lkml.org 
[lkml]   [2007]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC][PATCH -mm 4/4] Hibernation: Use temporary page tables for kernel text mapping on x86_64
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Use temporary page tables for the kernel text mapping during hibernation restore
on x86_64.

Without the patch, the original boot kernel's page tables that represent the
kernel text mapping are used while the core of the image kernel is being
restored. However, in principle, if the boot kernel is not identical to the
image kernel, the location of these page tables in the image kernel need not be
the same, so we should create a safe copy of the kernel text mapping prior to
restoring the core of the image kernel.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
arch/x86_64/kernel/suspend.c | 41 ++++++++++++++++++++++++++++++++++-------
1 file changed, 34 insertions(+), 7 deletions(-)

Index: linux-2.6.23-rc3/arch/x86_64/kernel/suspend.c
===================================================================
--- linux-2.6.23-rc3.orig/arch/x86_64/kernel/suspend.c
+++ linux-2.6.23-rc3/arch/x86_64/kernel/suspend.c
@@ -182,7 +182,7 @@ static int res_phys_pud_init(pud_t *pud,

if (paddr >= end)
break;
- pe = _PAGE_NX | _PAGE_PSE | _KERNPG_TABLE | paddr;
+ pe = __PAGE_KERNEL_LARGE | paddr;
pe &= __supported_pte_mask;
set_pmd(pmd, __pmd(pe));
}
@@ -190,25 +190,42 @@ static int res_phys_pud_init(pud_t *pud,
return 0;
}

+static int res_kernel_text_pud_init(pud_t *pud, unsigned long start)
+{
+ pmd_t *pmd;
+ unsigned long paddr;
+
+ pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
+ if (!pmd)
+ return -ENOMEM;
+ set_pud(pud + pud_index(start), __pud(__pa(pmd) | _KERNPG_TABLE));
+ for (paddr = 0; paddr < KERNEL_TEXT_SIZE; pmd++, paddr += PMD_SIZE) {
+ unsigned long pe;
+
+ pe = __PAGE_KERNEL_LARGE_EXEC | _PAGE_GLOBAL | paddr;
+ pe &= __supported_pte_mask;
+ set_pmd(pmd, __pmd(pe));
+ }
+
+ return 0;
+}
+
static int set_up_temporary_mappings(void)
{
unsigned long start, end, next;
+ pud_t *pud;
int error;

temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
if (!temp_level4_pgt)
return -ENOMEM;

- /* It is safe to reuse the original kernel mapping */
- set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
- init_level4_pgt[pgd_index(__START_KERNEL_map)]);
-
/* Set up the direct mapping from scratch */
start = (unsigned long)pfn_to_kaddr(0);
end = (unsigned long)pfn_to_kaddr(end_pfn);

for (; start < end; start = next) {
- pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
+ pud = (pud_t *)get_safe_page(GFP_ATOMIC);
if (!pud)
return -ENOMEM;
next = start + PGDIR_SIZE;
@@ -219,7 +236,17 @@ static int set_up_temporary_mappings(voi
set_pgd(temp_level4_pgt + pgd_index(start),
mk_kernel_pgd(__pa(pud)));
}
- return 0;
+
+ /* Set up the kernel text mapping from scratch */
+ pud = (pud_t *)get_safe_page(GFP_ATOMIC);
+ if (!pud)
+ return -ENOMEM;
+ error = res_kernel_text_pud_init(pud, __START_KERNEL_map);
+ if (!error)
+ set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+ __pgd(__pa(pud) | _PAGE_TABLE));
+
+ return error;
}

int swsusp_arch_resume(void)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2007-08-22 10:17    [W:1.233 / U:0.760 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site