545 lines
12 KiB
C
545 lines
12 KiB
C
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <as-layout.h>
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#include <mem_user.h>
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#include <os.h>
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#include <skas.h>
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#include <kern_util.h>
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struct host_vm_change {
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struct host_vm_op {
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enum { NONE, MMAP, MUNMAP, MPROTECT } type;
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union {
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struct {
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unsigned long addr;
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unsigned long len;
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unsigned int prot;
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int fd;
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__u64 offset;
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} mmap;
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struct {
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unsigned long addr;
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unsigned long len;
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} munmap;
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struct {
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unsigned long addr;
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unsigned long len;
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unsigned int prot;
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} mprotect;
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} u;
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} ops[1];
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int index;
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struct mm_id *id;
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void *data;
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int force;
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};
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#define INIT_HVC(mm, force) \
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((struct host_vm_change) \
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{ .ops = { { .type = NONE } }, \
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.id = &mm->context.id, \
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.data = NULL, \
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.index = 0, \
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.force = force })
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static int do_ops(struct host_vm_change *hvc, int end,
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int finished)
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{
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struct host_vm_op *op;
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int i, ret = 0;
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for (i = 0; i < end && !ret; i++) {
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op = &hvc->ops[i];
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switch (op->type) {
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case MMAP:
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ret = map(hvc->id, op->u.mmap.addr, op->u.mmap.len,
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op->u.mmap.prot, op->u.mmap.fd,
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op->u.mmap.offset, finished, &hvc->data);
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break;
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case MUNMAP:
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ret = unmap(hvc->id, op->u.munmap.addr,
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op->u.munmap.len, finished, &hvc->data);
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break;
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case MPROTECT:
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ret = protect(hvc->id, op->u.mprotect.addr,
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op->u.mprotect.len, op->u.mprotect.prot,
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finished, &hvc->data);
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break;
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default:
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printk(KERN_ERR "Unknown op type %d in do_ops\n",
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op->type);
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BUG();
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break;
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}
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}
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return ret;
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}
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static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
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unsigned int prot, struct host_vm_change *hvc)
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{
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__u64 offset;
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struct host_vm_op *last;
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int fd, ret = 0;
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fd = phys_mapping(phys, &offset);
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if (hvc->index != 0) {
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last = &hvc->ops[hvc->index - 1];
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if ((last->type == MMAP) &&
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(last->u.mmap.addr + last->u.mmap.len == virt) &&
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(last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
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(last->u.mmap.offset + last->u.mmap.len == offset)) {
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last->u.mmap.len += len;
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return 0;
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}
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}
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if (hvc->index == ARRAY_SIZE(hvc->ops)) {
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ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
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hvc->index = 0;
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}
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hvc->ops[hvc->index++] = ((struct host_vm_op)
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{ .type = MMAP,
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.u = { .mmap = { .addr = virt,
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.len = len,
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.prot = prot,
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.fd = fd,
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.offset = offset }
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} });
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return ret;
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}
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static int add_munmap(unsigned long addr, unsigned long len,
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struct host_vm_change *hvc)
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{
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struct host_vm_op *last;
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int ret = 0;
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if ((addr >= STUB_START) && (addr < STUB_END))
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return -EINVAL;
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if (hvc->index != 0) {
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last = &hvc->ops[hvc->index - 1];
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if ((last->type == MUNMAP) &&
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(last->u.munmap.addr + last->u.mmap.len == addr)) {
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last->u.munmap.len += len;
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return 0;
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}
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}
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if (hvc->index == ARRAY_SIZE(hvc->ops)) {
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ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
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hvc->index = 0;
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}
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hvc->ops[hvc->index++] = ((struct host_vm_op)
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{ .type = MUNMAP,
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.u = { .munmap = { .addr = addr,
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.len = len } } });
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return ret;
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}
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static int add_mprotect(unsigned long addr, unsigned long len,
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unsigned int prot, struct host_vm_change *hvc)
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{
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struct host_vm_op *last;
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int ret = 0;
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if (hvc->index != 0) {
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last = &hvc->ops[hvc->index - 1];
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if ((last->type == MPROTECT) &&
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(last->u.mprotect.addr + last->u.mprotect.len == addr) &&
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(last->u.mprotect.prot == prot)) {
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last->u.mprotect.len += len;
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return 0;
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}
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}
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if (hvc->index == ARRAY_SIZE(hvc->ops)) {
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ret = do_ops(hvc, ARRAY_SIZE(hvc->ops), 0);
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hvc->index = 0;
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}
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hvc->ops[hvc->index++] = ((struct host_vm_op)
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{ .type = MPROTECT,
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.u = { .mprotect = { .addr = addr,
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.len = len,
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.prot = prot } } });
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return ret;
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}
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#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))
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static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
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unsigned long end,
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struct host_vm_change *hvc)
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{
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pte_t *pte;
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int r, w, x, prot, ret = 0;
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pte = pte_offset_kernel(pmd, addr);
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do {
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if ((addr >= STUB_START) && (addr < STUB_END))
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continue;
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r = pte_read(*pte);
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w = pte_write(*pte);
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x = pte_exec(*pte);
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if (!pte_young(*pte)) {
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r = 0;
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w = 0;
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} else if (!pte_dirty(*pte))
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w = 0;
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prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
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(x ? UM_PROT_EXEC : 0));
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if (hvc->force || pte_newpage(*pte)) {
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if (pte_present(*pte))
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ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
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PAGE_SIZE, prot, hvc);
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else
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ret = add_munmap(addr, PAGE_SIZE, hvc);
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} else if (pte_newprot(*pte))
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ret = add_mprotect(addr, PAGE_SIZE, prot, hvc);
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*pte = pte_mkuptodate(*pte);
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} while (pte++, addr += PAGE_SIZE, ((addr < end) && !ret));
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return ret;
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}
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static inline int update_pmd_range(pud_t *pud, unsigned long addr,
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unsigned long end,
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struct host_vm_change *hvc)
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{
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pmd_t *pmd;
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unsigned long next;
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int ret = 0;
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pmd = pmd_offset(pud, addr);
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do {
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next = pmd_addr_end(addr, end);
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if (!pmd_present(*pmd)) {
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if (hvc->force || pmd_newpage(*pmd)) {
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ret = add_munmap(addr, next - addr, hvc);
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pmd_mkuptodate(*pmd);
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}
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}
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else ret = update_pte_range(pmd, addr, next, hvc);
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} while (pmd++, addr = next, ((addr < end) && !ret));
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return ret;
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}
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static inline int update_pud_range(pgd_t *pgd, unsigned long addr,
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unsigned long end,
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struct host_vm_change *hvc)
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{
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pud_t *pud;
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unsigned long next;
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int ret = 0;
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pud = pud_offset(pgd, addr);
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do {
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next = pud_addr_end(addr, end);
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if (!pud_present(*pud)) {
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if (hvc->force || pud_newpage(*pud)) {
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ret = add_munmap(addr, next - addr, hvc);
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pud_mkuptodate(*pud);
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}
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}
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else ret = update_pmd_range(pud, addr, next, hvc);
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} while (pud++, addr = next, ((addr < end) && !ret));
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return ret;
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}
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void fix_range_common(struct mm_struct *mm, unsigned long start_addr,
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unsigned long end_addr, int force)
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{
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pgd_t *pgd;
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struct host_vm_change hvc;
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unsigned long addr = start_addr, next;
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int ret = 0;
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hvc = INIT_HVC(mm, force);
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pgd = pgd_offset(mm, addr);
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do {
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next = pgd_addr_end(addr, end_addr);
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if (!pgd_present(*pgd)) {
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if (force || pgd_newpage(*pgd)) {
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ret = add_munmap(addr, next - addr, &hvc);
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pgd_mkuptodate(*pgd);
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}
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}
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else ret = update_pud_range(pgd, addr, next, &hvc);
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} while (pgd++, addr = next, ((addr < end_addr) && !ret));
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if (!ret)
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ret = do_ops(&hvc, hvc.index, 1);
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/* This is not an else because ret is modified above */
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if (ret) {
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printk(KERN_ERR "fix_range_common: failed, killing current "
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"process: %d\n", task_tgid_vnr(current));
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/* We are under mmap_sem, release it such that current can terminate */
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up_write(¤t->mm->mmap_sem);
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force_sig(SIGKILL, current);
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do_signal();
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}
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}
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static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)
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{
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struct mm_struct *mm;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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unsigned long addr, last;
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int updated = 0, err;
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mm = &init_mm;
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for (addr = start; addr < end;) {
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pgd = pgd_offset(mm, addr);
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if (!pgd_present(*pgd)) {
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last = ADD_ROUND(addr, PGDIR_SIZE);
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if (last > end)
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last = end;
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if (pgd_newpage(*pgd)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pud = pud_offset(pgd, addr);
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if (!pud_present(*pud)) {
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last = ADD_ROUND(addr, PUD_SIZE);
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if (last > end)
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last = end;
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if (pud_newpage(*pud)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pmd = pmd_offset(pud, addr);
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if (!pmd_present(*pmd)) {
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last = ADD_ROUND(addr, PMD_SIZE);
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if (last > end)
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last = end;
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if (pmd_newpage(*pmd)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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last - addr);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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}
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addr = last;
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continue;
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}
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pte = pte_offset_kernel(pmd, addr);
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if (!pte_present(*pte) || pte_newpage(*pte)) {
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updated = 1;
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err = os_unmap_memory((void *) addr,
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PAGE_SIZE);
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if (err < 0)
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panic("munmap failed, errno = %d\n",
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-err);
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if (pte_present(*pte))
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map_memory(addr,
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pte_val(*pte) & PAGE_MASK,
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PAGE_SIZE, 1, 1, 1);
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}
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else if (pte_newprot(*pte)) {
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updated = 1;
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os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1);
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}
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addr += PAGE_SIZE;
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|
|
}
|
||
|
|
return updated;
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
|
||
|
|
{
|
||
|
|
pgd_t *pgd;
|
||
|
|
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;
|
||
|
|
|
||
|
|
pud = pud_offset(pgd, 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)
|
||
|
|
goto kill;
|
||
|
|
|
||
|
|
*pte = pte_mkuptodate(*pte);
|
||
|
|
|
||
|
|
return;
|
||
|
|
|
||
|
|
kill:
|
||
|
|
printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address);
|
||
|
|
force_sig(SIGKILL, current);
|
||
|
|
}
|
||
|
|
|
||
|
|
pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
|
||
|
|
{
|
||
|
|
return pgd_offset(mm, address);
|
||
|
|
}
|
||
|
|
|
||
|
|
pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address)
|
||
|
|
{
|
||
|
|
return pud_offset(pgd, address);
|
||
|
|
}
|
||
|
|
|
||
|
|
pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address)
|
||
|
|
{
|
||
|
|
return pmd_offset(pud, address);
|
||
|
|
}
|
||
|
|
|
||
|
|
pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address)
|
||
|
|
{
|
||
|
|
return pte_offset_kernel(pmd, address);
|
||
|
|
}
|
||
|
|
|
||
|
|
pte_t *addr_pte(struct task_struct *task, unsigned long addr)
|
||
|
|
{
|
||
|
|
pgd_t *pgd = pgd_offset(task->mm, addr);
|
||
|
|
pud_t *pud = pud_offset(pgd, addr);
|
||
|
|
pmd_t *pmd = pmd_offset(pud, addr);
|
||
|
|
|
||
|
|
return pte_offset_map(pmd, addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_all(void)
|
||
|
|
{
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Don't bother flushing if this address space is about to be
|
||
|
|
* destroyed.
|
||
|
|
*/
|
||
|
|
if (atomic_read(&mm->mm_users) == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
fix_range(mm, start, end, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void flush_tlb_mm(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
struct vm_area_struct *vma = mm->mmap;
|
||
|
|
|
||
|
|
while (vma != NULL) {
|
||
|
|
fix_range(mm, vma->vm_start, vma->vm_end, 0);
|
||
|
|
vma = vma->vm_next;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void force_flush_all(void)
|
||
|
|
{
|
||
|
|
struct mm_struct *mm = current->mm;
|
||
|
|
struct vm_area_struct *vma = mm->mmap;
|
||
|
|
|
||
|
|
while (vma != NULL) {
|
||
|
|
fix_range(mm, vma->vm_start, vma->vm_end, 1);
|
||
|
|
vma = vma->vm_next;
|
||
|
|
}
|
||
|
|
}
|