ia64/xen-unstable

annotate xen/common/memory.c @ 18574:9a7b46546e05

Eliminate code duplication with rcu_lock_domain_by_id().

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Oct 02 11:39:36 2008 +0100 (2008-10-02)
parents 5eaec8296a22
children bd33ff263e2c
rev   line source
kaf24@6486 1 /******************************************************************************
kaf24@6486 2 * memory.c
kaf24@6486 3 *
kaf24@6486 4 * Code to handle memory-related requests.
kaf24@6486 5 *
kaf24@6486 6 * Copyright (c) 2003-2004, B Dragovic
kaf24@6486 7 * Copyright (c) 2003-2005, K A Fraser
kaf24@6486 8 */
kaf24@6486 9
kaf24@6486 10 #include <xen/config.h>
kaf24@6486 11 #include <xen/types.h>
kaf24@6486 12 #include <xen/lib.h>
kaf24@6486 13 #include <xen/mm.h>
kaf24@6486 14 #include <xen/perfc.h>
kaf24@6486 15 #include <xen/sched.h>
kaf24@6486 16 #include <xen/event.h>
Tim@15635 17 #include <xen/paging.h>
kaf24@8468 18 #include <xen/iocap.h>
kaf24@9068 19 #include <xen/guest_access.h>
ack@13295 20 #include <xen/hypercall.h>
kaf24@11219 21 #include <xen/errno.h>
kaf24@6486 22 #include <asm/current.h>
kaf24@6486 23 #include <asm/hardirq.h>
keir@17385 24 #include <xen/numa.h>
kaf24@6486 25 #include <public/memory.h>
kfraser@15815 26 #include <xsm/xsm.h>
kaf24@6486 27
kfraser@12374 28 struct memop_args {
kfraser@12374 29 /* INPUT */
kfraser@12374 30 struct domain *domain; /* Domain to be affected. */
kfraser@12374 31 XEN_GUEST_HANDLE(xen_pfn_t) extent_list; /* List of extent base addrs. */
kfraser@12374 32 unsigned int nr_extents; /* Number of extents to allocate or free. */
kfraser@12374 33 unsigned int extent_order; /* Size of each extent. */
kfraser@12374 34 unsigned int memflags; /* Allocation flags. */
kfraser@12374 35
kfraser@12374 36 /* INPUT/OUTPUT */
kfraser@12374 37 unsigned int nr_done; /* Number of extents processed so far. */
kfraser@12374 38 int preempted; /* Was the hypercall preempted? */
kfraser@12374 39 };
kfraser@12374 40
kfraser@12374 41 static void increase_reservation(struct memop_args *a)
kaf24@6486 42 {
kaf24@8726 43 struct page_info *page;
kaf24@10314 44 unsigned long i;
kaf24@10314 45 xen_pfn_t mfn;
kfraser@12374 46 struct domain *d = a->domain;
kaf24@6486 47
kfraser@12374 48 if ( !guest_handle_is_null(a->extent_list) &&
keir@17860 49 !guest_handle_subrange_okay(a->extent_list, a->nr_done,
keir@17860 50 a->nr_extents-1) )
kfraser@12374 51 return;
kaf24@6486 52
kfraser@12374 53 if ( (a->extent_order != 0) &&
kaf24@8468 54 !multipage_allocation_permitted(current->domain) )
kfraser@12374 55 return;
kaf24@6486 56
kfraser@12374 57 for ( i = a->nr_done; i < a->nr_extents; i++ )
kaf24@6486 58 {
kaf24@6486 59 if ( hypercall_preempt_check() )
kaf24@6607 60 {
kfraser@12374 61 a->preempted = 1;
kfraser@12374 62 goto out;
kaf24@6607 63 }
kaf24@6486 64
keir@17986 65 page = alloc_domheap_pages(d, a->extent_order, a->memflags);
kfraser@12374 66 if ( unlikely(page == NULL) )
kaf24@6486 67 {
kaf24@12038 68 gdprintk(XENLOG_INFO, "Could not allocate order=%d extent: "
kfraser@10418 69 "id=%d memflags=%x (%ld of %d)\n",
kfraser@12374 70 a->extent_order, d->domain_id, a->memflags,
kfraser@12374 71 i, a->nr_extents);
kfraser@12374 72 goto out;
kaf24@6486 73 }
kaf24@6486 74
kaf24@6486 75 /* Inform the domain of the new page's machine address. */
kfraser@12374 76 if ( !guest_handle_is_null(a->extent_list) )
kaf24@8859 77 {
kaf24@8859 78 mfn = page_to_mfn(page);
kfraser@12374 79 if ( unlikely(__copy_to_guest_offset(a->extent_list, i, &mfn, 1)) )
kfraser@12374 80 goto out;
kaf24@8859 81 }
kaf24@6486 82 }
kaf24@6486 83
kfraser@12374 84 out:
kfraser@12374 85 a->nr_done = i;
kaf24@6486 86 }
sos22@8688 87
kfraser@12374 88 static void populate_physmap(struct memop_args *a)
kaf24@8673 89 {
kaf24@8726 90 struct page_info *page;
kaf24@10314 91 unsigned long i, j;
kfraser@12374 92 xen_pfn_t gpfn, mfn;
kfraser@12374 93 struct domain *d = a->domain;
kaf24@8673 94
keir@17860 95 if ( !guest_handle_subrange_okay(a->extent_list, a->nr_done,
keir@17860 96 a->nr_extents-1) )
kfraser@12374 97 return;
kaf24@8673 98
kfraser@12374 99 if ( (a->extent_order != 0) &&
kaf24@8673 100 !multipage_allocation_permitted(current->domain) )
kfraser@12374 101 return;
kaf24@8673 102
kfraser@12374 103 for ( i = a->nr_done; i < a->nr_extents; i++ )
kaf24@8673 104 {
kaf24@8673 105 if ( hypercall_preempt_check() )
kaf24@8673 106 {
kfraser@12374 107 a->preempted = 1;
sos22@8688 108 goto out;
kaf24@8673 109 }
kaf24@8673 110
kfraser@12374 111 if ( unlikely(__copy_from_guest_offset(&gpfn, a->extent_list, i, 1)) )
kaf24@8859 112 goto out;
kaf24@8859 113
keir@17986 114 page = alloc_domheap_pages(d, a->extent_order, a->memflags);
kfraser@12374 115 if ( unlikely(page == NULL) )
kaf24@8673 116 {
kaf24@12038 117 gdprintk(XENLOG_INFO, "Could not allocate order=%d extent: "
kfraser@12374 118 "id=%d memflags=%x (%ld of %d)\n",
kfraser@12374 119 a->extent_order, d->domain_id, a->memflags,
kfraser@12374 120 i, a->nr_extents);
sos22@8688 121 goto out;
kaf24@8673 122 }
kaf24@8673 123
kaf24@8726 124 mfn = page_to_mfn(page);
keir@17727 125 guest_physmap_add_page(d, gpfn, mfn, a->extent_order);
kaf24@8673 126
keir@17727 127 if ( !paging_mode_translate(d) )
kaf24@8694 128 {
kfraser@12374 129 for ( j = 0; j < (1 << a->extent_order); j++ )
kaf24@8736 130 set_gpfn_from_mfn(mfn + j, gpfn + j);
kaf24@8673 131
sos22@8688 132 /* Inform the domain of the new page's machine address. */
kfraser@12374 133 if ( unlikely(__copy_to_guest_offset(a->extent_list, i, &mfn, 1)) )
sos22@8688 134 goto out;
sos22@8688 135 }
kaf24@8673 136 }
kaf24@8673 137
sos22@8688 138 out:
kfraser@12374 139 a->nr_done = i;
kaf24@8673 140 }
cl349@9211 141
kfraser@12374 142 int guest_remove_page(struct domain *d, unsigned long gmfn)
cl349@9211 143 {
cl349@9211 144 struct page_info *page;
cl349@9211 145 unsigned long mfn;
cl349@9211 146
cl349@9211 147 mfn = gmfn_to_mfn(d, gmfn);
cl349@9211 148 if ( unlikely(!mfn_valid(mfn)) )
cl349@9211 149 {
kaf24@12038 150 gdprintk(XENLOG_INFO, "Domain %u page number %lx invalid\n",
tdeegan@11172 151 d->domain_id, gmfn);
cl349@9211 152 return 0;
cl349@9211 153 }
cl349@9211 154
cl349@9211 155 page = mfn_to_page(mfn);
cl349@9211 156 if ( unlikely(!get_page(page, d)) )
cl349@9211 157 {
kaf24@12038 158 gdprintk(XENLOG_INFO, "Bad page free for domain %u\n", d->domain_id);
cl349@9211 159 return 0;
cl349@9211 160 }
cl349@9211 161
cl349@9211 162 if ( test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
cl349@9211 163 put_page_and_type(page);
cl349@9211 164
cl349@9211 165 if ( test_and_clear_bit(_PGC_allocated, &page->count_info) )
cl349@9211 166 put_page(page);
cl349@9211 167
keir@17664 168 guest_physmap_remove_page(d, gmfn, mfn, 0);
cl349@9211 169
cl349@9211 170 put_page(page);
cl349@9211 171
cl349@9211 172 return 1;
cl349@9211 173 }
cl349@9211 174
kfraser@12374 175 static void decrease_reservation(struct memop_args *a)
kaf24@6486 176 {
kaf24@10314 177 unsigned long i, j;
kaf24@10314 178 xen_pfn_t gmfn;
kaf24@6486 179
keir@17860 180 if ( !guest_handle_subrange_okay(a->extent_list, a->nr_done,
keir@17860 181 a->nr_extents-1) )
kfraser@12374 182 return;
kaf24@6486 183
kfraser@12374 184 for ( i = a->nr_done; i < a->nr_extents; i++ )
kaf24@6486 185 {
kaf24@6486 186 if ( hypercall_preempt_check() )
kaf24@6607 187 {
kfraser@12374 188 a->preempted = 1;
kfraser@12374 189 goto out;
kaf24@6607 190 }
kaf24@6486 191
kfraser@12374 192 if ( unlikely(__copy_from_guest_offset(&gmfn, a->extent_list, i, 1)) )
kfraser@12374 193 goto out;
kaf24@6486 194
kfraser@12374 195 for ( j = 0; j < (1 << a->extent_order); j++ )
kfraser@12374 196 if ( !guest_remove_page(a->domain, gmfn + j) )
kfraser@12374 197 goto out;
kaf24@6486 198 }
kaf24@6486 199
kfraser@12374 200 out:
kfraser@12374 201 a->nr_done = i;
kaf24@6486 202 }
kaf24@6486 203
kfraser@12374 204 static long translate_gpfn_list(
kaf24@9873 205 XEN_GUEST_HANDLE(xen_translate_gpfn_list_t) uop, unsigned long *progress)
kaf24@8871 206 {
kaf24@8871 207 struct xen_translate_gpfn_list op;
kaf24@10314 208 unsigned long i;
kaf24@10314 209 xen_pfn_t gpfn;
kaf24@10314 210 xen_pfn_t mfn;
kaf24@8871 211 struct domain *d;
kfraser@15815 212 int rc;
kaf24@6486 213
kaf24@9068 214 if ( copy_from_guest(&op, uop, 1) )
kaf24@8871 215 return -EFAULT;
kaf24@8871 216
kaf24@8871 217 /* Is size too large for us to encode a continuation? */
ack@13295 218 if ( op.nr_gpfns > (ULONG_MAX >> MEMOP_EXTENT_SHIFT) )
kaf24@8871 219 return -EINVAL;
kaf24@8871 220
keir@17860 221 if ( !guest_handle_subrange_okay(op.gpfn_list, *progress, op.nr_gpfns-1) ||
keir@17860 222 !guest_handle_subrange_okay(op.mfn_list, *progress, op.nr_gpfns-1) )
kaf24@8871 223 return -EFAULT;
kaf24@8871 224
keir@18574 225 rc = rcu_lock_target_domain_by_id(op.domid, &d);
keir@18574 226 if ( rc )
keir@18574 227 return rc;
kaf24@8871 228
Tim@15635 229 if ( !paging_mode_translate(d) )
kaf24@8871 230 {
kfraser@14192 231 rcu_unlock_domain(d);
kaf24@8871 232 return -EINVAL;
kaf24@8871 233 }
kaf24@8871 234
kaf24@8871 235 for ( i = *progress; i < op.nr_gpfns; i++ )
kaf24@8871 236 {
kaf24@8871 237 if ( hypercall_preempt_check() )
kaf24@8871 238 {
kfraser@14192 239 rcu_unlock_domain(d);
kaf24@8871 240 *progress = i;
kaf24@8871 241 return -EAGAIN;
kaf24@8871 242 }
kaf24@8871 243
kaf24@9068 244 if ( unlikely(__copy_from_guest_offset(&gpfn, op.gpfn_list, i, 1)) )
kaf24@8871 245 {
kfraser@14192 246 rcu_unlock_domain(d);
kaf24@8871 247 return -EFAULT;
kaf24@8871 248 }
kaf24@8871 249
kaf24@8871 250 mfn = gmfn_to_mfn(d, gpfn);
kaf24@8871 251
kfraser@15815 252 rc = xsm_translate_gpfn_list(current->domain, mfn);
kfraser@15815 253 if ( rc )
kfraser@15815 254 {
kfraser@15815 255 rcu_unlock_domain(d);
kfraser@15815 256 return rc;
kfraser@15815 257 }
kfraser@15815 258
kaf24@9068 259 if ( unlikely(__copy_to_guest_offset(op.mfn_list, i, &mfn, 1)) )
kaf24@8871 260 {
kfraser@14192 261 rcu_unlock_domain(d);
kaf24@8871 262 return -EFAULT;
kaf24@8871 263 }
kaf24@8871 264 }
kaf24@8871 265
kfraser@14192 266 rcu_unlock_domain(d);
kaf24@8871 267 return 0;
kaf24@8871 268 }
kaf24@8871 269
kfraser@12374 270 static long memory_exchange(XEN_GUEST_HANDLE(xen_memory_exchange_t) arg)
kfraser@10418 271 {
kfraser@10418 272 struct xen_memory_exchange exch;
kfraser@10418 273 LIST_HEAD(in_chunk_list);
kfraser@10418 274 LIST_HEAD(out_chunk_list);
kfraser@10418 275 unsigned long in_chunk_order, out_chunk_order;
kaf24@10459 276 xen_pfn_t gpfn, gmfn, mfn;
kfraser@10418 277 unsigned long i, j, k;
keir@17988 278 unsigned int node, memflags = 0;
kfraser@10418 279 long rc = 0;
kfraser@10418 280 struct domain *d;
kfraser@10418 281 struct page_info *page;
kfraser@10418 282
kfraser@10418 283 if ( copy_from_guest(&exch, arg, 1) )
kfraser@10418 284 return -EFAULT;
kfraser@10418 285
kfraser@10418 286 /* Various sanity checks. */
kfraser@10418 287 if ( (exch.nr_exchanged > exch.in.nr_extents) ||
kfraser@10418 288 /* Input and output domain identifiers match? */
kfraser@10418 289 (exch.in.domid != exch.out.domid) ||
kfraser@10418 290 /* Sizes of input and output lists do not overflow a long? */
kfraser@10418 291 ((~0UL >> exch.in.extent_order) < exch.in.nr_extents) ||
kfraser@10418 292 ((~0UL >> exch.out.extent_order) < exch.out.nr_extents) ||
kfraser@10418 293 /* Sizes of input and output lists match? */
kfraser@10418 294 ((exch.in.nr_extents << exch.in.extent_order) !=
kfraser@10418 295 (exch.out.nr_extents << exch.out.extent_order)) )
kfraser@10418 296 {
kfraser@10418 297 rc = -EINVAL;
kfraser@10418 298 goto fail_early;
kfraser@10418 299 }
kfraser@10418 300
kfraser@10418 301 /* Only privileged guests can allocate multi-page contiguous extents. */
kfraser@10418 302 if ( ((exch.in.extent_order != 0) || (exch.out.extent_order != 0)) &&
kfraser@10418 303 !multipage_allocation_permitted(current->domain) )
kfraser@10418 304 {
kfraser@10418 305 rc = -EPERM;
kfraser@10418 306 goto fail_early;
kfraser@10418 307 }
kfraser@10418 308
kfraser@10418 309 if ( exch.in.extent_order <= exch.out.extent_order )
kfraser@10418 310 {
kfraser@10418 311 in_chunk_order = exch.out.extent_order - exch.in.extent_order;
kfraser@10418 312 out_chunk_order = 0;
kfraser@10418 313 }
kfraser@10418 314 else
kfraser@10418 315 {
kfraser@10418 316 in_chunk_order = 0;
kfraser@10418 317 out_chunk_order = exch.in.extent_order - exch.out.extent_order;
kfraser@10418 318 }
kfraser@10418 319
kfraser@10418 320 /*
kfraser@10418 321 * Only support exchange on calling domain right now. Otherwise there are
kfraser@14642 322 * tricky corner cases to consider (e.g., dying domain).
kfraser@10418 323 */
kfraser@10418 324 if ( unlikely(exch.in.domid != DOMID_SELF) )
kfraser@10418 325 {
kfraser@10418 326 rc = IS_PRIV(current->domain) ? -EINVAL : -EPERM;
kfraser@10418 327 goto fail_early;
kfraser@10418 328 }
kfraser@10418 329 d = current->domain;
kfraser@10418 330
keir@16548 331 memflags |= MEMF_bits(domain_clamp_alloc_bitsize(
keir@17986 332 d,
keir@17986 333 XENMEMF_get_address_bits(exch.out.mem_flags) ? :
keir@17986 334 (BITS_PER_LONG+PAGE_SHIFT)));
keir@17988 335 node = XENMEMF_get_node(exch.out.mem_flags);
keir@17988 336 if ( node == NUMA_NO_NODE )
keir@17988 337 node = domain_to_node(d);
keir@17988 338 memflags |= MEMF_node(node);
kfraser@11973 339
kfraser@12374 340 for ( i = (exch.nr_exchanged >> in_chunk_order);
kfraser@12374 341 i < (exch.in.nr_extents >> in_chunk_order);
kfraser@12374 342 i++ )
kfraser@10418 343 {
kfraser@10418 344 if ( hypercall_preempt_check() )
kfraser@10418 345 {
kfraser@12374 346 exch.nr_exchanged = i << in_chunk_order;
kfraser@10418 347 if ( copy_field_to_guest(arg, &exch, nr_exchanged) )
kfraser@10418 348 return -EFAULT;
kfraser@10418 349 return hypercall_create_continuation(
kfraser@10418 350 __HYPERVISOR_memory_op, "lh", XENMEM_exchange, arg);
kfraser@10418 351 }
kfraser@10418 352
kfraser@10418 353 /* Steal a chunk's worth of input pages from the domain. */
kfraser@10418 354 for ( j = 0; j < (1UL << in_chunk_order); j++ )
kfraser@10418 355 {
kfraser@10418 356 if ( unlikely(__copy_from_guest_offset(
kfraser@10418 357 &gmfn, exch.in.extent_start, (i<<in_chunk_order)+j, 1)) )
kfraser@10418 358 {
kfraser@10418 359 rc = -EFAULT;
kfraser@10418 360 goto fail;
kfraser@10418 361 }
kfraser@10418 362
kfraser@10418 363 for ( k = 0; k < (1UL << exch.in.extent_order); k++ )
kfraser@10418 364 {
kfraser@10418 365 mfn = gmfn_to_mfn(d, gmfn + k);
kfraser@10418 366 if ( unlikely(!mfn_valid(mfn)) )
kfraser@10418 367 {
kfraser@10418 368 rc = -EINVAL;
kfraser@10418 369 goto fail;
kfraser@10418 370 }
kfraser@10418 371
kfraser@10418 372 page = mfn_to_page(mfn);
kfraser@10418 373
kfraser@10418 374 if ( unlikely(steal_page(d, page, MEMF_no_refcount)) )
kfraser@10418 375 {
kfraser@10418 376 rc = -EINVAL;
kfraser@10418 377 goto fail;
kfraser@10418 378 }
kfraser@10418 379
kfraser@10418 380 list_add(&page->list, &in_chunk_list);
kfraser@10418 381 }
kfraser@10418 382 }
kfraser@10418 383
kfraser@10418 384 /* Allocate a chunk's worth of anonymous output pages. */
kfraser@10418 385 for ( j = 0; j < (1UL << out_chunk_order); j++ )
kfraser@10418 386 {
keir@17385 387 page = alloc_domheap_pages(NULL, exch.out.extent_order, memflags);
kfraser@10418 388 if ( unlikely(page == NULL) )
kfraser@10418 389 {
kfraser@10418 390 rc = -ENOMEM;
kfraser@10418 391 goto fail;
kfraser@10418 392 }
kfraser@10418 393
kfraser@10418 394 list_add(&page->list, &out_chunk_list);
kfraser@10418 395 }
kfraser@10418 396
kfraser@10418 397 /*
kfraser@10418 398 * Success! Beyond this point we cannot fail for this chunk.
kfraser@10418 399 */
kfraser@10418 400
kfraser@10418 401 /* Destroy final reference to each input page. */
kfraser@10418 402 while ( !list_empty(&in_chunk_list) )
kfraser@10418 403 {
kfraser@10418 404 page = list_entry(in_chunk_list.next, struct page_info, list);
kfraser@10418 405 list_del(&page->list);
kfraser@10418 406 if ( !test_and_clear_bit(_PGC_allocated, &page->count_info) )
kfraser@10418 407 BUG();
kfraser@10418 408 mfn = page_to_mfn(page);
keir@17664 409 guest_physmap_remove_page(d, mfn_to_gmfn(d, mfn), mfn, 0);
kfraser@10418 410 put_page(page);
kfraser@10418 411 }
kfraser@10418 412
kfraser@10418 413 /* Assign each output page to the domain. */
kfraser@10418 414 j = 0;
kfraser@10418 415 while ( !list_empty(&out_chunk_list) )
kfraser@10418 416 {
kfraser@10418 417 page = list_entry(out_chunk_list.next, struct page_info, list);
kfraser@10418 418 list_del(&page->list);
kfraser@10418 419 if ( assign_pages(d, page, exch.out.extent_order,
kfraser@10418 420 MEMF_no_refcount) )
kfraser@10418 421 BUG();
kfraser@10418 422
kfraser@10418 423 /* Note that we ignore errors accessing the output extent list. */
kfraser@10418 424 (void)__copy_from_guest_offset(
kfraser@10418 425 &gpfn, exch.out.extent_start, (i<<out_chunk_order)+j, 1);
kfraser@10418 426
kfraser@10418 427 mfn = page_to_mfn(page);
keir@17727 428 guest_physmap_add_page(d, gpfn, mfn, exch.out.extent_order);
keir@17727 429
keir@17727 430 if ( !paging_mode_translate(d) )
kfraser@10418 431 {
kfraser@10418 432 for ( k = 0; k < (1UL << exch.out.extent_order); k++ )
kfraser@10418 433 set_gpfn_from_mfn(mfn + k, gpfn + k);
kfraser@10418 434 (void)__copy_to_guest_offset(
kfraser@10418 435 exch.out.extent_start, (i<<out_chunk_order)+j, &mfn, 1);
kfraser@10418 436 }
kfraser@10418 437
kfraser@10418 438 j++;
kfraser@10418 439 }
kfraser@10418 440 BUG_ON(j != (1UL << out_chunk_order));
kfraser@10418 441 }
kfraser@10418 442
kfraser@12374 443 exch.nr_exchanged = exch.in.nr_extents;
kfraser@10418 444 if ( copy_field_to_guest(arg, &exch, nr_exchanged) )
kfraser@10418 445 rc = -EFAULT;
kfraser@10418 446 return rc;
kfraser@10418 447
kfraser@10418 448 /*
kfraser@10418 449 * Failed a chunk! Free any partial chunk work. Tell caller how many
kfraser@10418 450 * chunks succeeded.
kfraser@10418 451 */
kfraser@10418 452 fail:
kfraser@10418 453 /* Reassign any input pages we managed to steal. */
kfraser@10418 454 while ( !list_empty(&in_chunk_list) )
kfraser@10418 455 {
kfraser@10418 456 page = list_entry(in_chunk_list.next, struct page_info, list);
kfraser@10418 457 list_del(&page->list);
kfraser@10418 458 if ( assign_pages(d, page, 0, MEMF_no_refcount) )
kfraser@10418 459 BUG();
kfraser@10418 460 }
kfraser@10418 461
kfraser@10418 462 /* Free any output pages we managed to allocate. */
kfraser@10418 463 while ( !list_empty(&out_chunk_list) )
kfraser@10418 464 {
kfraser@10418 465 page = list_entry(out_chunk_list.next, struct page_info, list);
kfraser@10418 466 list_del(&page->list);
kfraser@10418 467 free_domheap_pages(page, exch.out.extent_order);
kfraser@10418 468 }
kfraser@10418 469
kfraser@12374 470 exch.nr_exchanged = i << in_chunk_order;
kfraser@10418 471
kfraser@10418 472 fail_early:
kfraser@10418 473 if ( copy_field_to_guest(arg, &exch, nr_exchanged) )
kfraser@10418 474 rc = -EFAULT;
kfraser@10418 475 return rc;
kfraser@10418 476 }
kfraser@10418 477
kaf24@9873 478 long do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE(void) arg)
kaf24@6486 479 {
kaf24@6486 480 struct domain *d;
kfraser@12374 481 int rc, op;
keir@17986 482 unsigned int address_bits;
kaf24@8871 483 unsigned long start_extent, progress;
kaf24@6486 484 struct xen_memory_reservation reservation;
kfraser@12374 485 struct memop_args args;
kaf24@7959 486 domid_t domid;
kaf24@6486 487
ack@13295 488 op = cmd & MEMOP_CMD_MASK;
kaf24@6486 489
kaf24@6486 490 switch ( op )
kaf24@6486 491 {
kaf24@6486 492 case XENMEM_increase_reservation:
kaf24@6486 493 case XENMEM_decrease_reservation:
kaf24@8673 494 case XENMEM_populate_physmap:
ack@13295 495 start_extent = cmd >> MEMOP_EXTENT_SHIFT;
kfraser@10418 496
kaf24@9068 497 if ( copy_from_guest(&reservation, arg, 1) )
kfraser@10418 498 return start_extent;
kaf24@6486 499
kaf24@8871 500 /* Is size too large for us to encode a continuation? */
ack@13295 501 if ( reservation.nr_extents > (ULONG_MAX >> MEMOP_EXTENT_SHIFT) )
kfraser@10418 502 return start_extent;
kaf24@8871 503
kaf24@6486 504 if ( unlikely(start_extent > reservation.nr_extents) )
kfraser@10418 505 return start_extent;
kaf24@9068 506
kfraser@12374 507 args.extent_list = reservation.extent_start;
kfraser@12374 508 args.nr_extents = reservation.nr_extents;
kfraser@12374 509 args.extent_order = reservation.extent_order;
kfraser@12374 510 args.nr_done = start_extent;
kfraser@12374 511 args.preempted = 0;
kfraser@12374 512 args.memflags = 0;
kaf24@6486 513
keir@17986 514 address_bits = XENMEMF_get_address_bits(reservation.mem_flags);
keir@17986 515 if ( (address_bits != 0) &&
keir@17986 516 (address_bits < (get_order_from_pages(max_page) + PAGE_SHIFT)) )
kaf24@6486 517 {
keir@17986 518 if ( address_bits <= PAGE_SHIFT )
kfraser@10418 519 return start_extent;
keir@17986 520 args.memflags = MEMF_bits(address_bits);
kaf24@6486 521 }
kaf24@6486 522
keir@17986 523 args.memflags |= MEMF_node(XENMEMF_get_node(reservation.mem_flags));
keir@17986 524
kaf24@6486 525 if ( likely(reservation.domid == DOMID_SELF) )
keir@17349 526 {
keir@17349 527 d = rcu_lock_current_domain();
keir@17349 528 }
keir@17349 529 else
keir@17349 530 {
keir@17349 531 if ( (d = rcu_lock_domain_by_id(reservation.domid)) == NULL )
keir@16856 532 return start_extent;
keir@17349 533 if ( !IS_PRIV_FOR(current->domain, d) )
keir@17349 534 {
keir@16856 535 rcu_unlock_domain(d);
keir@16856 536 return start_extent;
keir@16856 537 }
keir@16856 538 }
kfraser@12374 539 args.domain = d;
kaf24@6486 540
kfraser@15815 541 rc = xsm_memory_adjust_reservation(current->domain, d);
kfraser@15815 542 if ( rc )
kfraser@15815 543 {
keir@17349 544 rcu_unlock_domain(d);
kfraser@15815 545 return rc;
kfraser@15815 546 }
kfraser@15815 547
kaf24@8673 548 switch ( op )
kaf24@8673 549 {
kaf24@8673 550 case XENMEM_increase_reservation:
kfraser@12374 551 increase_reservation(&args);
kaf24@8673 552 break;
kaf24@8673 553 case XENMEM_decrease_reservation:
kfraser@12374 554 decrease_reservation(&args);
kaf24@8673 555 break;
kfraser@12374 556 default: /* XENMEM_populate_physmap */
kfraser@12374 557 populate_physmap(&args);
kaf24@8673 558 break;
kaf24@8673 559 }
kaf24@6486 560
keir@17349 561 rcu_unlock_domain(d);
kaf24@6486 562
kfraser@12374 563 rc = args.nr_done;
kaf24@6486 564
kfraser@12374 565 if ( args.preempted )
kaf24@9068 566 return hypercall_create_continuation(
kaf24@9068 567 __HYPERVISOR_memory_op, "lh",
ack@13295 568 op | (rc << MEMOP_EXTENT_SHIFT), arg);
kaf24@6607 569
kaf24@6486 570 break;
kaf24@6486 571
kfraser@10418 572 case XENMEM_exchange:
kfraser@10418 573 rc = memory_exchange(guest_handle_cast(arg, xen_memory_exchange_t));
kfraser@10418 574 break;
kfraser@10418 575
kaf24@6486 576 case XENMEM_maximum_ram_page:
kaf24@7959 577 rc = max_page;
kaf24@7959 578 break;
kaf24@7959 579
kaf24@7959 580 case XENMEM_current_reservation:
kaf24@7959 581 case XENMEM_maximum_reservation:
kfraser@14471 582 case XENMEM_maximum_gpfn:
kaf24@9068 583 if ( copy_from_guest(&domid, arg, 1) )
kaf24@6486 584 return -EFAULT;
kaf24@7959 585
keir@18574 586 rc = rcu_lock_target_domain_by_id(domid, &d);
keir@18574 587 if ( rc )
keir@18574 588 return rc;
kaf24@7959 589
kfraser@15815 590 rc = xsm_memory_stat_reservation(current->domain, d);
kfraser@15815 591 if ( rc )
kfraser@15815 592 {
keir@17349 593 rcu_unlock_domain(d);
kfraser@15815 594 return rc;
kfraser@15815 595 }
kfraser@15815 596
kfraser@14471 597 switch ( op )
kfraser@14471 598 {
kfraser@14471 599 case XENMEM_current_reservation:
kfraser@14471 600 rc = d->tot_pages;
kfraser@14471 601 break;
kfraser@14471 602 case XENMEM_maximum_reservation:
kfraser@14471 603 rc = d->max_pages;
kfraser@14471 604 break;
kfraser@14471 605 default:
kfraser@14471 606 ASSERT(op == XENMEM_maximum_gpfn);
kfraser@14471 607 rc = domain_get_maximum_gpfn(d);
kfraser@14471 608 break;
kfraser@14471 609 }
kaf24@7959 610
keir@17349 611 rcu_unlock_domain(d);
kaf24@7959 612
kaf24@6486 613 break;
kaf24@6486 614
kaf24@8871 615 case XENMEM_translate_gpfn_list:
ack@13295 616 progress = cmd >> MEMOP_EXTENT_SHIFT;
kaf24@9068 617 rc = translate_gpfn_list(
kaf24@9068 618 guest_handle_cast(arg, xen_translate_gpfn_list_t),
kaf24@9068 619 &progress);
kaf24@8871 620 if ( rc == -EAGAIN )
kaf24@9068 621 return hypercall_create_continuation(
kaf24@9068 622 __HYPERVISOR_memory_op, "lh",
ack@13295 623 op | (progress << MEMOP_EXTENT_SHIFT), arg);
kaf24@8871 624 break;
kaf24@8871 625
kaf24@6486 626 default:
kaf24@8059 627 rc = arch_memory_op(op, arg);
kaf24@6486 628 break;
kaf24@6486 629 }
kaf24@6486 630
kaf24@6486 631 return rc;
kaf24@6486 632 }
kaf24@6486 633
kaf24@6486 634 /*
kaf24@6486 635 * Local variables:
kaf24@6486 636 * mode: C
kaf24@6486 637 * c-set-style: "BSD"
kaf24@6486 638 * c-basic-offset: 4
kaf24@6486 639 * tab-width: 4
kaf24@6486 640 * indent-tabs-mode: nil
kaf24@6486 641 * End:
kaf24@6486 642 */