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delete the access restrictions of whole page table.

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access restrictions will be set on individual pages.
This commit is contained in:
NAKAMURA Gou
2013-06-19 11:39:38 +09:00
parent ff5ee67d06
commit 96f02a1d08
2 changed files with 14 additions and 8 deletions
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5
arch/x86/kernel/include/arch-memory.h
View File

@ -84,6 +84,11 @@
#define PFL2_KERN_ATTR (PFL2_PRESENT | PFL2_WRITABLE)
#define PFL1_KERN_ATTR (PFL1_PRESENT | PFL1_WRITABLE)
/* for the page table entry that points another page table */
#define PFL4_PDIR_ATTR (PFL4_PRESENT | PFL4_WRITABLE | PFL4_USER)
#define PFL3_PDIR_ATTR (PFL3_PRESENT | PFL3_WRITABLE | PFL3_USER)
#define PFL2_PDIR_ATTR (PFL2_PRESENT | PFL2_WRITABLE | PFL2_USER)
/* For easy conversion, it is better to be the same as architecture's ones */
enum ihk_mc_pt_attribute {
PTATTR_ACTIVE = 0x01,

17
arch/x86/kernel/memory.c
View File

@ -135,7 +135,7 @@ static unsigned long setup_l3(struct page_table *pt,
}
pt_phys = setup_l2(arch_alloc_page(IHK_MC_AP_CRITICAL), phys, start, end);
pt->entry[i] = pt_phys | PFL3_KERN_ATTR;
pt->entry[i] = pt_phys | PFL3_PDIR_ATTR;
}
return virt_to_phys(pt);
@ -160,8 +160,8 @@ static void init_normal_area(struct page_table *pt)
pt_phys = setup_l3(arch_alloc_page(IHK_MC_AP_CRITICAL), phys,
map_start, map_end);
pt->entry[ident_index++] = pt_phys | PFL4_KERN_ATTR;
pt->entry[virt_index++] = pt_phys | PFL4_KERN_ATTR;
pt->entry[ident_index++] = pt_phys | PFL4_PDIR_ATTR;
pt->entry[virt_index++] = pt_phys | PFL4_PDIR_ATTR;
}
}
@ -181,6 +181,7 @@ static struct page_table *__alloc_new_pt(enum ihk_mc_ap_flag ap_flag)
*/
#define ATTR_MASK (PTATTR_WRITABLE | PTATTR_USER | PTATTR_ACTIVE)
#if 0
static unsigned long attr_to_l4attr(enum ihk_mc_pt_attribute attr)
{
return (attr & ATTR_MASK) | PFL4_PRESENT;
@ -189,6 +190,7 @@ static unsigned long attr_to_l3attr(enum ihk_mc_pt_attribute attr)
{
return (attr & ATTR_MASK) | PFL3_PRESENT;
}
#endif
static unsigned long attr_to_l2attr(enum ihk_mc_pt_attribute attr)
{
unsigned long r = (attr & (ATTR_MASK | PTATTR_LARGEPAGE));
@ -322,7 +324,7 @@ static int __set_pt_page(struct page_table *pt, void *virt, unsigned long phys,
} else {
if((newpt = __alloc_new_pt(ap_flag)) == NULL)
return -ENOMEM;
pt->entry[l4idx] = virt_to_phys(newpt) | attr_to_l4attr(attr);
pt->entry[l4idx] = virt_to_phys(newpt) | PFL4_PDIR_ATTR;
pt = newpt;
}
@ -331,7 +333,7 @@ static int __set_pt_page(struct page_table *pt, void *virt, unsigned long phys,
} else {
if((newpt = __alloc_new_pt(ap_flag)) == NULL)
return -ENOMEM;
pt->entry[l3idx] = virt_to_phys(newpt) | attr_to_l3attr(attr);
pt->entry[l3idx] = virt_to_phys(newpt) | PFL3_PDIR_ATTR;
pt = newpt;
}
@ -354,8 +356,7 @@ static int __set_pt_page(struct page_table *pt, void *virt, unsigned long phys,
} else {
if((newpt = __alloc_new_pt(ap_flag)) == NULL)
return -ENOMEM;
pt->entry[l2idx] = virt_to_phys(newpt) | attr_to_l2attr(attr)
| PFL2_PRESENT;
pt->entry[l2idx] = virt_to_phys(newpt) | PFL2_PDIR_ATTR;
pt = newpt;
}
@ -547,7 +548,7 @@ int ihk_mc_pt_prepare_map(page_table_t p, void *virt, unsigned long size,
ret = -ENOMEM;
} else {
pt->entry[l4idx] = virt_to_phys(newpt)
| attr_to_l4attr(attr);
| PFL4_PDIR_ATTR;
}
}
}