Commit | Line | Data |
---|---|---|
5234f5eb | 1 | /* |
835c34a1 | 2 | * handle transition of Linux booting another kernel |
5234f5eb EB |
3 | * Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com> |
4 | * | |
5 | * This source code is licensed under the GNU General Public License, | |
6 | * Version 2. See the file COPYING for more details. | |
7 | */ | |
8 | ||
12db5562 VG |
9 | #define pr_fmt(fmt) "kexec: " fmt |
10 | ||
5234f5eb EB |
11 | #include <linux/mm.h> |
12 | #include <linux/kexec.h> | |
5234f5eb | 13 | #include <linux/string.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
5234f5eb | 15 | #include <linux/reboot.h> |
fd59d231 | 16 | #include <linux/numa.h> |
f43fdad8 | 17 | #include <linux/ftrace.h> |
fef3a7a1 | 18 | #include <linux/io.h> |
fee7b0d8 | 19 | #include <linux/suspend.h> |
d6472302 | 20 | #include <linux/vmalloc.h> |
f43fdad8 | 21 | |
9ebdc79f | 22 | #include <asm/init.h> |
5234f5eb | 23 | #include <asm/pgtable.h> |
5234f5eb EB |
24 | #include <asm/tlbflush.h> |
25 | #include <asm/mmu_context.h> | |
8643e28d | 26 | #include <asm/io_apic.h> |
17f557e5 | 27 | #include <asm/debugreg.h> |
27f48d3e | 28 | #include <asm/kexec-bzimage64.h> |
4545c898 | 29 | #include <asm/setup.h> |
d1163651 | 30 | #include <asm/set_memory.h> |
8bf27556 | 31 | |
74ca317c | 32 | #ifdef CONFIG_KEXEC_FILE |
9ec4ecef | 33 | const struct kexec_file_ops * const kexec_file_loaders[] = { |
27f48d3e | 34 | &kexec_bzImage64_ops, |
9ec4ecef | 35 | NULL |
cb105258 | 36 | }; |
74ca317c | 37 | #endif |
cb105258 | 38 | |
f5deb796 HY |
39 | static void free_transition_pgtable(struct kimage *image) |
40 | { | |
7f689041 | 41 | free_page((unsigned long)image->arch.p4d); |
a466ef76 | 42 | image->arch.p4d = NULL; |
f5deb796 | 43 | free_page((unsigned long)image->arch.pud); |
a466ef76 | 44 | image->arch.pud = NULL; |
f5deb796 | 45 | free_page((unsigned long)image->arch.pmd); |
a466ef76 | 46 | image->arch.pmd = NULL; |
f5deb796 | 47 | free_page((unsigned long)image->arch.pte); |
a466ef76 | 48 | image->arch.pte = NULL; |
f5deb796 HY |
49 | } |
50 | ||
51 | static int init_transition_pgtable(struct kimage *image, pgd_t *pgd) | |
52 | { | |
7f689041 | 53 | p4d_t *p4d; |
f5deb796 HY |
54 | pud_t *pud; |
55 | pmd_t *pmd; | |
56 | pte_t *pte; | |
57 | unsigned long vaddr, paddr; | |
58 | int result = -ENOMEM; | |
59 | ||
60 | vaddr = (unsigned long)relocate_kernel; | |
61 | paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE); | |
62 | pgd += pgd_index(vaddr); | |
63 | if (!pgd_present(*pgd)) { | |
7f689041 KS |
64 | p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL); |
65 | if (!p4d) | |
66 | goto err; | |
67 | image->arch.p4d = p4d; | |
68 | set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE)); | |
69 | } | |
70 | p4d = p4d_offset(pgd, vaddr); | |
71 | if (!p4d_present(*p4d)) { | |
f5deb796 HY |
72 | pud = (pud_t *)get_zeroed_page(GFP_KERNEL); |
73 | if (!pud) | |
74 | goto err; | |
75 | image->arch.pud = pud; | |
7f689041 | 76 | set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE)); |
f5deb796 | 77 | } |
7f689041 | 78 | pud = pud_offset(p4d, vaddr); |
f5deb796 HY |
79 | if (!pud_present(*pud)) { |
80 | pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL); | |
81 | if (!pmd) | |
82 | goto err; | |
83 | image->arch.pmd = pmd; | |
84 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
85 | } | |
86 | pmd = pmd_offset(pud, vaddr); | |
87 | if (!pmd_present(*pmd)) { | |
88 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL); | |
89 | if (!pte) | |
90 | goto err; | |
91 | image->arch.pte = pte; | |
92 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); | |
93 | } | |
94 | pte = pte_offset_kernel(pmd, vaddr); | |
bba4ed01 | 95 | set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC_NOENC)); |
f5deb796 HY |
96 | return 0; |
97 | err: | |
f5deb796 HY |
98 | return result; |
99 | } | |
100 | ||
9ebdc79f YL |
101 | static void *alloc_pgt_page(void *data) |
102 | { | |
103 | struct kimage *image = (struct kimage *)data; | |
104 | struct page *page; | |
105 | void *p = NULL; | |
106 | ||
107 | page = kimage_alloc_control_pages(image, 0); | |
108 | if (page) { | |
109 | p = page_address(page); | |
110 | clear_page(p); | |
111 | } | |
112 | ||
113 | return p; | |
114 | } | |
115 | ||
5234f5eb EB |
116 | static int init_pgtable(struct kimage *image, unsigned long start_pgtable) |
117 | { | |
9ebdc79f YL |
118 | struct x86_mapping_info info = { |
119 | .alloc_pgt_page = alloc_pgt_page, | |
120 | .context = image, | |
66aad4fd | 121 | .page_flag = __PAGE_KERNEL_LARGE_EXEC, |
bba4ed01 | 122 | .kernpg_flag = _KERNPG_TABLE_NOENC, |
9ebdc79f | 123 | }; |
084d1283 | 124 | unsigned long mstart, mend; |
8bf27556 | 125 | pgd_t *level4p; |
f5deb796 | 126 | int result; |
084d1283 YL |
127 | int i; |
128 | ||
8bf27556 | 129 | level4p = (pgd_t *)__va(start_pgtable); |
9ebdc79f | 130 | clear_page(level4p); |
8638100c XP |
131 | |
132 | if (direct_gbpages) | |
133 | info.direct_gbpages = true; | |
134 | ||
0e691cf8 YL |
135 | for (i = 0; i < nr_pfn_mapped; i++) { |
136 | mstart = pfn_mapped[i].start << PAGE_SHIFT; | |
137 | mend = pfn_mapped[i].end << PAGE_SHIFT; | |
138 | ||
139 | result = kernel_ident_mapping_init(&info, | |
140 | level4p, mstart, mend); | |
141 | if (result) | |
142 | return result; | |
143 | } | |
084d1283 | 144 | |
53594547 | 145 | /* |
084d1283 YL |
146 | * segments's mem ranges could be outside 0 ~ max_pfn, |
147 | * for example when jump back to original kernel from kexeced kernel. | |
148 | * or first kernel is booted with user mem map, and second kernel | |
149 | * could be loaded out of that range. | |
53594547 | 150 | */ |
084d1283 YL |
151 | for (i = 0; i < image->nr_segments; i++) { |
152 | mstart = image->segment[i].mem; | |
153 | mend = mstart + image->segment[i].memsz; | |
154 | ||
9ebdc79f YL |
155 | result = kernel_ident_mapping_init(&info, |
156 | level4p, mstart, mend); | |
084d1283 YL |
157 | |
158 | if (result) | |
159 | return result; | |
160 | } | |
161 | ||
f5deb796 | 162 | return init_transition_pgtable(image, level4p); |
5234f5eb EB |
163 | } |
164 | ||
165 | static void set_idt(void *newidt, u16 limit) | |
166 | { | |
36c4fd23 | 167 | struct desc_ptr curidt; |
5234f5eb EB |
168 | |
169 | /* x86-64 supports unaliged loads & stores */ | |
36c4fd23 EB |
170 | curidt.size = limit; |
171 | curidt.address = (unsigned long)newidt; | |
5234f5eb EB |
172 | |
173 | __asm__ __volatile__ ( | |
36c4fd23 EB |
174 | "lidtq %0\n" |
175 | : : "m" (curidt) | |
5234f5eb EB |
176 | ); |
177 | }; | |
178 | ||
179 | ||
180 | static void set_gdt(void *newgdt, u16 limit) | |
181 | { | |
36c4fd23 | 182 | struct desc_ptr curgdt; |
5234f5eb EB |
183 | |
184 | /* x86-64 supports unaligned loads & stores */ | |
36c4fd23 EB |
185 | curgdt.size = limit; |
186 | curgdt.address = (unsigned long)newgdt; | |
5234f5eb EB |
187 | |
188 | __asm__ __volatile__ ( | |
36c4fd23 EB |
189 | "lgdtq %0\n" |
190 | : : "m" (curgdt) | |
5234f5eb EB |
191 | ); |
192 | }; | |
193 | ||
194 | static void load_segments(void) | |
195 | { | |
196 | __asm__ __volatile__ ( | |
36c4fd23 EB |
197 | "\tmovl %0,%%ds\n" |
198 | "\tmovl %0,%%es\n" | |
199 | "\tmovl %0,%%ss\n" | |
200 | "\tmovl %0,%%fs\n" | |
201 | "\tmovl %0,%%gs\n" | |
2ec5e3a8 | 202 | : : "a" (__KERNEL_DS) : "memory" |
5234f5eb | 203 | ); |
5234f5eb EB |
204 | } |
205 | ||
74ca317c | 206 | #ifdef CONFIG_KEXEC_FILE |
dd5f7260 VG |
207 | /* Update purgatory as needed after various image segments have been prepared */ |
208 | static int arch_update_purgatory(struct kimage *image) | |
209 | { | |
210 | int ret = 0; | |
211 | ||
212 | if (!image->file_mode) | |
213 | return 0; | |
214 | ||
215 | /* Setup copying of backup region */ | |
216 | if (image->type == KEXEC_TYPE_CRASH) { | |
40c50c1f TG |
217 | ret = kexec_purgatory_get_set_symbol(image, |
218 | "purgatory_backup_dest", | |
dd5f7260 VG |
219 | &image->arch.backup_load_addr, |
220 | sizeof(image->arch.backup_load_addr), 0); | |
221 | if (ret) | |
222 | return ret; | |
223 | ||
40c50c1f TG |
224 | ret = kexec_purgatory_get_set_symbol(image, |
225 | "purgatory_backup_src", | |
dd5f7260 VG |
226 | &image->arch.backup_src_start, |
227 | sizeof(image->arch.backup_src_start), 0); | |
228 | if (ret) | |
229 | return ret; | |
230 | ||
40c50c1f TG |
231 | ret = kexec_purgatory_get_set_symbol(image, |
232 | "purgatory_backup_sz", | |
dd5f7260 VG |
233 | &image->arch.backup_src_sz, |
234 | sizeof(image->arch.backup_src_sz), 0); | |
235 | if (ret) | |
236 | return ret; | |
237 | } | |
238 | ||
239 | return ret; | |
240 | } | |
74ca317c VG |
241 | #else /* !CONFIG_KEXEC_FILE */ |
242 | static inline int arch_update_purgatory(struct kimage *image) | |
243 | { | |
244 | return 0; | |
245 | } | |
246 | #endif /* CONFIG_KEXEC_FILE */ | |
dd5f7260 | 247 | |
5234f5eb EB |
248 | int machine_kexec_prepare(struct kimage *image) |
249 | { | |
4bfaaef0 | 250 | unsigned long start_pgtable; |
5234f5eb EB |
251 | int result; |
252 | ||
253 | /* Calculate the offsets */ | |
72414d3f | 254 | start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT; |
5234f5eb EB |
255 | |
256 | /* Setup the identity mapped 64bit page table */ | |
257 | result = init_pgtable(image, start_pgtable); | |
72414d3f | 258 | if (result) |
5234f5eb | 259 | return result; |
5234f5eb | 260 | |
dd5f7260 VG |
261 | /* update purgatory as needed */ |
262 | result = arch_update_purgatory(image); | |
263 | if (result) | |
264 | return result; | |
265 | ||
5234f5eb EB |
266 | return 0; |
267 | } | |
268 | ||
269 | void machine_kexec_cleanup(struct kimage *image) | |
270 | { | |
f5deb796 | 271 | free_transition_pgtable(image); |
5234f5eb EB |
272 | } |
273 | ||
274 | /* | |
275 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
276 | * We are past the point of no return, committed to rebooting now. | |
277 | */ | |
3ab83521 | 278 | void machine_kexec(struct kimage *image) |
5234f5eb | 279 | { |
4bfaaef0 MD |
280 | unsigned long page_list[PAGES_NR]; |
281 | void *control_page; | |
fee7b0d8 | 282 | int save_ftrace_enabled; |
5234f5eb | 283 | |
fee7b0d8 | 284 | #ifdef CONFIG_KEXEC_JUMP |
6407df5c | 285 | if (image->preserve_context) |
fee7b0d8 HY |
286 | save_processor_state(); |
287 | #endif | |
288 | ||
289 | save_ftrace_enabled = __ftrace_enabled_save(); | |
f43fdad8 | 290 | |
5234f5eb EB |
291 | /* Interrupts aren't acceptable while we reboot */ |
292 | local_irq_disable(); | |
17f557e5 | 293 | hw_breakpoint_disable(); |
5234f5eb | 294 | |
fee7b0d8 HY |
295 | if (image->preserve_context) { |
296 | #ifdef CONFIG_X86_IO_APIC | |
297 | /* | |
298 | * We need to put APICs in legacy mode so that we can | |
299 | * get timer interrupts in second kernel. kexec/kdump | |
50374b96 BH |
300 | * paths already have calls to restore_boot_irq_mode() |
301 | * in one form or other. kexec jump path also need one. | |
fee7b0d8 | 302 | */ |
3c9e76db BH |
303 | clear_IO_APIC(); |
304 | restore_boot_irq_mode(); | |
fee7b0d8 HY |
305 | #endif |
306 | } | |
307 | ||
4bfaaef0 | 308 | control_page = page_address(image->control_code_page) + PAGE_SIZE; |
fee7b0d8 | 309 | memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE); |
4bfaaef0 | 310 | |
e3ebadd9 | 311 | page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page); |
fee7b0d8 | 312 | page_list[VA_CONTROL_PAGE] = (unsigned long)control_page; |
4bfaaef0 MD |
313 | page_list[PA_TABLE_PAGE] = |
314 | (unsigned long)__pa(page_address(image->control_code_page)); | |
5234f5eb | 315 | |
fee7b0d8 HY |
316 | if (image->type == KEXEC_TYPE_DEFAULT) |
317 | page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page) | |
318 | << PAGE_SHIFT); | |
319 | ||
fef3a7a1 HY |
320 | /* |
321 | * The segment registers are funny things, they have both a | |
2a8a3d5b EB |
322 | * visible and an invisible part. Whenever the visible part is |
323 | * set to a specific selector, the invisible part is loaded | |
324 | * with from a table in memory. At no other time is the | |
325 | * descriptor table in memory accessed. | |
5234f5eb EB |
326 | * |
327 | * I take advantage of this here by force loading the | |
328 | * segments, before I zap the gdt with an invalid value. | |
329 | */ | |
330 | load_segments(); | |
fef3a7a1 HY |
331 | /* |
332 | * The gdt & idt are now invalid. | |
5234f5eb EB |
333 | * If you want to load them you must set up your own idt & gdt. |
334 | */ | |
fef3a7a1 HY |
335 | set_gdt(phys_to_virt(0), 0); |
336 | set_idt(phys_to_virt(0), 0); | |
4bfaaef0 | 337 | |
5234f5eb | 338 | /* now call it */ |
fee7b0d8 HY |
339 | image->start = relocate_kernel((unsigned long)image->head, |
340 | (unsigned long)page_list, | |
341 | image->start, | |
4e237903 TL |
342 | image->preserve_context, |
343 | sme_active()); | |
fee7b0d8 HY |
344 | |
345 | #ifdef CONFIG_KEXEC_JUMP | |
6407df5c | 346 | if (image->preserve_context) |
fee7b0d8 HY |
347 | restore_processor_state(); |
348 | #endif | |
349 | ||
350 | __ftrace_enabled_restore(save_ftrace_enabled); | |
5234f5eb | 351 | } |
2c8c0e6b | 352 | |
fd59d231 KO |
353 | void arch_crash_save_vmcoreinfo(void) |
354 | { | |
401721ec | 355 | VMCOREINFO_NUMBER(phys_base); |
65ade2f8 | 356 | VMCOREINFO_SYMBOL(init_top_pgt); |
c100a583 | 357 | VMCOREINFO_NUMBER(pgtable_l5_enabled); |
92df5c3e KO |
358 | |
359 | #ifdef CONFIG_NUMA | |
360 | VMCOREINFO_SYMBOL(node_data); | |
361 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
362 | #endif | |
b6085a86 | 363 | vmcoreinfo_append_str("KERNELOFFSET=%lx\n", |
4545c898 | 364 | kaslr_offset()); |
401721ec | 365 | VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE); |
fd59d231 KO |
366 | } |
367 | ||
cb105258 VG |
368 | /* arch-dependent functionality related to kexec file-based syscall */ |
369 | ||
74ca317c | 370 | #ifdef CONFIG_KEXEC_FILE |
cb105258 VG |
371 | void *arch_kexec_kernel_image_load(struct kimage *image) |
372 | { | |
dd5f7260 VG |
373 | vfree(image->arch.elf_headers); |
374 | image->arch.elf_headers = NULL; | |
375 | ||
cb105258 VG |
376 | if (!image->fops || !image->fops->load) |
377 | return ERR_PTR(-ENOEXEC); | |
378 | ||
379 | return image->fops->load(image, image->kernel_buf, | |
380 | image->kernel_buf_len, image->initrd_buf, | |
381 | image->initrd_buf_len, image->cmdline_buf, | |
382 | image->cmdline_buf_len); | |
383 | } | |
384 | ||
12db5562 VG |
385 | /* |
386 | * Apply purgatory relocations. | |
387 | * | |
8aec395b PR |
388 | * @pi: Purgatory to be relocated. |
389 | * @section: Section relocations applying to. | |
390 | * @relsec: Section containing RELAs. | |
391 | * @symtabsec: Corresponding symtab. | |
12db5562 VG |
392 | * |
393 | * TODO: Some of the code belongs to generic code. Move that in kexec.c. | |
394 | */ | |
8aec395b PR |
395 | int arch_kexec_apply_relocations_add(struct purgatory_info *pi, |
396 | Elf_Shdr *section, const Elf_Shdr *relsec, | |
397 | const Elf_Shdr *symtabsec) | |
12db5562 VG |
398 | { |
399 | unsigned int i; | |
400 | Elf64_Rela *rel; | |
401 | Elf64_Sym *sym; | |
402 | void *location; | |
12db5562 VG |
403 | unsigned long address, sec_base, value; |
404 | const char *strtab, *name, *shstrtab; | |
8aec395b | 405 | const Elf_Shdr *sechdrs; |
12db5562 | 406 | |
8aec395b PR |
407 | /* String & section header string table */ |
408 | sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff; | |
409 | strtab = (char *)pi->ehdr + sechdrs[symtabsec->sh_link].sh_offset; | |
410 | shstrtab = (char *)pi->ehdr + sechdrs[pi->ehdr->e_shstrndx].sh_offset; | |
12db5562 | 411 | |
8aec395b | 412 | rel = (void *)pi->ehdr + relsec->sh_offset; |
12db5562 | 413 | |
8aec395b PR |
414 | pr_debug("Applying relocate section %s to %u\n", |
415 | shstrtab + relsec->sh_name, relsec->sh_info); | |
12db5562 | 416 | |
8aec395b | 417 | for (i = 0; i < relsec->sh_size / sizeof(*rel); i++) { |
12db5562 VG |
418 | |
419 | /* | |
420 | * rel[i].r_offset contains byte offset from beginning | |
421 | * of section to the storage unit affected. | |
422 | * | |
8da0b724 PR |
423 | * This is location to update. This is temporary buffer |
424 | * where section is currently loaded. This will finally be | |
425 | * loaded to a different address later, pointed to by | |
12db5562 VG |
426 | * ->sh_addr. kexec takes care of moving it |
427 | * (kexec_load_segment()). | |
428 | */ | |
8da0b724 PR |
429 | location = pi->purgatory_buf; |
430 | location += section->sh_offset; | |
431 | location += rel[i].r_offset; | |
12db5562 VG |
432 | |
433 | /* Final address of the location */ | |
434 | address = section->sh_addr + rel[i].r_offset; | |
435 | ||
436 | /* | |
437 | * rel[i].r_info contains information about symbol table index | |
438 | * w.r.t which relocation must be made and type of relocation | |
439 | * to apply. ELF64_R_SYM() and ELF64_R_TYPE() macros get | |
440 | * these respectively. | |
441 | */ | |
8aec395b PR |
442 | sym = (void *)pi->ehdr + symtabsec->sh_offset; |
443 | sym += ELF64_R_SYM(rel[i].r_info); | |
12db5562 VG |
444 | |
445 | if (sym->st_name) | |
446 | name = strtab + sym->st_name; | |
447 | else | |
448 | name = shstrtab + sechdrs[sym->st_shndx].sh_name; | |
449 | ||
450 | pr_debug("Symbol: %s info: %02x shndx: %02x value=%llx size: %llx\n", | |
451 | name, sym->st_info, sym->st_shndx, sym->st_value, | |
452 | sym->st_size); | |
453 | ||
454 | if (sym->st_shndx == SHN_UNDEF) { | |
455 | pr_err("Undefined symbol: %s\n", name); | |
456 | return -ENOEXEC; | |
457 | } | |
458 | ||
459 | if (sym->st_shndx == SHN_COMMON) { | |
460 | pr_err("symbol '%s' in common section\n", name); | |
461 | return -ENOEXEC; | |
462 | } | |
463 | ||
464 | if (sym->st_shndx == SHN_ABS) | |
465 | sec_base = 0; | |
8aec395b | 466 | else if (sym->st_shndx >= pi->ehdr->e_shnum) { |
12db5562 VG |
467 | pr_err("Invalid section %d for symbol %s\n", |
468 | sym->st_shndx, name); | |
469 | return -ENOEXEC; | |
470 | } else | |
8aec395b | 471 | sec_base = pi->sechdrs[sym->st_shndx].sh_addr; |
12db5562 VG |
472 | |
473 | value = sym->st_value; | |
474 | value += sec_base; | |
475 | value += rel[i].r_addend; | |
476 | ||
477 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
478 | case R_X86_64_NONE: | |
479 | break; | |
480 | case R_X86_64_64: | |
481 | *(u64 *)location = value; | |
482 | break; | |
483 | case R_X86_64_32: | |
484 | *(u32 *)location = value; | |
485 | if (value != *(u32 *)location) | |
486 | goto overflow; | |
487 | break; | |
488 | case R_X86_64_32S: | |
489 | *(s32 *)location = value; | |
490 | if ((s64)value != *(s32 *)location) | |
491 | goto overflow; | |
492 | break; | |
493 | case R_X86_64_PC32: | |
b21ebf2f | 494 | case R_X86_64_PLT32: |
12db5562 VG |
495 | value -= (u64)address; |
496 | *(u32 *)location = value; | |
497 | break; | |
498 | default: | |
499 | pr_err("Unknown rela relocation: %llu\n", | |
500 | ELF64_R_TYPE(rel[i].r_info)); | |
501 | return -ENOEXEC; | |
502 | } | |
503 | } | |
504 | return 0; | |
505 | ||
506 | overflow: | |
507 | pr_err("Overflow in relocation type %d value 0x%lx\n", | |
508 | (int)ELF64_R_TYPE(rel[i].r_info), value); | |
509 | return -ENOEXEC; | |
510 | } | |
74ca317c | 511 | #endif /* CONFIG_KEXEC_FILE */ |
1e5768ae XP |
512 | |
513 | static int | |
514 | kexec_mark_range(unsigned long start, unsigned long end, bool protect) | |
515 | { | |
516 | struct page *page; | |
517 | unsigned int nr_pages; | |
518 | ||
519 | /* | |
520 | * For physical range: [start, end]. We must skip the unassigned | |
521 | * crashk resource with zero-valued "end" member. | |
522 | */ | |
523 | if (!end || start > end) | |
524 | return 0; | |
525 | ||
526 | page = pfn_to_page(start >> PAGE_SHIFT); | |
527 | nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1; | |
528 | if (protect) | |
529 | return set_pages_ro(page, nr_pages); | |
530 | else | |
531 | return set_pages_rw(page, nr_pages); | |
532 | } | |
533 | ||
534 | static void kexec_mark_crashkres(bool protect) | |
535 | { | |
536 | unsigned long control; | |
537 | ||
538 | kexec_mark_range(crashk_low_res.start, crashk_low_res.end, protect); | |
539 | ||
540 | /* Don't touch the control code page used in crash_kexec().*/ | |
541 | control = PFN_PHYS(page_to_pfn(kexec_crash_image->control_code_page)); | |
542 | /* Control code page is located in the 2nd page. */ | |
543 | kexec_mark_range(crashk_res.start, control + PAGE_SIZE - 1, protect); | |
544 | control += KEXEC_CONTROL_PAGE_SIZE; | |
545 | kexec_mark_range(control, crashk_res.end, protect); | |
546 | } | |
547 | ||
548 | void arch_kexec_protect_crashkres(void) | |
549 | { | |
550 | kexec_mark_crashkres(true); | |
551 | } | |
552 | ||
553 | void arch_kexec_unprotect_crashkres(void) | |
554 | { | |
555 | kexec_mark_crashkres(false); | |
556 | } | |
bba4ed01 TL |
557 | |
558 | int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) | |
559 | { | |
560 | /* | |
561 | * If SME is active we need to be sure that kexec pages are | |
562 | * not encrypted because when we boot to the new kernel the | |
563 | * pages won't be accessed encrypted (initially). | |
564 | */ | |
565 | return set_memory_decrypted((unsigned long)vaddr, pages); | |
566 | } | |
567 | ||
568 | void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) | |
569 | { | |
570 | /* | |
571 | * If SME is active we need to reset the pages back to being | |
572 | * an encrypted mapping before freeing them. | |
573 | */ | |
574 | set_memory_encrypted((unsigned long)vaddr, pages); | |
575 | } |