605 lines
13 KiB
C
605 lines
13 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/sched/signal.h>
|
||
|
|
|
||
|
|
#include <asm/tlbflush.h>
|
||
|
|
#include <as-layout.h>
|
||
|
|
#include <mem_user.h>
|
||
|
|
#include <os.h>
|
||
|
|
#include <skas.h>
|
||
|
|
#include <kern_util.h>
|
||
|
|
|
||
|
|
struct host_vm_change {
|
||
|
|
struct host_vm_op {
|
||
|
|
enum { NONE, MMAP, MUNMAP, MPROTECT } type;
|
||
|
|
union {
|
||
|
|
struct {
|
||
|
|
unsigned long addr;
|
||
|
|
unsigned long len;
|
||
|
|
unsigned int prot;
|
||
|
|
int fd;
|
||
|
|
__u64 offset;
|
||
|
|
} mmap;
|
||
|
|
struct {
|
||
|
|
unsigned long addr;
|
||
|
|
unsigned long len;
|
||
|
|
} munmap;
|
||
|
|
struct {
|
||
|
|
unsigned long addr;
|
||
|
|
unsigned long len;
|
||
|
|
unsigned int prot;
|
||
|
|
} mprotect;
|
||
|
|
} u;
|
||
|
|
} ops[1];
|
||
|
|
int userspace;
|
||
|
|
int index;
|
||
|
|
struct mm_struct *mm;
|
||
|
|
void *data;
|
||
|
|
int force;
|
||
|
|
};
|
||
|
|
|
||
|
|
#define INIT_HVC(mm, force, userspace) \
|
||
|
|
((struct host_vm_change) \
|
||
|
|
{ .ops = { { .type = NONE } }, \
|
||
|
|
.mm = mm, \
|
||
|
|
.data = NULL, \
|
||
|
|
.userspace = userspace, \
|
||
|
|
.index = 0, \
|
||
|
|
.force = force })
|
||
|
|
|
||
|
|
static void report_enomem(void)
|
||
|
|
{
|
||
|
|
printk(KERN_ERR "UML ran out of memory on the host side! "
|
||
|
|
"This can happen due to a memory limitation or "
|
||
|
|
"vm.max_map_count has been reached.\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
static int do_ops(struct host_vm_change *hvc, int end,
|
||
|
|
int finished)
|
||
|
|
{
|
||
|
|
struct host_vm_op *op;
|
||
|
|
int i, ret = 0;
|
||
|
|
|
||
|
|
for (i = 0; i < end && !ret; i++) {
|
||
|
|
op = &hvc->ops[i];
|
||
|
|
switch (op->type) {
|
||
|
|
case MMAP:
|
||
|
|
if (hvc->userspace)
|
||
|
|
ret = map(&hvc->mm->context.id, op->u.mmap.addr,
|
||
|
|
op->u.mmap.len, op->u.mmap.prot,
|
||
|
|
op->u.mmap.fd,
|
||
|
|
op->u.mmap.offset, finished,
|
||
|
|
&hvc->data);
|
||
|
|
else
|
||
|
|
map_memory(op->u.mmap.addr, op->u.mmap.offset,
|
||
|
|
op->u.mmap.len, 1, 1, 1);
|
||
|
|
break;
|
||
|
|
case MUNMAP:
|
||
|
|
if (hvc->userspace)
|
||
|
|
ret = unmap(&hvc->mm->context.id,
|
||
|
|
op->u.munmap.addr,
|
||
|
|
op->u.munmap.len, finished,
|
||
|
|
&hvc->data);
|
||
|
|
else
|
||
|
|
ret = os_unmap_memory(
|
||
|
|
(void *) op->u.munmap.addr,
|
||
|
|
op->u.munmap.len);
|
||
|
|
|
||
|
|
break;
|
||
|
|
case MPROTECT:
|
||
|
|
if (hvc->userspace)
|
||
|
|
ret = protect(&hvc->mm->context.id,
|
||
|
|
op->u.mprotect.addr,
|
||
|
|
op->u.mprotect.len,
|
||
|
|
op->u.mprotect.prot,
|
||
|
|
finished, &hvc->data);
|
||
|
|
else
|
||
|
|
ret = os_protect_memory(
|
||
|
|
(void *) op->u.mprotect.addr,
|
||
|
|
op->u.mprotect.len,
|
||
|
|
1, 1, 1);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
printk(KERN_ERR "Unknown op type %d in do_ops\n",
|
||
|
|
op->type);
|
||
|
|
BUG();
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ret == -ENOMEM)
|
||
|
|
report_enomem();
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
|
||
|
|
unsigned int prot, struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
__u64 offset;
|
||
|
|
struct host_vm_op *last;
|
||
|
|
int fd = -1, ret = 0;
|
||
|
|
|
||
|
|
if (hvc->userspace)
|
||
|
|
fd = phys_mapping(phys, &offset);
|
||
|
|
else
|
||
|
|
offset = phys;
|
||
|
|
if (hvc->index != 0) {
|
||
|
|
last = &hvc->ops[hvc->index - 1];
|
||
|
|
if ((last->type == MMAP) &&
|
||
|
|
(last->u.mmap.addr + last->u.mmap.len == virt) &&
|
||
|
|
(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
|
||
|
|
(last->u.mmap.offset + last->u.mmap.len == offset)) {
|
||
|
|
last->u.mmap.len += len;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hvc->index == ARRAY_SIZE(hvc->ops)) {
|
||
|
|
ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
|
||
|
|
hvc->index = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
hvc->ops[hvc->index++] = ((struct host_vm_op)
|
||
|
|
{ .type = MMAP,
|
||
|
|
.u = { .mmap = { .addr = virt,
|
||
|
|
.len = len,
|
||
|
|
.prot = prot,
|
||
|
|
.fd = fd,
|
||
|
|
.offset = offset }
|
||
|
|
} });
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_munmap(unsigned long addr, unsigned long len,
|
||
|
|
struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
struct host_vm_op *last;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
if (hvc->index != 0) {
|
||
|
|
last = &hvc->ops[hvc->index - 1];
|
||
|
|
if ((last->type == MUNMAP) &&
|
||
|
|
(last->u.munmap.addr + last->u.mmap.len == addr)) {
|
||
|
|
last->u.munmap.len += len;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hvc->index == ARRAY_SIZE(hvc->ops)) {
|
||
|
|
ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
|
||
|
|
hvc->index = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
hvc->ops[hvc->index++] = ((struct host_vm_op)
|
||
|
|
{ .type = MUNMAP,
|
||
|
|
.u = { .munmap = { .addr = addr,
|
||
|
|
.len = len } } });
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_mprotect(unsigned long addr, unsigned long len,
|
||
|
|
unsigned int prot, struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
struct host_vm_op *last;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
if (hvc->index != 0) {
|
||
|
|
last = &hvc->ops[hvc->index - 1];
|
||
|
|
if ((last->type == MPROTECT) &&
|
||
|
|
(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
|
||
|
|
(last->u.mprotect.prot == prot)) {
|
||
|
|
last->u.mprotect.len += len;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hvc->index == ARRAY_SIZE(hvc->ops)) {
|
||
|
|
ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
|
||
|
|
hvc->index = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
hvc->ops[hvc->index++] = ((struct host_vm_op)
|
||
|
|
{ .type = MPROTECT,
|
||
|
|
.u = { .mprotect = { .addr = addr,
|
||
|
|
.len = len,
|
||
|
|
.prot = prot } } });
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
|
||
|
|
|
||
|
|
static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
|
||
|
|
unsigned long end,
|
||
|
|
struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
pte_t *pte;
|
||
|
|
int r, w, x, prot, ret = 0;
|
||
|
|
|
||
|
|
pte = pte_offset_kernel(pmd, addr);
|
||
|
|
do {
|
||
|
|
r = pte_read(*pte);
|
||
|
|
w = pte_write(*pte);
|
||
|
|
x = pte_exec(*pte);
|
||
|
|
if (!pte_young(*pte)) {
|
||
|
|
r = 0;
|
||
|
|
w = 0;
|
||
|
|
} else if (!pte_dirty(*pte))
|
||
|
|
w = 0;
|
||
|
|
|
||
|
|
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
|
||
|
|
(x ? UM_PROT_EXEC : 0));
|
||
|
|
if (hvc->force || pte_newpage(*pte)) {
|
||
|
|
if (pte_present(*pte)) {
|
||
|
|
if (pte_newpage(*pte))
|
||
|
|
ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
|
||
|
|
PAGE_SIZE, prot, hvc);
|
||
|
|
} else
|
||
|
|
ret = add_munmap(addr, PAGE_SIZE, hvc);
|
||
|
|
} else if (pte_newprot(*pte))
|
||
|
|
ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
|
||
|
|
*pte = pte_mkuptodate(*pte);
|
||
|
|
} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int update_pmd_range(pud_t *pud, unsigned long addr,
|
||
|
|
unsigned long end,
|
||
|
|
struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
pmd_t *pmd;
|
||
|
|
unsigned long next;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
pmd = pmd_offset(pud, addr);
|
||
|
|
do {
|
||
|
|
next = pmd_addr_end(addr, end);
|
||
|
|
if (!pmd_present(*pmd)) {
|
||
|
|
if (hvc->force || pmd_newpage(*pmd)) {
|
||
|
|
ret = add_munmap(addr, next - addr, hvc);
|
||
|
|
pmd_mkuptodate(*pmd);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else ret = update_pte_range(pmd, addr, next, hvc);
|
||
|
|
} while (pmd++, addr = next, ((addr < end) && !ret));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int update_pud_range(p4d_t *p4d, unsigned long addr,
|
||
|
|
unsigned long end,
|
||
|
|
struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
pud_t *pud;
|
||
|
|
unsigned long next;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
pud = pud_offset(p4d, addr);
|
||
|
|
do {
|
||
|
|
next = pud_addr_end(addr, end);
|
||
|
|
if (!pud_present(*pud)) {
|
||
|
|
if (hvc->force || pud_newpage(*pud)) {
|
||
|
|
ret = add_munmap(addr, next - addr, hvc);
|
||
|
|
pud_mkuptodate(*pud);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else ret = update_pmd_range(pud, addr, next, hvc);
|
||
|
|
} while (pud++, addr = next, ((addr < end) && !ret));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int update_p4d_range(pgd_t *pgd, unsigned long addr,
|
||
|
|
unsigned long end,
|
||
|
|
struct host_vm_change *hvc)
|
||
|
|
{
|
||
|
|
p4d_t *p4d;
|
||
|
|
unsigned long next;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
p4d = p4d_offset(pgd, addr);
|
||
|
|
do {
|
||
|
|
next = p4d_addr_end(addr, end);
|
||
|
|
if (!p4d_present(*p4d)) {
|
||
|
|
if (hvc->force || p4d_newpage(*p4d)) {
|
||
|
|
ret = add_munmap(addr, next - addr, hvc);
|
||
|
|
p4d_mkuptodate(*p4d);
|
||
|
|
}
|
||
|
|
} else
|
||
|
|
ret = update_pud_range(p4d, addr, next, hvc);
|
||
|
|
} while (p4d++, addr = next, ((addr < end) && !ret));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
|
||
|
|
unsigned long end_addr, int force)
|
||
|
|
{
|
||
|
|
pgd_t *pgd;
|
||
|
|
struct host_vm_change hvc;
|
||
|
|
unsigned long addr = start_addr, next;
|
||
|
|
int ret = 0, userspace = 1;
|
||
|
|
|
||
|
|
hvc = INIT_HVC(mm, force, userspace);
|
||
|
|
pgd = pgd_offset(mm, addr);
|
||
|
|
do {
|
||
|
|
next = pgd_addr_end(addr, end_addr);
|
||
|
|
if (!pgd_present(*pgd)) {
|
||
|
|
if (force || pgd_newpage(*pgd)) {
|
||
|
|
ret = add_munmap(addr, next - addr, &hvc);
|
||
|
|
pgd_mkuptodate(*pgd);
|
||
|
|
}
|
||
|
|
} else
|
||
|
|
ret = update_p4d_range(pgd, addr, next, &hvc);
|
||
|
|
} while (pgd++, addr = next, ((addr < end_addr) && !ret));
|
||
|
|
|
||
|
|
if (!ret)
|
||
|
|
ret = do_ops(&hvc, hvc.index, 1);
|
||
|
|
|
||
|
|
/* This is not an else because ret is modified above */
|
||
|
|
if (ret) {
|
||
|
|
struct mm_id *mm_idp = ¤t->mm->context.id;
|
||
|
|
|
||
|
|
printk(KERN_ERR "fix_range_common: failed, killing current "
|
||
|
|
"process: %d\n", task_tgid_vnr(current));
|
||
|
|
mm_idp->kill = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
struct mm_struct *mm;
|
||
|
|
pgd_t *pgd;
|
||
|
|
p4d_t *p4d;
|
||
|
|
pud_t *pud;
|
||
|
|
pmd_t *pmd;
|
||
|
|
pte_t *pte;
|
||
|
|
unsigned long addr, last;
|
||
|
|
int updated = 0, err = 0, force = 0, userspace = 0;
|
||
|
|
struct host_vm_change hvc;
|
||
|
|
|
||
|
|
mm = &init_mm;
|
||
|
|
hvc = INIT_HVC(mm, force, userspace);
|
||
|
|
for (addr = start; addr < end;) {
|
||
|
|
pgd = pgd_offset(mm, addr);
|
||
|
|
if (!pgd_present(*pgd)) {
|
||
|
|
last = ADD_ROUND(addr, PGDIR_SIZE);
|
||
|
|
if (last > end)
|
||
|
|
last = end;
|
||
|
|
if (pgd_newpage(*pgd)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_munmap(addr, last - addr, &hvc);
|
||
|
|
if (err < 0)
|
||
|
|
panic("munmap failed, errno = %d\n",
|
||
|
|
-err);
|
||
|
|
}
|
||
|
|
addr = last;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
p4d = p4d_offset(pgd, addr);
|
||
|
|
if (!p4d_present(*p4d)) {
|
||
|
|
last = ADD_ROUND(addr, P4D_SIZE);
|
||
|
|
if (last > end)
|
||
|
|
last = end;
|
||
|
|
if (p4d_newpage(*p4d)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_munmap(addr, last - addr, &hvc);
|
||
|
|
if (err < 0)
|
||
|
|
panic("munmap failed, errno = %d\n",
|
||
|
|
-err);
|
||
|
|
}
|
||
|
|
addr = last;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
pud = pud_offset(p4d, addr);
|
||
|
|
if (!pud_present(*pud)) {
|
||
|
|
last = ADD_ROUND(addr, PUD_SIZE);
|
||
|
|
if (last > end)
|
||
|
|
last = end;
|
||
|
|
if (pud_newpage(*pud)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_munmap(addr, last - addr, &hvc);
|
||
|
|
if (err < 0)
|
||
|
|
panic("munmap failed, errno = %d\n",
|
||
|
|
-err);
|
||
|
|
}
|
||
|
|
addr = last;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
pmd = pmd_offset(pud, addr);
|
||
|
|
if (!pmd_present(*pmd)) {
|
||
|
|
last = ADD_ROUND(addr, PMD_SIZE);
|
||
|
|
if (last > end)
|
||
|
|
last = end;
|
||
|
|
if (pmd_newpage(*pmd)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_munmap(addr, last - addr, &hvc);
|
||
|
|
if (err < 0)
|
||
|
|
panic("munmap failed, errno = %d\n",
|
||
|
|
-err);
|
||
|
|
}
|
||
|
|
addr = last;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
pte = pte_offset_kernel(pmd, addr);
|
||
|
|
if (!pte_present(*pte) || pte_newpage(*pte)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_munmap(addr, PAGE_SIZE, &hvc);
|
||
|
|
if (err < 0)
|
||
|
|
panic("munmap failed, errno = %d\n",
|
||
|
|
-err);
|
||
|
|
if (pte_present(*pte))
|
||
|
|
err = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
|
||
|
|
PAGE_SIZE, 0, &hvc);
|
||
|
|
}
|
||
|
|
else if (pte_newprot(*pte)) {
|
||
|
|
updated = 1;
|
||
|
|
err = add_mprotect(addr, PAGE_SIZE, 0, &hvc);
|
||
|
|
}
|
||
|
|
addr += PAGE_SIZE;
|
||
|
|
}
|
||
|
|
if (!err)
|
||
|
|
err = do_ops(&hvc, hvc.index, 1);
|
||
|
|
|
||
|
|
if (err < 0)
|
||
|
|
panic("flush_tlb_kernel failed, errno = %d\n", err);
|
||
|
|
return updated;
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
|
||
|
|
{
|
||
|
|
pgd_t *pgd;
|
||
|
|
p4d_t *p4d;
|
||
|
|
pud_t *pud;
|
||
|
|
pmd_t *pmd;
|
||
|
|
pte_t *pte;
|
||
|
|
struct mm_struct *mm = vma->vm_mm;
|
||
|
|
void *flush = NULL;
|
||
|
|
int r, w, x, prot, err = 0;
|
||
|
|
struct mm_id *mm_id;
|
||
|
|
|
||
|
|
address &= PAGE_MASK;
|
||
|
|
|
||
|
|
pgd = pgd_offset(mm, address);
|
||
|
|
if (!pgd_present(*pgd))
|
||
|
|
goto kill;
|
||
|
|
|
||
|
|
p4d = p4d_offset(pgd, address);
|
||
|
|
if (!p4d_present(*p4d))
|
||
|
|
goto kill;
|
||
|
|
|
||
|
|
pud = pud_offset(p4d, address);
|
||
|
|
if (!pud_present(*pud))
|
||
|
|
goto kill;
|
||
|
|
|
||
|
|
pmd = pmd_offset(pud, address);
|
||
|
|
if (!pmd_present(*pmd))
|
||
|
|
goto kill;
|
||
|
|
|
||
|
|
pte = pte_offset_kernel(pmd, address);
|
||
|
|
|
||
|
|
r = pte_read(*pte);
|
||
|
|
w = pte_write(*pte);
|
||
|
|
x = pte_exec(*pte);
|
||
|
|
if (!pte_young(*pte)) {
|
||
|
|
r = 0;
|
||
|
|
w = 0;
|
||
|
|
} else if (!pte_dirty(*pte)) {
|
||
|
|
w = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
mm_id = &mm->context.id;
|
||
|
|
prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
|
||
|
|
(x ? UM_PROT_EXEC : 0));
|
||
|
|
if (pte_newpage(*pte)) {
|
||
|
|
if (pte_present(*pte)) {
|
||
|
|
unsigned long long offset;
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
|
||
|
|
err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
|
||
|
|
1, &flush);
|
||
|
|
}
|
||
|
|
else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
|
||
|
|
}
|
||
|
|
else if (pte_newprot(*pte))
|
||
|
|
err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
|
||
|
|
|
||
|
|
if (err) {
|
||
|
|
if (err == -ENOMEM)
|
||
|
|
report_enomem();
|
||
|
|
|
||
|
|
goto kill;
|
||
|
|
}
|
||
|
|
|
||
|
|
*pte = pte_mkuptodate(*pte);
|
||
|
|
|
||
|
|
return;
|
||
|
|
|
||
|
|
kill:
|
||
|
|
printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
|
||
|
|
force_sig(SIGKILL);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_all(void)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Don't bother flushing if this address space is about to be
|
||
|
|
* destroyed.
|
||
|
|
*/
|
||
|
|
if (atomic_read(¤t->mm->mm_users) == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
flush_tlb_mm(current->mm);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
flush_tlb_kernel_range_common(start, end);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_kernel_vm(void)
|
||
|
|
{
|
||
|
|
flush_tlb_kernel_range_common(start_vm, end_vm);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __flush_tlb_one(unsigned long addr)
|
||
|
|
{
|
||
|
|
flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
|
||
|
|
unsigned long end_addr, int force)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Don't bother flushing if this address space is about to be
|
||
|
|
* destroyed.
|
||
|
|
*/
|
||
|
|
if (atomic_read(&mm->mm_users) == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
fix_range_common(mm, start_addr, end_addr, force);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
|
||
|
|
unsigned long end)
|
||
|
|
{
|
||
|
|
if (vma->vm_mm == NULL)
|
||
|
|
flush_tlb_kernel_range_common(start, end);
|
||
|
|
else fix_range(vma->vm_mm, start, end, 0);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(flush_tlb_range);
|
||
|
|
|
||
|
|
void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
|
||
|
|
unsigned long end)
|
||
|
|
{
|
||
|
|
fix_range(mm, start, end, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
struct vm_area_struct *vma;
|
||
|
|
VMA_ITERATOR(vmi, mm, 0);
|
||
|
|
|
||
|
|
for_each_vma(vmi, vma)
|
||
|
|
fix_range(mm, vma->vm_start, vma->vm_end, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void force_flush_all(void)
|
||
|
|
{
|
||
|
|
struct mm_struct *mm = current->mm;
|
||
|
|
struct vm_area_struct *vma;
|
||
|
|
VMA_ITERATOR(vmi, mm, 0);
|
||
|
|
|
||
|
|
mmap_read_lock(mm);
|
||
|
|
for_each_vma(vmi, vma)
|
||
|
|
fix_range(mm, vma->vm_start, vma->vm_end, 1);
|
||
|
|
mmap_read_unlock(mm);
|
||
|
|
}
|