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604 lines
13 KiB
604 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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*/ |
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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/signal.h> |
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|
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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 userspace; |
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int index; |
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struct mm_struct *mm; |
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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, userspace) \ |
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((struct host_vm_change) \ |
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{ .ops = { { .type = NONE } }, \ |
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.mm = mm, \ |
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.data = NULL, \ |
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.userspace = userspace, \ |
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.index = 0, \ |
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.force = force }) |
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static void report_enomem(void) |
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{ |
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printk(KERN_ERR "UML ran out of memory on the host side! " |
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"This can happen due to a memory limitation or " |
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"vm.max_map_count has been reached.\n"); |
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} |
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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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if (hvc->userspace) |
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ret = map(&hvc->mm->context.id, op->u.mmap.addr, |
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op->u.mmap.len, op->u.mmap.prot, |
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op->u.mmap.fd, |
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op->u.mmap.offset, finished, |
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&hvc->data); |
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else |
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map_memory(op->u.mmap.addr, op->u.mmap.offset, |
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op->u.mmap.len, 1, 1, 1); |
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break; |
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case MUNMAP: |
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if (hvc->userspace) |
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ret = unmap(&hvc->mm->context.id, |
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op->u.munmap.addr, |
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op->u.munmap.len, finished, |
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&hvc->data); |
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else |
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ret = os_unmap_memory( |
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(void *) op->u.munmap.addr, |
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op->u.munmap.len); |
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break; |
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case MPROTECT: |
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if (hvc->userspace) |
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ret = protect(&hvc->mm->context.id, |
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op->u.mprotect.addr, |
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op->u.mprotect.len, |
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op->u.mprotect.prot, |
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finished, &hvc->data); |
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else |
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ret = os_protect_memory( |
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(void *) op->u.mprotect.addr, |
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op->u.mprotect.len, |
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1, 1, 1); |
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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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if (ret == -ENOMEM) |
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report_enomem(); |
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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 = -1, ret = 0; |
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if (hvc->userspace) |
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fd = phys_mapping(phys, &offset); |
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else |
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offset = phys; |
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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 (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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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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if (pte_newpage(*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(p4d_t *p4d, 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(p4d, 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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static inline int update_p4d_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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p4d_t *p4d; |
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unsigned long next; |
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int ret = 0; |
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p4d = p4d_offset(pgd, addr); |
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do { |
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next = p4d_addr_end(addr, end); |
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if (!p4d_present(*p4d)) { |
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if (hvc->force || p4d_newpage(*p4d)) { |
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ret = add_munmap(addr, next - addr, hvc); |
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p4d_mkuptodate(*p4d); |
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} |
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} else |
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ret = update_pud_range(p4d, addr, next, hvc); |
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} while (p4d++, 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, userspace = 1; |
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hvc = INIT_HVC(mm, force, userspace); |
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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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} else |
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ret = update_p4d_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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struct mm_id *mm_idp = ¤t->mm->context.id; |
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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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mm_idp->kill = 1; |
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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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p4d_t *p4d; |
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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 = 0, force = 0, userspace = 0; |
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struct host_vm_change hvc; |
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mm = &init_mm; |
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hvc = INIT_HVC(mm, force, userspace); |
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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 = add_munmap(addr, last - addr, &hvc); |
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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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p4d = p4d_offset(pgd, addr); |
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if (!p4d_present(*p4d)) { |
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last = ADD_ROUND(addr, P4D_SIZE); |
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if (last > end) |
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last = end; |
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if (p4d_newpage(*p4d)) { |
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updated = 1; |
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err = add_munmap(addr, last - addr, &hvc); |
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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(p4d, 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 = add_munmap(addr, last - addr, &hvc); |
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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 = add_munmap(addr, last - addr, &hvc); |
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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 = add_munmap(addr, PAGE_SIZE, &hvc); |
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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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err = add_mmap(addr, pte_val(*pte) & PAGE_MASK, |
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PAGE_SIZE, 0, &hvc); |
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} |
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else if (pte_newprot(*pte)) { |
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updated = 1; |
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err = add_mprotect(addr, PAGE_SIZE, 0, &hvc); |
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} |
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addr += PAGE_SIZE; |
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} |
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if (!err) |
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err = do_ops(&hvc, hvc.index, 1); |
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if (err < 0) |
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panic("flush_tlb_kernel failed, errno = %d\n", err); |
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return updated; |
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} |
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) |
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{ |
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pgd_t *pgd; |
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p4d_t *p4d; |
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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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struct mm_struct *mm = vma->vm_mm; |
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void *flush = NULL; |
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int r, w, x, prot, err = 0; |
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struct mm_id *mm_id; |
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address &= PAGE_MASK; |
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pgd = pgd_offset(mm, address); |
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if (!pgd_present(*pgd)) |
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goto kill; |
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p4d = p4d_offset(pgd, address); |
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if (!p4d_present(*p4d)) |
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goto kill; |
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pud = pud_offset(p4d, address); |
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if (!pud_present(*pud)) |
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goto kill; |
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pmd = pmd_offset(pud, address); |
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if (!pmd_present(*pmd)) |
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goto kill; |
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pte = pte_offset_kernel(pmd, address); |
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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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} |
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mm_id = &mm->context.id; |
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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 (pte_newpage(*pte)) { |
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if (pte_present(*pte)) { |
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unsigned long long offset; |
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int fd; |
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fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset); |
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err = map(mm_id, address, PAGE_SIZE, prot, fd, offset, |
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1, &flush); |
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} |
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else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush); |
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} |
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else if (pte_newprot(*pte)) |
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err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush); |
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if (err) { |
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if (err == -ENOMEM) |
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report_enomem(); |
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goto kill; |
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} |
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*pte = pte_mkuptodate(*pte); |
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return; |
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kill: |
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printk(KERN_ERR "Failed to flush page for address 0x%lx\n", address); |
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force_sig(SIGKILL); |
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} |
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void flush_tlb_all(void) |
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{ |
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/* |
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* Don't bother flushing if this address space is about to be |
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* destroyed. |
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*/ |
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if (atomic_read(¤t->mm->mm_users) == 0) |
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return; |
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flush_tlb_mm(current->mm); |
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} |
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void flush_tlb_kernel_range(unsigned long start, unsigned long end) |
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{ |
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flush_tlb_kernel_range_common(start, end); |
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} |
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void flush_tlb_kernel_vm(void) |
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{ |
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flush_tlb_kernel_range_common(start_vm, end_vm); |
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} |
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void __flush_tlb_one(unsigned long addr) |
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{ |
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flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE); |
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} |
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|
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static void fix_range(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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/* |
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* Don't bother flushing if this address space is about to be |
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* destroyed. |
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*/ |
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if (atomic_read(&mm->mm_users) == 0) |
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return; |
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fix_range_common(mm, start_addr, end_addr, force); |
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} |
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|
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void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, |
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unsigned long end) |
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{ |
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if (vma->vm_mm == NULL) |
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flush_tlb_kernel_range_common(start, end); |
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else fix_range(vma->vm_mm, start, end, 0); |
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} |
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EXPORT_SYMBOL(flush_tlb_range); |
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|
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void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, |
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unsigned long end) |
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{ |
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fix_range(mm, start, end, 0); |
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} |
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|
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void flush_tlb_mm(struct mm_struct *mm) |
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{ |
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struct vm_area_struct *vma = mm->mmap; |
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|
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while (vma != NULL) { |
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fix_range(mm, vma->vm_start, vma->vm_end, 0); |
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vma = vma->vm_next; |
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} |
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} |
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|
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void force_flush_all(void) |
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{ |
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struct mm_struct *mm = current->mm; |
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struct vm_area_struct *vma = mm->mmap; |
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while (vma != NULL) { |
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fix_range(mm, vma->vm_start, vma->vm_end, 1); |
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vma = vma->vm_next; |
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} |
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}
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