6 @@ atomic64_t last_mm_ctx_id = ATOMIC64_INIT(1); -DEFINE_STATIC_KEY_TRUE(tlb_use_lazy_mode); static void choose_new_asid(struct mm_struct *next, u64 next_tlb_gen, u16 *new_asid, bool *need_flush) @@ -147,8 +146,8 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, this_cpu_write(cpu_tlbstate.is_lazy, false); if (real_prev == next) { - VM_BUG_ON(this_cpu_read(cpu_tlbstate.ctxs[prev_asid].ctx_id) != - next->context.ctx_id); + VM_WARN_ON(this_cpu_read(cpu_tlbstate.ctxs[prev_asid].ctx_id) != + next->context.ctx_id); /* * We don't currently support having a real mm loaded without @@ -213,6 +212,9 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, } /* + * Please ignore the name of this function. It should be called + * switch_to_kernel_thread(). + * * enter_lazy_tlb() is a hint from the scheduler that we are entering a * kernel thread or other context without an mm. Acceptable implementations * include doing nothing whatsoever, switching to init_mm, or various clever @@ -227,7 +229,7 @@ void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) if (this_cpu_read(cpu_tlbstate.loaded_mm) == &init_mm) return; - if (static_branch_unlikely(&tlb_use_lazy_mode)) { + if (tlb_defer_switch_to_init_mm()) { /* * There's a significant optimization that may be possible * here. We have accurate enough TLB flush tracking that we @@ -626,57 +628,3 @@ static int __init create_tlb_single_page_flush_ceiling(void) return 0; } late_initcall(create_tlb_single_page_flush_ceiling); - -static ssize_t tlblazy_read_file(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - char buf[2]; - - buf[0] = static_branch_likely(&tlb_use_lazy_mode) ? '1' : '0'; - buf[1] = '\n'; - - return simple_read_from_buffer(user_buf, count, ppos, buf, 2); -} - -static ssize_t tlblazy_write_file(struct file *file, - const char __user *user_buf, size_t count, loff_t *ppos) -{ - bool val; - - if (kstrtobool_from_user(user_buf, count, &val)) - return -EINVAL; - - if (val) - static_branch_enable(&tlb_use_lazy_mode); - else - static_branch_disable(&tlb_use_lazy_mode); - - return count; -} - -static const struct file_operations fops_tlblazy = { - .read = tlblazy_read_file, - .write = tlblazy_write_file, - .llseek = default_llseek, -}; - -static int __init init_tlb_use_lazy_mode(void) -{ - if (boot_cpu_has(X86_FEATURE_PCID)) { - /* - * Heuristic: with PCID on, switching to and from - * init_mm is reasonably fast, but remote flush IPIs - * as expensive as ever, so turn off lazy TLB mode. - * - * We can't do this in setup_pcid() because static keys - * haven't been initialized yet, and it would blow up - * badly. - */ - static_branch_disable(&tlb_use_lazy_mode); - } - - debugfs_create_file("tlb_use_lazy_mode", S_IRUSR | S_IWUSR, - arch_debugfs_dir, NULL, &fops_tlblazy); - return 0; -} -late_initcall(init_tlb_use_lazy_mode); |