s390/mm: uninline ptep_xxx functions from pgtable.h
The code in the various ptep_xxx functions has grown quite large, consolidate them to four out-of-line functions: ptep_xchg_direct to exchange a pte with another with immediate flushing ptep_xchg_lazy to exchange a pte with another in a batched update ptep_modify_prot_start to begin a protection flags update ptep_modify_prot_commit to commit a protection flags update Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
Родитель
988b86e69d
Коммит
ebde765c0e
|
|
@ -680,69 +680,8 @@ static inline void pgste_set(pte_t *ptep, pgste_t pgste)
|
|||
#endif
|
||||
}
|
||||
|
||||
static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste,
|
||||
struct mm_struct *mm)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
unsigned long address, bits, skey;
|
||||
|
||||
if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID)
|
||||
return pgste;
|
||||
address = pte_val(pte) & PAGE_MASK;
|
||||
skey = (unsigned long) page_get_storage_key(address);
|
||||
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
|
||||
/* Transfer page changed & referenced bit to guest bits in pgste */
|
||||
pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
|
||||
/* Copy page access key and fetch protection bit to pgste */
|
||||
pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
|
||||
pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
|
||||
#endif
|
||||
return pgste;
|
||||
|
||||
}
|
||||
|
||||
static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
|
||||
struct mm_struct *mm)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
unsigned long address;
|
||||
unsigned long nkey;
|
||||
|
||||
if (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID)
|
||||
return;
|
||||
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
|
||||
address = pte_val(entry) & PAGE_MASK;
|
||||
/*
|
||||
* Set page access key and fetch protection bit from pgste.
|
||||
* The guest C/R information is still in the PGSTE, set real
|
||||
* key C/R to 0.
|
||||
*/
|
||||
nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
|
||||
nkey |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
|
||||
page_set_storage_key(address, nkey, 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
|
||||
{
|
||||
if ((pte_val(entry) & _PAGE_PRESENT) &&
|
||||
(pte_val(entry) & _PAGE_WRITE) &&
|
||||
!(pte_val(entry) & _PAGE_INVALID)) {
|
||||
if (!MACHINE_HAS_ESOP) {
|
||||
/*
|
||||
* Without enhanced suppression-on-protection force
|
||||
* the dirty bit on for all writable ptes.
|
||||
*/
|
||||
pte_val(entry) |= _PAGE_DIRTY;
|
||||
pte_val(entry) &= ~_PAGE_PROTECT;
|
||||
}
|
||||
if (!(pte_val(entry) & _PAGE_PROTECT))
|
||||
/* This pte allows write access, set user-dirty */
|
||||
pgste_val(pgste) |= PGSTE_UC_BIT;
|
||||
}
|
||||
*ptep = entry;
|
||||
return pgste;
|
||||
}
|
||||
bool pgste_test_and_clear_dirty(struct mm_struct *, unsigned long address);
|
||||
void ptep_ipte_notify(struct mm_struct *, unsigned long addr, pte_t *);
|
||||
|
||||
/**
|
||||
* struct gmap_struct - guest address space
|
||||
|
|
@ -791,47 +730,11 @@ int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
|
|||
int gmap_fault(struct gmap *, unsigned long gaddr, unsigned int fault_flags);
|
||||
void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
|
||||
void __gmap_zap(struct gmap *, unsigned long gaddr);
|
||||
bool gmap_test_and_clear_dirty(unsigned long address, struct gmap *);
|
||||
|
||||
|
||||
void gmap_register_ipte_notifier(struct gmap_notifier *);
|
||||
void gmap_unregister_ipte_notifier(struct gmap_notifier *);
|
||||
int gmap_ipte_notify(struct gmap *, unsigned long start, unsigned long len);
|
||||
void gmap_do_ipte_notify(struct mm_struct *, unsigned long addr, pte_t *);
|
||||
|
||||
static inline pgste_t pgste_ipte_notify(struct mm_struct *mm,
|
||||
unsigned long addr,
|
||||
pte_t *ptep, pgste_t pgste)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
if (pgste_val(pgste) & PGSTE_IN_BIT) {
|
||||
pgste_val(pgste) &= ~PGSTE_IN_BIT;
|
||||
gmap_do_ipte_notify(mm, addr, ptep);
|
||||
}
|
||||
#endif
|
||||
return pgste;
|
||||
}
|
||||
|
||||
/*
|
||||
* Certain architectures need to do special things when PTEs
|
||||
* within a page table are directly modified. Thus, the following
|
||||
* hook is made available.
|
||||
*/
|
||||
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t entry)
|
||||
{
|
||||
pgste_t pgste;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste_val(pgste) &= ~_PGSTE_GPS_ZERO;
|
||||
pgste_set_key(ptep, pgste, entry, mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, entry);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else {
|
||||
*ptep = entry;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* query functions pte_write/pte_dirty/pte_young only work if
|
||||
|
|
@ -998,104 +901,6 @@ static inline void __ptep_ipte_range(unsigned long address, int nr, pte_t *ptep)
|
|||
} while (nr != 255);
|
||||
}
|
||||
|
||||
static inline void ptep_flush_direct(struct mm_struct *mm,
|
||||
unsigned long address, pte_t *ptep)
|
||||
{
|
||||
int active, count;
|
||||
|
||||
if (pte_val(*ptep) & _PAGE_INVALID)
|
||||
return;
|
||||
active = (mm == current->active_mm) ? 1 : 0;
|
||||
count = atomic_add_return(0x10000, &mm->context.attach_count);
|
||||
if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active &&
|
||||
cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
|
||||
__ptep_ipte_local(address, ptep);
|
||||
else
|
||||
__ptep_ipte(address, ptep);
|
||||
atomic_sub(0x10000, &mm->context.attach_count);
|
||||
}
|
||||
|
||||
static inline void ptep_flush_lazy(struct mm_struct *mm,
|
||||
unsigned long address, pte_t *ptep)
|
||||
{
|
||||
int active, count;
|
||||
|
||||
if (pte_val(*ptep) & _PAGE_INVALID)
|
||||
return;
|
||||
active = (mm == current->active_mm) ? 1 : 0;
|
||||
count = atomic_add_return(0x10000, &mm->context.attach_count);
|
||||
if ((count & 0xffff) <= active) {
|
||||
pte_val(*ptep) |= _PAGE_INVALID;
|
||||
mm->context.flush_mm = 1;
|
||||
} else
|
||||
__ptep_ipte(address, ptep);
|
||||
atomic_sub(0x10000, &mm->context.attach_count);
|
||||
}
|
||||
|
||||
/*
|
||||
* Get (and clear) the user dirty bit for a pte.
|
||||
*/
|
||||
static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
|
||||
unsigned long addr,
|
||||
pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
int dirty;
|
||||
|
||||
if (!mm_has_pgste(mm))
|
||||
return 0;
|
||||
pgste = pgste_get_lock(ptep);
|
||||
dirty = !!(pgste_val(pgste) & PGSTE_UC_BIT);
|
||||
pgste_val(pgste) &= ~PGSTE_UC_BIT;
|
||||
pte = *ptep;
|
||||
if (dirty && (pte_val(pte) & _PAGE_PRESENT)) {
|
||||
pgste = pgste_ipte_notify(mm, addr, ptep, pgste);
|
||||
__ptep_ipte(addr, ptep);
|
||||
if (MACHINE_HAS_ESOP || !(pte_val(pte) & _PAGE_WRITE))
|
||||
pte_val(pte) |= _PAGE_PROTECT;
|
||||
else
|
||||
pte_val(pte) |= _PAGE_INVALID;
|
||||
*ptep = pte;
|
||||
}
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
return dirty;
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
|
||||
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
int young;
|
||||
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(vma->vm_mm, addr, ptep, pgste);
|
||||
}
|
||||
|
||||
pte = *ptep;
|
||||
ptep_flush_direct(vma->vm_mm, addr, ptep);
|
||||
young = pte_young(pte);
|
||||
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
pgste = pgste_update_all(pte, pgste, vma->vm_mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, pte_mkold(pte));
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else
|
||||
*ptep = pte_mkold(pte);
|
||||
|
||||
return young;
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
|
||||
static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
|
||||
unsigned long address, pte_t *ptep)
|
||||
{
|
||||
return ptep_test_and_clear_young(vma, address, ptep);
|
||||
}
|
||||
|
||||
/*
|
||||
* This is hard to understand. ptep_get_and_clear and ptep_clear_flush
|
||||
* both clear the TLB for the unmapped pte. The reason is that
|
||||
|
|
@ -1109,91 +914,42 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
|
|||
* have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range
|
||||
* is a nop.
|
||||
*/
|
||||
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
||||
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
|
||||
pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t);
|
||||
pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t);
|
||||
|
||||
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
|
||||
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
pte_t pte = *ptep;
|
||||
|
||||
pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte));
|
||||
return pte_young(pte);
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
|
||||
static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
|
||||
unsigned long address, pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
|
||||
return ptep_test_and_clear_young(vma, address, ptep);
|
||||
}
|
||||
|
||||
pte = *ptep;
|
||||
ptep_flush_lazy(mm, address, ptep);
|
||||
pte_val(*ptep) = _PAGE_INVALID;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_update_all(pte, pgste, mm);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
}
|
||||
return pte;
|
||||
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
||||
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
|
||||
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
|
||||
unsigned long address,
|
||||
pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste_ipte_notify(mm, address, ptep, pgste);
|
||||
}
|
||||
|
||||
pte = *ptep;
|
||||
ptep_flush_lazy(mm, address, ptep);
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_update_all(pte, pgste, mm);
|
||||
pgste_set(ptep, pgste);
|
||||
}
|
||||
return pte;
|
||||
}
|
||||
|
||||
static inline void ptep_modify_prot_commit(struct mm_struct *mm,
|
||||
unsigned long address,
|
||||
pte_t *ptep, pte_t pte)
|
||||
{
|
||||
pgste_t pgste;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get(ptep);
|
||||
pgste_set_key(ptep, pgste, pte, mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, pte);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else
|
||||
*ptep = pte;
|
||||
}
|
||||
pte_t ptep_modify_prot_start(struct mm_struct *, unsigned long, pte_t *);
|
||||
void ptep_modify_prot_commit(struct mm_struct *, unsigned long, pte_t *, pte_t);
|
||||
|
||||
#define __HAVE_ARCH_PTEP_CLEAR_FLUSH
|
||||
static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
|
||||
unsigned long address, pte_t *ptep)
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
|
||||
}
|
||||
|
||||
pte = *ptep;
|
||||
ptep_flush_direct(vma->vm_mm, address, ptep);
|
||||
pte_val(*ptep) = _PAGE_INVALID;
|
||||
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) ==
|
||||
_PGSTE_GPS_USAGE_UNUSED)
|
||||
pte_val(pte) |= _PAGE_UNUSED;
|
||||
pgste = pgste_update_all(pte, pgste, vma->vm_mm);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
}
|
||||
return pte;
|
||||
return ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID));
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1205,80 +961,52 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
|
|||
*/
|
||||
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
|
||||
static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
|
||||
unsigned long address,
|
||||
unsigned long addr,
|
||||
pte_t *ptep, int full)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte;
|
||||
|
||||
if (!full && mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
|
||||
}
|
||||
|
||||
pte = *ptep;
|
||||
if (!full)
|
||||
ptep_flush_lazy(mm, address, ptep);
|
||||
pte_val(*ptep) = _PAGE_INVALID;
|
||||
|
||||
if (!full && mm_has_pgste(mm)) {
|
||||
pgste = pgste_update_all(pte, pgste, mm);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
}
|
||||
if (full) {
|
||||
pte_t pte = *ptep;
|
||||
*ptep = __pte(_PAGE_INVALID);
|
||||
return pte;
|
||||
}
|
||||
return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
||||
static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
|
||||
unsigned long address, pte_t *ptep)
|
||||
static inline void ptep_set_wrprotect(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t pte = *ptep;
|
||||
|
||||
if (pte_write(pte)) {
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(mm, address, ptep, pgste);
|
||||
}
|
||||
|
||||
ptep_flush_lazy(mm, address, ptep);
|
||||
pte = pte_wrprotect(pte);
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_set_pte(ptep, pgste, pte);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else
|
||||
*ptep = pte;
|
||||
}
|
||||
return pte;
|
||||
if (pte_write(pte))
|
||||
ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte));
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
|
||||
static inline int ptep_set_access_flags(struct vm_area_struct *vma,
|
||||
unsigned long address, pte_t *ptep,
|
||||
unsigned long addr, pte_t *ptep,
|
||||
pte_t entry, int dirty)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t oldpte;
|
||||
|
||||
oldpte = *ptep;
|
||||
if (pte_same(oldpte, entry))
|
||||
if (pte_same(*ptep, entry))
|
||||
return 0;
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(vma->vm_mm, address, ptep, pgste);
|
||||
ptep_xchg_direct(vma->vm_mm, addr, ptep, entry);
|
||||
return 1;
|
||||
}
|
||||
|
||||
ptep_flush_direct(vma->vm_mm, address, ptep);
|
||||
void set_pte_pgste_at(struct mm_struct *, unsigned long, pte_t *, pte_t);
|
||||
|
||||
if (mm_has_pgste(vma->vm_mm)) {
|
||||
if (pte_val(oldpte) & _PAGE_INVALID)
|
||||
pgste_set_key(ptep, pgste, entry, vma->vm_mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, entry);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else
|
||||
/*
|
||||
* Certain architectures need to do special things when PTEs
|
||||
* within a page table are directly modified. Thus, the following
|
||||
* hook is made available.
|
||||
*/
|
||||
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t entry)
|
||||
{
|
||||
if (mm_has_pgste(mm))
|
||||
set_pte_pgste_at(mm, addr, ptep, entry);
|
||||
else
|
||||
*ptep = entry;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -280,7 +280,7 @@ static void kvm_s390_sync_dirty_log(struct kvm *kvm,
|
|||
for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
|
||||
address = gfn_to_hva_memslot(memslot, cur_gfn);
|
||||
|
||||
if (gmap_test_and_clear_dirty(address, gmap))
|
||||
if (pgste_test_and_clear_dirty(gmap->mm, address))
|
||||
mark_page_dirty(kvm, cur_gfn);
|
||||
}
|
||||
up_read(&gmap->mm->mmap_sem);
|
||||
|
|
|
|||
|
|
@ -772,7 +772,7 @@ int gmap_ipte_notify(struct gmap *gmap, unsigned long gaddr, unsigned long len)
|
|||
EXPORT_SYMBOL_GPL(gmap_ipte_notify);
|
||||
|
||||
/**
|
||||
* gmap_do_ipte_notify - call all invalidation callbacks for a specific pte.
|
||||
* ptep_ipte_notify - call all invalidation callbacks for a specific pte.
|
||||
* @mm: pointer to the process mm_struct
|
||||
* @addr: virtual address in the process address space
|
||||
* @pte: pointer to the page table entry
|
||||
|
|
@ -780,7 +780,7 @@ EXPORT_SYMBOL_GPL(gmap_ipte_notify);
|
|||
* This function is assumed to be called with the page table lock held
|
||||
* for the pte to notify.
|
||||
*/
|
||||
void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
|
||||
void ptep_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
|
||||
{
|
||||
unsigned long offset, gaddr;
|
||||
unsigned long *table;
|
||||
|
|
@ -801,7 +801,7 @@ void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
|
|||
}
|
||||
spin_unlock(&gmap_notifier_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(gmap_do_ipte_notify);
|
||||
EXPORT_SYMBOL_GPL(ptep_ipte_notify);
|
||||
|
||||
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
|
||||
unsigned long key, bool nq)
|
||||
|
|
@ -1158,6 +1158,266 @@ static inline void thp_split_mm(struct mm_struct *mm)
|
|||
}
|
||||
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
||||
|
||||
static inline pte_t ptep_flush_direct(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
int active, count;
|
||||
pte_t old;
|
||||
|
||||
old = *ptep;
|
||||
if (unlikely(pte_val(old) & _PAGE_INVALID))
|
||||
return old;
|
||||
active = (mm == current->active_mm) ? 1 : 0;
|
||||
count = atomic_add_return(0x10000, &mm->context.attach_count);
|
||||
if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active &&
|
||||
cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id())))
|
||||
__ptep_ipte_local(addr, ptep);
|
||||
else
|
||||
__ptep_ipte(addr, ptep);
|
||||
atomic_sub(0x10000, &mm->context.attach_count);
|
||||
return old;
|
||||
}
|
||||
|
||||
static inline pte_t ptep_flush_lazy(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
int active, count;
|
||||
pte_t old;
|
||||
|
||||
old = *ptep;
|
||||
if (unlikely(pte_val(old) & _PAGE_INVALID))
|
||||
return old;
|
||||
active = (mm == current->active_mm) ? 1 : 0;
|
||||
count = atomic_add_return(0x10000, &mm->context.attach_count);
|
||||
if ((count & 0xffff) <= active) {
|
||||
pte_val(*ptep) |= _PAGE_INVALID;
|
||||
mm->context.flush_mm = 1;
|
||||
} else
|
||||
__ptep_ipte(addr, ptep);
|
||||
atomic_sub(0x10000, &mm->context.attach_count);
|
||||
return old;
|
||||
}
|
||||
|
||||
static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste,
|
||||
struct mm_struct *mm)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
unsigned long address, bits, skey;
|
||||
|
||||
if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID)
|
||||
return pgste;
|
||||
address = pte_val(pte) & PAGE_MASK;
|
||||
skey = (unsigned long) page_get_storage_key(address);
|
||||
bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
|
||||
/* Transfer page changed & referenced bit to guest bits in pgste */
|
||||
pgste_val(pgste) |= bits << 48; /* GR bit & GC bit */
|
||||
/* Copy page access key and fetch protection bit to pgste */
|
||||
pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT);
|
||||
pgste_val(pgste) |= (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
|
||||
#endif
|
||||
return pgste;
|
||||
|
||||
}
|
||||
|
||||
static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
|
||||
struct mm_struct *mm)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
unsigned long address;
|
||||
unsigned long nkey;
|
||||
|
||||
if (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID)
|
||||
return;
|
||||
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
|
||||
address = pte_val(entry) & PAGE_MASK;
|
||||
/*
|
||||
* Set page access key and fetch protection bit from pgste.
|
||||
* The guest C/R information is still in the PGSTE, set real
|
||||
* key C/R to 0.
|
||||
*/
|
||||
nkey = (pgste_val(pgste) & (PGSTE_ACC_BITS | PGSTE_FP_BIT)) >> 56;
|
||||
nkey |= (pgste_val(pgste) & (PGSTE_GR_BIT | PGSTE_GC_BIT)) >> 48;
|
||||
page_set_storage_key(address, nkey, 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline pgste_t pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
if ((pte_val(entry) & _PAGE_PRESENT) &&
|
||||
(pte_val(entry) & _PAGE_WRITE) &&
|
||||
!(pte_val(entry) & _PAGE_INVALID)) {
|
||||
if (!MACHINE_HAS_ESOP) {
|
||||
/*
|
||||
* Without enhanced suppression-on-protection force
|
||||
* the dirty bit on for all writable ptes.
|
||||
*/
|
||||
pte_val(entry) |= _PAGE_DIRTY;
|
||||
pte_val(entry) &= ~_PAGE_PROTECT;
|
||||
}
|
||||
if (!(pte_val(entry) & _PAGE_PROTECT))
|
||||
/* This pte allows write access, set user-dirty */
|
||||
pgste_val(pgste) |= PGSTE_UC_BIT;
|
||||
}
|
||||
#endif
|
||||
*ptep = entry;
|
||||
return pgste;
|
||||
}
|
||||
|
||||
static inline pgste_t pgste_ipte_notify(struct mm_struct *mm,
|
||||
unsigned long addr,
|
||||
pte_t *ptep, pgste_t pgste)
|
||||
{
|
||||
#ifdef CONFIG_PGSTE
|
||||
if (pgste_val(pgste) & PGSTE_IN_BIT) {
|
||||
pgste_val(pgste) &= ~PGSTE_IN_BIT;
|
||||
ptep_ipte_notify(mm, addr, ptep);
|
||||
}
|
||||
#endif
|
||||
return pgste;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PGSTE
|
||||
/*
|
||||
* Test and reset if a guest page is dirty
|
||||
*/
|
||||
bool pgste_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr)
|
||||
{
|
||||
spinlock_t *ptl;
|
||||
pgste_t pgste;
|
||||
pte_t *ptep;
|
||||
pte_t pte;
|
||||
bool dirty;
|
||||
|
||||
ptep = get_locked_pte(mm, addr, &ptl);
|
||||
if (unlikely(!ptep))
|
||||
return false;
|
||||
|
||||
pgste = pgste_get_lock(ptep);
|
||||
dirty = !!(pgste_val(pgste) & PGSTE_UC_BIT);
|
||||
pgste_val(pgste) &= ~PGSTE_UC_BIT;
|
||||
pte = *ptep;
|
||||
if (dirty && (pte_val(pte) & _PAGE_PRESENT)) {
|
||||
pgste = pgste_ipte_notify(mm, addr, ptep, pgste);
|
||||
__ptep_ipte(addr, ptep);
|
||||
if (MACHINE_HAS_ESOP || !(pte_val(pte) & _PAGE_WRITE))
|
||||
pte_val(pte) |= _PAGE_PROTECT;
|
||||
else
|
||||
pte_val(pte) |= _PAGE_INVALID;
|
||||
*ptep = pte;
|
||||
}
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
|
||||
spin_unlock(ptl);
|
||||
return dirty;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pgste_test_and_clear_dirty);
|
||||
|
||||
void set_pte_pgste_at(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t entry)
|
||||
{
|
||||
pgste_t pgste;
|
||||
|
||||
/* the mm_has_pgste() check is done in set_pte_at() */
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste_val(pgste) &= ~_PGSTE_GPS_ZERO;
|
||||
pgste_set_key(ptep, pgste, entry, mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, entry);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
}
|
||||
EXPORT_SYMBOL(set_pte_pgste_at);
|
||||
#endif
|
||||
|
||||
static inline pgste_t ptep_xchg_start(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste = __pgste(0);
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get_lock(ptep);
|
||||
pgste = pgste_ipte_notify(mm, addr, ptep, pgste);
|
||||
}
|
||||
return pgste;
|
||||
}
|
||||
|
||||
static inline void ptep_xchg_commit(struct mm_struct *mm,
|
||||
unsigned long addr, pte_t *ptep,
|
||||
pgste_t pgste, pte_t old, pte_t new)
|
||||
{
|
||||
if (mm_has_pgste(mm)) {
|
||||
if (pte_val(old) & _PAGE_INVALID)
|
||||
pgste_set_key(ptep, pgste, new, mm);
|
||||
if (pte_val(new) & _PAGE_INVALID) {
|
||||
pgste = pgste_update_all(old, pgste, mm);
|
||||
if ((pgste_val(pgste) & _PGSTE_GPS_USAGE_MASK) ==
|
||||
_PGSTE_GPS_USAGE_UNUSED)
|
||||
pte_val(old) |= _PAGE_UNUSED;
|
||||
}
|
||||
pgste = pgste_set_pte(ptep, pgste, new);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else {
|
||||
*ptep = new;
|
||||
}
|
||||
}
|
||||
|
||||
pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t new)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t old;
|
||||
|
||||
pgste = ptep_xchg_start(mm, addr, ptep);
|
||||
old = ptep_flush_direct(mm, addr, ptep);
|
||||
ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
|
||||
return old;
|
||||
}
|
||||
EXPORT_SYMBOL(ptep_xchg_direct);
|
||||
|
||||
pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t new)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t old;
|
||||
|
||||
pgste = ptep_xchg_start(mm, addr, ptep);
|
||||
old = ptep_flush_lazy(mm, addr, ptep);
|
||||
ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
|
||||
return old;
|
||||
}
|
||||
EXPORT_SYMBOL(ptep_xchg_lazy);
|
||||
|
||||
pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep)
|
||||
{
|
||||
pgste_t pgste;
|
||||
pte_t old;
|
||||
|
||||
pgste = ptep_xchg_start(mm, addr, ptep);
|
||||
old = ptep_flush_lazy(mm, addr, ptep);
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_update_all(old, pgste, mm);
|
||||
pgste_set(ptep, pgste);
|
||||
}
|
||||
return old;
|
||||
}
|
||||
EXPORT_SYMBOL(ptep_modify_prot_start);
|
||||
|
||||
void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
|
||||
pte_t *ptep, pte_t pte)
|
||||
{
|
||||
pgste_t pgste;
|
||||
|
||||
if (mm_has_pgste(mm)) {
|
||||
pgste = pgste_get(ptep);
|
||||
pgste_set_key(ptep, pgste, pte, mm);
|
||||
pgste = pgste_set_pte(ptep, pgste, pte);
|
||||
pgste_set_unlock(ptep, pgste);
|
||||
} else {
|
||||
*ptep = pte;
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(ptep_modify_prot_commit);
|
||||
|
||||
/*
|
||||
* switch on pgstes for its userspace process (for kvm)
|
||||
*/
|
||||
|
|
@ -1190,17 +1450,15 @@ static int __s390_enable_skey(pte_t *pte, unsigned long addr,
|
|||
unsigned long ptev;
|
||||
pgste_t pgste;
|
||||
|
||||
pgste = pgste_get_lock(pte);
|
||||
/*
|
||||
* Remove all zero page mappings,
|
||||
* after establishing a policy to forbid zero page mappings
|
||||
* following faults for that page will get fresh anonymous pages
|
||||
*/
|
||||
if (is_zero_pfn(pte_pfn(*pte))) {
|
||||
ptep_flush_direct(walk->mm, addr, pte);
|
||||
pte_val(*pte) = _PAGE_INVALID;
|
||||
}
|
||||
if (is_zero_pfn(pte_pfn(*pte)))
|
||||
ptep_xchg_direct(walk->mm, addr, pte, __pte(_PAGE_INVALID));
|
||||
/* Clear storage key */
|
||||
pgste = pgste_get_lock(pte);
|
||||
pgste_val(pgste) &= ~(PGSTE_ACC_BITS | PGSTE_FP_BIT |
|
||||
PGSTE_GR_BIT | PGSTE_GC_BIT);
|
||||
ptev = pte_val(*pte);
|
||||
|
|
@ -1266,27 +1524,6 @@ void s390_reset_cmma(struct mm_struct *mm)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(s390_reset_cmma);
|
||||
|
||||
/*
|
||||
* Test and reset if a guest page is dirty
|
||||
*/
|
||||
bool gmap_test_and_clear_dirty(unsigned long address, struct gmap *gmap)
|
||||
{
|
||||
pte_t *pte;
|
||||
spinlock_t *ptl;
|
||||
bool dirty = false;
|
||||
|
||||
pte = get_locked_pte(gmap->mm, address, &ptl);
|
||||
if (unlikely(!pte))
|
||||
return false;
|
||||
|
||||
if (ptep_test_and_clear_user_dirty(gmap->mm, address, pte))
|
||||
dirty = true;
|
||||
|
||||
spin_unlock(ptl);
|
||||
return dirty;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(gmap_test_and_clear_dirty);
|
||||
|
||||
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
||||
int pmdp_clear_flush_young(struct vm_area_struct *vma, unsigned long address,
|
||||
pmd_t *pmdp)
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче