mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
8ec67d97bf
The 'e820entry' and 'e820map' names have various annoyances: - the missing underscore departs from the usual kernel style and makes the code look weird, - in the past I kept confusing the 'map' with the 'entry', because a 'map' is ambiguous in that regard, - it's not really clear from the 'e820map' that this is a regular C array. Rename them to 'struct e820_entry' and 'struct e820_array' accordingly. ( Leave the legacy UAPI header alone but do the rename in the bootparam.h and e820/types.h file - outside tools relying on these defines should either adjust their code, or should use the legacy header, or should create their private copies for the definitions. ) No change in functionality. Cc: Alex Thorlton <athorlton@sgi.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Huang, Ying <ying.huang@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Jackson <pj@sgi.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
312 lines
7.5 KiB
C
312 lines
7.5 KiB
C
/*
|
|
* Hibernation support for x86-64
|
|
*
|
|
* Distribute under GPLv2
|
|
*
|
|
* Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
|
|
* Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
|
|
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/kdebug.h>
|
|
|
|
#include <crypto/hash.h>
|
|
|
|
#include <asm/e820/api.h>
|
|
#include <asm/init.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mtrr.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/suspend.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
/* Defined in hibernate_asm_64.S */
|
|
extern asmlinkage __visible int restore_image(void);
|
|
|
|
/*
|
|
* Address to jump to in the last phase of restore in order to get to the image
|
|
* kernel's text (this value is passed in the image header).
|
|
*/
|
|
unsigned long restore_jump_address __visible;
|
|
unsigned long jump_address_phys;
|
|
|
|
/*
|
|
* Value of the cr3 register from before the hibernation (this value is passed
|
|
* in the image header).
|
|
*/
|
|
unsigned long restore_cr3 __visible;
|
|
|
|
unsigned long temp_level4_pgt __visible;
|
|
|
|
unsigned long relocated_restore_code __visible;
|
|
|
|
static int set_up_temporary_text_mapping(pgd_t *pgd)
|
|
{
|
|
pmd_t *pmd;
|
|
pud_t *pud;
|
|
|
|
/*
|
|
* The new mapping only has to cover the page containing the image
|
|
* kernel's entry point (jump_address_phys), because the switch over to
|
|
* it is carried out by relocated code running from a page allocated
|
|
* specifically for this purpose and covered by the identity mapping, so
|
|
* the temporary kernel text mapping is only needed for the final jump.
|
|
* Moreover, in that mapping the virtual address of the image kernel's
|
|
* entry point must be the same as its virtual address in the image
|
|
* kernel (restore_jump_address), so the image kernel's
|
|
* restore_registers() code doesn't find itself in a different area of
|
|
* the virtual address space after switching over to the original page
|
|
* tables used by the image kernel.
|
|
*/
|
|
pud = (pud_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pud)
|
|
return -ENOMEM;
|
|
|
|
pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pmd)
|
|
return -ENOMEM;
|
|
|
|
set_pmd(pmd + pmd_index(restore_jump_address),
|
|
__pmd((jump_address_phys & PMD_MASK) | __PAGE_KERNEL_LARGE_EXEC));
|
|
set_pud(pud + pud_index(restore_jump_address),
|
|
__pud(__pa(pmd) | _KERNPG_TABLE));
|
|
set_pgd(pgd + pgd_index(restore_jump_address),
|
|
__pgd(__pa(pud) | _KERNPG_TABLE));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *alloc_pgt_page(void *context)
|
|
{
|
|
return (void *)get_safe_page(GFP_ATOMIC);
|
|
}
|
|
|
|
static int set_up_temporary_mappings(void)
|
|
{
|
|
struct x86_mapping_info info = {
|
|
.alloc_pgt_page = alloc_pgt_page,
|
|
.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
|
|
.offset = __PAGE_OFFSET,
|
|
};
|
|
unsigned long mstart, mend;
|
|
pgd_t *pgd;
|
|
int result;
|
|
int i;
|
|
|
|
pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pgd)
|
|
return -ENOMEM;
|
|
|
|
/* Prepare a temporary mapping for the kernel text */
|
|
result = set_up_temporary_text_mapping(pgd);
|
|
if (result)
|
|
return result;
|
|
|
|
/* Set up the direct mapping from scratch */
|
|
for (i = 0; i < nr_pfn_mapped; i++) {
|
|
mstart = pfn_mapped[i].start << PAGE_SHIFT;
|
|
mend = pfn_mapped[i].end << PAGE_SHIFT;
|
|
|
|
result = kernel_ident_mapping_init(&info, pgd, mstart, mend);
|
|
if (result)
|
|
return result;
|
|
}
|
|
|
|
temp_level4_pgt = __pa(pgd);
|
|
return 0;
|
|
}
|
|
|
|
static int relocate_restore_code(void)
|
|
{
|
|
pgd_t *pgd;
|
|
pud_t *pud;
|
|
|
|
relocated_restore_code = get_safe_page(GFP_ATOMIC);
|
|
if (!relocated_restore_code)
|
|
return -ENOMEM;
|
|
|
|
memcpy((void *)relocated_restore_code, &core_restore_code, PAGE_SIZE);
|
|
|
|
/* Make the page containing the relocated code executable */
|
|
pgd = (pgd_t *)__va(read_cr3()) + pgd_index(relocated_restore_code);
|
|
pud = pud_offset(pgd, relocated_restore_code);
|
|
if (pud_large(*pud)) {
|
|
set_pud(pud, __pud(pud_val(*pud) & ~_PAGE_NX));
|
|
} else {
|
|
pmd_t *pmd = pmd_offset(pud, relocated_restore_code);
|
|
|
|
if (pmd_large(*pmd)) {
|
|
set_pmd(pmd, __pmd(pmd_val(*pmd) & ~_PAGE_NX));
|
|
} else {
|
|
pte_t *pte = pte_offset_kernel(pmd, relocated_restore_code);
|
|
|
|
set_pte(pte, __pte(pte_val(*pte) & ~_PAGE_NX));
|
|
}
|
|
}
|
|
__flush_tlb_all();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int swsusp_arch_resume(void)
|
|
{
|
|
int error;
|
|
|
|
/* We have got enough memory and from now on we cannot recover */
|
|
error = set_up_temporary_mappings();
|
|
if (error)
|
|
return error;
|
|
|
|
error = relocate_restore_code();
|
|
if (error)
|
|
return error;
|
|
|
|
restore_image();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* pfn_is_nosave - check if given pfn is in the 'nosave' section
|
|
*/
|
|
|
|
int pfn_is_nosave(unsigned long pfn)
|
|
{
|
|
unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
|
|
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
|
|
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
|
|
}
|
|
|
|
#define MD5_DIGEST_SIZE 16
|
|
|
|
struct restore_data_record {
|
|
unsigned long jump_address;
|
|
unsigned long jump_address_phys;
|
|
unsigned long cr3;
|
|
unsigned long magic;
|
|
u8 e820_digest[MD5_DIGEST_SIZE];
|
|
};
|
|
|
|
#define RESTORE_MAGIC 0x23456789ABCDEF01UL
|
|
|
|
#if IS_BUILTIN(CONFIG_CRYPTO_MD5)
|
|
/**
|
|
* get_e820_md5 - calculate md5 according to given e820 map
|
|
*
|
|
* @map: the e820 map to be calculated
|
|
* @buf: the md5 result to be stored to
|
|
*/
|
|
static int get_e820_md5(struct e820_array *map, void *buf)
|
|
{
|
|
struct scatterlist sg;
|
|
struct crypto_ahash *tfm;
|
|
int size;
|
|
int ret = 0;
|
|
|
|
tfm = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(tfm))
|
|
return -ENOMEM;
|
|
|
|
{
|
|
AHASH_REQUEST_ON_STACK(req, tfm);
|
|
size = offsetof(struct e820_array, map)
|
|
+ sizeof(struct e820_entry) * map->nr_map;
|
|
ahash_request_set_tfm(req, tfm);
|
|
sg_init_one(&sg, (u8 *)map, size);
|
|
ahash_request_set_callback(req, 0, NULL, NULL);
|
|
ahash_request_set_crypt(req, &sg, buf, size);
|
|
|
|
if (crypto_ahash_digest(req))
|
|
ret = -EINVAL;
|
|
ahash_request_zero(req);
|
|
}
|
|
crypto_free_ahash(tfm);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void hibernation_e820_save(void *buf)
|
|
{
|
|
get_e820_md5(e820_saved, buf);
|
|
}
|
|
|
|
static bool hibernation_e820_mismatch(void *buf)
|
|
{
|
|
int ret;
|
|
u8 result[MD5_DIGEST_SIZE];
|
|
|
|
memset(result, 0, MD5_DIGEST_SIZE);
|
|
/* If there is no digest in suspend kernel, let it go. */
|
|
if (!memcmp(result, buf, MD5_DIGEST_SIZE))
|
|
return false;
|
|
|
|
ret = get_e820_md5(e820_saved, result);
|
|
if (ret)
|
|
return true;
|
|
|
|
return memcmp(result, buf, MD5_DIGEST_SIZE) ? true : false;
|
|
}
|
|
#else
|
|
static void hibernation_e820_save(void *buf)
|
|
{
|
|
}
|
|
|
|
static bool hibernation_e820_mismatch(void *buf)
|
|
{
|
|
/* If md5 is not builtin for restore kernel, let it go. */
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* arch_hibernation_header_save - populate the architecture specific part
|
|
* of a hibernation image header
|
|
* @addr: address to save the data at
|
|
*/
|
|
int arch_hibernation_header_save(void *addr, unsigned int max_size)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
if (max_size < sizeof(struct restore_data_record))
|
|
return -EOVERFLOW;
|
|
rdr->jump_address = (unsigned long)&restore_registers;
|
|
rdr->jump_address_phys = __pa_symbol(&restore_registers);
|
|
rdr->cr3 = restore_cr3;
|
|
rdr->magic = RESTORE_MAGIC;
|
|
|
|
hibernation_e820_save(rdr->e820_digest);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* arch_hibernation_header_restore - read the architecture specific data
|
|
* from the hibernation image header
|
|
* @addr: address to read the data from
|
|
*/
|
|
int arch_hibernation_header_restore(void *addr)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
restore_jump_address = rdr->jump_address;
|
|
jump_address_phys = rdr->jump_address_phys;
|
|
restore_cr3 = rdr->cr3;
|
|
|
|
if (rdr->magic != RESTORE_MAGIC) {
|
|
pr_crit("Unrecognized hibernate image header format!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (hibernation_e820_mismatch(rdr->e820_digest)) {
|
|
pr_crit("Hibernate inconsistent memory map detected!\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|