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[thirdparty/qemu.git] / xen-mapcache.c
CommitLineData
432d268c
JN
1/*
2 * Copyright (C) 2011 Citrix Ltd.
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2. See
5 * the COPYING file in the top-level directory.
6 *
6b620ca3
PB
7 * Contributions after 2012-01-13 are licensed under the terms of the
8 * GNU GPL, version 2 or (at your option) any later version.
432d268c
JN
9 */
10
21cbfe5f 11#include "qemu/osdep.h"
432d268c
JN
12
13#include <sys/resource.h>
14
0d09e41a 15#include "hw/xen/xen_backend.h"
9c17d615 16#include "sysemu/blockdev.h"
1de7afc9 17#include "qemu/bitmap.h"
432d268c
JN
18
19#include <xen/hvm/params.h>
432d268c 20
9c17d615 21#include "sysemu/xen-mapcache.h"
432d268c
JN
22#include "trace.h"
23
24
25//#define MAPCACHE_DEBUG
26
27#ifdef MAPCACHE_DEBUG
28# define DPRINTF(fmt, ...) do { \
29 fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
30} while (0)
31#else
32# define DPRINTF(fmt, ...) do { } while (0)
33#endif
34
643f5932 35#if HOST_LONG_BITS == 32
432d268c 36# define MCACHE_BUCKET_SHIFT 16
ea6c5f8f 37# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
643f5932 38#else
432d268c 39# define MCACHE_BUCKET_SHIFT 20
ea6c5f8f 40# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
432d268c
JN
41#endif
42#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
43
56c119e5
AP
44/* This is the size of the virtual address space reserve to QEMU that will not
45 * be use by MapCache.
46 * From empirical tests I observed that qemu use 75MB more than the
47 * max_mcache_size.
48 */
49#define NON_MCACHE_MEMORY_SIZE (80 * 1024 * 1024)
50
432d268c 51typedef struct MapCacheEntry {
a8170e5e 52 hwaddr paddr_index;
432d268c 53 uint8_t *vaddr_base;
c13390cd 54 unsigned long *valid_mapping;
432d268c 55 uint8_t lock;
a8170e5e 56 hwaddr size;
432d268c
JN
57 struct MapCacheEntry *next;
58} MapCacheEntry;
59
60typedef struct MapCacheRev {
61 uint8_t *vaddr_req;
a8170e5e
AK
62 hwaddr paddr_index;
63 hwaddr size;
432d268c
JN
64 QTAILQ_ENTRY(MapCacheRev) next;
65} MapCacheRev;
66
67typedef struct MapCache {
68 MapCacheEntry *entry;
69 unsigned long nr_buckets;
70 QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries;
71
72 /* For most cases (>99.9%), the page address is the same. */
e2deee3e 73 MapCacheEntry *last_entry;
432d268c
JN
74 unsigned long max_mcache_size;
75 unsigned int mcache_bucket_shift;
cd1ba7de
AP
76
77 phys_offset_to_gaddr_t phys_offset_to_gaddr;
86a6a9bf 78 QemuMutex lock;
cd1ba7de 79 void *opaque;
432d268c
JN
80} MapCache;
81
82static MapCache *mapcache;
83
86a6a9bf
PB
84static inline void mapcache_lock(void)
85{
86 qemu_mutex_lock(&mapcache->lock);
87}
88
89static inline void mapcache_unlock(void)
90{
91 qemu_mutex_unlock(&mapcache->lock);
92}
93
c13390cd
SS
94static inline int test_bits(int nr, int size, const unsigned long *addr)
95{
96 unsigned long res = find_next_zero_bit(addr, size + nr, nr);
97 if (res >= nr + size)
98 return 1;
99 else
100 return 0;
101}
102
cd1ba7de 103void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
432d268c
JN
104{
105 unsigned long size;
106 struct rlimit rlimit_as;
107
7267c094 108 mapcache = g_malloc0(sizeof (MapCache));
432d268c 109
cd1ba7de
AP
110 mapcache->phys_offset_to_gaddr = f;
111 mapcache->opaque = opaque;
86a6a9bf 112 qemu_mutex_init(&mapcache->lock);
cd1ba7de 113
432d268c 114 QTAILQ_INIT(&mapcache->locked_entries);
432d268c 115
56c119e5
AP
116 if (geteuid() == 0) {
117 rlimit_as.rlim_cur = RLIM_INFINITY;
118 rlimit_as.rlim_max = RLIM_INFINITY;
119 mapcache->max_mcache_size = MCACHE_MAX_SIZE;
ea6c5f8f 120 } else {
56c119e5
AP
121 getrlimit(RLIMIT_AS, &rlimit_as);
122 rlimit_as.rlim_cur = rlimit_as.rlim_max;
123
124 if (rlimit_as.rlim_max != RLIM_INFINITY) {
125 fprintf(stderr, "Warning: QEMU's maximum size of virtual"
126 " memory is not infinity.\n");
127 }
128 if (rlimit_as.rlim_max < MCACHE_MAX_SIZE + NON_MCACHE_MEMORY_SIZE) {
129 mapcache->max_mcache_size = rlimit_as.rlim_max -
130 NON_MCACHE_MEMORY_SIZE;
131 } else {
132 mapcache->max_mcache_size = MCACHE_MAX_SIZE;
133 }
ea6c5f8f
JB
134 }
135
432d268c 136 setrlimit(RLIMIT_AS, &rlimit_as);
432d268c
JN
137
138 mapcache->nr_buckets =
139 (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
140 (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
141 (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
142
143 size = mapcache->nr_buckets * sizeof (MapCacheEntry);
144 size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
e41d7c69
JK
145 DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
146 mapcache->nr_buckets, size);
7267c094 147 mapcache->entry = g_malloc0(size);
432d268c
JN
148}
149
e41d7c69 150static void xen_remap_bucket(MapCacheEntry *entry,
a8170e5e
AK
151 hwaddr size,
152 hwaddr address_index)
432d268c
JN
153{
154 uint8_t *vaddr_base;
155 xen_pfn_t *pfns;
156 int *err;
ea6c5f8f 157 unsigned int i;
a8170e5e 158 hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
432d268c 159
e41d7c69 160 trace_xen_remap_bucket(address_index);
432d268c 161
7267c094
AL
162 pfns = g_malloc0(nb_pfn * sizeof (xen_pfn_t));
163 err = g_malloc0(nb_pfn * sizeof (int));
432d268c
JN
164
165 if (entry->vaddr_base != NULL) {
c13390cd 166 if (munmap(entry->vaddr_base, entry->size) != 0) {
432d268c
JN
167 perror("unmap fails");
168 exit(-1);
169 }
170 }
012aef07
MA
171 g_free(entry->valid_mapping);
172 entry->valid_mapping = NULL;
432d268c
JN
173
174 for (i = 0; i < nb_pfn; i++) {
175 pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
176 }
177
e0cb42ae
IC
178 vaddr_base = xenforeignmemory_map(xen_fmem, xen_domid, PROT_READ|PROT_WRITE,
179 nb_pfn, pfns, err);
432d268c 180 if (vaddr_base == NULL) {
e0cb42ae 181 perror("xenforeignmemory_map");
432d268c
JN
182 exit(-1);
183 }
184
185 entry->vaddr_base = vaddr_base;
186 entry->paddr_index = address_index;
c13390cd 187 entry->size = size;
7267c094 188 entry->valid_mapping = (unsigned long *) g_malloc0(sizeof(unsigned long) *
c13390cd 189 BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
432d268c 190
ea6c5f8f
JB
191 bitmap_zero(entry->valid_mapping, nb_pfn);
192 for (i = 0; i < nb_pfn; i++) {
193 if (!err[i]) {
194 bitmap_set(entry->valid_mapping, i, 1);
432d268c 195 }
432d268c
JN
196 }
197
7267c094
AL
198 g_free(pfns);
199 g_free(err);
432d268c
JN
200}
201
86a6a9bf
PB
202static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
203 uint8_t lock)
432d268c
JN
204{
205 MapCacheEntry *entry, *pentry = NULL;
a8170e5e
AK
206 hwaddr address_index;
207 hwaddr address_offset;
9b6d7b36
PB
208 hwaddr cache_size = size;
209 hwaddr test_bit_size;
cd1ba7de
AP
210 bool translated = false;
211
212tryagain:
213 address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
214 address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
432d268c 215
e41d7c69 216 trace_xen_map_cache(phys_addr);
432d268c 217
9b6d7b36 218 /* test_bit_size is always a multiple of XC_PAGE_SIZE */
044d4e1a 219 if (size) {
9b6d7b36 220 test_bit_size = size + (phys_addr & (XC_PAGE_SIZE - 1));
044d4e1a 221
9b6d7b36
PB
222 if (test_bit_size % XC_PAGE_SIZE) {
223 test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
044d4e1a
H
224 }
225 } else {
9b6d7b36 226 test_bit_size = XC_PAGE_SIZE;
044d4e1a
H
227 }
228
e2deee3e
SS
229 if (mapcache->last_entry != NULL &&
230 mapcache->last_entry->paddr_index == address_index &&
9b6d7b36 231 !lock && !size &&
044d4e1a 232 test_bits(address_offset >> XC_PAGE_SHIFT,
9b6d7b36 233 test_bit_size >> XC_PAGE_SHIFT,
044d4e1a 234 mapcache->last_entry->valid_mapping)) {
e2deee3e
SS
235 trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
236 return mapcache->last_entry->vaddr_base + address_offset;
432d268c
JN
237 }
238
c13390cd 239 /* size is always a multiple of MCACHE_BUCKET_SIZE */
09ab48ee 240 if (size) {
9b6d7b36
PB
241 cache_size = size + address_offset;
242 if (cache_size % MCACHE_BUCKET_SIZE) {
243 cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
09ab48ee
AP
244 }
245 } else {
9b6d7b36 246 cache_size = MCACHE_BUCKET_SIZE;
09ab48ee 247 }
c13390cd 248
432d268c
JN
249 entry = &mapcache->entry[address_index % mapcache->nr_buckets];
250
c13390cd 251 while (entry && entry->lock && entry->vaddr_base &&
9b6d7b36 252 (entry->paddr_index != address_index || entry->size != cache_size ||
044d4e1a 253 !test_bits(address_offset >> XC_PAGE_SHIFT,
9b6d7b36 254 test_bit_size >> XC_PAGE_SHIFT,
c13390cd 255 entry->valid_mapping))) {
432d268c
JN
256 pentry = entry;
257 entry = entry->next;
258 }
259 if (!entry) {
7267c094 260 entry = g_malloc0(sizeof (MapCacheEntry));
432d268c 261 pentry->next = entry;
9b6d7b36 262 xen_remap_bucket(entry, cache_size, address_index);
432d268c
JN
263 } else if (!entry->lock) {
264 if (!entry->vaddr_base || entry->paddr_index != address_index ||
9b6d7b36 265 entry->size != cache_size ||
044d4e1a 266 !test_bits(address_offset >> XC_PAGE_SHIFT,
9b6d7b36 267 test_bit_size >> XC_PAGE_SHIFT,
c13390cd 268 entry->valid_mapping)) {
9b6d7b36 269 xen_remap_bucket(entry, cache_size, address_index);
432d268c
JN
270 }
271 }
272
044d4e1a 273 if(!test_bits(address_offset >> XC_PAGE_SHIFT,
9b6d7b36 274 test_bit_size >> XC_PAGE_SHIFT,
c13390cd 275 entry->valid_mapping)) {
e2deee3e 276 mapcache->last_entry = NULL;
cd1ba7de
AP
277 if (!translated && mapcache->phys_offset_to_gaddr) {
278 phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
279 translated = true;
280 goto tryagain;
281 }
e41d7c69 282 trace_xen_map_cache_return(NULL);
432d268c
JN
283 return NULL;
284 }
285
e2deee3e 286 mapcache->last_entry = entry;
432d268c 287 if (lock) {
7267c094 288 MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev));
432d268c 289 entry->lock++;
e2deee3e
SS
290 reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
291 reventry->paddr_index = mapcache->last_entry->paddr_index;
c13390cd 292 reventry->size = entry->size;
432d268c
JN
293 QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
294 }
295
e2deee3e
SS
296 trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
297 return mapcache->last_entry->vaddr_base + address_offset;
432d268c
JN
298}
299
86a6a9bf
PB
300uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
301 uint8_t lock)
302{
303 uint8_t *p;
304
305 mapcache_lock();
306 p = xen_map_cache_unlocked(phys_addr, size, lock);
307 mapcache_unlock();
308 return p;
309}
310
e41d7c69 311ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
432d268c 312{
ecf169b7 313 MapCacheEntry *entry = NULL;
432d268c 314 MapCacheRev *reventry;
a8170e5e
AK
315 hwaddr paddr_index;
316 hwaddr size;
86a6a9bf 317 ram_addr_t raddr;
432d268c
JN
318 int found = 0;
319
86a6a9bf 320 mapcache_lock();
432d268c
JN
321 QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
322 if (reventry->vaddr_req == ptr) {
323 paddr_index = reventry->paddr_index;
c13390cd 324 size = reventry->size;
432d268c
JN
325 found = 1;
326 break;
327 }
328 }
329 if (!found) {
e41d7c69 330 fprintf(stderr, "%s, could not find %p\n", __func__, ptr);
432d268c
JN
331 QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
332 DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index,
333 reventry->vaddr_req);
334 }
335 abort();
336 return 0;
337 }
338
c13390cd
SS
339 entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
340 while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
c13390cd
SS
341 entry = entry->next;
342 }
343 if (!entry) {
344 DPRINTF("Trying to find address %p that is not in the mapcache!\n", ptr);
86a6a9bf
PB
345 raddr = 0;
346 } else {
347 raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
348 ((unsigned long) ptr - (unsigned long) entry->vaddr_base);
c13390cd 349 }
86a6a9bf
PB
350 mapcache_unlock();
351 return raddr;
432d268c
JN
352}
353
86a6a9bf 354static void xen_invalidate_map_cache_entry_unlocked(uint8_t *buffer)
432d268c
JN
355{
356 MapCacheEntry *entry = NULL, *pentry = NULL;
357 MapCacheRev *reventry;
a8170e5e
AK
358 hwaddr paddr_index;
359 hwaddr size;
432d268c
JN
360 int found = 0;
361
432d268c
JN
362 QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
363 if (reventry->vaddr_req == buffer) {
364 paddr_index = reventry->paddr_index;
c13390cd 365 size = reventry->size;
432d268c
JN
366 found = 1;
367 break;
368 }
369 }
370 if (!found) {
e41d7c69 371 DPRINTF("%s, could not find %p\n", __func__, buffer);
432d268c
JN
372 QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
373 DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index, reventry->vaddr_req);
374 }
375 return;
376 }
377 QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
7267c094 378 g_free(reventry);
432d268c 379
e2deee3e
SS
380 if (mapcache->last_entry != NULL &&
381 mapcache->last_entry->paddr_index == paddr_index) {
382 mapcache->last_entry = NULL;
27b7652e
FZ
383 }
384
432d268c 385 entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
c13390cd 386 while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
432d268c
JN
387 pentry = entry;
388 entry = entry->next;
389 }
390 if (!entry) {
391 DPRINTF("Trying to unmap address %p that is not in the mapcache!\n", buffer);
392 return;
393 }
394 entry->lock--;
395 if (entry->lock > 0 || pentry == NULL) {
396 return;
397 }
398
399 pentry->next = entry->next;
c13390cd 400 if (munmap(entry->vaddr_base, entry->size) != 0) {
432d268c
JN
401 perror("unmap fails");
402 exit(-1);
403 }
7267c094
AL
404 g_free(entry->valid_mapping);
405 g_free(entry);
432d268c
JN
406}
407
86a6a9bf
PB
408void xen_invalidate_map_cache_entry(uint8_t *buffer)
409{
410 mapcache_lock();
411 xen_invalidate_map_cache_entry_unlocked(buffer);
412 mapcache_unlock();
413}
414
e41d7c69 415void xen_invalidate_map_cache(void)
432d268c
JN
416{
417 unsigned long i;
418 MapCacheRev *reventry;
419
420 /* Flush pending AIO before destroying the mapcache */
922453bc 421 bdrv_drain_all();
432d268c 422
86a6a9bf
PB
423 mapcache_lock();
424
432d268c
JN
425 QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
426 DPRINTF("There should be no locked mappings at this time, "
427 "but "TARGET_FMT_plx" -> %p is present\n",
428 reventry->paddr_index, reventry->vaddr_req);
429 }
430
432d268c
JN
431 for (i = 0; i < mapcache->nr_buckets; i++) {
432 MapCacheEntry *entry = &mapcache->entry[i];
433
434 if (entry->vaddr_base == NULL) {
435 continue;
436 }
852a7cec
JG
437 if (entry->lock > 0) {
438 continue;
439 }
432d268c 440
c13390cd 441 if (munmap(entry->vaddr_base, entry->size) != 0) {
432d268c
JN
442 perror("unmap fails");
443 exit(-1);
444 }
445
446 entry->paddr_index = 0;
447 entry->vaddr_base = NULL;
c13390cd 448 entry->size = 0;
7267c094 449 g_free(entry->valid_mapping);
c13390cd 450 entry->valid_mapping = NULL;
432d268c
JN
451 }
452
e2deee3e 453 mapcache->last_entry = NULL;
432d268c
JN
454
455 mapcache_unlock();
456}