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[S390] kvm guest address space mapping

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Add code that allows KVM to control the virtual memory layout that
is seen by a guest. The guest address space uses a second page table
that shares the last level pte-tables with the process page table.
If a page is unmapped from the process page table it is automatically
unmapped from the guest page table as well.

The guest address space mapping starts out empty, KVM can map any
individual 1MB segments from the process virtual memory to any 1MB
aligned location in the guest virtual memory. If a target segment in
the process virtual memory does not exist or is unmapped while a
guest mapping exists the desired target address is stored as an
invalid segment table entry in the guest page table.
The population of the guest page table is fault driven.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2011-07-24 10:48:20 +02:00
parent 144d634a21
commit e5992f2e6c
11 changed files with 489 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/s390/include/asm/lowcore.h
View File

@ -268,7 +268,7 @@ struct _lowcore {
__u64 vdso_per_cpu_data; /* 0x0358 */
__u64 machine_flags; /* 0x0360 */
__u64 ftrace_func; /* 0x0368 */
__u64 sie_hook; /* 0x0370 */
__u64 gmap; /* 0x0370 */
__u64 cmf_hpp; /* 0x0378 */
/* Interrupt response block. */

4
arch/s390/include/asm/mmu.h
View File

@ -6,6 +6,7 @@ typedef struct {
unsigned int flush_mm;
spinlock_t list_lock;
struct list_head pgtable_list;
struct list_head gmap_list;
unsigned long asce_bits;
unsigned long asce_limit;
unsigned long vdso_base;
@ -17,6 +18,7 @@ typedef struct {
#define INIT_MM_CONTEXT(name) \
.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \
.context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list),
#endif

7
arch/s390/include/asm/pgalloc.h
View File

@ -20,7 +20,7 @@
unsigned long *crst_table_alloc(struct mm_struct *);
void crst_table_free(struct mm_struct *, unsigned long *);
unsigned long *page_table_alloc(struct mm_struct *);
unsigned long *page_table_alloc(struct mm_struct *, unsigned long);
void page_table_free(struct mm_struct *, unsigned long *);
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
void page_table_free_rcu(struct mmu_gather *, unsigned long *);
@ -115,6 +115,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
spin_lock_init(&mm->context.list_lock);
INIT_LIST_HEAD(&mm->context.pgtable_list);
INIT_LIST_HEAD(&mm->context.gmap_list);
return (pgd_t *) crst_table_alloc(mm);
}
#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
@ -133,8 +134,8 @@ static inline void pmd_populate(struct mm_struct *mm,
/*
* page table entry allocation/free routines.
*/
#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr))
#define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
#define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)

42
arch/s390/include/asm/pgtable.h
View File

@ -654,6 +654,48 @@ static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste)
#endif
}
/**
* struct gmap_struct - guest address space
* @mm: pointer to the parent mm_struct
* @table: pointer to the page directory
* @crst_list: list of all crst tables used in the guest address space
*/
struct gmap {
struct list_head list;
struct mm_struct *mm;
unsigned long *table;
struct list_head crst_list;
};
/**
* struct gmap_rmap - reverse mapping for segment table entries
* @next: pointer to the next gmap_rmap structure in the list
* @entry: pointer to a segment table entry
*/
struct gmap_rmap {
struct list_head list;
unsigned long *entry;
};
/**
* struct gmap_pgtable - gmap information attached to a page table
* @vmaddr: address of the 1MB segment in the process virtual memory
* @mapper: list of segment table entries maping a page table
*/
struct gmap_pgtable {
unsigned long vmaddr;
struct list_head mapper;
};
struct gmap *gmap_alloc(struct mm_struct *mm);
void gmap_free(struct gmap *gmap);
void gmap_enable(struct gmap *gmap);
void gmap_disable(struct gmap *gmap);
int gmap_map_segment(struct gmap *gmap, unsigned long from,
unsigned long to, unsigned long length);
int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
unsigned long gmap_fault(unsigned long address, struct gmap *);
/*
* Certain architectures need to do special things when PTEs
* within a page table are directly modified. Thus, the following

1
arch/s390/include/asm/processor.h
View File

@ -80,6 +80,7 @@ struct thread_struct {
mm_segment_t mm_segment;
unsigned long prot_addr; /* address of protection-excep. */
unsigned int trap_no;
unsigned long gmap_addr; /* address of last gmap fault. */
struct per_regs per_user; /* User specified PER registers */
struct per_event per_event; /* Cause of the last PER trap */
/* pfault_wait is used to block the process on a pfault event */

2
arch/s390/include/asm/tlbflush.h
View File

@ -80,7 +80,7 @@ static inline void __tlb_flush_mm(struct mm_struct * mm)
* on all cpus instead of doing a local flush if the mm
* only ran on the local cpu.
*/
if (MACHINE_HAS_IDTE)
if (MACHINE_HAS_IDTE && list_empty(&mm->context.gmap_list))
__tlb_flush_idte((unsigned long) mm->pgd |
mm->context.asce_bits);
else

2
arch/s390/kernel/asm-offsets.c
View File

@ -151,7 +151,7 @@ int main(void)
DEFINE(__LC_FP_CREG_SAVE_AREA, offsetof(struct _lowcore, fpt_creg_save_area));
DEFINE(__LC_LAST_BREAK, offsetof(struct _lowcore, breaking_event_addr));
DEFINE(__LC_VDSO_PER_CPU, offsetof(struct _lowcore, vdso_per_cpu_data));
DEFINE(__LC_SIE_HOOK, offsetof(struct _lowcore, sie_hook));
DEFINE(__LC_GMAP, offsetof(struct _lowcore, gmap));
DEFINE(__LC_CMF_HPP, offsetof(struct _lowcore, cmf_hpp));
#endif /* CONFIG_32BIT */
return 0;

18
arch/s390/mm/fault.c
View File

@ -303,9 +303,24 @@ static inline int do_exception(struct pt_regs *regs, int access,
flags = FAULT_FLAG_ALLOW_RETRY;
if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400)
flags |= FAULT_FLAG_WRITE;
retry:
down_read(&mm->mmap_sem);
#ifdef CONFIG_PGSTE
if (test_tsk_thread_flag(current, TIF_SIE) && S390_lowcore.gmap) {
address = gmap_fault(address,
(struct gmap *) S390_lowcore.gmap);
if (address == -EFAULT) {
fault = VM_FAULT_BADMAP;
goto out_up;
}
if (address == -ENOMEM) {
fault = VM_FAULT_OOM;
goto out_up;
}
}
#endif
retry:
fault = VM_FAULT_BADMAP;
vma = find_vma(mm, address);
if (!vma)
@ -356,6 +371,7 @@ retry:
/* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk
* of starvation. */
flags &= ~FAULT_FLAG_ALLOW_RETRY;
down_read(&mm->mmap_sem);
goto retry;
}
}

2
arch/s390/mm/hugetlbpage.c
View File

@ -35,7 +35,7 @@ int arch_prepare_hugepage(struct page *page)
if (MACHINE_HAS_HPAGE)
return 0;
ptep = (pte_t *) pte_alloc_one(&init_mm, address);
ptep = (pte_t *) pte_alloc_one(&init_mm, addr);
if (!ptep)
return -ENOMEM;

453
arch/s390/mm/pgtable.c
View File

@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/quicklist.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <asm/system.h>
#include <asm/pgtable.h>
@ -133,6 +134,413 @@ void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
}
#endif
#ifdef CONFIG_PGSTE
/**
* gmap_alloc - allocate a guest address space
* @mm: pointer to the parent mm_struct
*
* Returns a guest address space structure.
*/
struct gmap *gmap_alloc(struct mm_struct *mm)
{
struct gmap *gmap;
struct page *page;
unsigned long *table;
gmap = kzalloc(sizeof(struct gmap), GFP_KERNEL);
if (!gmap)
goto out;
INIT_LIST_HEAD(&gmap->crst_list);
gmap->mm = mm;
page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
if (!page)
goto out_free;
list_add(&page->lru, &gmap->crst_list);
table = (unsigned long *) page_to_phys(page);
crst_table_init(table, _REGION1_ENTRY_EMPTY);
gmap->table = table;
list_add(&gmap->list, &mm->context.gmap_list);
return gmap;
out_free:
kfree(gmap);
out:
return NULL;
}
EXPORT_SYMBOL_GPL(gmap_alloc);
static int gmap_unlink_segment(struct gmap *gmap, unsigned long *table)
{
struct gmap_pgtable *mp;
struct gmap_rmap *rmap;
struct page *page;
if (*table & _SEGMENT_ENTRY_INV)
return 0;
page = pfn_to_page(*table >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
list_for_each_entry(rmap, &mp->mapper, list) {
if (rmap->entry != table)
continue;
list_del(&rmap->list);
kfree(rmap);
break;
}
*table = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO | mp->vmaddr;
return 1;
}
static void gmap_flush_tlb(struct gmap *gmap)
{
if (MACHINE_HAS_IDTE)
__tlb_flush_idte((unsigned long) gmap->table |
_ASCE_TYPE_REGION1);
else
__tlb_flush_global();
}
/**
* gmap_free - free a guest address space
* @gmap: pointer to the guest address space structure
*/
void gmap_free(struct gmap *gmap)
{
struct page *page, *next;
unsigned long *table;
int i;
/* Flush tlb. */
if (MACHINE_HAS_IDTE)
__tlb_flush_idte((unsigned long) gmap->table |
_ASCE_TYPE_REGION1);
else
__tlb_flush_global();
/* Free all segment & region tables. */
down_read(&gmap->mm->mmap_sem);
list_for_each_entry_safe(page, next, &gmap->crst_list, lru) {
table = (unsigned long *) page_to_phys(page);
if ((*table & _REGION_ENTRY_TYPE_MASK) == 0)
/* Remove gmap rmap structures for segment table. */
for (i = 0; i < PTRS_PER_PMD; i++, table++)
gmap_unlink_segment(gmap, table);
__free_pages(page, ALLOC_ORDER);
}
up_read(&gmap->mm->mmap_sem);
list_del(&gmap->list);
kfree(gmap);
}
EXPORT_SYMBOL_GPL(gmap_free);
/**
* gmap_enable - switch primary space to the guest address space
* @gmap: pointer to the guest address space structure
*/
void gmap_enable(struct gmap *gmap)
{
/* Load primary space page table origin. */
S390_lowcore.user_asce = _ASCE_TYPE_REGION1 | _ASCE_TABLE_LENGTH |
_ASCE_USER_BITS | __pa(gmap->table);
asm volatile("lctlg 1,1,%0\n" : : "m" (S390_lowcore.user_asce) );
S390_lowcore.gmap = (unsigned long) gmap;
}
EXPORT_SYMBOL_GPL(gmap_enable);
/**
* gmap_disable - switch back to the standard primary address space
* @gmap: pointer to the guest address space structure
*/
void gmap_disable(struct gmap *gmap)
{
/* Load primary space page table origin. */
S390_lowcore.user_asce =
gmap->mm->context.asce_bits | __pa(gmap->mm->pgd);
asm volatile("lctlg 1,1,%0\n" : : "m" (S390_lowcore.user_asce) );
S390_lowcore.gmap = 0UL;
}
EXPORT_SYMBOL_GPL(gmap_disable);
static int gmap_alloc_table(struct gmap *gmap,
unsigned long *table, unsigned long init)
{
struct page *page;
unsigned long *new;
page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
if (!page)
return -ENOMEM;
new = (unsigned long *) page_to_phys(page);
crst_table_init(new, init);
down_read(&gmap->mm->mmap_sem);
if (*table & _REGION_ENTRY_INV) {
list_add(&page->lru, &gmap->crst_list);
*table = (unsigned long) new | _REGION_ENTRY_LENGTH |
(*table & _REGION_ENTRY_TYPE_MASK);
} else
__free_pages(page, ALLOC_ORDER);
up_read(&gmap->mm->mmap_sem);
return 0;
}
/**
* gmap_unmap_segment - unmap segment from the guest address space
* @gmap: pointer to the guest address space structure
* @addr: address in the guest address space
* @len: length of the memory area to unmap
*
* Returns 0 if the unmap succeded, -EINVAL if not.
*/
int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len)
{
unsigned long *table;
unsigned long off;
int flush;
if ((to | len) & (PMD_SIZE - 1))
return -EINVAL;
if (len == 0 || to + len < to)
return -EINVAL;
flush = 0;
down_read(&gmap->mm->mmap_sem);
for (off = 0; off < len; off += PMD_SIZE) {
/* Walk the guest addr space page table */
table = gmap->table + (((to + off) >> 53) & 0x7ff);
if (*table & _REGION_ENTRY_INV)
return 0;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 42) & 0x7ff);
if (*table & _REGION_ENTRY_INV)
return 0;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 31) & 0x7ff);
if (*table & _REGION_ENTRY_INV)
return 0;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 20) & 0x7ff);
/* Clear segment table entry in guest address space. */
flush |= gmap_unlink_segment(gmap, table);
*table = _SEGMENT_ENTRY_INV;
}
up_read(&gmap->mm->mmap_sem);
if (flush)
gmap_flush_tlb(gmap);
return 0;
}
EXPORT_SYMBOL_GPL(gmap_unmap_segment);
/**
* gmap_mmap_segment - map a segment to the guest address space
* @gmap: pointer to the guest address space structure
* @from: source address in the parent address space
* @to: target address in the guest address space
*
* Returns 0 if the mmap succeded, -EINVAL or -ENOMEM if not.
*/
int gmap_map_segment(struct gmap *gmap, unsigned long from,
unsigned long to, unsigned long len)
{
unsigned long *table;
unsigned long off;
int flush;
if ((from | to | len) & (PMD_SIZE - 1))
return -EINVAL;
if (len == 0 || from + len > PGDIR_SIZE ||
from + len < from || to + len < to)
return -EINVAL;
flush = 0;
down_read(&gmap->mm->mmap_sem);
for (off = 0; off < len; off += PMD_SIZE) {
/* Walk the gmap address space page table */
table = gmap->table + (((to + off) >> 53) & 0x7ff);
if ((*table & _REGION_ENTRY_INV) &&
gmap_alloc_table(gmap, table, _REGION2_ENTRY_EMPTY))
goto out_unmap;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 42) & 0x7ff);
if ((*table & _REGION_ENTRY_INV) &&
gmap_alloc_table(gmap, table, _REGION3_ENTRY_EMPTY))
goto out_unmap;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 31) & 0x7ff);
if ((*table & _REGION_ENTRY_INV) &&
gmap_alloc_table(gmap, table, _SEGMENT_ENTRY_EMPTY))
goto out_unmap;
table = (unsigned long *) (*table & _REGION_ENTRY_ORIGIN);
table = table + (((to + off) >> 20) & 0x7ff);
/* Store 'from' address in an invalid segment table entry. */
flush |= gmap_unlink_segment(gmap, table);
*table = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO | (from + off);
}
up_read(&gmap->mm->mmap_sem);
if (flush)
gmap_flush_tlb(gmap);
return 0;
out_unmap:
up_read(&gmap->mm->mmap_sem);
gmap_unmap_segment(gmap, to, len);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(gmap_map_segment);
unsigned long gmap_fault(unsigned long address, struct gmap *gmap)
{
unsigned long *table, vmaddr, segment;
struct mm_struct *mm;
struct gmap_pgtable *mp;
struct gmap_rmap *rmap;
struct vm_area_struct *vma;
struct page *page;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
current->thread.gmap_addr = address;
mm = gmap->mm;
/* Walk the gmap address space page table */
table = gmap->table + ((address >> 53) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -EFAULT;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 42) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -EFAULT;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 31) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
return -EFAULT;
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 20) & 0x7ff);
/* Convert the gmap address to an mm address. */
segment = *table;
if (likely(!(segment & _SEGMENT_ENTRY_INV))) {
page = pfn_to_page(segment >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
return mp->vmaddr | (address & ~PMD_MASK);
} else if (segment & _SEGMENT_ENTRY_RO) {
vmaddr = segment & _SEGMENT_ENTRY_ORIGIN;
vma = find_vma(mm, vmaddr);
if (!vma || vma->vm_start > vmaddr)
return -EFAULT;
/* Walk the parent mm page table */
pgd = pgd_offset(mm, vmaddr);
pud = pud_alloc(mm, pgd, vmaddr);
if (!pud)
return -ENOMEM;
pmd = pmd_alloc(mm, pud, vmaddr);
if (!pmd)
return -ENOMEM;
if (!pmd_present(*pmd) &&
__pte_alloc(mm, vma, pmd, vmaddr))
return -ENOMEM;
/* pmd now points to a valid segment table entry. */
rmap = kmalloc(sizeof(*rmap), GFP_KERNEL|__GFP_REPEAT);
if (!rmap)
return -ENOMEM;
/* Link gmap segment table entry location to page table. */
page = pmd_page(*pmd);
mp = (struct gmap_pgtable *) page->index;
rmap->entry = table;
list_add(&rmap->list, &mp->mapper);
/* Set gmap segment table entry to page table. */
*table = pmd_val(*pmd) & PAGE_MASK;
return vmaddr | (address & ~PMD_MASK);
}
return -EFAULT;
}
EXPORT_SYMBOL_GPL(gmap_fault);
void gmap_unmap_notifier(struct mm_struct *mm, unsigned long *table)
{
struct gmap_rmap *rmap, *next;
struct gmap_pgtable *mp;
struct page *page;
int flush;
flush = 0;
spin_lock(&mm->page_table_lock);
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
list_for_each_entry_safe(rmap, next, &mp->mapper, list) {
*rmap->entry =
_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO | mp->vmaddr;
list_del(&rmap->list);
kfree(rmap);
flush = 1;
}
spin_unlock(&mm->page_table_lock);
if (flush)
__tlb_flush_global();
}
static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm,
unsigned long vmaddr)
{
struct page *page;
unsigned long *table;
struct gmap_pgtable *mp;
page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
if (!page)
return NULL;
mp = kmalloc(sizeof(*mp), GFP_KERNEL|__GFP_REPEAT);
if (!mp) {
__free_page(page);
return NULL;
}
pgtable_page_ctor(page);
mp->vmaddr = vmaddr & PMD_MASK;
INIT_LIST_HEAD(&mp->mapper);
page->index = (unsigned long) mp;
atomic_set(&page->_mapcount, 3);
table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE/2);
clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
return table;
}
static inline void page_table_free_pgste(unsigned long *table)
{
struct page *page;
struct gmap_pgtable *mp;
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
BUG_ON(!list_empty(&mp->mapper));
pgtable_page_ctor(page);
atomic_set(&page->_mapcount, -1);
kfree(mp);
__free_page(page);
}
#else /* CONFIG_PGSTE */
static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm,
unsigned long vmaddr)
{
}
static inline void page_table_free_pgste(unsigned long *table)
{
}
static inline void gmap_unmap_notifier(struct mm_struct *mm,
unsigned long *table)
{
}
#endif /* CONFIG_PGSTE */
static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits)
{
unsigned int old, new;
@ -147,44 +555,14 @@ static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits)
/*
* page table entry allocation/free routines.
*/
#ifdef CONFIG_PGSTE
static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm)
{
struct page *page;
unsigned long *table;
page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
if (!page)
return NULL;
pgtable_page_ctor(page);
atomic_set(&page->_mapcount, 3);
table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE/2);
clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
return table;
}
static inline void page_table_free_pgste(unsigned long *table)
{
struct page *page;
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
pgtable_page_ctor(page);
atomic_set(&page->_mapcount, -1);
__free_page(page);
}
#endif
unsigned long *page_table_alloc(struct mm_struct *mm)
unsigned long *page_table_alloc(struct mm_struct *mm, unsigned long vmaddr)
{
struct page *page;
unsigned long *table;
unsigned int mask, bit;
#ifdef CONFIG_PGSTE
if (mm_has_pgste(mm))
return page_table_alloc_pgste(mm);
#endif
return page_table_alloc_pgste(mm, vmaddr);
/* Allocate fragments of a 4K page as 1K/2K page table */
spin_lock_bh(&mm->context.list_lock);
mask = FRAG_MASK;
@ -222,10 +600,10 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
struct page *page;
unsigned int bit, mask;
#ifdef CONFIG_PGSTE
if (mm_has_pgste(mm))
if (mm_has_pgste(mm)) {
gmap_unmap_notifier(mm, table);
return page_table_free_pgste(table);
#endif
}
/* Free 1K/2K page table fragment of a 4K page */
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
bit = 1 << ((__pa(table) & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t)));
@ -249,10 +627,8 @@ static void __page_table_free_rcu(void *table, unsigned bit)
{
struct page *page;
#ifdef CONFIG_PGSTE
if (bit == FRAG_MASK)
return page_table_free_pgste(table);
#endif
/* Free 1K/2K page table fragment of a 4K page */
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
if (atomic_xor_bits(&page->_mapcount, bit) == 0) {
@ -269,13 +645,12 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table)
unsigned int bit, mask;
mm = tlb->mm;
#ifdef CONFIG_PGSTE
if (mm_has_pgste(mm)) {
gmap_unmap_notifier(mm, table);
table = (unsigned long *) (__pa(table) | FRAG_MASK);
tlb_remove_table(tlb, table);
return;
}
#endif
bit = 1 << ((__pa(table) & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t)));
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
spin_lock_bh(&mm->context.list_lock);

8
arch/s390/mm/vmem.c
View File

@ -61,12 +61,12 @@ static inline pmd_t *vmem_pmd_alloc(void)
return pmd;
}
static pte_t __ref *vmem_pte_alloc(void)
static pte_t __ref *vmem_pte_alloc(unsigned long address)
{
pte_t *pte;
if (slab_is_available())
pte = (pte_t *) page_table_alloc(&init_mm);
pte = (pte_t *) page_table_alloc(&init_mm, address);
else
pte = alloc_bootmem(PTRS_PER_PTE * sizeof(pte_t));
if (!pte)
@ -120,7 +120,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
}
#endif
if (pmd_none(*pm_dir)) {
pt_dir = vmem_pte_alloc();
pt_dir = vmem_pte_alloc(address);
if (!pt_dir)
goto out;
pmd_populate(&init_mm, pm_dir, pt_dir);
@ -205,7 +205,7 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
pm_dir = pmd_offset(pu_dir, address);
if (pmd_none(*pm_dir)) {
pt_dir = vmem_pte_alloc();
pt_dir = vmem_pte_alloc(address);
if (!pt_dir)
goto out;
pmd_populate(&init_mm, pm_dir, pt_dir);