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x86-32, hibernate: Switch to original page table after resumed 

After all the pages are restored to previous address, the page
table switches back to current swapper_pg_dir. However the
swapper_pg_dir currently in used might not be consistent with
previous page table, which might cause issue after resume.

Fix this issue by switching to original page table after resume,
and the address of the original page table is saved in the hibernation
image header.

Move the manipulation of restore_cr3 into common code blocks.

Signed-off-by: Zhimin Gu <kookoo.gu@intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Zhimin Gu 2018-09-21 14:28:11 +08:00 committed by Rafael J. Wysocki
parent 0b0a6b1f76
commit 32aa276437
2 changed files with 9 additions and 5 deletions
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4
arch/x86/power/hibernate.c
View File

@ -160,6 +160,7 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
#ifdef CONFIG_X86_64
rdr->jump_address = (unsigned long)restore_registers;
rdr->jump_address_phys = __pa_symbol(restore_registers);
#endif
/*
* The restore code fixes up CR3 and CR4 in the following sequence:
@ -179,7 +180,6 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size)
* have any of the PCID bits set.
*/
rdr->cr3 = restore_cr3 & ~CR3_PCID_MASK;
#endif
return hibernation_e820_save(rdr->e820_digest);
}
@ -201,8 +201,8 @@ int arch_hibernation_header_restore(void *addr)
#ifdef CONFIG_X86_64
restore_jump_address = rdr->jump_address;
jump_address_phys = rdr->jump_address_phys;
restore_cr3 = rdr->cr3;
#endif
restore_cr3 = rdr->cr3;
if (hibernation_e820_mismatch(rdr->e820_digest)) {
pr_crit("Hibernate inconsistent memory map detected!\n");

10
arch/x86/power/hibernate_asm_32.S
View File

@ -25,6 +25,10 @@ ENTRY(swsusp_arch_suspend)
pushfl
popl saved_context_eflags
/* save cr3 */
movl %cr3, %eax
movl %eax, restore_cr3
FRAME_BEGIN
call swsusp_save
FRAME_END
@ -32,6 +36,8 @@ ENTRY(swsusp_arch_suspend)
ENDPROC(swsusp_arch_suspend)
ENTRY(restore_image)
movl restore_cr3, %ebp
movl mmu_cr4_features, %ecx
movl temp_pgt, %eax
movl %eax, %cr3
@ -66,9 +72,7 @@ done:
.align PAGE_SIZE
ENTRY(restore_registers)
/* go back to the original page tables */
movl $swapper_pg_dir, %eax
subl $__PAGE_OFFSET, %eax
movl %eax, %cr3
movl %ebp, %cr3
movl mmu_cr4_features, %ecx
jecxz 1f # cr4 Pentium and higher, skip if zero
movl %ecx, %cr4; # turn PGE back on