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[S390] 1K/2K page table pages. 

This patch implements 1K/2K page table pages for s390.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2008-02-09 18:24:35 +01:00
parent 0c1f1dcd8c
commit 146e4b3c8b
11 changed files with 209 additions and 185 deletions
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2
arch/s390/mm/init.c
View File

@ -184,7 +184,7 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
pmd = pmd_offset(pud, address); pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address); pte = pte_offset_kernel(pmd, address);
if (!enable) { if (!enable) {
ptep_invalidate(address, pte); ptep_invalidate(&init_mm, address, pte);
continue; continue;
} }
*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW)); *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));

108
arch/s390/mm/pgtable.c
View File

@ -26,8 +26,14 @@
#ifndef CONFIG_64BIT #ifndef CONFIG_64BIT
#define ALLOC_ORDER 1 #define ALLOC_ORDER 1
#define TABLES_PER_PAGE 4
#define FRAG_MASK 15UL
#define SECOND_HALVES 10UL
#else #else
#define ALLOC_ORDER 2 #define ALLOC_ORDER 2
#define TABLES_PER_PAGE 2
#define FRAG_MASK 3UL
#define SECOND_HALVES 2UL
#endif #endif
unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec) unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
@ -45,13 +51,20 @@ unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
} }
page->index = page_to_phys(shadow); page->index = page_to_phys(shadow);
} }
spin_lock(&mm->page_table_lock);
list_add(&page->lru, &mm->context.crst_list);
spin_unlock(&mm->page_table_lock);
return (unsigned long *) page_to_phys(page); return (unsigned long *) page_to_phys(page);
} }
void crst_table_free(unsigned long *table) void crst_table_free(struct mm_struct *mm, unsigned long *table)
{ {
unsigned long *shadow = get_shadow_table(table); unsigned long *shadow = get_shadow_table(table);
struct page *page = virt_to_page(table);
spin_lock(&mm->page_table_lock);
list_del(&page->lru);
spin_unlock(&mm->page_table_lock);
if (shadow) if (shadow)
free_pages((unsigned long) shadow, ALLOC_ORDER); free_pages((unsigned long) shadow, ALLOC_ORDER);
free_pages((unsigned long) table, ALLOC_ORDER); free_pages((unsigned long) table, ALLOC_ORDER);
@ -60,37 +73,84 @@ void crst_table_free(unsigned long *table)
/* /*
* page table entry allocation/free routines. * page table entry allocation/free routines.
*/ */
unsigned long *page_table_alloc(int noexec) unsigned long *page_table_alloc(struct mm_struct *mm)
{ {
struct page *page = alloc_page(GFP_KERNEL); struct page *page;
unsigned long *table; unsigned long *table;
unsigned long bits;
if (!page) bits = mm->context.noexec ? 3UL : 1UL;
return NULL; spin_lock(&mm->page_table_lock);
page->index = 0; page = NULL;
if (noexec) { if (!list_empty(&mm->context.pgtable_list)) {
struct page *shadow = alloc_page(GFP_KERNEL); page = list_first_entry(&mm->context.pgtable_list,
if (!shadow) { struct page, lru);
__free_page(page); if ((page->flags & FRAG_MASK) == ((1UL << TABLES_PER_PAGE) - 1))
return NULL; page = NULL;
} }
table = (unsigned long *) page_to_phys(shadow); if (!page) {
clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE); spin_unlock(&mm->page_table_lock);
page->index = (addr_t) table; page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
if (!page)
return NULL;
pgtable_page_ctor(page);
page->flags &= ~FRAG_MASK;
table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
spin_lock(&mm->page_table_lock);
list_add(&page->lru, &mm->context.pgtable_list);
} }
pgtable_page_ctor(page);
table = (unsigned long *) page_to_phys(page); table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE); while (page->flags & bits) {
table += 256;
bits <<= 1;
}
page->flags |= bits;
if ((page->flags & FRAG_MASK) == ((1UL << TABLES_PER_PAGE) - 1))
list_move_tail(&page->lru, &mm->context.pgtable_list);
spin_unlock(&mm->page_table_lock);
return table; return table;
} }
void page_table_free(unsigned long *table) void page_table_free(struct mm_struct *mm, unsigned long *table)
{ {
unsigned long *shadow = get_shadow_pte(table); struct page *page;
unsigned long bits;
pgtable_page_dtor(virt_to_page(table));
if (shadow)
free_page((unsigned long) shadow);
free_page((unsigned long) table);
bits = mm->context.noexec ? 3UL : 1UL;
bits <<= (__pa(table) & (PAGE_SIZE - 1)) / 256 / sizeof(unsigned long);
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
spin_lock(&mm->page_table_lock);
page->flags ^= bits;
if (page->flags & FRAG_MASK) {
/* Page now has some free pgtable fragments. */
list_move(&page->lru, &mm->context.pgtable_list);
page = NULL;
} else
/* All fragments of the 4K page have been freed. */
list_del(&page->lru);
spin_unlock(&mm->page_table_lock);
if (page) {
pgtable_page_dtor(page);
__free_page(page);
}
}
void disable_noexec(struct mm_struct *mm, struct task_struct *tsk)
{
struct page *page;
spin_lock(&mm->page_table_lock);
/* Free shadow region and segment tables. */
list_for_each_entry(page, &mm->context.crst_list, lru)
if (page->index) {
free_pages((unsigned long) page->index, ALLOC_ORDER);
page->index = 0;
}
/* "Free" second halves of page tables. */
list_for_each_entry(page, &mm->context.pgtable_list, lru)
page->flags &= ~SECOND_HALVES;
spin_unlock(&mm->page_table_lock);
mm->context.noexec = 0;
update_mm(mm, tsk);
} }

14
arch/s390/mm/vmem.c
View File

@ -84,13 +84,18 @@ static inline pmd_t *vmem_pmd_alloc(void)
return pmd; return pmd;
} }
static inline pte_t *vmem_pte_alloc(void) static pte_t __init_refok *vmem_pte_alloc(void)
{ {
pte_t *pte = vmem_alloc_pages(0); pte_t *pte;
if (slab_is_available())
pte = (pte_t *) page_table_alloc(&init_mm);
else
pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
if (!pte) if (!pte)
return NULL; return NULL;
clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY, PAGE_SIZE); clear_table((unsigned long *) pte, _PAGE_TYPE_EMPTY,
PTRS_PER_PTE * sizeof(pte_t));
return pte; return pte;
} }
@ -360,6 +365,9 @@ void __init vmem_map_init(void)
{ {
int i; int i;
INIT_LIST_HEAD(&init_mm.context.crst_list);
INIT_LIST_HEAD(&init_mm.context.pgtable_list);
init_mm.context.noexec = 0;
NODE_DATA(0)->node_mem_map = VMEM_MAP; NODE_DATA(0)->node_mem_map = VMEM_MAP;
for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++)
vmem_add_mem(memory_chunk[i].addr, memory_chunk[i].size); vmem_add_mem(memory_chunk[i].addr, memory_chunk[i].size);

13
include/asm-s390/elf.h
View File

@ -115,6 +115,7 @@ typedef s390_regs elf_gregset_t;
#include <linux/sched.h> /* for task_struct */ #include <linux/sched.h> /* for task_struct */
#include <asm/system.h> /* for save_access_regs */ #include <asm/system.h> /* for save_access_regs */
#include <asm/mmu_context.h>
/* /*
* This is used to ensure we don't load something for the wrong architecture. * This is used to ensure we don't load something for the wrong architecture.
@ -214,4 +215,16 @@ do { \
} while (0) } while (0)
#endif /* __s390x__ */ #endif /* __s390x__ */
/*
* An executable for which elf_read_implies_exec() returns TRUE will
* have the READ_IMPLIES_EXEC personality flag set automatically.
*/
#define elf_read_implies_exec(ex, executable_stack) \
({ \
if (current->mm->context.noexec && \
executable_stack != EXSTACK_DISABLE_X) \
disable_noexec(current->mm, current); \
current->mm->context.noexec == 0; \
})
#endif #endif

8
include/asm-s390/mmu.h
View File

@ -1,7 +1,11 @@
#ifndef __MMU_H #ifndef __MMU_H
#define __MMU_H #define __MMU_H
/* Default "unsigned long" context */ typedef struct {
typedef unsigned long mm_context_t; struct list_head crst_list;
struct list_head pgtable_list;
unsigned long asce_bits;
int noexec;
} mm_context_t;
#endif #endif

14
include/asm-s390/mmu_context.h
View File

@ -10,15 +10,17 @@
#define __S390_MMU_CONTEXT_H #define __S390_MMU_CONTEXT_H
#include <asm/pgalloc.h> #include <asm/pgalloc.h>
#include <asm/uaccess.h>
#include <asm-generic/mm_hooks.h> #include <asm-generic/mm_hooks.h>
static inline int init_new_context(struct task_struct *tsk, static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm) struct mm_struct *mm)
{ {
mm->context = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
mm->context |= _ASCE_TYPE_REGION3; mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif #endif
mm->context.noexec = s390_noexec;
return 0; return 0;
} }
@ -32,11 +34,13 @@ static inline int init_new_context(struct task_struct *tsk,
static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk) static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
{ {
S390_lowcore.user_asce = mm->context | __pa(mm->pgd); pgd_t *pgd = mm->pgd;
S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
if (switch_amode) { if (switch_amode) {
/* Load primary space page table origin. */ /* Load primary space page table origin. */
pgd_t *shadow_pgd = get_shadow_table(mm->pgd) ? : mm->pgd; pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
S390_lowcore.user_exec_asce = mm->context | __pa(shadow_pgd); S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
asm volatile(LCTL_OPCODE" 1,1,%0\n" asm volatile(LCTL_OPCODE" 1,1,%0\n"
: : "m" (S390_lowcore.user_exec_asce) ); : : "m" (S390_lowcore.user_exec_asce) );
} else } else

36
include/asm-s390/page.h
View File

@ -74,43 +74,17 @@ static inline void copy_page(void *to, void *from)
typedef struct { unsigned long pgprot; } pgprot_t; typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pte; } pte_t; typedef struct { unsigned long pte; } pte_t;
#define pte_val(x) ((x).pte)
#define pgprot_val(x) ((x).pgprot)
#ifndef __s390x__
typedef struct { unsigned long pmd; } pmd_t; typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pud; } pud_t; typedef struct { unsigned long pud; } pud_t;
typedef struct {
unsigned long pgd0;
unsigned long pgd1;
unsigned long pgd2;
unsigned long pgd3;
} pgd_t;
#define pmd_val(x) ((x).pmd)
#define pud_val(x) ((x).pud)
#define pgd_val(x) ((x).pgd0)
#else /* __s390x__ */
typedef struct {
unsigned long pmd0;
unsigned long pmd1;
} pmd_t;
typedef struct { unsigned long pud; } pud_t;
typedef struct { unsigned long pgd; } pgd_t; typedef struct { unsigned long pgd; } pgd_t;
typedef pte_t *pgtable_t;
#define pmd_val(x) ((x).pmd0) #define pgprot_val(x) ((x).pgprot)
#define pmd_val1(x) ((x).pmd1) #define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pud_val(x) ((x).pud) #define pud_val(x) ((x).pud)
#define pgd_val(x) ((x).pgd) #define pgd_val(x) ((x).pgd)
#endif /* __s390x__ */
typedef struct page *pgtable_t;
#define __pte(x) ((pte_t) { (x) } ) #define __pte(x) ((pte_t) { (x) } )
#define __pmd(x) ((pmd_t) { (x) } ) #define __pmd(x) ((pmd_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } ) #define __pgd(x) ((pgd_t) { (x) } )
@ -167,7 +141,7 @@ static inline int pfn_valid(unsigned long pfn)
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#include <asm-generic/memory_model.h> #include <asm-generic/memory_model.h>

77
include/asm-s390/pgalloc.h
View File

@ -20,10 +20,11 @@
#define check_pgt_cache() do {} while (0) #define check_pgt_cache() do {} while (0)
unsigned long *crst_table_alloc(struct mm_struct *, int); unsigned long *crst_table_alloc(struct mm_struct *, int);
void crst_table_free(unsigned long *); void crst_table_free(struct mm_struct *, unsigned long *);
unsigned long *page_table_alloc(int); unsigned long *page_table_alloc(struct mm_struct *);
void page_table_free(unsigned long *); void page_table_free(struct mm_struct *, unsigned long *);
void disable_noexec(struct mm_struct *, struct task_struct *);
static inline void clear_table(unsigned long *s, unsigned long val, size_t n) static inline void clear_table(unsigned long *s, unsigned long val, size_t n)
{ {
@ -80,12 +81,12 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm)
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{ {
unsigned long *crst = crst_table_alloc(mm, s390_noexec); unsigned long *table = crst_table_alloc(mm, mm->context.noexec);
if (crst) if (table)
crst_table_init(crst, _SEGMENT_ENTRY_EMPTY); crst_table_init(table, _SEGMENT_ENTRY_EMPTY);
return (pmd_t *) crst; return (pmd_t *) table;
} }
#define pmd_free(mm, pmd) crst_table_free((unsigned long *)pmd) #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd)
#define pgd_populate(mm, pgd, pud) BUG() #define pgd_populate(mm, pgd, pud) BUG()
#define pgd_populate_kernel(mm, pgd, pud) BUG() #define pgd_populate_kernel(mm, pgd, pud) BUG()
@ -98,63 +99,55 @@ static inline void pud_populate_kernel(struct mm_struct *mm,
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{ {
pud_t *shadow_pud = get_shadow_table(pud);
pmd_t *shadow_pmd = get_shadow_table(pmd);
if (shadow_pud && shadow_pmd)
pud_populate_kernel(mm, shadow_pud, shadow_pmd);
pud_populate_kernel(mm, pud, pmd); pud_populate_kernel(mm, pud, pmd);
if (mm->context.noexec) {
pud = get_shadow_table(pud);
pmd = get_shadow_table(pmd);
pud_populate_kernel(mm, pud, pmd);
}
} }
#endif /* __s390x__ */ #endif /* __s390x__ */
static inline pgd_t *pgd_alloc(struct mm_struct *mm) static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{ {
unsigned long *crst = crst_table_alloc(mm, s390_noexec); unsigned long *crst;
INIT_LIST_HEAD(&mm->context.crst_list);
INIT_LIST_HEAD(&mm->context.pgtable_list);
crst = crst_table_alloc(mm, s390_noexec);
if (crst) if (crst)
crst_table_init(crst, pgd_entry_type(mm)); crst_table_init(crst, pgd_entry_type(mm));
return (pgd_t *) crst; return (pgd_t *) crst;
} }
#define pgd_free(mm, pgd) crst_table_free((unsigned long *) pgd) #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
static inline void static inline void pmd_populate_kernel(struct mm_struct *mm,
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte) pmd_t *pmd, pte_t *pte)
{ {
#ifndef __s390x__
pmd_val(pmd[0]) = _SEGMENT_ENTRY + __pa(pte);
pmd_val(pmd[1]) = _SEGMENT_ENTRY + __pa(pte+256);
pmd_val(pmd[2]) = _SEGMENT_ENTRY + __pa(pte+512);
pmd_val(pmd[3]) = _SEGMENT_ENTRY + __pa(pte+768);
#else /* __s390x__ */
pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte);
pmd_val1(*pmd) = _SEGMENT_ENTRY + __pa(pte+256);
#endif /* __s390x__ */
} }
static inline void static inline void pmd_populate(struct mm_struct *mm,
pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page) pmd_t *pmd, pgtable_t pte)
{ {
pte_t *pte = (pte_t *)page_to_phys(page);
pmd_t *shadow_pmd = get_shadow_table(pmd);
pte_t *shadow_pte = get_shadow_pte(pte);
pmd_populate_kernel(mm, pmd, pte); pmd_populate_kernel(mm, pmd, pte);
if (shadow_pmd && shadow_pte) if (mm->context.noexec) {
pmd_populate_kernel(mm, shadow_pmd, shadow_pte); pmd = get_shadow_table(pmd);
pmd_populate_kernel(mm, pmd, pte + PTRS_PER_PTE);
}
} }
#define pmd_pgtable(pmd) pmd_page(pmd)
#define pmd_pgtable(pmd) \
(pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)
/* /*
* page table entry allocation/free routines. * page table entry allocation/free routines.
*/ */
#define pte_alloc_one_kernel(mm, vmaddr) \ #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
((pte_t *) page_table_alloc(s390_noexec)) #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
#define pte_alloc_one(mm, vmaddr) \
virt_to_page(page_table_alloc(s390_noexec))
#define pte_free_kernel(mm, pte) \ #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
page_table_free((unsigned long *) pte) #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
#define pte_free(mm, pte) \
page_table_free((unsigned long *) page_to_phys((struct page *) pte))
#endif /* _S390_PGALLOC_H */ #endif /* _S390_PGALLOC_H */

105
include/asm-s390/pgtable.h
View File

@ -57,11 +57,11 @@ extern char empty_zero_page[PAGE_SIZE];
* PGDIR_SHIFT determines what a third-level page table entry can map * PGDIR_SHIFT determines what a third-level page table entry can map
*/ */
#ifndef __s390x__ #ifndef __s390x__
# define PMD_SHIFT 22 # define PMD_SHIFT 20
# define PUD_SHIFT 22 # define PUD_SHIFT 20
# define PGDIR_SHIFT 22 # define PGDIR_SHIFT 20
#else /* __s390x__ */ #else /* __s390x__ */
# define PMD_SHIFT 21 # define PMD_SHIFT 20
# define PUD_SHIFT 31 # define PUD_SHIFT 31
# define PGDIR_SHIFT 31 # define PGDIR_SHIFT 31
#endif /* __s390x__ */ #endif /* __s390x__ */
@ -79,17 +79,14 @@ extern char empty_zero_page[PAGE_SIZE];
* for S390 segment-table entries are combined to one PGD * for S390 segment-table entries are combined to one PGD
* that leads to 1024 pte per pgd * that leads to 1024 pte per pgd
*/ */
#define PTRS_PER_PTE 256
#ifndef __s390x__ #ifndef __s390x__
# define PTRS_PER_PTE 1024 #define PTRS_PER_PMD 1
# define PTRS_PER_PMD 1
# define PTRS_PER_PUD 1
# define PTRS_PER_PGD 512
#else /* __s390x__ */ #else /* __s390x__ */
# define PTRS_PER_PTE 512 #define PTRS_PER_PMD 2048
# define PTRS_PER_PMD 1024
# define PTRS_PER_PUD 1
# define PTRS_PER_PGD 2048
#endif /* __s390x__ */ #endif /* __s390x__ */
#define PTRS_PER_PUD 1
#define PTRS_PER_PGD 2048
#define FIRST_USER_ADDRESS 0 #define FIRST_USER_ADDRESS 0
@ -376,24 +373,6 @@ extern char empty_zero_page[PAGE_SIZE];
# define PxD_SHADOW_SHIFT 2 # define PxD_SHADOW_SHIFT 2
#endif /* __s390x__ */ #endif /* __s390x__ */
static inline struct page *get_shadow_page(struct page *page)
{
if (s390_noexec && page->index)
return virt_to_page((void *)(addr_t) page->index);
return NULL;
}
static inline void *get_shadow_pte(void *table)
{
unsigned long addr, offset;
struct page *page;
addr = (unsigned long) table;
offset = addr & (PAGE_SIZE - 1);
page = virt_to_page((void *)(addr ^ offset));
return (void *)(addr_t)(page->index ? (page->index | offset) : 0UL);
}
static inline void *get_shadow_table(void *table) static inline void *get_shadow_table(void *table)
{ {
unsigned long addr, offset; unsigned long addr, offset;
@ -411,17 +390,16 @@ static inline void *get_shadow_table(void *table)
* hook is made available. * hook is made available.
*/ */
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *pteptr, pte_t pteval) pte_t *ptep, pte_t entry)
{ {
pte_t *shadow_pte = get_shadow_pte(pteptr); *ptep = entry;
if (mm->context.noexec) {
*pteptr = pteval; if (!(pte_val(entry) & _PAGE_INVALID) &&
if (shadow_pte) { (pte_val(entry) & _PAGE_SWX))
if (!(pte_val(pteval) & _PAGE_INVALID) && pte_val(entry) |= _PAGE_RO;
(pte_val(pteval) & _PAGE_SWX))
pte_val(*shadow_pte) = pte_val(pteval) | _PAGE_RO;
else else
pte_val(*shadow_pte) = _PAGE_TYPE_EMPTY; pte_val(entry) = _PAGE_TYPE_EMPTY;
ptep[PTRS_PER_PTE] = entry;
} }
} }
@ -536,14 +514,6 @@ static inline int pte_young(pte_t pte)
#define pgd_clear(pgd) do { } while (0) #define pgd_clear(pgd) do { } while (0)
#define pud_clear(pud) do { } while (0) #define pud_clear(pud) do { } while (0)
static inline void pmd_clear_kernel(pmd_t * pmdp)
{
pmd_val(pmdp[0]) = _SEGMENT_ENTRY_EMPTY;
pmd_val(pmdp[1]) = _SEGMENT_ENTRY_EMPTY;
pmd_val(pmdp[2]) = _SEGMENT_ENTRY_EMPTY;
pmd_val(pmdp[3]) = _SEGMENT_ENTRY_EMPTY;
}
#else /* __s390x__ */ #else /* __s390x__ */
#define pgd_clear(pgd) do { } while (0) #define pgd_clear(pgd) do { } while (0)
@ -562,30 +532,27 @@ static inline void pud_clear(pud_t * pud)
pud_clear_kernel(shadow); pud_clear_kernel(shadow);
} }
#endif /* __s390x__ */
static inline void pmd_clear_kernel(pmd_t * pmdp) static inline void pmd_clear_kernel(pmd_t * pmdp)
{ {
pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
pmd_val1(*pmdp) = _SEGMENT_ENTRY_EMPTY;
} }
#endif /* __s390x__ */ static inline void pmd_clear(pmd_t *pmd)
static inline void pmd_clear(pmd_t * pmdp)
{ {
pmd_t *shadow_pmd = get_shadow_table(pmdp); pmd_t *shadow = get_shadow_table(pmd);
pmd_clear_kernel(pmdp); pmd_clear_kernel(pmd);
if (shadow_pmd) if (shadow)
pmd_clear_kernel(shadow_pmd); pmd_clear_kernel(shadow);
} }
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{ {
pte_t *shadow_pte = get_shadow_pte(ptep);
pte_val(*ptep) = _PAGE_TYPE_EMPTY; pte_val(*ptep) = _PAGE_TYPE_EMPTY;
if (shadow_pte) if (mm->context.noexec)
pte_val(*shadow_pte) = _PAGE_TYPE_EMPTY; pte_val(ptep[PTRS_PER_PTE]) = _PAGE_TYPE_EMPTY;
} }
/* /*
@ -666,7 +633,7 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
{ {
if (!(pte_val(*ptep) & _PAGE_INVALID)) { if (!(pte_val(*ptep) & _PAGE_INVALID)) {
#ifndef __s390x__ #ifndef __s390x__
/* S390 has 1mb segments, we are emulating 4MB segments */ /* pto must point to the start of the segment table */
pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00); pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
#else #else
/* ipte in zarch mode can do the math */ /* ipte in zarch mode can do the math */
@ -680,12 +647,12 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
pte_val(*ptep) = _PAGE_TYPE_EMPTY; pte_val(*ptep) = _PAGE_TYPE_EMPTY;
} }
static inline void ptep_invalidate(unsigned long address, pte_t *ptep) static inline void ptep_invalidate(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{ {
__ptep_ipte(address, ptep); __ptep_ipte(address, ptep);
ptep = get_shadow_pte(ptep); if (mm->context.noexec)
if (ptep) __ptep_ipte(address, ptep + PTRS_PER_PTE);
__ptep_ipte(address, ptep);
} }
/* /*
@ -707,7 +674,7 @@ static inline void ptep_invalidate(unsigned long address, pte_t *ptep)
pte_t __pte = *(__ptep); \ pte_t __pte = *(__ptep); \
if (atomic_read(&(__mm)->mm_users) > 1 || \ if (atomic_read(&(__mm)->mm_users) > 1 || \
(__mm) != current->active_mm) \ (__mm) != current->active_mm) \
ptep_invalidate(__address, __ptep); \ ptep_invalidate(__mm, __address, __ptep); \
else \ else \
pte_clear((__mm), (__address), (__ptep)); \ pte_clear((__mm), (__address), (__ptep)); \
__pte; \ __pte; \
@ -718,7 +685,7 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep) unsigned long address, pte_t *ptep)
{ {
pte_t pte = *ptep; pte_t pte = *ptep;
ptep_invalidate(address, ptep); ptep_invalidate(vma->vm_mm, address, ptep);
return pte; return pte;
} }
@ -739,7 +706,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
if (full) if (full)
pte_clear(mm, addr, ptep); pte_clear(mm, addr, ptep);
else else
ptep_invalidate(addr, ptep); ptep_invalidate(mm, addr, ptep);
return pte; return pte;
} }
@ -750,7 +717,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
if (pte_write(__pte)) { \ if (pte_write(__pte)) { \
if (atomic_read(&(__mm)->mm_users) > 1 || \ if (atomic_read(&(__mm)->mm_users) > 1 || \
(__mm) != current->active_mm) \ (__mm) != current->active_mm) \
ptep_invalidate(__addr, __ptep); \ ptep_invalidate(__mm, __addr, __ptep); \
set_pte_at(__mm, __addr, __ptep, pte_wrprotect(__pte)); \ set_pte_at(__mm, __addr, __ptep, pte_wrprotect(__pte)); \
} \ } \
}) })
@ -760,7 +727,7 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
({ \ ({ \
int __changed = !pte_same(*(__ptep), __entry); \ int __changed = !pte_same(*(__ptep), __entry); \
if (__changed) { \ if (__changed) { \
ptep_invalidate(__addr, __ptep); \ ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
set_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \ set_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
} \ } \
__changed; \ __changed; \

6
include/asm-s390/tlb.h
View File

@ -95,14 +95,14 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
* pte_free_tlb frees a pte table and clears the CRSTE for the * pte_free_tlb frees a pte table and clears the CRSTE for the
* page table from the tlb. * page table from the tlb.
*/ */
static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t page) static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte)
{ {
if (!tlb->fullmm) { if (!tlb->fullmm) {
tlb->array[tlb->nr_ptes++] = page; tlb->array[tlb->nr_ptes++] = pte;
if (tlb->nr_ptes >= tlb->nr_pmds) if (tlb->nr_ptes >= tlb->nr_pmds)
tlb_flush_mmu(tlb, 0, 0); tlb_flush_mmu(tlb, 0, 0);
} else } else
pte_free(tlb->mm, page); pte_free(tlb->mm, pte);
} }
/* /*

11
include/asm-s390/tlbflush.h
View File

@ -61,11 +61,12 @@ static inline void __tlb_flush_mm(struct mm_struct * mm)
* only ran on the local cpu. * only ran on the local cpu.
*/ */
if (MACHINE_HAS_IDTE) { if (MACHINE_HAS_IDTE) {
pgd_t *shadow = get_shadow_table(mm->pgd); if (mm->context.noexec)
__tlb_flush_idte((unsigned long)
if (shadow) get_shadow_table(mm->pgd) |
__tlb_flush_idte((unsigned long) shadow | mm->context); mm->context.asce_bits);
__tlb_flush_idte((unsigned long) mm->pgd | mm->context); __tlb_flush_idte((unsigned long) mm->pgd |
mm->context.asce_bits);
return; return;
} }
preempt_disable(); preempt_disable();