Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 2 | /****************************************************************************** |
| 3 | * privcmd.c |
| 4 | * |
| 5 | * Interface to privileged domain-0 commands. |
| 6 | * |
| 7 | * Copyright (c) 2002-2004, K A Fraser, B Dragovic |
| 8 | */ |
| 9 | |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 10 | #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt |
| 11 | |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 12 | #include <linux/eventfd.h> |
| 13 | #include <linux/file.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 14 | #include <linux/kernel.h> |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 15 | #include <linux/module.h> |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 16 | #include <linux/mutex.h> |
| 17 | #include <linux/poll.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 18 | #include <linux/sched.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/string.h> |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 21 | #include <linux/workqueue.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 22 | #include <linux/errno.h> |
| 23 | #include <linux/mm.h> |
| 24 | #include <linux/mman.h> |
| 25 | #include <linux/uaccess.h> |
| 26 | #include <linux/swap.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 27 | #include <linux/highmem.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/seq_file.h> |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 30 | #include <linux/miscdevice.h> |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 31 | #include <linux/moduleparam.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 32 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 33 | #include <asm/xen/hypervisor.h> |
| 34 | #include <asm/xen/hypercall.h> |
| 35 | |
| 36 | #include <xen/xen.h> |
| 37 | #include <xen/privcmd.h> |
| 38 | #include <xen/interface/xen.h> |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 39 | #include <xen/interface/memory.h> |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 40 | #include <xen/interface/hvm/dm_op.h> |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 41 | #include <xen/features.h> |
| 42 | #include <xen/page.h> |
Ian Campbell | de1ef20 | 2009-05-21 10:09:46 +0100 | [diff] [blame] | 43 | #include <xen/xen-ops.h> |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 44 | #include <xen/balloon.h> |
Ian Campbell | f020e29 | 2009-05-20 15:42:14 +0100 | [diff] [blame] | 45 | |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 46 | #include "privcmd.h" |
| 47 | |
| 48 | MODULE_LICENSE("GPL"); |
| 49 | |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 50 | #define PRIV_VMA_LOCKED ((void *)1) |
| 51 | |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 52 | static unsigned int privcmd_dm_op_max_num = 16; |
| 53 | module_param_named(dm_op_max_nr_bufs, privcmd_dm_op_max_num, uint, 0644); |
| 54 | MODULE_PARM_DESC(dm_op_max_nr_bufs, |
| 55 | "Maximum number of buffers per dm_op hypercall"); |
| 56 | |
| 57 | static unsigned int privcmd_dm_op_buf_max_size = 4096; |
| 58 | module_param_named(dm_op_buf_max_size, privcmd_dm_op_buf_max_size, uint, |
| 59 | 0644); |
| 60 | MODULE_PARM_DESC(dm_op_buf_max_size, |
| 61 | "Maximum size of a dm_op hypercall buffer"); |
| 62 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 63 | struct privcmd_data { |
| 64 | domid_t domid; |
| 65 | }; |
| 66 | |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 67 | static int privcmd_vma_range_is_mapped( |
| 68 | struct vm_area_struct *vma, |
| 69 | unsigned long addr, |
| 70 | unsigned long nr_pages); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 71 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 72 | static long privcmd_ioctl_hypercall(struct file *file, void __user *udata) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 73 | { |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 74 | struct privcmd_data *data = file->private_data; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 75 | struct privcmd_hypercall hypercall; |
| 76 | long ret; |
| 77 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 78 | /* Disallow arbitrary hypercalls if restricted */ |
| 79 | if (data->domid != DOMID_INVALID) |
| 80 | return -EPERM; |
| 81 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 82 | if (copy_from_user(&hypercall, udata, sizeof(hypercall))) |
| 83 | return -EFAULT; |
| 84 | |
David Vrabel | fdfd811 | 2015-02-19 15:23:17 +0000 | [diff] [blame] | 85 | xen_preemptible_hcall_begin(); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 86 | ret = privcmd_call(hypercall.op, |
| 87 | hypercall.arg[0], hypercall.arg[1], |
| 88 | hypercall.arg[2], hypercall.arg[3], |
| 89 | hypercall.arg[4]); |
David Vrabel | fdfd811 | 2015-02-19 15:23:17 +0000 | [diff] [blame] | 90 | xen_preemptible_hcall_end(); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 91 | |
| 92 | return ret; |
| 93 | } |
| 94 | |
| 95 | static void free_page_list(struct list_head *pages) |
| 96 | { |
| 97 | struct page *p, *n; |
| 98 | |
| 99 | list_for_each_entry_safe(p, n, pages, lru) |
| 100 | __free_page(p); |
| 101 | |
| 102 | INIT_LIST_HEAD(pages); |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * Given an array of items in userspace, return a list of pages |
| 107 | * containing the data. If copying fails, either because of memory |
| 108 | * allocation failure or a problem reading user memory, return an |
| 109 | * error code; its up to the caller to dispose of any partial list. |
| 110 | */ |
| 111 | static int gather_array(struct list_head *pagelist, |
| 112 | unsigned nelem, size_t size, |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 113 | const void __user *data) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 114 | { |
| 115 | unsigned pageidx; |
| 116 | void *pagedata; |
| 117 | int ret; |
| 118 | |
| 119 | if (size > PAGE_SIZE) |
| 120 | return 0; |
| 121 | |
| 122 | pageidx = PAGE_SIZE; |
| 123 | pagedata = NULL; /* quiet, gcc */ |
| 124 | while (nelem--) { |
| 125 | if (pageidx > PAGE_SIZE-size) { |
| 126 | struct page *page = alloc_page(GFP_KERNEL); |
| 127 | |
| 128 | ret = -ENOMEM; |
| 129 | if (page == NULL) |
| 130 | goto fail; |
| 131 | |
| 132 | pagedata = page_address(page); |
| 133 | |
| 134 | list_add_tail(&page->lru, pagelist); |
| 135 | pageidx = 0; |
| 136 | } |
| 137 | |
| 138 | ret = -EFAULT; |
| 139 | if (copy_from_user(pagedata + pageidx, data, size)) |
| 140 | goto fail; |
| 141 | |
| 142 | data += size; |
| 143 | pageidx += size; |
| 144 | } |
| 145 | |
| 146 | ret = 0; |
| 147 | |
| 148 | fail: |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Call function "fn" on each element of the array fragmented |
| 154 | * over a list of pages. |
| 155 | */ |
| 156 | static int traverse_pages(unsigned nelem, size_t size, |
| 157 | struct list_head *pos, |
| 158 | int (*fn)(void *data, void *state), |
| 159 | void *state) |
| 160 | { |
| 161 | void *pagedata; |
| 162 | unsigned pageidx; |
Ian Campbell | f020e29 | 2009-05-20 15:42:14 +0100 | [diff] [blame] | 163 | int ret = 0; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 164 | |
| 165 | BUG_ON(size > PAGE_SIZE); |
| 166 | |
| 167 | pageidx = PAGE_SIZE; |
| 168 | pagedata = NULL; /* hush, gcc */ |
| 169 | |
| 170 | while (nelem--) { |
| 171 | if (pageidx > PAGE_SIZE-size) { |
| 172 | struct page *page; |
| 173 | pos = pos->next; |
| 174 | page = list_entry(pos, struct page, lru); |
| 175 | pagedata = page_address(page); |
| 176 | pageidx = 0; |
| 177 | } |
| 178 | |
| 179 | ret = (*fn)(pagedata + pageidx, state); |
| 180 | if (ret) |
| 181 | break; |
| 182 | pageidx += size; |
| 183 | } |
| 184 | |
| 185 | return ret; |
| 186 | } |
| 187 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 188 | /* |
| 189 | * Similar to traverse_pages, but use each page as a "block" of |
| 190 | * data to be processed as one unit. |
| 191 | */ |
| 192 | static int traverse_pages_block(unsigned nelem, size_t size, |
| 193 | struct list_head *pos, |
| 194 | int (*fn)(void *data, int nr, void *state), |
| 195 | void *state) |
| 196 | { |
| 197 | void *pagedata; |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 198 | int ret = 0; |
| 199 | |
| 200 | BUG_ON(size > PAGE_SIZE); |
| 201 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 202 | while (nelem) { |
| 203 | int nr = (PAGE_SIZE/size); |
| 204 | struct page *page; |
| 205 | if (nr > nelem) |
| 206 | nr = nelem; |
| 207 | pos = pos->next; |
| 208 | page = list_entry(pos, struct page, lru); |
| 209 | pagedata = page_address(page); |
| 210 | ret = (*fn)(pagedata, nr, state); |
| 211 | if (ret) |
| 212 | break; |
| 213 | nelem -= nr; |
| 214 | } |
| 215 | |
| 216 | return ret; |
| 217 | } |
| 218 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 219 | struct mmap_gfn_state { |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 220 | unsigned long va; |
| 221 | struct vm_area_struct *vma; |
| 222 | domid_t domain; |
| 223 | }; |
| 224 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 225 | static int mmap_gfn_range(void *data, void *state) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 226 | { |
| 227 | struct privcmd_mmap_entry *msg = data; |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 228 | struct mmap_gfn_state *st = state; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 229 | struct vm_area_struct *vma = st->vma; |
| 230 | int rc; |
| 231 | |
| 232 | /* Do not allow range to wrap the address space. */ |
| 233 | if ((msg->npages > (LONG_MAX >> PAGE_SHIFT)) || |
| 234 | ((unsigned long)(msg->npages << PAGE_SHIFT) >= -st->va)) |
| 235 | return -EINVAL; |
| 236 | |
| 237 | /* Range chunks must be contiguous in va space. */ |
| 238 | if ((msg->va != st->va) || |
| 239 | ((msg->va+(msg->npages<<PAGE_SHIFT)) > vma->vm_end)) |
| 240 | return -EINVAL; |
| 241 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 242 | rc = xen_remap_domain_gfn_range(vma, |
Ian Campbell | de1ef20 | 2009-05-21 10:09:46 +0100 | [diff] [blame] | 243 | msg->va & PAGE_MASK, |
| 244 | msg->mfn, msg->npages, |
| 245 | vma->vm_page_prot, |
Ian Campbell | 9a032e39 | 2012-10-17 13:37:49 -0700 | [diff] [blame] | 246 | st->domain, NULL); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 247 | if (rc < 0) |
| 248 | return rc; |
| 249 | |
| 250 | st->va += msg->npages << PAGE_SHIFT; |
| 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 255 | static long privcmd_ioctl_mmap(struct file *file, void __user *udata) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 256 | { |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 257 | struct privcmd_data *data = file->private_data; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 258 | struct privcmd_mmap mmapcmd; |
| 259 | struct mm_struct *mm = current->mm; |
| 260 | struct vm_area_struct *vma; |
| 261 | int rc; |
| 262 | LIST_HEAD(pagelist); |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 263 | struct mmap_gfn_state state; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 264 | |
Jan Beulich | 9731572 | 2021-09-22 12:18:25 +0200 | [diff] [blame] | 265 | /* We only support privcmd_ioctl_mmap_batch for non-auto-translated. */ |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 266 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
| 267 | return -ENOSYS; |
| 268 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 269 | if (copy_from_user(&mmapcmd, udata, sizeof(mmapcmd))) |
| 270 | return -EFAULT; |
| 271 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 272 | /* If restriction is in place, check the domid matches */ |
| 273 | if (data->domid != DOMID_INVALID && data->domid != mmapcmd.dom) |
| 274 | return -EPERM; |
| 275 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 276 | rc = gather_array(&pagelist, |
| 277 | mmapcmd.num, sizeof(struct privcmd_mmap_entry), |
| 278 | mmapcmd.entry); |
| 279 | |
| 280 | if (rc || list_empty(&pagelist)) |
| 281 | goto out; |
| 282 | |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 283 | mmap_write_lock(mm); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 284 | |
| 285 | { |
| 286 | struct page *page = list_first_entry(&pagelist, |
| 287 | struct page, lru); |
| 288 | struct privcmd_mmap_entry *msg = page_address(page); |
| 289 | |
Liam R. Howlett | 7ccf089 | 2022-09-06 19:48:49 +0000 | [diff] [blame] | 290 | vma = vma_lookup(mm, msg->va); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 291 | rc = -EINVAL; |
| 292 | |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 293 | if (!vma || (msg->va != vma->vm_start) || vma->vm_private_data) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 294 | goto out_up; |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 295 | vma->vm_private_data = PRIV_VMA_LOCKED; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | state.va = vma->vm_start; |
| 299 | state.vma = vma; |
| 300 | state.domain = mmapcmd.dom; |
| 301 | |
| 302 | rc = traverse_pages(mmapcmd.num, sizeof(struct privcmd_mmap_entry), |
| 303 | &pagelist, |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 304 | mmap_gfn_range, &state); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 305 | |
| 306 | |
| 307 | out_up: |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 308 | mmap_write_unlock(mm); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 309 | |
| 310 | out: |
| 311 | free_page_list(&pagelist); |
| 312 | |
| 313 | return rc; |
| 314 | } |
| 315 | |
| 316 | struct mmap_batch_state { |
| 317 | domid_t domain; |
| 318 | unsigned long va; |
| 319 | struct vm_area_struct *vma; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 320 | int index; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 321 | /* A tristate: |
| 322 | * 0 for no errors |
| 323 | * 1 if at least one error has happened (and no |
| 324 | * -ENOENT errors have happened) |
| 325 | * -ENOENT if at least 1 -ENOENT has happened. |
| 326 | */ |
| 327 | int global_error; |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 328 | int version; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 329 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 330 | /* User-space gfn array to store errors in the second pass for V1. */ |
| 331 | xen_pfn_t __user *user_gfn; |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 332 | /* User-space int array to store errors in the second pass for V2. */ |
| 333 | int __user *user_err; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 334 | }; |
| 335 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 336 | /* auto translated dom0 note: if domU being created is PV, then gfn is |
| 337 | * mfn(addr on bus). If it's auto xlated, then gfn is pfn (input to HAP). |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 338 | */ |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 339 | static int mmap_batch_fn(void *data, int nr, void *state) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 340 | { |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 341 | xen_pfn_t *gfnp = data; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 342 | struct mmap_batch_state *st = state; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 343 | struct vm_area_struct *vma = st->vma; |
| 344 | struct page **pages = vma->vm_private_data; |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 345 | struct page **cur_pages = NULL; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 346 | int ret; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 347 | |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 348 | if (xen_feature(XENFEAT_auto_translated_physmap)) |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 349 | cur_pages = &pages[st->index]; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 350 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 351 | BUG_ON(nr < 0); |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 352 | ret = xen_remap_domain_gfn_array(st->vma, st->va & PAGE_MASK, gfnp, nr, |
| 353 | (int *)gfnp, st->vma->vm_page_prot, |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 354 | st->domain, cur_pages); |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 355 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 356 | /* Adjust the global_error? */ |
| 357 | if (ret != nr) { |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 358 | if (ret == -ENOENT) |
| 359 | st->global_error = -ENOENT; |
| 360 | else { |
| 361 | /* Record that at least one error has happened. */ |
| 362 | if (st->global_error == 0) |
| 363 | st->global_error = 1; |
| 364 | } |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 365 | } |
Julien Grall | 753c09b | 2017-05-31 14:03:57 +0100 | [diff] [blame] | 366 | st->va += XEN_PAGE_SIZE * nr; |
| 367 | st->index += nr / XEN_PFN_PER_PAGE; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 368 | |
| 369 | return 0; |
| 370 | } |
| 371 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 372 | static int mmap_return_error(int err, struct mmap_batch_state *st) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 373 | { |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 374 | int ret; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 375 | |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 376 | if (st->version == 1) { |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 377 | if (err) { |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 378 | xen_pfn_t gfn; |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 379 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 380 | ret = get_user(gfn, st->user_gfn); |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 381 | if (ret < 0) |
| 382 | return ret; |
| 383 | /* |
| 384 | * V1 encodes the error codes in the 32bit top |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 385 | * nibble of the gfn (with its known |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 386 | * limitations vis-a-vis 64 bit callers). |
| 387 | */ |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 388 | gfn |= (err == -ENOENT) ? |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 389 | PRIVCMD_MMAPBATCH_PAGED_ERROR : |
| 390 | PRIVCMD_MMAPBATCH_MFN_ERROR; |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 391 | return __put_user(gfn, st->user_gfn++); |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 392 | } else |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 393 | st->user_gfn++; |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 394 | } else { /* st->version == 2 */ |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 395 | if (err) |
| 396 | return __put_user(err, st->user_err++); |
| 397 | else |
| 398 | st->user_err++; |
| 399 | } |
| 400 | |
| 401 | return 0; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 402 | } |
| 403 | |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 404 | static int mmap_return_errors(void *data, int nr, void *state) |
| 405 | { |
| 406 | struct mmap_batch_state *st = state; |
| 407 | int *errs = data; |
| 408 | int i; |
| 409 | int ret; |
| 410 | |
| 411 | for (i = 0; i < nr; i++) { |
| 412 | ret = mmap_return_error(errs[i], st); |
| 413 | if (ret < 0) |
| 414 | return ret; |
| 415 | } |
| 416 | return 0; |
| 417 | } |
| 418 | |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 419 | /* Allocate pfns that are then mapped with gfns from foreign domid. Update |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 420 | * the vma with the page info to use later. |
| 421 | * Returns: 0 if success, otherwise -errno |
| 422 | */ |
| 423 | static int alloc_empty_pages(struct vm_area_struct *vma, int numpgs) |
| 424 | { |
| 425 | int rc; |
| 426 | struct page **pages; |
| 427 | |
Jan Beulich | 0432523 | 2021-09-22 12:16:35 +0200 | [diff] [blame] | 428 | pages = kvcalloc(numpgs, sizeof(pages[0]), GFP_KERNEL); |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 429 | if (pages == NULL) |
| 430 | return -ENOMEM; |
| 431 | |
Roger Pau Monne | 9e2369c | 2020-09-01 10:33:26 +0200 | [diff] [blame] | 432 | rc = xen_alloc_unpopulated_pages(numpgs, pages); |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 433 | if (rc != 0) { |
| 434 | pr_warn("%s Could not alloc %d pfns rc:%d\n", __func__, |
| 435 | numpgs, rc); |
Jan Beulich | 0432523 | 2021-09-22 12:16:35 +0200 | [diff] [blame] | 436 | kvfree(pages); |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 437 | return -ENOMEM; |
| 438 | } |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 439 | BUG_ON(vma->vm_private_data != NULL); |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 440 | vma->vm_private_data = pages; |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
Kirill A. Shutemov | 7cbea8d | 2015-09-09 15:39:26 -0700 | [diff] [blame] | 445 | static const struct vm_operations_struct privcmd_vm_ops; |
Jeremy Fitzhardinge | f31fdf5 | 2009-03-08 04:10:00 -0700 | [diff] [blame] | 446 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 447 | static long privcmd_ioctl_mmap_batch( |
| 448 | struct file *file, void __user *udata, int version) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 449 | { |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 450 | struct privcmd_data *data = file->private_data; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 451 | int ret; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 452 | struct privcmd_mmapbatch_v2 m; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 453 | struct mm_struct *mm = current->mm; |
| 454 | struct vm_area_struct *vma; |
| 455 | unsigned long nr_pages; |
| 456 | LIST_HEAD(pagelist); |
| 457 | struct mmap_batch_state state; |
| 458 | |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 459 | switch (version) { |
| 460 | case 1: |
| 461 | if (copy_from_user(&m, udata, sizeof(struct privcmd_mmapbatch))) |
| 462 | return -EFAULT; |
| 463 | /* Returns per-frame error in m.arr. */ |
| 464 | m.err = NULL; |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 465 | if (!access_ok(m.arr, m.num * sizeof(*m.arr))) |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 466 | return -EFAULT; |
| 467 | break; |
| 468 | case 2: |
| 469 | if (copy_from_user(&m, udata, sizeof(struct privcmd_mmapbatch_v2))) |
| 470 | return -EFAULT; |
| 471 | /* Returns per-frame error code in m.err. */ |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 472 | if (!access_ok(m.err, m.num * (sizeof(*m.err)))) |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 473 | return -EFAULT; |
| 474 | break; |
| 475 | default: |
| 476 | return -EINVAL; |
| 477 | } |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 478 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 479 | /* If restriction is in place, check the domid matches */ |
| 480 | if (data->domid != DOMID_INVALID && data->domid != m.dom) |
| 481 | return -EPERM; |
| 482 | |
Julien Grall | 5995a68 | 2015-05-05 16:54:12 +0100 | [diff] [blame] | 483 | nr_pages = DIV_ROUND_UP(m.num, XEN_PFN_PER_PAGE); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 484 | if ((m.num <= 0) || (nr_pages > (LONG_MAX >> PAGE_SHIFT))) |
| 485 | return -EINVAL; |
| 486 | |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 487 | ret = gather_array(&pagelist, m.num, sizeof(xen_pfn_t), m.arr); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 488 | |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 489 | if (ret) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 490 | goto out; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 491 | if (list_empty(&pagelist)) { |
| 492 | ret = -EINVAL; |
| 493 | goto out; |
| 494 | } |
| 495 | |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 496 | if (version == 2) { |
| 497 | /* Zero error array now to only copy back actual errors. */ |
| 498 | if (clear_user(m.err, sizeof(int) * m.num)) { |
| 499 | ret = -EFAULT; |
| 500 | goto out; |
| 501 | } |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 502 | } |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 503 | |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 504 | mmap_write_lock(mm); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 505 | |
| 506 | vma = find_vma(mm, m.addr); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 507 | if (!vma || |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 508 | vma->vm_ops != &privcmd_vm_ops) { |
Mats Petersson | 68fa965 | 2012-11-16 18:36:49 +0000 | [diff] [blame] | 509 | ret = -EINVAL; |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 510 | goto out_unlock; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 511 | } |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 512 | |
| 513 | /* |
| 514 | * Caller must either: |
| 515 | * |
| 516 | * Map the whole VMA range, which will also allocate all the |
| 517 | * pages required for the auto_translated_physmap case. |
| 518 | * |
| 519 | * Or |
| 520 | * |
| 521 | * Map unmapped holes left from a previous map attempt (e.g., |
| 522 | * because those foreign frames were previously paged out). |
| 523 | */ |
| 524 | if (vma->vm_private_data == NULL) { |
| 525 | if (m.addr != vma->vm_start || |
| 526 | m.addr + (nr_pages << PAGE_SHIFT) != vma->vm_end) { |
| 527 | ret = -EINVAL; |
| 528 | goto out_unlock; |
| 529 | } |
| 530 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
Julien Grall | 5995a68 | 2015-05-05 16:54:12 +0100 | [diff] [blame] | 531 | ret = alloc_empty_pages(vma, nr_pages); |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 532 | if (ret < 0) |
| 533 | goto out_unlock; |
| 534 | } else |
| 535 | vma->vm_private_data = PRIV_VMA_LOCKED; |
| 536 | } else { |
| 537 | if (m.addr < vma->vm_start || |
| 538 | m.addr + (nr_pages << PAGE_SHIFT) > vma->vm_end) { |
| 539 | ret = -EINVAL; |
| 540 | goto out_unlock; |
| 541 | } |
| 542 | if (privcmd_vma_range_is_mapped(vma, m.addr, nr_pages)) { |
| 543 | ret = -EINVAL; |
| 544 | goto out_unlock; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 545 | } |
| 546 | } |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 547 | |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 548 | state.domain = m.dom; |
| 549 | state.vma = vma; |
| 550 | state.va = m.addr; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 551 | state.index = 0; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 552 | state.global_error = 0; |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 553 | state.version = version; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 554 | |
Julien Grall | 5995a68 | 2015-05-05 16:54:12 +0100 | [diff] [blame] | 555 | BUILD_BUG_ON(((PAGE_SIZE / sizeof(xen_pfn_t)) % XEN_PFN_PER_PAGE) != 0); |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 556 | /* mmap_batch_fn guarantees ret == 0 */ |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 557 | BUG_ON(traverse_pages_block(m.num, sizeof(xen_pfn_t), |
| 558 | &pagelist, mmap_batch_fn, &state)); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 559 | |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 560 | mmap_write_unlock(mm); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 561 | |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 562 | if (state.global_error) { |
| 563 | /* Write back errors in second pass. */ |
Julien Grall | a13d720 | 2015-08-07 17:34:41 +0100 | [diff] [blame] | 564 | state.user_gfn = (xen_pfn_t *)m.arr; |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 565 | state.user_err = m.err; |
David Vrabel | 4e8c0c8 | 2015-03-11 14:49:57 +0000 | [diff] [blame] | 566 | ret = traverse_pages_block(m.num, sizeof(xen_pfn_t), |
| 567 | &pagelist, mmap_return_errors, &state); |
Andres Lagar-Cavilla | 99beae6 | 2013-01-14 22:35:40 -0500 | [diff] [blame] | 568 | } else |
| 569 | ret = 0; |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 570 | |
| 571 | /* If we have not had any EFAULT-like global errors then set the global |
| 572 | * error to -ENOENT if necessary. */ |
| 573 | if ((ret == 0) && (state.global_error == -ENOENT)) |
| 574 | ret = -ENOENT; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 575 | |
| 576 | out: |
| 577 | free_page_list(&pagelist); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 578 | return ret; |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 579 | |
| 580 | out_unlock: |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 581 | mmap_write_unlock(mm); |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 582 | goto out; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 583 | } |
| 584 | |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 585 | static int lock_pages( |
| 586 | struct privcmd_dm_op_buf kbufs[], unsigned int num, |
Souptick Joarder | e398fb4 | 2020-07-12 09:09:53 +0530 | [diff] [blame] | 587 | struct page *pages[], unsigned int nr_pages, unsigned int *pinned) |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 588 | { |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 589 | unsigned int i, off = 0; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 590 | |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 591 | for (i = 0; i < num; ) { |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 592 | unsigned int requested; |
Souptick Joarder | e398fb4 | 2020-07-12 09:09:53 +0530 | [diff] [blame] | 593 | int page_count; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 594 | |
| 595 | requested = DIV_ROUND_UP( |
| 596 | offset_in_page(kbufs[i].uptr) + kbufs[i].size, |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 597 | PAGE_SIZE) - off; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 598 | if (requested > nr_pages) |
| 599 | return -ENOSPC; |
| 600 | |
Souptick Joarder | ff669aa | 2020-07-12 09:09:55 +0530 | [diff] [blame] | 601 | page_count = pin_user_pages_fast( |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 602 | (unsigned long)kbufs[i].uptr + off * PAGE_SIZE, |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 603 | requested, FOLL_WRITE, pages); |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 604 | if (page_count <= 0) |
| 605 | return page_count ? : -EFAULT; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 606 | |
Souptick Joarder | e398fb4 | 2020-07-12 09:09:53 +0530 | [diff] [blame] | 607 | *pinned += page_count; |
| 608 | nr_pages -= page_count; |
| 609 | pages += page_count; |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 610 | |
| 611 | off = (requested == page_count) ? 0 : off + page_count; |
| 612 | i += !off; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | static void unlock_pages(struct page *pages[], unsigned int nr_pages) |
| 619 | { |
Souptick Joarder | ff669aa | 2020-07-12 09:09:55 +0530 | [diff] [blame] | 620 | unpin_user_pages_dirty_lock(pages, nr_pages, true); |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 621 | } |
| 622 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 623 | static long privcmd_ioctl_dm_op(struct file *file, void __user *udata) |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 624 | { |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 625 | struct privcmd_data *data = file->private_data; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 626 | struct privcmd_dm_op kdata; |
| 627 | struct privcmd_dm_op_buf *kbufs; |
| 628 | unsigned int nr_pages = 0; |
| 629 | struct page **pages = NULL; |
| 630 | struct xen_dm_op_buf *xbufs = NULL; |
| 631 | unsigned int i; |
| 632 | long rc; |
Souptick Joarder | e398fb4 | 2020-07-12 09:09:53 +0530 | [diff] [blame] | 633 | unsigned int pinned = 0; |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 634 | |
| 635 | if (copy_from_user(&kdata, udata, sizeof(kdata))) |
| 636 | return -EFAULT; |
| 637 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 638 | /* If restriction is in place, check the domid matches */ |
| 639 | if (data->domid != DOMID_INVALID && data->domid != kdata.dom) |
| 640 | return -EPERM; |
| 641 | |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 642 | if (kdata.num == 0) |
| 643 | return 0; |
| 644 | |
| 645 | if (kdata.num > privcmd_dm_op_max_num) |
| 646 | return -E2BIG; |
| 647 | |
| 648 | kbufs = kcalloc(kdata.num, sizeof(*kbufs), GFP_KERNEL); |
| 649 | if (!kbufs) |
| 650 | return -ENOMEM; |
| 651 | |
| 652 | if (copy_from_user(kbufs, kdata.ubufs, |
| 653 | sizeof(*kbufs) * kdata.num)) { |
| 654 | rc = -EFAULT; |
| 655 | goto out; |
| 656 | } |
| 657 | |
| 658 | for (i = 0; i < kdata.num; i++) { |
| 659 | if (kbufs[i].size > privcmd_dm_op_buf_max_size) { |
| 660 | rc = -E2BIG; |
| 661 | goto out; |
| 662 | } |
| 663 | |
Linus Torvalds | 96d4f26 | 2019-01-03 18:57:57 -0800 | [diff] [blame] | 664 | if (!access_ok(kbufs[i].uptr, |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 665 | kbufs[i].size)) { |
| 666 | rc = -EFAULT; |
| 667 | goto out; |
| 668 | } |
| 669 | |
| 670 | nr_pages += DIV_ROUND_UP( |
| 671 | offset_in_page(kbufs[i].uptr) + kbufs[i].size, |
| 672 | PAGE_SIZE); |
| 673 | } |
| 674 | |
| 675 | pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL); |
| 676 | if (!pages) { |
| 677 | rc = -ENOMEM; |
| 678 | goto out; |
| 679 | } |
| 680 | |
| 681 | xbufs = kcalloc(kdata.num, sizeof(*xbufs), GFP_KERNEL); |
| 682 | if (!xbufs) { |
| 683 | rc = -ENOMEM; |
| 684 | goto out; |
| 685 | } |
| 686 | |
Souptick Joarder | e398fb4 | 2020-07-12 09:09:53 +0530 | [diff] [blame] | 687 | rc = lock_pages(kbufs, kdata.num, pages, nr_pages, &pinned); |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 688 | if (rc < 0) |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 689 | goto out; |
| 690 | |
| 691 | for (i = 0; i < kdata.num; i++) { |
| 692 | set_xen_guest_handle(xbufs[i].h, kbufs[i].uptr); |
| 693 | xbufs[i].size = kbufs[i].size; |
| 694 | } |
| 695 | |
| 696 | xen_preemptible_hcall_begin(); |
| 697 | rc = HYPERVISOR_dm_op(kdata.dom, kdata.num, xbufs); |
| 698 | xen_preemptible_hcall_end(); |
| 699 | |
| 700 | out: |
Juergen Gross | c5deb278 | 2022-08-25 16:19:18 +0200 | [diff] [blame] | 701 | unlock_pages(pages, pinned); |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 702 | kfree(xbufs); |
| 703 | kfree(pages); |
| 704 | kfree(kbufs); |
| 705 | |
| 706 | return rc; |
| 707 | } |
| 708 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 709 | static long privcmd_ioctl_restrict(struct file *file, void __user *udata) |
| 710 | { |
| 711 | struct privcmd_data *data = file->private_data; |
| 712 | domid_t dom; |
| 713 | |
| 714 | if (copy_from_user(&dom, udata, sizeof(dom))) |
| 715 | return -EFAULT; |
| 716 | |
| 717 | /* Set restriction to the specified domain, or check it matches */ |
| 718 | if (data->domid == DOMID_INVALID) |
| 719 | data->domid = dom; |
| 720 | else if (data->domid != dom) |
| 721 | return -EINVAL; |
| 722 | |
| 723 | return 0; |
| 724 | } |
| 725 | |
Roger Pau Monne | ef3a575 | 2021-01-12 12:53:58 +0100 | [diff] [blame] | 726 | static long privcmd_ioctl_mmap_resource(struct file *file, |
| 727 | struct privcmd_mmap_resource __user *udata) |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 728 | { |
| 729 | struct privcmd_data *data = file->private_data; |
| 730 | struct mm_struct *mm = current->mm; |
| 731 | struct vm_area_struct *vma; |
| 732 | struct privcmd_mmap_resource kdata; |
| 733 | xen_pfn_t *pfns = NULL; |
Roger Pau Monne | ef3a575 | 2021-01-12 12:53:58 +0100 | [diff] [blame] | 734 | struct xen_mem_acquire_resource xdata = { }; |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 735 | int rc; |
| 736 | |
| 737 | if (copy_from_user(&kdata, udata, sizeof(kdata))) |
| 738 | return -EFAULT; |
| 739 | |
| 740 | /* If restriction is in place, check the domid matches */ |
| 741 | if (data->domid != DOMID_INVALID && data->domid != kdata.dom) |
| 742 | return -EPERM; |
| 743 | |
Roger Pau Monne | ef3a575 | 2021-01-12 12:53:58 +0100 | [diff] [blame] | 744 | /* Both fields must be set or unset */ |
| 745 | if (!!kdata.addr != !!kdata.num) |
| 746 | return -EINVAL; |
| 747 | |
| 748 | xdata.domid = kdata.dom; |
| 749 | xdata.type = kdata.type; |
| 750 | xdata.id = kdata.id; |
| 751 | |
| 752 | if (!kdata.addr && !kdata.num) { |
| 753 | /* Query the size of the resource. */ |
| 754 | rc = HYPERVISOR_memory_op(XENMEM_acquire_resource, &xdata); |
| 755 | if (rc) |
| 756 | return rc; |
| 757 | return __put_user(xdata.nr_frames, &udata->num); |
| 758 | } |
| 759 | |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 760 | mmap_write_lock(mm); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 761 | |
| 762 | vma = find_vma(mm, kdata.addr); |
| 763 | if (!vma || vma->vm_ops != &privcmd_vm_ops) { |
| 764 | rc = -EINVAL; |
| 765 | goto out; |
| 766 | } |
| 767 | |
Harshit Mogalapalli | 8b997b2 | 2022-11-25 21:07:45 -0800 | [diff] [blame] | 768 | pfns = kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL | __GFP_NOWARN); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 769 | if (!pfns) { |
| 770 | rc = -ENOMEM; |
| 771 | goto out; |
| 772 | } |
| 773 | |
Arnd Bergmann | a78d14a | 2019-07-22 09:46:29 +0200 | [diff] [blame] | 774 | if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) && |
| 775 | xen_feature(XENFEAT_auto_translated_physmap)) { |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 776 | unsigned int nr = DIV_ROUND_UP(kdata.num, XEN_PFN_PER_PAGE); |
| 777 | struct page **pages; |
| 778 | unsigned int i; |
| 779 | |
| 780 | rc = alloc_empty_pages(vma, nr); |
| 781 | if (rc < 0) |
| 782 | goto out; |
| 783 | |
| 784 | pages = vma->vm_private_data; |
| 785 | for (i = 0; i < kdata.num; i++) { |
| 786 | xen_pfn_t pfn = |
| 787 | page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]); |
| 788 | |
| 789 | pfns[i] = pfn + (i % XEN_PFN_PER_PAGE); |
| 790 | } |
| 791 | } else |
| 792 | vma->vm_private_data = PRIV_VMA_LOCKED; |
| 793 | |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 794 | xdata.frame = kdata.idx; |
| 795 | xdata.nr_frames = kdata.num; |
| 796 | set_xen_guest_handle(xdata.frame_list, pfns); |
| 797 | |
| 798 | xen_preemptible_hcall_begin(); |
| 799 | rc = HYPERVISOR_memory_op(XENMEM_acquire_resource, &xdata); |
| 800 | xen_preemptible_hcall_end(); |
| 801 | |
| 802 | if (rc) |
| 803 | goto out; |
| 804 | |
Arnd Bergmann | a78d14a | 2019-07-22 09:46:29 +0200 | [diff] [blame] | 805 | if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) && |
| 806 | xen_feature(XENFEAT_auto_translated_physmap)) { |
| 807 | rc = xen_remap_vma_range(vma, kdata.addr, kdata.num << PAGE_SHIFT); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 808 | } else { |
| 809 | unsigned int domid = |
| 810 | (xdata.flags & XENMEM_rsrc_acq_caller_owned) ? |
| 811 | DOMID_SELF : kdata.dom; |
Jan Beulich | e11423d | 2021-09-22 12:17:48 +0200 | [diff] [blame] | 812 | int num, *errs = (int *)pfns; |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 813 | |
Jan Beulich | e11423d | 2021-09-22 12:17:48 +0200 | [diff] [blame] | 814 | BUILD_BUG_ON(sizeof(*errs) > sizeof(*pfns)); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 815 | num = xen_remap_domain_mfn_array(vma, |
| 816 | kdata.addr & PAGE_MASK, |
Jan Beulich | e11423d | 2021-09-22 12:17:48 +0200 | [diff] [blame] | 817 | pfns, kdata.num, errs, |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 818 | vma->vm_page_prot, |
Jan Beulich | 9731572 | 2021-09-22 12:18:25 +0200 | [diff] [blame] | 819 | domid); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 820 | if (num < 0) |
| 821 | rc = num; |
| 822 | else if (num != kdata.num) { |
| 823 | unsigned int i; |
| 824 | |
| 825 | for (i = 0; i < num; i++) { |
Jan Beulich | e11423d | 2021-09-22 12:17:48 +0200 | [diff] [blame] | 826 | rc = errs[i]; |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 827 | if (rc < 0) |
| 828 | break; |
| 829 | } |
| 830 | } else |
| 831 | rc = 0; |
| 832 | } |
| 833 | |
| 834 | out: |
Michel Lespinasse | d8ed45c | 2020-06-08 21:33:25 -0700 | [diff] [blame] | 835 | mmap_write_unlock(mm); |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 836 | kfree(pfns); |
| 837 | |
| 838 | return rc; |
| 839 | } |
| 840 | |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 841 | #ifdef CONFIG_XEN_PRIVCMD_IRQFD |
| 842 | /* Irqfd support */ |
| 843 | static struct workqueue_struct *irqfd_cleanup_wq; |
| 844 | static DEFINE_MUTEX(irqfds_lock); |
| 845 | static LIST_HEAD(irqfds_list); |
| 846 | |
| 847 | struct privcmd_kernel_irqfd { |
| 848 | struct xen_dm_op_buf xbufs; |
| 849 | domid_t dom; |
| 850 | bool error; |
| 851 | struct eventfd_ctx *eventfd; |
| 852 | struct work_struct shutdown; |
| 853 | wait_queue_entry_t wait; |
| 854 | struct list_head list; |
| 855 | poll_table pt; |
| 856 | }; |
| 857 | |
| 858 | static void irqfd_deactivate(struct privcmd_kernel_irqfd *kirqfd) |
| 859 | { |
| 860 | lockdep_assert_held(&irqfds_lock); |
| 861 | |
| 862 | list_del_init(&kirqfd->list); |
| 863 | queue_work(irqfd_cleanup_wq, &kirqfd->shutdown); |
| 864 | } |
| 865 | |
| 866 | static void irqfd_shutdown(struct work_struct *work) |
| 867 | { |
| 868 | struct privcmd_kernel_irqfd *kirqfd = |
| 869 | container_of(work, struct privcmd_kernel_irqfd, shutdown); |
| 870 | u64 cnt; |
| 871 | |
| 872 | eventfd_ctx_remove_wait_queue(kirqfd->eventfd, &kirqfd->wait, &cnt); |
| 873 | eventfd_ctx_put(kirqfd->eventfd); |
| 874 | kfree(kirqfd); |
| 875 | } |
| 876 | |
| 877 | static void irqfd_inject(struct privcmd_kernel_irqfd *kirqfd) |
| 878 | { |
| 879 | u64 cnt; |
| 880 | long rc; |
| 881 | |
| 882 | eventfd_ctx_do_read(kirqfd->eventfd, &cnt); |
| 883 | |
| 884 | xen_preemptible_hcall_begin(); |
| 885 | rc = HYPERVISOR_dm_op(kirqfd->dom, 1, &kirqfd->xbufs); |
| 886 | xen_preemptible_hcall_end(); |
| 887 | |
| 888 | /* Don't repeat the error message for consecutive failures */ |
| 889 | if (rc && !kirqfd->error) { |
| 890 | pr_err("Failed to configure irq for guest domain: %d\n", |
| 891 | kirqfd->dom); |
| 892 | } |
| 893 | |
| 894 | kirqfd->error = rc; |
| 895 | } |
| 896 | |
| 897 | static int |
| 898 | irqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key) |
| 899 | { |
| 900 | struct privcmd_kernel_irqfd *kirqfd = |
| 901 | container_of(wait, struct privcmd_kernel_irqfd, wait); |
| 902 | __poll_t flags = key_to_poll(key); |
| 903 | |
| 904 | if (flags & EPOLLIN) |
| 905 | irqfd_inject(kirqfd); |
| 906 | |
| 907 | if (flags & EPOLLHUP) { |
| 908 | mutex_lock(&irqfds_lock); |
| 909 | irqfd_deactivate(kirqfd); |
| 910 | mutex_unlock(&irqfds_lock); |
| 911 | } |
| 912 | |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | static void |
| 917 | irqfd_poll_func(struct file *file, wait_queue_head_t *wqh, poll_table *pt) |
| 918 | { |
| 919 | struct privcmd_kernel_irqfd *kirqfd = |
| 920 | container_of(pt, struct privcmd_kernel_irqfd, pt); |
| 921 | |
| 922 | add_wait_queue_priority(wqh, &kirqfd->wait); |
| 923 | } |
| 924 | |
| 925 | static int privcmd_irqfd_assign(struct privcmd_irqfd *irqfd) |
| 926 | { |
| 927 | struct privcmd_kernel_irqfd *kirqfd, *tmp; |
| 928 | __poll_t events; |
| 929 | struct fd f; |
| 930 | void *dm_op; |
| 931 | int ret; |
| 932 | |
| 933 | kirqfd = kzalloc(sizeof(*kirqfd) + irqfd->size, GFP_KERNEL); |
| 934 | if (!kirqfd) |
| 935 | return -ENOMEM; |
| 936 | dm_op = kirqfd + 1; |
| 937 | |
| 938 | if (copy_from_user(dm_op, irqfd->dm_op, irqfd->size)) { |
| 939 | ret = -EFAULT; |
| 940 | goto error_kfree; |
| 941 | } |
| 942 | |
| 943 | kirqfd->xbufs.size = irqfd->size; |
| 944 | set_xen_guest_handle(kirqfd->xbufs.h, dm_op); |
| 945 | kirqfd->dom = irqfd->dom; |
| 946 | INIT_WORK(&kirqfd->shutdown, irqfd_shutdown); |
| 947 | |
| 948 | f = fdget(irqfd->fd); |
| 949 | if (!f.file) { |
| 950 | ret = -EBADF; |
| 951 | goto error_kfree; |
| 952 | } |
| 953 | |
| 954 | kirqfd->eventfd = eventfd_ctx_fileget(f.file); |
| 955 | if (IS_ERR(kirqfd->eventfd)) { |
| 956 | ret = PTR_ERR(kirqfd->eventfd); |
| 957 | goto error_fd_put; |
| 958 | } |
| 959 | |
| 960 | /* |
| 961 | * Install our own custom wake-up handling so we are notified via a |
| 962 | * callback whenever someone signals the underlying eventfd. |
| 963 | */ |
| 964 | init_waitqueue_func_entry(&kirqfd->wait, irqfd_wakeup); |
| 965 | init_poll_funcptr(&kirqfd->pt, irqfd_poll_func); |
| 966 | |
| 967 | mutex_lock(&irqfds_lock); |
| 968 | |
| 969 | list_for_each_entry(tmp, &irqfds_list, list) { |
| 970 | if (kirqfd->eventfd == tmp->eventfd) { |
| 971 | ret = -EBUSY; |
| 972 | mutex_unlock(&irqfds_lock); |
| 973 | goto error_eventfd; |
| 974 | } |
| 975 | } |
| 976 | |
| 977 | list_add_tail(&kirqfd->list, &irqfds_list); |
| 978 | mutex_unlock(&irqfds_lock); |
| 979 | |
| 980 | /* |
| 981 | * Check if there was an event already pending on the eventfd before we |
| 982 | * registered, and trigger it as if we didn't miss it. |
| 983 | */ |
| 984 | events = vfs_poll(f.file, &kirqfd->pt); |
| 985 | if (events & EPOLLIN) |
| 986 | irqfd_inject(kirqfd); |
| 987 | |
| 988 | /* |
| 989 | * Do not drop the file until the kirqfd is fully initialized, otherwise |
| 990 | * we might race against the EPOLLHUP. |
| 991 | */ |
| 992 | fdput(f); |
| 993 | return 0; |
| 994 | |
| 995 | error_eventfd: |
| 996 | eventfd_ctx_put(kirqfd->eventfd); |
| 997 | |
| 998 | error_fd_put: |
| 999 | fdput(f); |
| 1000 | |
| 1001 | error_kfree: |
| 1002 | kfree(kirqfd); |
| 1003 | return ret; |
| 1004 | } |
| 1005 | |
| 1006 | static int privcmd_irqfd_deassign(struct privcmd_irqfd *irqfd) |
| 1007 | { |
| 1008 | struct privcmd_kernel_irqfd *kirqfd; |
| 1009 | struct eventfd_ctx *eventfd; |
| 1010 | |
| 1011 | eventfd = eventfd_ctx_fdget(irqfd->fd); |
| 1012 | if (IS_ERR(eventfd)) |
| 1013 | return PTR_ERR(eventfd); |
| 1014 | |
| 1015 | mutex_lock(&irqfds_lock); |
| 1016 | |
| 1017 | list_for_each_entry(kirqfd, &irqfds_list, list) { |
| 1018 | if (kirqfd->eventfd == eventfd) { |
| 1019 | irqfd_deactivate(kirqfd); |
| 1020 | break; |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | mutex_unlock(&irqfds_lock); |
| 1025 | |
| 1026 | eventfd_ctx_put(eventfd); |
| 1027 | |
| 1028 | /* |
| 1029 | * Block until we know all outstanding shutdown jobs have completed so |
| 1030 | * that we guarantee there will not be any more interrupts once this |
| 1031 | * deassign function returns. |
| 1032 | */ |
| 1033 | flush_workqueue(irqfd_cleanup_wq); |
| 1034 | |
| 1035 | return 0; |
| 1036 | } |
| 1037 | |
| 1038 | static long privcmd_ioctl_irqfd(struct file *file, void __user *udata) |
| 1039 | { |
| 1040 | struct privcmd_data *data = file->private_data; |
| 1041 | struct privcmd_irqfd irqfd; |
| 1042 | |
| 1043 | if (copy_from_user(&irqfd, udata, sizeof(irqfd))) |
| 1044 | return -EFAULT; |
| 1045 | |
| 1046 | /* No other flags should be set */ |
| 1047 | if (irqfd.flags & ~PRIVCMD_IRQFD_FLAG_DEASSIGN) |
| 1048 | return -EINVAL; |
| 1049 | |
| 1050 | /* If restriction is in place, check the domid matches */ |
| 1051 | if (data->domid != DOMID_INVALID && data->domid != irqfd.dom) |
| 1052 | return -EPERM; |
| 1053 | |
| 1054 | if (irqfd.flags & PRIVCMD_IRQFD_FLAG_DEASSIGN) |
| 1055 | return privcmd_irqfd_deassign(&irqfd); |
| 1056 | |
| 1057 | return privcmd_irqfd_assign(&irqfd); |
| 1058 | } |
| 1059 | |
| 1060 | static int privcmd_irqfd_init(void) |
| 1061 | { |
| 1062 | irqfd_cleanup_wq = alloc_workqueue("privcmd-irqfd-cleanup", 0, 0); |
| 1063 | if (!irqfd_cleanup_wq) |
| 1064 | return -ENOMEM; |
| 1065 | |
| 1066 | return 0; |
| 1067 | } |
| 1068 | |
| 1069 | static void privcmd_irqfd_exit(void) |
| 1070 | { |
| 1071 | struct privcmd_kernel_irqfd *kirqfd, *tmp; |
| 1072 | |
| 1073 | mutex_lock(&irqfds_lock); |
| 1074 | |
| 1075 | list_for_each_entry_safe(kirqfd, tmp, &irqfds_list, list) |
| 1076 | irqfd_deactivate(kirqfd); |
| 1077 | |
| 1078 | mutex_unlock(&irqfds_lock); |
| 1079 | |
| 1080 | destroy_workqueue(irqfd_cleanup_wq); |
| 1081 | } |
| 1082 | #else |
| 1083 | static inline long privcmd_ioctl_irqfd(struct file *file, void __user *udata) |
| 1084 | { |
| 1085 | return -EOPNOTSUPP; |
| 1086 | } |
| 1087 | |
| 1088 | static inline int privcmd_irqfd_init(void) |
| 1089 | { |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | static inline void privcmd_irqfd_exit(void) |
| 1094 | { |
| 1095 | } |
| 1096 | #endif /* CONFIG_XEN_PRIVCMD_IRQFD */ |
| 1097 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1098 | static long privcmd_ioctl(struct file *file, |
| 1099 | unsigned int cmd, unsigned long data) |
| 1100 | { |
Paul Durrant | dc9eab6 | 2017-02-13 17:03:22 +0000 | [diff] [blame] | 1101 | int ret = -ENOTTY; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1102 | void __user *udata = (void __user *) data; |
| 1103 | |
| 1104 | switch (cmd) { |
| 1105 | case IOCTL_PRIVCMD_HYPERCALL: |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1106 | ret = privcmd_ioctl_hypercall(file, udata); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1107 | break; |
| 1108 | |
| 1109 | case IOCTL_PRIVCMD_MMAP: |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1110 | ret = privcmd_ioctl_mmap(file, udata); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1111 | break; |
| 1112 | |
| 1113 | case IOCTL_PRIVCMD_MMAPBATCH: |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1114 | ret = privcmd_ioctl_mmap_batch(file, udata, 1); |
Andres Lagar-Cavilla | ceb90fa | 2012-08-31 09:59:30 -0400 | [diff] [blame] | 1115 | break; |
| 1116 | |
| 1117 | case IOCTL_PRIVCMD_MMAPBATCH_V2: |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1118 | ret = privcmd_ioctl_mmap_batch(file, udata, 2); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1119 | break; |
| 1120 | |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 1121 | case IOCTL_PRIVCMD_DM_OP: |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1122 | ret = privcmd_ioctl_dm_op(file, udata); |
| 1123 | break; |
| 1124 | |
| 1125 | case IOCTL_PRIVCMD_RESTRICT: |
| 1126 | ret = privcmd_ioctl_restrict(file, udata); |
Paul Durrant | ab520be | 2017-02-13 17:03:23 +0000 | [diff] [blame] | 1127 | break; |
| 1128 | |
Paul Durrant | 3ad0876 | 2018-05-09 14:16:12 +0100 | [diff] [blame] | 1129 | case IOCTL_PRIVCMD_MMAP_RESOURCE: |
| 1130 | ret = privcmd_ioctl_mmap_resource(file, udata); |
| 1131 | break; |
| 1132 | |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 1133 | case IOCTL_PRIVCMD_IRQFD: |
| 1134 | ret = privcmd_ioctl_irqfd(file, udata); |
| 1135 | break; |
| 1136 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1137 | default: |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1138 | break; |
| 1139 | } |
| 1140 | |
| 1141 | return ret; |
| 1142 | } |
| 1143 | |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1144 | static int privcmd_open(struct inode *ino, struct file *file) |
| 1145 | { |
| 1146 | struct privcmd_data *data = kzalloc(sizeof(*data), GFP_KERNEL); |
| 1147 | |
| 1148 | if (!data) |
| 1149 | return -ENOMEM; |
| 1150 | |
| 1151 | /* DOMID_INVALID implies no restriction */ |
| 1152 | data->domid = DOMID_INVALID; |
| 1153 | |
| 1154 | file->private_data = data; |
| 1155 | return 0; |
| 1156 | } |
| 1157 | |
| 1158 | static int privcmd_release(struct inode *ino, struct file *file) |
| 1159 | { |
| 1160 | struct privcmd_data *data = file->private_data; |
| 1161 | |
| 1162 | kfree(data); |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 1166 | static void privcmd_close(struct vm_area_struct *vma) |
| 1167 | { |
| 1168 | struct page **pages = vma->vm_private_data; |
Muhammad Falak R Wani | c7ebf9d | 2016-05-24 05:34:32 +0530 | [diff] [blame] | 1169 | int numpgs = vma_pages(vma); |
Julien Grall | 5995a68 | 2015-05-05 16:54:12 +0100 | [diff] [blame] | 1170 | int numgfns = (vma->vm_end - vma->vm_start) >> XEN_PAGE_SHIFT; |
Ian Campbell | b6497b3 | 2013-12-06 17:55:56 +0000 | [diff] [blame] | 1171 | int rc; |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 1172 | |
Dan Carpenter | 9eff37a | 2012-11-05 09:42:17 +0300 | [diff] [blame] | 1173 | if (!xen_feature(XENFEAT_auto_translated_physmap) || !numpgs || !pages) |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 1174 | return; |
| 1175 | |
Julien Grall | 5995a68 | 2015-05-05 16:54:12 +0100 | [diff] [blame] | 1176 | rc = xen_unmap_domain_gfn_range(vma, numgfns, pages); |
Ian Campbell | b6497b3 | 2013-12-06 17:55:56 +0000 | [diff] [blame] | 1177 | if (rc == 0) |
Roger Pau Monne | 9e2369c | 2020-09-01 10:33:26 +0200 | [diff] [blame] | 1178 | xen_free_unpopulated_pages(numpgs, pages); |
Ian Campbell | b6497b3 | 2013-12-06 17:55:56 +0000 | [diff] [blame] | 1179 | else |
| 1180 | pr_crit("unable to unmap MFN range: leaking %d pages. rc=%d\n", |
| 1181 | numpgs, rc); |
Jan Beulich | 0432523 | 2021-09-22 12:16:35 +0200 | [diff] [blame] | 1182 | kvfree(pages); |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 1183 | } |
| 1184 | |
Souptick Joarder | 4bf2cc9 | 2018-04-15 00:45:42 +0530 | [diff] [blame] | 1185 | static vm_fault_t privcmd_fault(struct vm_fault *vmf) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1186 | { |
Jeremy Fitzhardinge | 441c741 | 2009-03-06 09:56:59 -0800 | [diff] [blame] | 1187 | printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n", |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1188 | vmf->vma, vmf->vma->vm_start, vmf->vma->vm_end, |
Jan Kara | 1a29d85 | 2016-12-14 15:07:01 -0800 | [diff] [blame] | 1189 | vmf->pgoff, (void *)vmf->address); |
Jeremy Fitzhardinge | 441c741 | 2009-03-06 09:56:59 -0800 | [diff] [blame] | 1190 | |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1191 | return VM_FAULT_SIGBUS; |
| 1192 | } |
| 1193 | |
Kirill A. Shutemov | 7cbea8d | 2015-09-09 15:39:26 -0700 | [diff] [blame] | 1194 | static const struct vm_operations_struct privcmd_vm_ops = { |
Mukesh Rathor | d71f513 | 2012-10-17 17:11:21 -0700 | [diff] [blame] | 1195 | .close = privcmd_close, |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1196 | .fault = privcmd_fault |
| 1197 | }; |
| 1198 | |
| 1199 | static int privcmd_mmap(struct file *file, struct vm_area_struct *vma) |
| 1200 | { |
Stefano Stabellini | e060e7af | 2010-11-11 12:37:43 -0800 | [diff] [blame] | 1201 | /* DONTCOPY is essential for Xen because copy_page_range doesn't know |
| 1202 | * how to recreate these mappings */ |
Suren Baghdasaryan | 1c71222 | 2023-01-26 11:37:49 -0800 | [diff] [blame] | 1203 | vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTCOPY | |
| 1204 | VM_DONTEXPAND | VM_DONTDUMP); |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1205 | vma->vm_ops = &privcmd_vm_ops; |
| 1206 | vma->vm_private_data = NULL; |
| 1207 | |
| 1208 | return 0; |
| 1209 | } |
| 1210 | |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 1211 | /* |
| 1212 | * For MMAPBATCH*. This allows asserting the singleshot mapping |
| 1213 | * on a per pfn/pte basis. Mapping calls that fail with ENOENT |
| 1214 | * can be then retried until success. |
| 1215 | */ |
Anshuman Khandual | 8b1e0f8 | 2019-07-11 20:58:43 -0700 | [diff] [blame] | 1216 | static int is_mapped_fn(pte_t *pte, unsigned long addr, void *data) |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1217 | { |
Ryan Roberts | c33c794 | 2023-06-12 16:15:45 +0100 | [diff] [blame] | 1218 | return pte_none(ptep_get(pte)) ? 0 : -EBUSY; |
Andres Lagar-Cavilla | a5deabe | 2013-08-23 18:10:06 +0100 | [diff] [blame] | 1219 | } |
| 1220 | |
| 1221 | static int privcmd_vma_range_is_mapped( |
| 1222 | struct vm_area_struct *vma, |
| 1223 | unsigned long addr, |
| 1224 | unsigned long nr_pages) |
| 1225 | { |
| 1226 | return apply_to_page_range(vma->vm_mm, addr, nr_pages << PAGE_SHIFT, |
| 1227 | is_mapped_fn, NULL) != 0; |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1228 | } |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1229 | |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1230 | const struct file_operations xen_privcmd_fops = { |
| 1231 | .owner = THIS_MODULE, |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1232 | .unlocked_ioctl = privcmd_ioctl, |
Paul Durrant | 4610d24 | 2017-02-13 17:03:24 +0000 | [diff] [blame] | 1233 | .open = privcmd_open, |
| 1234 | .release = privcmd_release, |
Jeremy Fitzhardinge | 1c5de19 | 2009-02-09 12:05:49 -0800 | [diff] [blame] | 1235 | .mmap = privcmd_mmap, |
| 1236 | }; |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1237 | EXPORT_SYMBOL_GPL(xen_privcmd_fops); |
| 1238 | |
| 1239 | static struct miscdevice privcmd_dev = { |
| 1240 | .minor = MISC_DYNAMIC_MINOR, |
| 1241 | .name = "xen/privcmd", |
| 1242 | .fops = &xen_privcmd_fops, |
| 1243 | }; |
| 1244 | |
| 1245 | static int __init privcmd_init(void) |
| 1246 | { |
| 1247 | int err; |
| 1248 | |
| 1249 | if (!xen_domain()) |
| 1250 | return -ENODEV; |
| 1251 | |
| 1252 | err = misc_register(&privcmd_dev); |
| 1253 | if (err != 0) { |
Joe Perches | 283c097 | 2013-06-28 03:21:41 -0700 | [diff] [blame] | 1254 | pr_err("Could not register Xen privcmd device\n"); |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1255 | return err; |
| 1256 | } |
Juergen Gross | c51b3c6 | 2018-06-18 09:36:39 +0200 | [diff] [blame] | 1257 | |
| 1258 | err = misc_register(&xen_privcmdbuf_dev); |
| 1259 | if (err != 0) { |
| 1260 | pr_err("Could not register Xen hypercall-buf device\n"); |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 1261 | goto err_privcmdbuf; |
| 1262 | } |
| 1263 | |
| 1264 | err = privcmd_irqfd_init(); |
| 1265 | if (err != 0) { |
| 1266 | pr_err("irqfd init failed\n"); |
| 1267 | goto err_irqfd; |
Juergen Gross | c51b3c6 | 2018-06-18 09:36:39 +0200 | [diff] [blame] | 1268 | } |
| 1269 | |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1270 | return 0; |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 1271 | |
| 1272 | err_irqfd: |
| 1273 | misc_deregister(&xen_privcmdbuf_dev); |
| 1274 | err_privcmdbuf: |
| 1275 | misc_deregister(&privcmd_dev); |
| 1276 | return err; |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1277 | } |
| 1278 | |
| 1279 | static void __exit privcmd_exit(void) |
| 1280 | { |
Viresh Kumar | f8941e6 | 2023-08-22 15:15:07 +0530 | [diff] [blame] | 1281 | privcmd_irqfd_exit(); |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1282 | misc_deregister(&privcmd_dev); |
Juergen Gross | c51b3c6 | 2018-06-18 09:36:39 +0200 | [diff] [blame] | 1283 | misc_deregister(&xen_privcmdbuf_dev); |
Bastian Blank | d8414d3 | 2011-12-16 11:34:33 -0500 | [diff] [blame] | 1284 | } |
| 1285 | |
| 1286 | module_init(privcmd_init); |
| 1287 | module_exit(privcmd_exit); |