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a42089dd JF |
1 | /****************************************************************************** |
2 | * grant_table.h | |
3 | * | |
4 | * Interface for granting foreign access to page frames, and receiving | |
5 | * page-ownership transfers. | |
6 | * | |
ad9a8612 JF |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to | |
9 | * deal in the Software without restriction, including without limitation the | |
10 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
11 | * sell copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
20 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
23 | * DEALINGS IN THE SOFTWARE. | |
24 | * | |
a42089dd JF |
25 | * Copyright (c) 2004, K A Fraser |
26 | */ | |
27 | ||
28 | #ifndef __XEN_PUBLIC_GRANT_TABLE_H__ | |
29 | #define __XEN_PUBLIC_GRANT_TABLE_H__ | |
30 | ||
183d03cc | 31 | #include <xen/interface/xen.h> |
a42089dd JF |
32 | |
33 | /*********************************** | |
34 | * GRANT TABLE REPRESENTATION | |
35 | */ | |
36 | ||
37 | /* Some rough guidelines on accessing and updating grant-table entries | |
38 | * in a concurrency-safe manner. For more information, Linux contains a | |
ad9a8612 | 39 | * reference implementation for guest OSes (arch/xen/kernel/grant_table.c). |
a42089dd JF |
40 | * |
41 | * NB. WMB is a no-op on current-generation x86 processors. However, a | |
42 | * compiler barrier will still be required. | |
43 | * | |
44 | * Introducing a valid entry into the grant table: | |
45 | * 1. Write ent->domid. | |
46 | * 2. Write ent->frame: | |
47 | * GTF_permit_access: Frame to which access is permitted. | |
48 | * GTF_accept_transfer: Pseudo-phys frame slot being filled by new | |
49 | * frame, or zero if none. | |
50 | * 3. Write memory barrier (WMB). | |
51 | * 4. Write ent->flags, inc. valid type. | |
52 | * | |
53 | * Invalidating an unused GTF_permit_access entry: | |
54 | * 1. flags = ent->flags. | |
55 | * 2. Observe that !(flags & (GTF_reading|GTF_writing)). | |
56 | * 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0). | |
57 | * NB. No need for WMB as reuse of entry is control-dependent on success of | |
58 | * step 3, and all architectures guarantee ordering of ctrl-dep writes. | |
59 | * | |
60 | * Invalidating an in-use GTF_permit_access entry: | |
61 | * This cannot be done directly. Request assistance from the domain controller | |
62 | * which can set a timeout on the use of a grant entry and take necessary | |
63 | * action. (NB. This is not yet implemented!). | |
64 | * | |
65 | * Invalidating an unused GTF_accept_transfer entry: | |
66 | * 1. flags = ent->flags. | |
67 | * 2. Observe that !(flags & GTF_transfer_committed). [*] | |
68 | * 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0). | |
69 | * NB. No need for WMB as reuse of entry is control-dependent on success of | |
70 | * step 3, and all architectures guarantee ordering of ctrl-dep writes. | |
71 | * [*] If GTF_transfer_committed is set then the grant entry is 'committed'. | |
72 | * The guest must /not/ modify the grant entry until the address of the | |
73 | * transferred frame is written. It is safe for the guest to spin waiting | |
74 | * for this to occur (detect by observing GTF_transfer_completed in | |
75 | * ent->flags). | |
76 | * | |
77 | * Invalidating a committed GTF_accept_transfer entry: | |
78 | * 1. Wait for (ent->flags & GTF_transfer_completed). | |
79 | * | |
80 | * Changing a GTF_permit_access from writable to read-only: | |
81 | * Use SMP-safe CMPXCHG to set GTF_readonly, while checking !GTF_writing. | |
82 | * | |
83 | * Changing a GTF_permit_access from read-only to writable: | |
84 | * Use SMP-safe bit-setting instruction. | |
85 | */ | |
86 | ||
0f9f5a95 AL |
87 | /* |
88 | * Reference to a grant entry in a specified domain's grant table. | |
89 | */ | |
90 | typedef uint32_t grant_ref_t; | |
91 | ||
a42089dd JF |
92 | /* |
93 | * A grant table comprises a packed array of grant entries in one or more | |
94 | * page frames shared between Xen and a guest. | |
95 | * [XEN]: This field is written by Xen and read by the sharing guest. | |
96 | * [GST]: This field is written by the guest and read by Xen. | |
97 | */ | |
0f9f5a95 AL |
98 | |
99 | /* | |
100 | * Version 1 of the grant table entry structure is maintained purely | |
101 | * for backwards compatibility. New guests should use version 2. | |
102 | */ | |
103 | struct grant_entry_v1 { | |
a42089dd JF |
104 | /* GTF_xxx: various type and flag information. [XEN,GST] */ |
105 | uint16_t flags; | |
106 | /* The domain being granted foreign privileges. [GST] */ | |
107 | domid_t domid; | |
108 | /* | |
109 | * GTF_permit_access: Frame that @domid is allowed to map and access. [GST] | |
110 | * GTF_accept_transfer: Frame whose ownership transferred by @domid. [XEN] | |
111 | */ | |
112 | uint32_t frame; | |
113 | }; | |
114 | ||
115 | /* | |
116 | * Type of grant entry. | |
117 | * GTF_invalid: This grant entry grants no privileges. | |
118 | * GTF_permit_access: Allow @domid to map/access @frame. | |
119 | * GTF_accept_transfer: Allow @domid to transfer ownership of one page frame | |
120 | * to this guest. Xen writes the page number to @frame. | |
0f9f5a95 AL |
121 | * GTF_transitive: Allow @domid to transitively access a subrange of |
122 | * @trans_grant in @trans_domid. No mappings are allowed. | |
a42089dd JF |
123 | */ |
124 | #define GTF_invalid (0U<<0) | |
125 | #define GTF_permit_access (1U<<0) | |
126 | #define GTF_accept_transfer (2U<<0) | |
0f9f5a95 | 127 | #define GTF_transitive (3U<<0) |
a42089dd JF |
128 | #define GTF_type_mask (3U<<0) |
129 | ||
130 | /* | |
131 | * Subflags for GTF_permit_access. | |
132 | * GTF_readonly: Restrict @domid to read-only mappings and accesses. [GST] | |
133 | * GTF_reading: Grant entry is currently mapped for reading by @domid. [XEN] | |
134 | * GTF_writing: Grant entry is currently mapped for writing by @domid. [XEN] | |
0f9f5a95 AL |
135 | * GTF_sub_page: Grant access to only a subrange of the page. @domid |
136 | * will only be allowed to copy from the grant, and not | |
137 | * map it. [GST] | |
a42089dd JF |
138 | */ |
139 | #define _GTF_readonly (2) | |
140 | #define GTF_readonly (1U<<_GTF_readonly) | |
141 | #define _GTF_reading (3) | |
142 | #define GTF_reading (1U<<_GTF_reading) | |
143 | #define _GTF_writing (4) | |
144 | #define GTF_writing (1U<<_GTF_writing) | |
0f9f5a95 AL |
145 | #define _GTF_sub_page (8) |
146 | #define GTF_sub_page (1U<<_GTF_sub_page) | |
a42089dd JF |
147 | |
148 | /* | |
149 | * Subflags for GTF_accept_transfer: | |
150 | * GTF_transfer_committed: Xen sets this flag to indicate that it is committed | |
151 | * to transferring ownership of a page frame. When a guest sees this flag | |
152 | * it must /not/ modify the grant entry until GTF_transfer_completed is | |
153 | * set by Xen. | |
154 | * GTF_transfer_completed: It is safe for the guest to spin-wait on this flag | |
155 | * after reading GTF_transfer_committed. Xen will always write the frame | |
156 | * address, followed by ORing this flag, in a timely manner. | |
157 | */ | |
158 | #define _GTF_transfer_committed (2) | |
159 | #define GTF_transfer_committed (1U<<_GTF_transfer_committed) | |
160 | #define _GTF_transfer_completed (3) | |
161 | #define GTF_transfer_completed (1U<<_GTF_transfer_completed) | |
162 | ||
0f9f5a95 AL |
163 | /* |
164 | * Version 2 grant table entries. These fulfil the same role as | |
165 | * version 1 entries, but can represent more complicated operations. | |
166 | * Any given domain will have either a version 1 or a version 2 table, | |
167 | * and every entry in the table will be the same version. | |
168 | * | |
169 | * The interface by which domains use grant references does not depend | |
170 | * on the grant table version in use by the other domain. | |
171 | */ | |
a42089dd | 172 | |
0f9f5a95 AL |
173 | /* |
174 | * Version 1 and version 2 grant entries share a common prefix. The | |
175 | * fields of the prefix are documented as part of struct | |
176 | * grant_entry_v1. | |
a42089dd | 177 | */ |
0f9f5a95 AL |
178 | struct grant_entry_header { |
179 | uint16_t flags; | |
180 | domid_t domid; | |
181 | }; | |
a42089dd JF |
182 | |
183 | /* | |
0f9f5a95 AL |
184 | * Version 2 of the grant entry structure, here is an union because three |
185 | * different types are suppotted: full_page, sub_page and transitive. | |
186 | */ | |
187 | union grant_entry_v2 { | |
188 | struct grant_entry_header hdr; | |
189 | ||
190 | /* | |
191 | * This member is used for V1-style full page grants, where either: | |
192 | * | |
193 | * -- hdr.type is GTF_accept_transfer, or | |
194 | * -- hdr.type is GTF_permit_access and GTF_sub_page is not set. | |
195 | * | |
196 | * In that case, the frame field has the same semantics as the | |
197 | * field of the same name in the V1 entry structure. | |
198 | */ | |
199 | struct { | |
200 | struct grant_entry_header hdr; | |
201 | uint32_t pad0; | |
202 | uint64_t frame; | |
203 | } full_page; | |
204 | ||
205 | /* | |
206 | * If the grant type is GTF_grant_access and GTF_sub_page is set, | |
207 | * @domid is allowed to access bytes [@page_off,@page_off+@length) | |
208 | * in frame @frame. | |
209 | */ | |
210 | struct { | |
211 | struct grant_entry_header hdr; | |
212 | uint16_t page_off; | |
213 | uint16_t length; | |
214 | uint64_t frame; | |
215 | } sub_page; | |
216 | ||
217 | /* | |
218 | * If the grant is GTF_transitive, @domid is allowed to use the | |
219 | * grant @gref in domain @trans_domid, as if it was the local | |
220 | * domain. Obviously, the transitive access must be compatible | |
221 | * with the original grant. | |
222 | */ | |
223 | struct { | |
224 | struct grant_entry_header hdr; | |
225 | domid_t trans_domid; | |
226 | uint16_t pad0; | |
227 | grant_ref_t gref; | |
228 | } transitive; | |
229 | ||
230 | uint32_t __spacer[4]; /* Pad to a power of two */ | |
231 | }; | |
232 | ||
233 | typedef uint16_t grant_status_t; | |
234 | ||
235 | /*********************************** | |
236 | * GRANT TABLE QUERIES AND USES | |
a42089dd | 237 | */ |
a42089dd JF |
238 | |
239 | /* | |
240 | * Handle to track a mapping created via a grant reference. | |
241 | */ | |
242 | typedef uint32_t grant_handle_t; | |
243 | ||
244 | /* | |
245 | * GNTTABOP_map_grant_ref: Map the grant entry (<dom>,<ref>) for access | |
246 | * by devices and/or host CPUs. If successful, <handle> is a tracking number | |
247 | * that must be presented later to destroy the mapping(s). On error, <handle> | |
248 | * is a negative status code. | |
249 | * NOTES: | |
ad9a8612 | 250 | * 1. If GNTMAP_device_map is specified then <dev_bus_addr> is the address |
a42089dd | 251 | * via which I/O devices may access the granted frame. |
ad9a8612 | 252 | * 2. If GNTMAP_host_map is specified then a mapping will be added at |
a42089dd JF |
253 | * either a host virtual address in the current address space, or at |
254 | * a PTE at the specified machine address. The type of mapping to | |
255 | * perform is selected through the GNTMAP_contains_pte flag, and the | |
256 | * address is specified in <host_addr>. | |
257 | * 3. Mappings should only be destroyed via GNTTABOP_unmap_grant_ref. If a | |
258 | * host mapping is destroyed by other means then it is *NOT* guaranteed | |
259 | * to be accounted to the correct grant reference! | |
260 | */ | |
261 | #define GNTTABOP_map_grant_ref 0 | |
262 | struct gnttab_map_grant_ref { | |
263 | /* IN parameters. */ | |
264 | uint64_t host_addr; | |
265 | uint32_t flags; /* GNTMAP_* */ | |
266 | grant_ref_t ref; | |
267 | domid_t dom; | |
268 | /* OUT parameters. */ | |
269 | int16_t status; /* GNTST_* */ | |
270 | grant_handle_t handle; | |
271 | uint64_t dev_bus_addr; | |
272 | }; | |
87e27cf6 | 273 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_map_grant_ref); |
a42089dd JF |
274 | |
275 | /* | |
276 | * GNTTABOP_unmap_grant_ref: Destroy one or more grant-reference mappings | |
277 | * tracked by <handle>. If <host_addr> or <dev_bus_addr> is zero, that | |
278 | * field is ignored. If non-zero, they must refer to a device/host mapping | |
279 | * that is tracked by <handle> | |
280 | * NOTES: | |
281 | * 1. The call may fail in an undefined manner if either mapping is not | |
282 | * tracked by <handle>. | |
283 | * 3. After executing a batch of unmaps, it is guaranteed that no stale | |
284 | * mappings will remain in the device or host TLBs. | |
285 | */ | |
286 | #define GNTTABOP_unmap_grant_ref 1 | |
287 | struct gnttab_unmap_grant_ref { | |
288 | /* IN parameters. */ | |
289 | uint64_t host_addr; | |
290 | uint64_t dev_bus_addr; | |
291 | grant_handle_t handle; | |
292 | /* OUT parameters. */ | |
293 | int16_t status; /* GNTST_* */ | |
294 | }; | |
87e27cf6 | 295 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_grant_ref); |
a42089dd JF |
296 | |
297 | /* | |
298 | * GNTTABOP_setup_table: Set up a grant table for <dom> comprising at least | |
299 | * <nr_frames> pages. The frame addresses are written to the <frame_list>. | |
300 | * Only <nr_frames> addresses are written, even if the table is larger. | |
301 | * NOTES: | |
302 | * 1. <dom> may be specified as DOMID_SELF. | |
303 | * 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. | |
304 | * 3. Xen may not support more than a single grant-table page per domain. | |
305 | */ | |
306 | #define GNTTABOP_setup_table 2 | |
307 | struct gnttab_setup_table { | |
308 | /* IN parameters. */ | |
309 | domid_t dom; | |
310 | uint32_t nr_frames; | |
311 | /* OUT parameters. */ | |
312 | int16_t status; /* GNTST_* */ | |
ef32f892 | 313 | GUEST_HANDLE(xen_pfn_t) frame_list; |
a42089dd | 314 | }; |
87e27cf6 | 315 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_setup_table); |
a42089dd JF |
316 | |
317 | /* | |
318 | * GNTTABOP_dump_table: Dump the contents of the grant table to the | |
319 | * xen console. Debugging use only. | |
320 | */ | |
321 | #define GNTTABOP_dump_table 3 | |
322 | struct gnttab_dump_table { | |
323 | /* IN parameters. */ | |
324 | domid_t dom; | |
325 | /* OUT parameters. */ | |
326 | int16_t status; /* GNTST_* */ | |
327 | }; | |
87e27cf6 | 328 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_dump_table); |
a42089dd JF |
329 | |
330 | /* | |
331 | * GNTTABOP_transfer_grant_ref: Transfer <frame> to a foreign domain. The | |
332 | * foreign domain has previously registered its interest in the transfer via | |
333 | * <domid, ref>. | |
334 | * | |
335 | * Note that, even if the transfer fails, the specified page no longer belongs | |
336 | * to the calling domain *unless* the error is GNTST_bad_page. | |
337 | */ | |
338 | #define GNTTABOP_transfer 4 | |
339 | struct gnttab_transfer { | |
340 | /* IN parameters. */ | |
bd3f79b7 | 341 | xen_pfn_t mfn; |
a42089dd JF |
342 | domid_t domid; |
343 | grant_ref_t ref; | |
344 | /* OUT parameters. */ | |
345 | int16_t status; | |
346 | }; | |
87e27cf6 | 347 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_transfer); |
ad9a8612 JF |
348 | |
349 | /* | |
350 | * GNTTABOP_copy: Hypervisor based copy | |
351 | * source and destinations can be eithers MFNs or, for foreign domains, | |
352 | * grant references. the foreign domain has to grant read/write access | |
353 | * in its grant table. | |
354 | * | |
355 | * The flags specify what type source and destinations are (either MFN | |
356 | * or grant reference). | |
357 | * | |
358 | * Note that this can also be used to copy data between two domains | |
359 | * via a third party if the source and destination domains had previously | |
360 | * grant appropriate access to their pages to the third party. | |
361 | * | |
362 | * source_offset specifies an offset in the source frame, dest_offset | |
363 | * the offset in the target frame and len specifies the number of | |
364 | * bytes to be copied. | |
365 | */ | |
366 | ||
367 | #define _GNTCOPY_source_gref (0) | |
368 | #define GNTCOPY_source_gref (1<<_GNTCOPY_source_gref) | |
369 | #define _GNTCOPY_dest_gref (1) | |
370 | #define GNTCOPY_dest_gref (1<<_GNTCOPY_dest_gref) | |
371 | ||
372 | #define GNTTABOP_copy 5 | |
373 | struct gnttab_copy { | |
374 | /* IN parameters. */ | |
375 | struct { | |
376 | union { | |
377 | grant_ref_t ref; | |
bd3f79b7 | 378 | xen_pfn_t gmfn; |
ad9a8612 JF |
379 | } u; |
380 | domid_t domid; | |
381 | uint16_t offset; | |
382 | } source, dest; | |
383 | uint16_t len; | |
384 | uint16_t flags; /* GNTCOPY_* */ | |
385 | /* OUT parameters. */ | |
386 | int16_t status; | |
387 | }; | |
87e27cf6 | 388 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_copy); |
ad9a8612 JF |
389 | |
390 | /* | |
391 | * GNTTABOP_query_size: Query the current and maximum sizes of the shared | |
392 | * grant table. | |
393 | * NOTES: | |
394 | * 1. <dom> may be specified as DOMID_SELF. | |
395 | * 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. | |
396 | */ | |
397 | #define GNTTABOP_query_size 6 | |
398 | struct gnttab_query_size { | |
399 | /* IN parameters. */ | |
400 | domid_t dom; | |
401 | /* OUT parameters. */ | |
402 | uint32_t nr_frames; | |
403 | uint32_t max_nr_frames; | |
404 | int16_t status; /* GNTST_* */ | |
405 | }; | |
87e27cf6 | 406 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_query_size); |
a42089dd | 407 | |
0f9f5a95 AL |
408 | /* |
409 | * GNTTABOP_unmap_and_replace: Destroy one or more grant-reference mappings | |
410 | * tracked by <handle> but atomically replace the page table entry with one | |
411 | * pointing to the machine address under <new_addr>. <new_addr> will be | |
412 | * redirected to the null entry. | |
413 | * NOTES: | |
414 | * 1. The call may fail in an undefined manner if either mapping is not | |
415 | * tracked by <handle>. | |
416 | * 2. After executing a batch of unmaps, it is guaranteed that no stale | |
417 | * mappings will remain in the device or host TLBs. | |
418 | */ | |
419 | #define GNTTABOP_unmap_and_replace 7 | |
420 | struct gnttab_unmap_and_replace { | |
421 | /* IN parameters. */ | |
422 | uint64_t host_addr; | |
423 | uint64_t new_addr; | |
424 | grant_handle_t handle; | |
425 | /* OUT parameters. */ | |
426 | int16_t status; /* GNTST_* */ | |
427 | }; | |
428 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_and_replace); | |
429 | ||
430 | /* | |
431 | * GNTTABOP_set_version: Request a particular version of the grant | |
432 | * table shared table structure. This operation can only be performed | |
433 | * once in any given domain. It must be performed before any grants | |
434 | * are activated; otherwise, the domain will be stuck with version 1. | |
435 | * The only defined versions are 1 and 2. | |
436 | */ | |
437 | #define GNTTABOP_set_version 8 | |
438 | struct gnttab_set_version { | |
439 | /* IN parameters */ | |
440 | uint32_t version; | |
441 | }; | |
442 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version); | |
443 | ||
444 | /* | |
445 | * GNTTABOP_get_status_frames: Get the list of frames used to store grant | |
446 | * status for <dom>. In grant format version 2, the status is separated | |
447 | * from the other shared grant fields to allow more efficient synchronization | |
448 | * using barriers instead of atomic cmpexch operations. | |
449 | * <nr_frames> specify the size of vector <frame_list>. | |
450 | * The frame addresses are returned in the <frame_list>. | |
451 | * Only <nr_frames> addresses are returned, even if the table is larger. | |
452 | * NOTES: | |
453 | * 1. <dom> may be specified as DOMID_SELF. | |
454 | * 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. | |
455 | */ | |
456 | #define GNTTABOP_get_status_frames 9 | |
457 | struct gnttab_get_status_frames { | |
458 | /* IN parameters. */ | |
459 | uint32_t nr_frames; | |
460 | domid_t dom; | |
461 | /* OUT parameters. */ | |
462 | int16_t status; /* GNTST_* */ | |
463 | GUEST_HANDLE(uint64_t) frame_list; | |
464 | }; | |
465 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_status_frames); | |
466 | ||
467 | /* | |
468 | * GNTTABOP_get_version: Get the grant table version which is in | |
469 | * effect for domain <dom>. | |
470 | */ | |
471 | #define GNTTABOP_get_version 10 | |
472 | struct gnttab_get_version { | |
473 | /* IN parameters */ | |
474 | domid_t dom; | |
475 | uint16_t pad; | |
476 | /* OUT parameters */ | |
477 | uint32_t version; | |
478 | }; | |
479 | DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version); | |
480 | ||
a42089dd JF |
481 | /* |
482 | * Bitfield values for update_pin_status.flags. | |
483 | */ | |
484 | /* Map the grant entry for access by I/O devices. */ | |
485 | #define _GNTMAP_device_map (0) | |
486 | #define GNTMAP_device_map (1<<_GNTMAP_device_map) | |
487 | /* Map the grant entry for access by host CPUs. */ | |
488 | #define _GNTMAP_host_map (1) | |
489 | #define GNTMAP_host_map (1<<_GNTMAP_host_map) | |
490 | /* Accesses to the granted frame will be restricted to read-only access. */ | |
491 | #define _GNTMAP_readonly (2) | |
492 | #define GNTMAP_readonly (1<<_GNTMAP_readonly) | |
493 | /* | |
494 | * GNTMAP_host_map subflag: | |
495 | * 0 => The host mapping is usable only by the guest OS. | |
496 | * 1 => The host mapping is usable by guest OS + current application. | |
497 | */ | |
498 | #define _GNTMAP_application_map (3) | |
499 | #define GNTMAP_application_map (1<<_GNTMAP_application_map) | |
500 | ||
501 | /* | |
502 | * GNTMAP_contains_pte subflag: | |
503 | * 0 => This map request contains a host virtual address. | |
504 | * 1 => This map request contains the machine addess of the PTE to update. | |
505 | */ | |
506 | #define _GNTMAP_contains_pte (4) | |
507 | #define GNTMAP_contains_pte (1<<_GNTMAP_contains_pte) | |
508 | ||
509 | /* | |
510 | * Values for error status returns. All errors are -ve. | |
511 | */ | |
512 | #define GNTST_okay (0) /* Normal return. */ | |
513 | #define GNTST_general_error (-1) /* General undefined error. */ | |
514 | #define GNTST_bad_domain (-2) /* Unrecognsed domain id. */ | |
515 | #define GNTST_bad_gntref (-3) /* Unrecognised or inappropriate gntref. */ | |
516 | #define GNTST_bad_handle (-4) /* Unrecognised or inappropriate handle. */ | |
517 | #define GNTST_bad_virt_addr (-5) /* Inappropriate virtual address to map. */ | |
518 | #define GNTST_bad_dev_addr (-6) /* Inappropriate device address to unmap.*/ | |
519 | #define GNTST_no_device_space (-7) /* Out of space in I/O MMU. */ | |
520 | #define GNTST_permission_denied (-8) /* Not enough privilege for operation. */ | |
521 | #define GNTST_bad_page (-9) /* Specified page was invalid for op. */ | |
e58f5b55 IC |
522 | #define GNTST_bad_copy_arg (-10) /* copy arguments cross page boundary. */ |
523 | #define GNTST_address_too_big (-11) /* transfer page address too large. */ | |
524 | #define GNTST_eagain (-12) /* Operation not done; try again. */ | |
a42089dd JF |
525 | |
526 | #define GNTTABOP_error_msgs { \ | |
527 | "okay", \ | |
528 | "undefined error", \ | |
529 | "unrecognised domain id", \ | |
530 | "invalid grant reference", \ | |
531 | "invalid mapping handle", \ | |
532 | "invalid virtual address", \ | |
533 | "invalid device address", \ | |
534 | "no spare translation slot in the I/O MMU", \ | |
535 | "permission denied", \ | |
ad9a8612 | 536 | "bad page", \ |
e58f5b55 IC |
537 | "copy arguments cross page boundary", \ |
538 | "page address size too large", \ | |
539 | "operation not done; try again" \ | |
a42089dd JF |
540 | } |
541 | ||
542 | #endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */ |