diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/boot/compressed/acpi.c | 143 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/head_64.S | 1 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc.c | 11 | ||||
| -rw-r--r-- | arch/x86/boot/header.S | 12 | ||||
| -rw-r--r-- | arch/x86/include/uapi/asm/bootparam.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/kexec-bzimage64.c | 5 | ||||
| -rw-r--r-- | arch/x86/kernel/machine_kexec_64.c | 87 | ||||
| -rw-r--r-- | arch/x86/kernel/setup.c | 15 |
8 files changed, 233 insertions, 43 deletions
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index ad84239e595e..15255f388a85 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -44,17 +44,109 @@ static acpi_physical_address get_acpi_rsdp(void) return addr; } -/* Search EFI system tables for RSDP. */ -static acpi_physical_address efi_get_rsdp_addr(void) +/* + * Search EFI system tables for RSDP. If both ACPI_20_TABLE_GUID and + * ACPI_TABLE_GUID are found, take the former, which has more features. + */ +static acpi_physical_address +__efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables, + bool efi_64) { acpi_physical_address rsdp_addr = 0; #ifdef CONFIG_EFI - unsigned long systab, systab_tables, config_tables; + int i; + + /* Get EFI tables from systab. */ + for (i = 0; i < nr_tables; i++) { + acpi_physical_address table; + efi_guid_t guid; + + if (efi_64) { + efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i; + + guid = tbl->guid; + table = tbl->table; + + if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { + debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); + return 0; + } + } else { + efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i; + + guid = tbl->guid; + table = tbl->table; + } + + if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) + rsdp_addr = table; + else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) + return table; + } +#endif + return rsdp_addr; +} + +/* EFI/kexec support is 64-bit only. */ +#ifdef CONFIG_X86_64 +static struct efi_setup_data *get_kexec_setup_data_addr(void) +{ + struct setup_data *data; + u64 pa_data; + + pa_data = boot_params->hdr.setup_data; + while (pa_data) { + data = (struct setup_data *)pa_data; + if (data->type == SETUP_EFI) + return (struct efi_setup_data *)(pa_data + sizeof(struct setup_data)); + + pa_data = data->next; + } + return NULL; +} + +static acpi_physical_address kexec_get_rsdp_addr(void) +{ + efi_system_table_64_t *systab; + struct efi_setup_data *esd; + struct efi_info *ei; + char *sig; + + esd = (struct efi_setup_data *)get_kexec_setup_data_addr(); + if (!esd) + return 0; + + if (!esd->tables) { + debug_putstr("Wrong kexec SETUP_EFI data.\n"); + return 0; + } + + ei = &boot_params->efi_info; + sig = (char *)&ei->efi_loader_signature; + if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) { + debug_putstr("Wrong kexec EFI loader signature.\n"); + return 0; + } + + /* Get systab from boot params. */ + systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32)); + if (!systab) + error("EFI system table not found in kexec boot_params."); + + return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true); +} +#else +static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; } +#endif /* CONFIG_X86_64 */ + +static acpi_physical_address efi_get_rsdp_addr(void) +{ +#ifdef CONFIG_EFI + unsigned long systab, config_tables; unsigned int nr_tables; struct efi_info *ei; bool efi_64; - int size, i; char *sig; ei = &boot_params->efi_info; @@ -88,49 +180,20 @@ static acpi_physical_address efi_get_rsdp_addr(void) config_tables = stbl->tables; nr_tables = stbl->nr_tables; - size = sizeof(efi_config_table_64_t); } else { efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab; config_tables = stbl->tables; nr_tables = stbl->nr_tables; - size = sizeof(efi_config_table_32_t); } if (!config_tables) error("EFI config tables not found."); - /* Get EFI tables from systab. */ - for (i = 0; i < nr_tables; i++) { - acpi_physical_address table; - efi_guid_t guid; - - config_tables += size; - - if (efi_64) { - efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables; - - guid = tbl->guid; - table = tbl->table; - - if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { - debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); - return 0; - } - } else { - efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables; - - guid = tbl->guid; - table = tbl->table; - } - - if (!(efi_guidcmp(guid, ACPI_TABLE_GUID))) - rsdp_addr = table; - else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID))) - return table; - } + return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64); +#else + return 0; #endif - return rsdp_addr; } static u8 compute_checksum(u8 *buffer, u32 length) @@ -220,6 +283,14 @@ acpi_physical_address get_rsdp_addr(void) if (!pa) pa = boot_params->acpi_rsdp_addr; + /* + * Try to get EFI data from setup_data. This can happen when we're a + * kexec'ed kernel and kexec(1) has passed all the required EFI info to + * us. + */ + if (!pa) + pa = kexec_get_rsdp_addr(); + if (!pa) pa = efi_get_rsdp_addr(); diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index fafb75c6c592..6233ae35d0d9 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -659,6 +659,7 @@ no_longmode: gdt64: .word gdt_end - gdt .quad 0 + .balign 8 gdt: .word gdt_end - gdt .long gdt diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 5a237e8dbf8d..24e65a0f756d 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -351,9 +351,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, /* Clear flags intended for solely in-kernel use. */ boot_params->hdr.loadflags &= ~KASLR_FLAG; - /* Save RSDP address for later use. */ - /* boot_params->acpi_rsdp_addr = get_rsdp_addr(); */ - sanitize_boot_params(boot_params); if (boot_params->screen_info.orig_video_mode == 7) { @@ -368,6 +365,14 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, cols = boot_params->screen_info.orig_video_cols; console_init(); + + /* + * Save RSDP address for later use. Have this after console_init() + * so that early debugging output from the RSDP parsing code can be + * collected. + */ + boot_params->acpi_rsdp_addr = get_rsdp_addr(); + debug_putstr("early console in extract_kernel\n"); free_mem_ptr = heap; /* Heap */ diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S index 850b8762e889..be19f4199727 100644 --- a/arch/x86/boot/header.S +++ b/arch/x86/boot/header.S @@ -419,7 +419,17 @@ xloadflags: # define XLF4 0 #endif - .word XLF0 | XLF1 | XLF23 | XLF4 +#ifdef CONFIG_X86_64 +#ifdef CONFIG_X86_5LEVEL +#define XLF56 (XLF_5LEVEL|XLF_5LEVEL_ENABLED) +#else +#define XLF56 XLF_5LEVEL +#endif +#else +#define XLF56 0 +#endif + + .word XLF0 | XLF1 | XLF23 | XLF4 | XLF56 cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line, #added with boot protocol diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h index 60733f137e9a..c895df5482c5 100644 --- a/arch/x86/include/uapi/asm/bootparam.h +++ b/arch/x86/include/uapi/asm/bootparam.h @@ -29,6 +29,8 @@ #define XLF_EFI_HANDOVER_32 (1<<2) #define XLF_EFI_HANDOVER_64 (1<<3) #define XLF_EFI_KEXEC (1<<4) +#define XLF_5LEVEL (1<<5) +#define XLF_5LEVEL_ENABLED (1<<6) #ifndef __ASSEMBLY__ diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c index f03237e3f192..347fc0be76b2 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -319,6 +319,11 @@ static int bzImage64_probe(const char *buf, unsigned long len) return ret; } + if (!(header->xloadflags & XLF_5LEVEL) && pgtable_l5_enabled()) { + pr_err("bzImage cannot handle 5-level paging mode.\n"); + return ret; + } + /* I've got a bzImage */ pr_debug("It's a relocatable bzImage64\n"); ret = 0; diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index d7be2376ac0b..9184037aec62 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -16,6 +16,7 @@ #include <linux/io.h> #include <linux/suspend.h> #include <linux/vmalloc.h> +#include <linux/efi.h> #include <asm/init.h> #include <asm/pgtable.h> @@ -27,6 +28,55 @@ #include <asm/setup.h> #include <asm/set_memory.h> +#ifdef CONFIG_ACPI +/* + * Used while adding mapping for ACPI tables. + * Can be reused when other iomem regions need be mapped + */ +struct init_pgtable_data { + struct x86_mapping_info *info; + pgd_t *level4p; +}; + +static int mem_region_callback(struct resource *res, void *arg) +{ + struct init_pgtable_data *data = arg; + unsigned long mstart, mend; + + mstart = res->start; + mend = mstart + resource_size(res) - 1; + + return kernel_ident_mapping_init(data->info, data->level4p, mstart, mend); +} + +static int +map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p) +{ + struct init_pgtable_data data; + unsigned long flags; + int ret; + + data.info = info; + data.level4p = level4p; + flags = IORESOURCE_MEM | IORESOURCE_BUSY; + + ret = walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1, + &data, mem_region_callback); + if (ret && ret != -EINVAL) + return ret; + + /* ACPI tables could be located in ACPI Non-volatile Storage region */ + ret = walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, + &data, mem_region_callback); + if (ret && ret != -EINVAL) + return ret; + + return 0; +} +#else +static int map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p) { return 0; } +#endif + #ifdef CONFIG_KEXEC_FILE const struct kexec_file_ops * const kexec_file_loaders[] = { &kexec_bzImage64_ops, @@ -34,6 +84,31 @@ const struct kexec_file_ops * const kexec_file_loaders[] = { }; #endif +static int +map_efi_systab(struct x86_mapping_info *info, pgd_t *level4p) +{ +#ifdef CONFIG_EFI + unsigned long mstart, mend; + + if (!efi_enabled(EFI_BOOT)) + return 0; + + mstart = (boot_params.efi_info.efi_systab | + ((u64)boot_params.efi_info.efi_systab_hi<<32)); + + if (efi_enabled(EFI_64BIT)) + mend = mstart + sizeof(efi_system_table_64_t); + else + mend = mstart + sizeof(efi_system_table_32_t); + + if (!mstart) + return 0; + + return kernel_ident_mapping_init(info, level4p, mstart, mend); +#endif + return 0; +} + static void free_transition_pgtable(struct kimage *image) { free_page((unsigned long)image->arch.p4d); @@ -157,6 +232,18 @@ static int init_pgtable(struct kimage *image, unsigned long start_pgtable) return result; } + /* + * Prepare EFI systab and ACPI tables for kexec kernel since they are + * not covered by pfn_mapped. + */ + result = map_efi_systab(&info, level4p); + if (result) + return result; + + result = map_acpi_tables(&info, level4p); + if (result) + return result; + return init_transition_pgtable(image, level4p); } diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 08a5f4a131f5..dcbdf54fb5c1 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -453,15 +453,24 @@ static void __init memblock_x86_reserve_range_setup_data(void) #define CRASH_ALIGN SZ_16M /* - * 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. + * 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, kdump kernel need be restricted to be under 64TB, which is + * the upper limit of system RAM in 4-level paing mode. Since the kdump + * jumping could be from 5-level to 4-level, the jumping will fail if + * kernel is put above 64TB, and there's no way to detect the paging mode + * of the kernel which will be loaded for dumping during the 1st kernel + * bootup. */ #ifdef CONFIG_X86_32 # define CRASH_ADDR_LOW_MAX SZ_512M # define CRASH_ADDR_HIGH_MAX SZ_512M #else # define CRASH_ADDR_LOW_MAX SZ_4G -# define CRASH_ADDR_HIGH_MAX MAXMEM +# define CRASH_ADDR_HIGH_MAX SZ_64T #endif static int __init reserve_crashkernel_low(void) |