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-rw-r--r--arch/s390/mm/cmm.c12
-rw-r--r--arch/s390/mm/fault.c46
-rw-r--r--arch/s390/mm/gup.c83
-rw-r--r--arch/s390/mm/mmap.c21
-rw-r--r--arch/s390/mm/pageattr.c4
-rw-r--r--arch/s390/mm/pgtable.c66
6 files changed, 90 insertions, 142 deletions
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index 9d84a1feefe..79ddd580d60 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -253,12 +253,12 @@ static int cmm_skip_blanks(char *cp, char **endp)
static struct ctl_table cmm_table[];
-static int cmm_pages_handler(ctl_table *ctl, int write, void __user *buffer,
- size_t *lenp, loff_t *ppos)
+static int cmm_pages_handler(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
{
char buf[16], *p;
+ unsigned int len;
long nr;
- int len;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
@@ -293,12 +293,12 @@ static int cmm_pages_handler(ctl_table *ctl, int write, void __user *buffer,
return 0;
}
-static int cmm_timeout_handler(ctl_table *ctl, int write, void __user *buffer,
- size_t *lenp, loff_t *ppos)
+static int cmm_timeout_handler(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
{
char buf[64], *p;
long nr, seconds;
- int len;
+ unsigned int len;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index fc6679210d8..d95265b2719 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -115,13 +115,8 @@ static inline int user_space_fault(unsigned long trans_exc_code)
if (trans_exc_code == 2)
/* Access via secondary space, set_fs setting decides */
return current->thread.mm_segment.ar4;
- if (s390_user_mode == HOME_SPACE_MODE)
- /* User space if the access has been done via home space. */
- return trans_exc_code == 3;
/*
- * If the user space is not the home space the kernel runs in home
- * space. Access via secondary space has already been covered,
- * access via primary space or access register is from user space
+ * Access via primary space or access register is from user space
* and access via home space is from the kernel.
*/
return trans_exc_code != 3;
@@ -428,50 +423,13 @@ void __kprobes do_dat_exception(struct pt_regs *regs)
do_fault_error(regs, fault);
}
-#ifdef CONFIG_64BIT
-void __kprobes do_asce_exception(struct pt_regs *regs)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma;
- unsigned long trans_exc_code;
-
- /*
- * The instruction that caused the program check has
- * been nullified. Don't signal single step via SIGTRAP.
- */
- clear_tsk_thread_flag(current, TIF_PER_TRAP);
-
- trans_exc_code = regs->int_parm_long;
- if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
- goto no_context;
-
- down_read(&mm->mmap_sem);
- vma = find_vma(mm, trans_exc_code & __FAIL_ADDR_MASK);
- up_read(&mm->mmap_sem);
-
- if (vma) {
- update_mm(mm, current);
- return;
- }
-
- /* User mode accesses just cause a SIGSEGV */
- if (user_mode(regs)) {
- do_sigsegv(regs, SEGV_MAPERR);
- return;
- }
-
-no_context:
- do_no_context(regs);
-}
-#endif
-
int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
{
struct pt_regs regs;
int access, fault;
/* Emulate a uaccess fault from kernel mode. */
- regs.psw.mask = psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK;
+ regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK;
if (!irqs_disabled())
regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) __builtin_return_address(0);
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 5d758db27bd..639fce46400 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -180,9 +180,15 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
addr = start;
len = (unsigned long) nr_pages << PAGE_SHIFT;
end = start + len;
- if ((end < start) || (end > TASK_SIZE))
+ if ((end <= start) || (end > TASK_SIZE))
return 0;
-
+ /*
+ * local_irq_save() doesn't prevent pagetable teardown, but does
+ * prevent the pagetables from being freed on s390.
+ *
+ * So long as we atomically load page table pointers versus teardown,
+ * we can follow the address down to the the page and take a ref on it.
+ */
local_irq_save(flags);
pgdp = pgd_offset(mm, addr);
do {
@@ -219,63 +225,22 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages)
{
struct mm_struct *mm = current->mm;
- unsigned long addr, len, end;
- unsigned long next;
- pgd_t *pgdp, pgd;
- int nr = 0;
+ int nr, ret;
start &= PAGE_MASK;
- addr = start;
- len = (unsigned long) nr_pages << PAGE_SHIFT;
- end = start + len;
- if ((end < start) || (end > TASK_SIZE))
- goto slow_irqon;
-
- /*
- * local_irq_disable() doesn't prevent pagetable teardown, but does
- * prevent the pagetables from being freed on s390.
- *
- * So long as we atomically load page table pointers versus teardown,
- * we can follow the address down to the the page and take a ref on it.
- */
- local_irq_disable();
- pgdp = pgd_offset(mm, addr);
- do {
- pgd = *pgdp;
- barrier();
- next = pgd_addr_end(addr, end);
- if (pgd_none(pgd))
- goto slow;
- if (!gup_pud_range(pgdp, pgd, addr, next, write, pages, &nr))
- goto slow;
- } while (pgdp++, addr = next, addr != end);
- local_irq_enable();
-
- VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
- return nr;
-
- {
- int ret;
-slow:
- local_irq_enable();
-slow_irqon:
- /* Try to get the remaining pages with get_user_pages */
- start += nr << PAGE_SHIFT;
- pages += nr;
-
- down_read(&mm->mmap_sem);
- ret = get_user_pages(current, mm, start,
- (end - start) >> PAGE_SHIFT, write, 0, pages, NULL);
- up_read(&mm->mmap_sem);
-
- /* Have to be a bit careful with return values */
- if (nr > 0) {
- if (ret < 0)
- ret = nr;
- else
- ret += nr;
- }
-
- return ret;
- }
+ nr = __get_user_pages_fast(start, nr_pages, write, pages);
+ if (nr == nr_pages)
+ return nr;
+
+ /* Try to get the remaining pages with get_user_pages */
+ start += nr << PAGE_SHIFT;
+ pages += nr;
+ down_read(&mm->mmap_sem);
+ ret = get_user_pages(current, mm, start,
+ nr_pages - nr, write, 0, pages, NULL);
+ up_read(&mm->mmap_sem);
+ /* Have to be a bit careful with return values */
+ if (nr > 0)
+ ret = (ret < 0) ? nr : ret + nr;
+ return ret;
}
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 40023290ee5..9b436c21195 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -64,6 +64,11 @@ static unsigned long mmap_rnd(void)
return (get_random_int() & 0x7ffUL) << PAGE_SHIFT;
}
+static unsigned long mmap_base_legacy(void)
+{
+ return TASK_UNMAPPED_BASE + mmap_rnd();
+}
+
static inline unsigned long mmap_base(void)
{
unsigned long gap = rlimit(RLIMIT_STACK);
@@ -89,7 +94,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* bit is set, or if the expected stack growth is unlimited:
*/
if (mmap_is_legacy()) {
- mm->mmap_base = TASK_UNMAPPED_BASE;
+ mm->mmap_base = mmap_base_legacy();
mm->get_unmapped_area = arch_get_unmapped_area;
} else {
mm->mmap_base = mmap_base();
@@ -101,18 +106,12 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
int s390_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
{
- int rc;
-
if (is_compat_task() || (TASK_SIZE >= (1UL << 53)))
return 0;
if (!(flags & MAP_FIXED))
addr = 0;
- if ((addr + len) >= TASK_SIZE) {
- rc = crst_table_upgrade(current->mm, 1UL << 53);
- if (rc)
- return rc;
- update_mm(current->mm, current);
- }
+ if ((addr + len) >= TASK_SIZE)
+ return crst_table_upgrade(current->mm, 1UL << 53);
return 0;
}
@@ -132,7 +131,6 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
- update_mm(mm, current);
area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
}
return area;
@@ -155,7 +153,6 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
- update_mm(mm, current);
area = arch_get_unmapped_area_topdown(filp, addr, len,
pgoff, flags);
}
@@ -172,7 +169,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* bit is set, or if the expected stack growth is unlimited:
*/
if (mmap_is_legacy()) {
- mm->mmap_base = TASK_UNMAPPED_BASE;
+ mm->mmap_base = mmap_base_legacy();
mm->get_unmapped_area = s390_get_unmapped_area;
} else {
mm->mmap_base = mmap_base();
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index 990397420e6..8400f494623 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -9,6 +9,7 @@
#include <asm/pgtable.h>
#include <asm/page.h>
+#if PAGE_DEFAULT_KEY
static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
{
asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
@@ -16,7 +17,7 @@ static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
return addr;
}
-void storage_key_init_range(unsigned long start, unsigned long end)
+void __storage_key_init_range(unsigned long start, unsigned long end)
{
unsigned long boundary, size;
@@ -36,6 +37,7 @@ void storage_key_init_range(unsigned long start, unsigned long end)
start += PAGE_SIZE;
}
}
+#endif
static pte_t *walk_page_table(unsigned long addr)
{
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index de8cbc30dcd..e794c88f699 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -48,12 +48,23 @@ void crst_table_free(struct mm_struct *mm, unsigned long *table)
}
#ifdef CONFIG_64BIT
+static void __crst_table_upgrade(void *arg)
+{
+ struct mm_struct *mm = arg;
+
+ if (current->active_mm == mm)
+ update_mm(mm, current);
+ __tlb_flush_local();
+}
+
int crst_table_upgrade(struct mm_struct *mm, unsigned long limit)
{
unsigned long *table, *pgd;
unsigned long entry;
+ int flush;
BUG_ON(limit > (1UL << 53));
+ flush = 0;
repeat:
table = crst_table_alloc(mm);
if (!table)
@@ -79,12 +90,15 @@ repeat:
mm->pgd = (pgd_t *) table;
mm->task_size = mm->context.asce_limit;
table = NULL;
+ flush = 1;
}
spin_unlock_bh(&mm->page_table_lock);
if (table)
crst_table_free(mm, table);
if (mm->context.asce_limit < limit)
goto repeat;
+ if (flush)
+ on_each_cpu(__crst_table_upgrade, mm, 0);
return 0;
}
@@ -92,6 +106,8 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
{
pgd_t *pgd;
+ if (current->active_mm == mm)
+ __tlb_flush_mm(mm);
while (mm->context.asce_limit > limit) {
pgd = mm->pgd;
switch (pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) {
@@ -114,6 +130,8 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
mm->task_size = mm->context.asce_limit;
crst_table_free(mm, (unsigned long *) pgd);
}
+ if (current->active_mm == mm)
+ update_mm(mm, current);
}
#endif
@@ -754,7 +772,11 @@ static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm,
__free_page(page);
return NULL;
}
- pgtable_page_ctor(page);
+ if (!pgtable_page_ctor(page)) {
+ kfree(mp);
+ __free_page(page);
+ return NULL;
+ }
mp->vmaddr = vmaddr & PMD_MASK;
INIT_LIST_HEAD(&mp->mapper);
page->index = (unsigned long) mp;
@@ -884,7 +906,10 @@ unsigned long *page_table_alloc(struct mm_struct *mm, unsigned long vmaddr)
page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
if (!page)
return NULL;
- pgtable_page_ctor(page);
+ if (!pgtable_page_ctor(page)) {
+ __free_page(page);
+ return NULL;
+ }
atomic_set(&page->_mapcount, 1);
table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_INVALID, PAGE_SIZE);
@@ -1087,10 +1112,9 @@ again:
continue;
/* Allocate new page table with pgstes */
new = page_table_alloc_pgste(mm, addr);
- if (!new) {
- mm->context.has_pgste = 0;
- continue;
- }
+ if (!new)
+ return -ENOMEM;
+
spin_lock(&mm->page_table_lock);
if (likely((unsigned long *) pmd_deref(*pmd) == table)) {
/* Nuke pmd entry pointing to the "short" page table */
@@ -1128,13 +1152,15 @@ static unsigned long page_table_realloc_pud(struct mmu_gather *tlb,
if (pud_none_or_clear_bad(pud))
continue;
next = page_table_realloc_pmd(tlb, mm, pud, addr, next);
+ if (unlikely(IS_ERR_VALUE(next)))
+ return next;
} while (pud++, addr = next, addr != end);
return addr;
}
-static void page_table_realloc(struct mmu_gather *tlb, struct mm_struct *mm,
- unsigned long addr, unsigned long end)
+static unsigned long page_table_realloc(struct mmu_gather *tlb, struct mm_struct *mm,
+ unsigned long addr, unsigned long end)
{
unsigned long next;
pgd_t *pgd;
@@ -1145,7 +1171,11 @@ static void page_table_realloc(struct mmu_gather *tlb, struct mm_struct *mm,
if (pgd_none_or_clear_bad(pgd))
continue;
next = page_table_realloc_pud(tlb, mm, pgd, addr, next);
+ if (unlikely(IS_ERR_VALUE(next)))
+ return next;
} while (pgd++, addr = next, addr != end);
+
+ return 0;
}
/*
@@ -1157,10 +1187,6 @@ int s390_enable_sie(void)
struct mm_struct *mm = tsk->mm;
struct mmu_gather tlb;
- /* Do we have switched amode? If no, we cannot do sie */
- if (s390_user_mode == HOME_SPACE_MODE)
- return -EINVAL;
-
/* Do we have pgstes? if yes, we are done */
if (mm_has_pgste(tsk->mm))
return 0;
@@ -1169,9 +1195,9 @@ int s390_enable_sie(void)
/* split thp mappings and disable thp for future mappings */
thp_split_mm(mm);
/* Reallocate the page tables with pgstes */
- mm->context.has_pgste = 1;
tlb_gather_mmu(&tlb, mm, 0, TASK_SIZE);
- page_table_realloc(&tlb, mm, 0, TASK_SIZE);
+ if (!page_table_realloc(&tlb, mm, 0, TASK_SIZE))
+ mm->context.has_pgste = 1;
tlb_finish_mmu(&tlb, 0, TASK_SIZE);
up_write(&mm->mmap_sem);
return mm->context.has_pgste ? 0 : -ENOMEM;
@@ -1225,11 +1251,11 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
assert_spin_locked(&mm->page_table_lock);
/* FIFO */
- if (!mm->pmd_huge_pte)
+ if (!pmd_huge_pte(mm, pmdp))
INIT_LIST_HEAD(lh);
else
- list_add(lh, (struct list_head *) mm->pmd_huge_pte);
- mm->pmd_huge_pte = pgtable;
+ list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp));
+ pmd_huge_pte(mm, pmdp) = pgtable;
}
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
@@ -1241,12 +1267,12 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
assert_spin_locked(&mm->page_table_lock);
/* FIFO */
- pgtable = mm->pmd_huge_pte;
+ pgtable = pmd_huge_pte(mm, pmdp);
lh = (struct list_head *) pgtable;
if (list_empty(lh))
- mm->pmd_huge_pte = NULL;
+ pmd_huge_pte(mm, pmdp) = NULL;
else {
- mm->pmd_huge_pte = (pgtable_t) lh->next;
+ pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
list_del(lh);
}
ptep = (pte_t *) pgtable;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-07 09:44:29 +0000