]>
Commit | Line | Data |
---|---|---|
bd322087 | 1 | /* |
d4443cb6 | 2 | * Virtio Balloon Device |
bd322087 AL |
3 | * |
4 | * Copyright IBM, Corp. 2008 | |
d4443cb6 AS |
5 | * Copyright (C) 2011 Red Hat, Inc. |
6 | * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com> | |
bd322087 AL |
7 | * |
8 | * Authors: | |
9 | * Anthony Liguori <aliguori@us.ibm.com> | |
10 | * | |
11 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
12 | * the COPYING file in the top-level directory. | |
13 | * | |
14 | */ | |
15 | ||
9b8bfe21 | 16 | #include "qemu/osdep.h" |
1de7afc9 | 17 | #include "qemu/iov.h" |
0b8fa32f | 18 | #include "qemu/module.h" |
7e6ccd9c | 19 | #include "qemu/timer.h" |
b85ea5fa | 20 | #include "qemu/madvise.h" |
0d09e41a | 21 | #include "hw/virtio/virtio.h" |
2070aaeb | 22 | #include "hw/mem/pc-dimm.h" |
a27bd6c7 | 23 | #include "hw/qdev-properties.h" |
b326b6ea | 24 | #include "hw/boards.h" |
9c17d615 | 25 | #include "sysemu/balloon.h" |
0d09e41a | 26 | #include "hw/virtio/virtio-balloon.h" |
022c62cb | 27 | #include "exec/address-spaces.h" |
e688df6b | 28 | #include "qapi/error.h" |
a83e24ba | 29 | #include "qapi/qapi-events-machine.h" |
7e6ccd9c | 30 | #include "qapi/visitor.h" |
6adfdc5a | 31 | #include "trace.h" |
2ab4b135 | 32 | #include "qemu/error-report.h" |
c13c4153 | 33 | #include "migration/misc.h" |
bd322087 | 34 | |
0d09e41a | 35 | #include "hw/virtio/virtio-bus.h" |
8609d2a8 | 36 | #include "hw/virtio/virtio-access.h" |
1ab461b5 | 37 | |
01310e2a TH |
38 | #define BALLOON_PAGE_SIZE (1 << VIRTIO_BALLOON_PFN_SHIFT) |
39 | ||
a8cd64d4 | 40 | typedef struct PartiallyBalloonedPage { |
1c5cfc2b | 41 | ram_addr_t base_gpa; |
1c5cfc2b | 42 | unsigned long *bitmap; |
a8cd64d4 | 43 | } PartiallyBalloonedPage; |
ed48c598 | 44 | |
1c5cfc2b DH |
45 | static void virtio_balloon_pbp_free(PartiallyBalloonedPage *pbp) |
46 | { | |
1b47b37c | 47 | if (!pbp->bitmap) { |
1c5cfc2b DH |
48 | return; |
49 | } | |
50 | g_free(pbp->bitmap); | |
1b47b37c | 51 | pbp->bitmap = NULL; |
1c5cfc2b DH |
52 | } |
53 | ||
1b47b37c MT |
54 | static void virtio_balloon_pbp_alloc(PartiallyBalloonedPage *pbp, |
55 | ram_addr_t base_gpa, | |
56 | long subpages) | |
1c5cfc2b | 57 | { |
1c5cfc2b | 58 | pbp->base_gpa = base_gpa; |
1c5cfc2b | 59 | pbp->bitmap = bitmap_new(subpages); |
1c5cfc2b DH |
60 | } |
61 | ||
62 | static bool virtio_balloon_pbp_matches(PartiallyBalloonedPage *pbp, | |
9a7ca8a7 | 63 | ram_addr_t base_gpa) |
1c5cfc2b | 64 | { |
9a7ca8a7 | 65 | return pbp->base_gpa == base_gpa; |
1c5cfc2b DH |
66 | } |
67 | ||
06df2e69 DH |
68 | static bool virtio_balloon_inhibited(void) |
69 | { | |
1a8e44a8 AG |
70 | /* |
71 | * Postcopy cannot deal with concurrent discards, | |
72 | * so it's special, as well as background snapshots. | |
73 | */ | |
74 | return ram_block_discard_is_disabled() || migration_in_incoming_postcopy() || | |
75 | migration_in_bg_snapshot(); | |
06df2e69 DH |
76 | } |
77 | ||
e9550234 | 78 | static void balloon_inflate_page(VirtIOBalloon *balloon, |
a8cd64d4 | 79 | MemoryRegion *mr, hwaddr mr_offset, |
1b47b37c | 80 | PartiallyBalloonedPage *pbp) |
bd322087 | 81 | { |
e6129b27 | 82 | void *addr = memory_region_get_ram_ptr(mr) + mr_offset; |
1c5cfc2b | 83 | ram_addr_t rb_offset, rb_aligned_offset, base_gpa; |
dbe1a277 DG |
84 | RAMBlock *rb; |
85 | size_t rb_page_size; | |
ed48c598 | 86 | int subpages; |
e9550234 | 87 | |
dbe1a277 DG |
88 | /* XXX is there a better way to get to the RAMBlock than via a |
89 | * host address? */ | |
e6129b27 | 90 | rb = qemu_ram_block_from_host(addr, false, &rb_offset); |
dbe1a277 | 91 | rb_page_size = qemu_ram_pagesize(rb); |
ed48c598 DG |
92 | |
93 | if (rb_page_size == BALLOON_PAGE_SIZE) { | |
94 | /* Easy case */ | |
dbe1a277 | 95 | |
e6129b27 | 96 | ram_block_discard_range(rb, rb_offset, rb_page_size); |
ed48c598 DG |
97 | /* We ignore errors from ram_block_discard_range(), because it |
98 | * has already reported them, and failing to discard a balloon | |
99 | * page is not fatal */ | |
dbe1a277 DG |
100 | return; |
101 | } | |
102 | ||
ed48c598 DG |
103 | /* Hard case |
104 | * | |
105 | * We've put a piece of a larger host page into the balloon - we | |
106 | * need to keep track until we have a whole host page to | |
107 | * discard | |
108 | */ | |
109 | warn_report_once( | |
110 | "Balloon used with backing page size > 4kiB, this may not be reliable"); | |
111 | ||
e6129b27 | 112 | rb_aligned_offset = QEMU_ALIGN_DOWN(rb_offset, rb_page_size); |
ed48c598 | 113 | subpages = rb_page_size / BALLOON_PAGE_SIZE; |
1c5cfc2b DH |
114 | base_gpa = memory_region_get_ram_addr(mr) + mr_offset - |
115 | (rb_offset - rb_aligned_offset); | |
ed48c598 | 116 | |
1b47b37c | 117 | if (pbp->bitmap && !virtio_balloon_pbp_matches(pbp, base_gpa)) { |
ed48c598 DG |
118 | /* We've partially ballooned part of a host page, but now |
119 | * we're trying to balloon part of a different one. Too hard, | |
120 | * give up on the old partial page */ | |
1b47b37c | 121 | virtio_balloon_pbp_free(pbp); |
dbe1a277 DG |
122 | } |
123 | ||
1b47b37c MT |
124 | if (!pbp->bitmap) { |
125 | virtio_balloon_pbp_alloc(pbp, base_gpa, subpages); | |
ed48c598 DG |
126 | } |
127 | ||
1c5cfc2b | 128 | set_bit((rb_offset - rb_aligned_offset) / BALLOON_PAGE_SIZE, |
1b47b37c | 129 | pbp->bitmap); |
ed48c598 | 130 | |
1b47b37c | 131 | if (bitmap_full(pbp->bitmap, subpages)) { |
ed48c598 DG |
132 | /* We've accumulated a full host page, we can actually discard |
133 | * it now */ | |
134 | ||
1c5cfc2b | 135 | ram_block_discard_range(rb, rb_aligned_offset, rb_page_size); |
ed48c598 DG |
136 | /* We ignore errors from ram_block_discard_range(), because it |
137 | * has already reported them, and failing to discard a balloon | |
138 | * page is not fatal */ | |
1b47b37c | 139 | virtio_balloon_pbp_free(pbp); |
ed48c598 | 140 | } |
bd322087 AL |
141 | } |
142 | ||
b27b3239 | 143 | static void balloon_deflate_page(VirtIOBalloon *balloon, |
e6129b27 | 144 | MemoryRegion *mr, hwaddr mr_offset) |
b27b3239 | 145 | { |
e6129b27 DH |
146 | void *addr = memory_region_get_ram_ptr(mr) + mr_offset; |
147 | ram_addr_t rb_offset; | |
b27b3239 DG |
148 | RAMBlock *rb; |
149 | size_t rb_page_size; | |
596546fe DG |
150 | void *host_addr; |
151 | int ret; | |
b27b3239 DG |
152 | |
153 | /* XXX is there a better way to get to the RAMBlock than via a | |
154 | * host address? */ | |
e6129b27 | 155 | rb = qemu_ram_block_from_host(addr, false, &rb_offset); |
b27b3239 | 156 | rb_page_size = qemu_ram_pagesize(rb); |
b27b3239 | 157 | |
596546fe DG |
158 | host_addr = (void *)((uintptr_t)addr & ~(rb_page_size - 1)); |
159 | ||
160 | /* When a page is deflated, we hint the whole host page it lives | |
161 | * on, since we can't do anything smaller */ | |
162 | ret = qemu_madvise(host_addr, rb_page_size, QEMU_MADV_WILLNEED); | |
163 | if (ret != 0) { | |
164 | warn_report("Couldn't MADV_WILLNEED on balloon deflate: %s", | |
165 | strerror(errno)); | |
166 | /* Otherwise ignore, failing to page hint shouldn't be fatal */ | |
167 | } | |
b27b3239 DG |
168 | } |
169 | ||
7e6ccd9c LC |
170 | static const char *balloon_stat_names[] = { |
171 | [VIRTIO_BALLOON_S_SWAP_IN] = "stat-swap-in", | |
172 | [VIRTIO_BALLOON_S_SWAP_OUT] = "stat-swap-out", | |
173 | [VIRTIO_BALLOON_S_MAJFLT] = "stat-major-faults", | |
174 | [VIRTIO_BALLOON_S_MINFLT] = "stat-minor-faults", | |
175 | [VIRTIO_BALLOON_S_MEMFREE] = "stat-free-memory", | |
176 | [VIRTIO_BALLOON_S_MEMTOT] = "stat-total-memory", | |
a0d06486 | 177 | [VIRTIO_BALLOON_S_AVAIL] = "stat-available-memory", |
bf1e7140 | 178 | [VIRTIO_BALLOON_S_CACHES] = "stat-disk-caches", |
b7b12644 JH |
179 | [VIRTIO_BALLOON_S_HTLB_PGALLOC] = "stat-htlb-pgalloc", |
180 | [VIRTIO_BALLOON_S_HTLB_PGFAIL] = "stat-htlb-pgfail", | |
7e6ccd9c LC |
181 | [VIRTIO_BALLOON_S_NR] = NULL |
182 | }; | |
183 | ||
625a5bef AL |
184 | /* |
185 | * reset_stats - Mark all items in the stats array as unset | |
186 | * | |
52f35022 SW |
187 | * This function needs to be called at device initialization and before |
188 | * updating to a set of newly-generated stats. This will ensure that no | |
625a5bef AL |
189 | * stale values stick around in case the guest reports a subset of the supported |
190 | * statistics. | |
191 | */ | |
192 | static inline void reset_stats(VirtIOBalloon *dev) | |
193 | { | |
194 | int i; | |
195 | for (i = 0; i < VIRTIO_BALLOON_S_NR; dev->stats[i++] = -1); | |
196 | } | |
197 | ||
7e6ccd9c LC |
198 | static bool balloon_stats_supported(const VirtIOBalloon *s) |
199 | { | |
c96caced | 200 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
95129d6f | 201 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_STATS_VQ); |
7e6ccd9c LC |
202 | } |
203 | ||
204 | static bool balloon_stats_enabled(const VirtIOBalloon *s) | |
205 | { | |
206 | return s->stats_poll_interval > 0; | |
207 | } | |
208 | ||
209 | static void balloon_stats_destroy_timer(VirtIOBalloon *s) | |
210 | { | |
211 | if (balloon_stats_enabled(s)) { | |
bc72ad67 | 212 | timer_free(s->stats_timer); |
7e6ccd9c LC |
213 | s->stats_timer = NULL; |
214 | s->stats_poll_interval = 0; | |
215 | } | |
216 | } | |
217 | ||
1f9296b5 | 218 | static void balloon_stats_change_timer(VirtIOBalloon *s, int64_t secs) |
7e6ccd9c | 219 | { |
bc72ad67 | 220 | timer_mod(s->stats_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + secs * 1000); |
7e6ccd9c LC |
221 | } |
222 | ||
223 | static void balloon_stats_poll_cb(void *opaque) | |
224 | { | |
225 | VirtIOBalloon *s = opaque; | |
c96caced | 226 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
7e6ccd9c | 227 | |
4eae2a65 | 228 | if (s->stats_vq_elem == NULL || !balloon_stats_supported(s)) { |
7e6ccd9c LC |
229 | /* re-schedule */ |
230 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
231 | return; | |
232 | } | |
233 | ||
d3f1f940 | 234 | virtqueue_push(s->svq, s->stats_vq_elem, 0); |
c96caced | 235 | virtio_notify(vdev, s->svq); |
51b19ebe PB |
236 | g_free(s->stats_vq_elem); |
237 | s->stats_vq_elem = NULL; | |
7e6ccd9c LC |
238 | } |
239 | ||
d7bce999 EB |
240 | static void balloon_stats_get_all(Object *obj, Visitor *v, const char *name, |
241 | void *opaque, Error **errp) | |
7e6ccd9c | 242 | { |
a2d860bb | 243 | VirtIOBalloon *s = VIRTIO_BALLOON(obj); |
d1c81c34 | 244 | bool ok = false; |
7e6ccd9c LC |
245 | int i; |
246 | ||
d1c81c34 MA |
247 | if (!visit_start_struct(v, name, NULL, 0, errp)) { |
248 | return; | |
2ddb16a9 | 249 | } |
d1c81c34 | 250 | if (!visit_type_int(v, "last-update", &s->stats_last_update, errp)) { |
297a3646 MA |
251 | goto out_end; |
252 | } | |
7e6ccd9c | 253 | |
d1c81c34 | 254 | if (!visit_start_struct(v, "stats", NULL, 0, errp)) { |
2ddb16a9 MA |
255 | goto out_end; |
256 | } | |
9dbb8fa7 | 257 | for (i = 0; i < VIRTIO_BALLOON_S_NR; i++) { |
d1c81c34 | 258 | if (!visit_type_uint64(v, balloon_stat_names[i], &s->stats[i], errp)) { |
15c2f669 | 259 | goto out_nested; |
9dbb8fa7 | 260 | } |
7e6ccd9c | 261 | } |
d1c81c34 | 262 | ok = visit_check_struct(v, errp); |
15c2f669 | 263 | out_nested: |
1158bb2a | 264 | visit_end_struct(v, NULL); |
2ddb16a9 | 265 | |
d1c81c34 MA |
266 | if (ok) { |
267 | visit_check_struct(v, errp); | |
15c2f669 | 268 | } |
2ddb16a9 | 269 | out_end: |
1158bb2a | 270 | visit_end_struct(v, NULL); |
7e6ccd9c LC |
271 | } |
272 | ||
4fa45492 | 273 | static void balloon_stats_get_poll_interval(Object *obj, Visitor *v, |
d7bce999 | 274 | const char *name, void *opaque, |
7e6ccd9c LC |
275 | Error **errp) |
276 | { | |
a2d860bb | 277 | VirtIOBalloon *s = VIRTIO_BALLOON(obj); |
51e72bc1 | 278 | visit_type_int(v, name, &s->stats_poll_interval, errp); |
7e6ccd9c LC |
279 | } |
280 | ||
4fa45492 | 281 | static void balloon_stats_set_poll_interval(Object *obj, Visitor *v, |
d7bce999 | 282 | const char *name, void *opaque, |
7e6ccd9c LC |
283 | Error **errp) |
284 | { | |
a2d860bb | 285 | VirtIOBalloon *s = VIRTIO_BALLOON(obj); |
7e6ccd9c LC |
286 | int64_t value; |
287 | ||
668f62ec | 288 | if (!visit_type_int(v, name, &value, errp)) { |
7e6ccd9c LC |
289 | return; |
290 | } | |
291 | ||
292 | if (value < 0) { | |
293 | error_setg(errp, "timer value must be greater than zero"); | |
294 | return; | |
295 | } | |
296 | ||
22644cd2 | 297 | if (value > UINT32_MAX) { |
1f9296b5 LC |
298 | error_setg(errp, "timer value is too big"); |
299 | return; | |
300 | } | |
301 | ||
7e6ccd9c LC |
302 | if (value == s->stats_poll_interval) { |
303 | return; | |
304 | } | |
305 | ||
306 | if (value == 0) { | |
307 | /* timer=0 disables the timer */ | |
308 | balloon_stats_destroy_timer(s); | |
309 | return; | |
310 | } | |
311 | ||
312 | if (balloon_stats_enabled(s)) { | |
313 | /* timer interval change */ | |
314 | s->stats_poll_interval = value; | |
315 | balloon_stats_change_timer(s, value); | |
316 | return; | |
317 | } | |
318 | ||
319 | /* create a new timer */ | |
320 | g_assert(s->stats_timer == NULL); | |
bc72ad67 | 321 | s->stats_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, balloon_stats_poll_cb, s); |
7e6ccd9c LC |
322 | s->stats_poll_interval = value; |
323 | balloon_stats_change_timer(s, 0); | |
324 | } | |
325 | ||
91b86719 AD |
326 | static void virtio_balloon_handle_report(VirtIODevice *vdev, VirtQueue *vq) |
327 | { | |
328 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); | |
329 | VirtQueueElement *elem; | |
330 | ||
331 | while ((elem = virtqueue_pop(vq, sizeof(VirtQueueElement)))) { | |
332 | unsigned int i; | |
333 | ||
334 | /* | |
335 | * When we discard the page it has the effect of removing the page | |
336 | * from the hypervisor itself and causing it to be zeroed when it | |
337 | * is returned to us. So we must not discard the page if it is | |
338 | * accessible by another device or process, or if the guest is | |
339 | * expecting it to retain a non-zero value. | |
340 | */ | |
06df2e69 | 341 | if (virtio_balloon_inhibited() || dev->poison_val) { |
91b86719 AD |
342 | goto skip_element; |
343 | } | |
344 | ||
345 | for (i = 0; i < elem->in_num; i++) { | |
346 | void *addr = elem->in_sg[i].iov_base; | |
347 | size_t size = elem->in_sg[i].iov_len; | |
348 | ram_addr_t ram_offset; | |
349 | RAMBlock *rb; | |
350 | ||
351 | /* | |
352 | * There is no need to check the memory section to see if | |
353 | * it is ram/readonly/romd like there is for handle_output | |
354 | * below. If the region is not meant to be written to then | |
355 | * address_space_map will have allocated a bounce buffer | |
356 | * and it will be freed in address_space_unmap and trigger | |
357 | * and unassigned_mem_write before failing to copy over the | |
358 | * buffer. If more than one bad descriptor is provided it | |
359 | * will return NULL after the first bounce buffer and fail | |
360 | * to map any resources. | |
361 | */ | |
362 | rb = qemu_ram_block_from_host(addr, false, &ram_offset); | |
363 | if (!rb) { | |
364 | trace_virtio_balloon_bad_addr(elem->in_addr[i]); | |
365 | continue; | |
366 | } | |
367 | ||
368 | /* | |
369 | * For now we will simply ignore unaligned memory regions, or | |
370 | * regions that overrun the end of the RAMBlock. | |
371 | */ | |
372 | if (!QEMU_IS_ALIGNED(ram_offset | size, qemu_ram_pagesize(rb)) || | |
373 | (ram_offset + size) > qemu_ram_get_used_length(rb)) { | |
374 | continue; | |
375 | } | |
376 | ||
377 | ram_block_discard_range(rb, ram_offset, size); | |
378 | } | |
379 | ||
380 | skip_element: | |
381 | virtqueue_push(vq, elem, 0); | |
382 | virtio_notify(vdev, vq); | |
383 | g_free(elem); | |
384 | } | |
385 | } | |
386 | ||
bd322087 AL |
387 | static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
388 | { | |
c96caced | 389 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); |
51b19ebe | 390 | VirtQueueElement *elem; |
b7c28c74 | 391 | MemoryRegionSection section; |
bd322087 | 392 | |
51b19ebe | 393 | for (;;) { |
1b47b37c | 394 | PartiallyBalloonedPage pbp = {}; |
bd322087 AL |
395 | size_t offset = 0; |
396 | uint32_t pfn; | |
1b47b37c | 397 | |
51b19ebe PB |
398 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
399 | if (!elem) { | |
a8cd64d4 | 400 | break; |
51b19ebe | 401 | } |
bd322087 | 402 | |
51b19ebe | 403 | while (iov_to_buf(elem->out_sg, elem->out_num, offset, &pfn, 4) == 4) { |
ffa207d0 | 404 | unsigned int p = virtio_ldl_p(vdev, &pfn); |
b218a70e | 405 | hwaddr pa; |
bd322087 | 406 | |
b218a70e | 407 | pa = (hwaddr) p << VIRTIO_BALLOON_PFN_SHIFT; |
bd322087 AL |
408 | offset += 4; |
409 | ||
b218a70e DG |
410 | section = memory_region_find(get_system_memory(), pa, |
411 | BALLOON_PAGE_SIZE); | |
412 | if (!section.mr) { | |
413 | trace_virtio_balloon_bad_addr(pa); | |
414 | continue; | |
415 | } | |
416 | if (!memory_region_is_ram(section.mr) || | |
f2fd57db DDAG |
417 | memory_region_is_rom(section.mr) || |
418 | memory_region_is_romd(section.mr)) { | |
419 | trace_virtio_balloon_bad_addr(pa); | |
b86107ab | 420 | memory_region_unref(section.mr); |
bd322087 | 421 | continue; |
f2fd57db | 422 | } |
bd322087 | 423 | |
6adfdc5a HZ |
424 | trace_virtio_balloon_handle_output(memory_region_name(section.mr), |
425 | pa); | |
06df2e69 | 426 | if (!virtio_balloon_inhibited()) { |
b27b3239 DG |
427 | if (vq == s->ivq) { |
428 | balloon_inflate_page(s, section.mr, | |
a8cd64d4 | 429 | section.offset_within_region, &pbp); |
b27b3239 DG |
430 | } else if (vq == s->dvq) { |
431 | balloon_deflate_page(s, section.mr, section.offset_within_region); | |
432 | } else { | |
433 | g_assert_not_reached(); | |
434 | } | |
e9550234 | 435 | } |
dfde4e6e | 436 | memory_region_unref(section.mr); |
bd322087 AL |
437 | } |
438 | ||
d3f1f940 | 439 | virtqueue_push(vq, elem, 0); |
bd322087 | 440 | virtio_notify(vdev, vq); |
51b19ebe | 441 | g_free(elem); |
1b47b37c | 442 | virtio_balloon_pbp_free(&pbp); |
bd322087 AL |
443 | } |
444 | } | |
445 | ||
625a5bef AL |
446 | static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq) |
447 | { | |
c96caced | 448 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); |
51b19ebe | 449 | VirtQueueElement *elem; |
625a5bef AL |
450 | VirtIOBalloonStat stat; |
451 | size_t offset = 0; | |
452 | ||
4eae2a65 | 453 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
51b19ebe | 454 | if (!elem) { |
7e6ccd9c | 455 | goto out; |
625a5bef AL |
456 | } |
457 | ||
4eae2a65 LP |
458 | if (s->stats_vq_elem != NULL) { |
459 | /* This should never happen if the driver follows the spec. */ | |
460 | virtqueue_push(vq, s->stats_vq_elem, 0); | |
461 | virtio_notify(vdev, vq); | |
462 | g_free(s->stats_vq_elem); | |
463 | } | |
464 | ||
465 | s->stats_vq_elem = elem; | |
466 | ||
625a5bef AL |
467 | /* Initialize the stats to get rid of any stale values. This is only |
468 | * needed to handle the case where a guest supports fewer stats than it | |
469 | * used to (ie. it has booted into an old kernel). | |
470 | */ | |
471 | reset_stats(s); | |
472 | ||
dcf6f5e1 | 473 | while (iov_to_buf(elem->out_sg, elem->out_num, offset, &stat, sizeof(stat)) |
fa6111f2 | 474 | == sizeof(stat)) { |
8609d2a8 RR |
475 | uint16_t tag = virtio_tswap16(vdev, stat.tag); |
476 | uint64_t val = virtio_tswap64(vdev, stat.val); | |
625a5bef AL |
477 | |
478 | offset += sizeof(stat); | |
479 | if (tag < VIRTIO_BALLOON_S_NR) | |
480 | s->stats[tag] = val; | |
481 | } | |
482 | s->stats_vq_offset = offset; | |
f793dde0 | 483 | s->stats_last_update = g_get_real_time() / G_USEC_PER_SEC; |
7e6ccd9c LC |
484 | |
485 | out: | |
486 | if (balloon_stats_enabled(s)) { | |
487 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
488 | } | |
625a5bef AL |
489 | } |
490 | ||
c13c4153 WW |
491 | static void virtio_balloon_handle_free_page_vq(VirtIODevice *vdev, |
492 | VirtQueue *vq) | |
493 | { | |
494 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
495 | qemu_bh_schedule(s->free_page_bh); | |
496 | } | |
497 | ||
498 | static bool get_free_page_hints(VirtIOBalloon *dev) | |
499 | { | |
500 | VirtQueueElement *elem; | |
501 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
502 | VirtQueue *vq = dev->free_page_vq; | |
ae440bd1 | 503 | bool ret = true; |
0fe7245d | 504 | int i; |
c13c4153 WW |
505 | |
506 | while (dev->block_iothread) { | |
507 | qemu_cond_wait(&dev->free_page_cond, &dev->free_page_lock); | |
508 | } | |
509 | ||
510 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); | |
511 | if (!elem) { | |
512 | return false; | |
513 | } | |
514 | ||
515 | if (elem->out_num) { | |
516 | uint32_t id; | |
517 | size_t size = iov_to_buf(elem->out_sg, elem->out_num, 0, | |
518 | &id, sizeof(id)); | |
c13c4153 WW |
519 | |
520 | virtio_tswap32s(vdev, &id); | |
521 | if (unlikely(size != sizeof(id))) { | |
522 | virtio_error(vdev, "received an incorrect cmd id"); | |
ae440bd1 WW |
523 | ret = false; |
524 | goto out; | |
c13c4153 | 525 | } |
3219b42f AD |
526 | if (dev->free_page_hint_status == FREE_PAGE_HINT_S_REQUESTED && |
527 | id == dev->free_page_hint_cmd_id) { | |
528 | dev->free_page_hint_status = FREE_PAGE_HINT_S_START; | |
2d050ed0 | 529 | } else if (dev->free_page_hint_status == FREE_PAGE_HINT_S_START) { |
c13c4153 WW |
530 | /* |
531 | * Stop the optimization only when it has started. This | |
532 | * avoids a stale stop sign for the previous command. | |
533 | */ | |
2d050ed0 | 534 | dev->free_page_hint_status = FREE_PAGE_HINT_S_STOP; |
c13c4153 WW |
535 | } |
536 | } | |
537 | ||
2d050ed0 | 538 | if (elem->in_num && dev->free_page_hint_status == FREE_PAGE_HINT_S_START) { |
0fe7245d JW |
539 | for (i = 0; i < elem->in_num; i++) { |
540 | qemu_guest_free_page_hint(elem->in_sg[i].iov_base, | |
541 | elem->in_sg[i].iov_len); | |
542 | } | |
c13c4153 WW |
543 | } |
544 | ||
ae440bd1 | 545 | out: |
d3f1f940 | 546 | virtqueue_push(vq, elem, 0); |
ae440bd1 WW |
547 | g_free(elem); |
548 | return ret; | |
c13c4153 WW |
549 | } |
550 | ||
551 | static void virtio_ballloon_get_free_page_hints(void *opaque) | |
552 | { | |
553 | VirtIOBalloon *dev = opaque; | |
554 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
555 | VirtQueue *vq = dev->free_page_vq; | |
556 | bool continue_to_get_hints; | |
557 | ||
558 | do { | |
559 | qemu_mutex_lock(&dev->free_page_lock); | |
560 | virtio_queue_set_notification(vq, 0); | |
561 | continue_to_get_hints = get_free_page_hints(dev); | |
562 | qemu_mutex_unlock(&dev->free_page_lock); | |
563 | virtio_notify(vdev, vq); | |
564 | /* | |
3219b42f | 565 | * Start to poll the vq once the hinting started. Otherwise, continue |
c13c4153 WW |
566 | * only when there are entries on the vq, which need to be given back. |
567 | */ | |
568 | } while (continue_to_get_hints || | |
3219b42f | 569 | dev->free_page_hint_status == FREE_PAGE_HINT_S_START); |
c13c4153 WW |
570 | virtio_queue_set_notification(vq, 1); |
571 | } | |
572 | ||
573 | static bool virtio_balloon_free_page_support(void *opaque) | |
574 | { | |
575 | VirtIOBalloon *s = opaque; | |
576 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
577 | ||
578 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT); | |
579 | } | |
580 | ||
581 | static void virtio_balloon_free_page_start(VirtIOBalloon *s) | |
582 | { | |
583 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
584 | ||
1a83e0b9 AD |
585 | qemu_mutex_lock(&s->free_page_lock); |
586 | ||
3219b42f | 587 | if (s->free_page_hint_cmd_id == UINT_MAX) { |
2d050ed0 | 588 | s->free_page_hint_cmd_id = VIRTIO_BALLOON_FREE_PAGE_HINT_CMD_ID_MIN; |
c13c4153 | 589 | } else { |
3219b42f | 590 | s->free_page_hint_cmd_id++; |
c13c4153 WW |
591 | } |
592 | ||
3219b42f | 593 | s->free_page_hint_status = FREE_PAGE_HINT_S_REQUESTED; |
1a83e0b9 AD |
594 | qemu_mutex_unlock(&s->free_page_lock); |
595 | ||
c13c4153 WW |
596 | virtio_notify_config(vdev); |
597 | } | |
598 | ||
599 | static void virtio_balloon_free_page_stop(VirtIOBalloon *s) | |
600 | { | |
601 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
602 | ||
3219b42f | 603 | if (s->free_page_hint_status != FREE_PAGE_HINT_S_STOP) { |
c13c4153 WW |
604 | /* |
605 | * The lock also guarantees us that the | |
606 | * virtio_ballloon_get_free_page_hints exits after the | |
3219b42f | 607 | * free_page_hint_status is set to S_STOP. |
c13c4153 WW |
608 | */ |
609 | qemu_mutex_lock(&s->free_page_lock); | |
610 | /* | |
3219b42f AD |
611 | * The guest isn't done hinting, so send a notification |
612 | * to the guest to actively stop the hinting. | |
c13c4153 | 613 | */ |
3219b42f | 614 | s->free_page_hint_status = FREE_PAGE_HINT_S_STOP; |
c13c4153 WW |
615 | qemu_mutex_unlock(&s->free_page_lock); |
616 | virtio_notify_config(vdev); | |
617 | } | |
618 | } | |
619 | ||
620 | static void virtio_balloon_free_page_done(VirtIOBalloon *s) | |
621 | { | |
622 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
623 | ||
3219b42f | 624 | if (s->free_page_hint_status != FREE_PAGE_HINT_S_DONE) { |
dd8eeb96 DH |
625 | /* See virtio_balloon_free_page_stop() */ |
626 | qemu_mutex_lock(&s->free_page_lock); | |
3219b42f | 627 | s->free_page_hint_status = FREE_PAGE_HINT_S_DONE; |
dd8eeb96 DH |
628 | qemu_mutex_unlock(&s->free_page_lock); |
629 | virtio_notify_config(vdev); | |
630 | } | |
c13c4153 WW |
631 | } |
632 | ||
633 | static int | |
be19d836 SS |
634 | virtio_balloon_free_page_hint_notify(NotifierWithReturn *n, void *data, |
635 | Error **errp) | |
c13c4153 | 636 | { |
2d050ed0 | 637 | VirtIOBalloon *dev = container_of(n, VirtIOBalloon, free_page_hint_notify); |
c13c4153 WW |
638 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
639 | PrecopyNotifyData *pnd = data; | |
640 | ||
641 | if (!virtio_balloon_free_page_support(dev)) { | |
642 | /* | |
643 | * This is an optimization provided to migration, so just return 0 to | |
644 | * have the normal migration process not affected when this feature is | |
645 | * not supported. | |
646 | */ | |
647 | return 0; | |
648 | } | |
649 | ||
fd51e54f DH |
650 | /* |
651 | * Pages hinted via qemu_guest_free_page_hint() are cleared from the dirty | |
652 | * bitmap and will not get migrated, especially also not when the postcopy | |
653 | * destination starts using them and requests migration from the source; the | |
654 | * faulting thread will stall until postcopy migration finishes and | |
655 | * all threads are woken up. Let's not start free page hinting if postcopy | |
656 | * is possible. | |
657 | */ | |
658 | if (migrate_postcopy_ram()) { | |
659 | return 0; | |
660 | } | |
661 | ||
c13c4153 | 662 | switch (pnd->reason) { |
c13c4153 WW |
663 | case PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC: |
664 | virtio_balloon_free_page_stop(dev); | |
665 | break; | |
666 | case PRECOPY_NOTIFY_AFTER_BITMAP_SYNC: | |
667 | if (vdev->vm_running) { | |
668 | virtio_balloon_free_page_start(dev); | |
dd8eeb96 | 669 | break; |
c13c4153 | 670 | } |
dd8eeb96 DH |
671 | /* |
672 | * Set S_DONE before migrating the vmstate, so the guest will reuse | |
673 | * all hinted pages once running on the destination. Fall through. | |
674 | */ | |
675 | case PRECOPY_NOTIFY_CLEANUP: | |
676 | /* | |
677 | * Especially, if something goes wrong during precopy or if migration | |
678 | * is canceled, we have to properly communicate S_DONE to the VM. | |
679 | */ | |
680 | virtio_balloon_free_page_done(dev); | |
681 | break; | |
1a373522 | 682 | case PRECOPY_NOTIFY_SETUP: |
dd8eeb96 | 683 | case PRECOPY_NOTIFY_COMPLETE: |
c13c4153 WW |
684 | break; |
685 | default: | |
686 | virtio_error(vdev, "%s: %d reason unknown", __func__, pnd->reason); | |
687 | } | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
2bbadb08 SH |
692 | static size_t virtio_balloon_config_size(VirtIOBalloon *s) |
693 | { | |
694 | uint64_t features = s->host_features; | |
695 | ||
696 | if (s->qemu_4_0_config_size) { | |
697 | return sizeof(struct virtio_balloon_config); | |
698 | } | |
699 | if (virtio_has_feature(features, VIRTIO_BALLOON_F_PAGE_POISON)) { | |
700 | return sizeof(struct virtio_balloon_config); | |
701 | } | |
702 | if (virtio_has_feature(features, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { | |
703 | return offsetof(struct virtio_balloon_config, poison_val); | |
704 | } | |
3219b42f | 705 | return offsetof(struct virtio_balloon_config, free_page_hint_cmd_id); |
2bbadb08 SH |
706 | } |
707 | ||
bd322087 AL |
708 | static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data) |
709 | { | |
c96caced | 710 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
5385a598 | 711 | struct virtio_balloon_config config = {}; |
bd322087 AL |
712 | |
713 | config.num_pages = cpu_to_le32(dev->num_pages); | |
714 | config.actual = cpu_to_le32(dev->actual); | |
7483cbba | 715 | config.poison_val = cpu_to_le32(dev->poison_val); |
bd322087 | 716 | |
3219b42f AD |
717 | if (dev->free_page_hint_status == FREE_PAGE_HINT_S_REQUESTED) { |
718 | config.free_page_hint_cmd_id = | |
719 | cpu_to_le32(dev->free_page_hint_cmd_id); | |
720 | } else if (dev->free_page_hint_status == FREE_PAGE_HINT_S_STOP) { | |
721 | config.free_page_hint_cmd_id = | |
c13c4153 | 722 | cpu_to_le32(VIRTIO_BALLOON_CMD_ID_STOP); |
3219b42f AD |
723 | } else if (dev->free_page_hint_status == FREE_PAGE_HINT_S_DONE) { |
724 | config.free_page_hint_cmd_id = | |
c13c4153 WW |
725 | cpu_to_le32(VIRTIO_BALLOON_CMD_ID_DONE); |
726 | } | |
727 | ||
6adfdc5a | 728 | trace_virtio_balloon_get_config(config.num_pages, config.actual); |
2bbadb08 | 729 | memcpy(config_data, &config, virtio_balloon_config_size(dev)); |
bd322087 AL |
730 | } |
731 | ||
39de9984 VSO |
732 | static ram_addr_t get_current_ram_size(void) |
733 | { | |
e919402b Y |
734 | MachineState *machine = MACHINE(qdev_get_machine()); |
735 | if (machine->device_memory) { | |
736 | return machine->ram_size + machine->device_memory->dimm_size; | |
737 | } else { | |
738 | return machine->ram_size; | |
39de9984 | 739 | } |
39de9984 VSO |
740 | } |
741 | ||
7483cbba AD |
742 | static bool virtio_balloon_page_poison_support(void *opaque) |
743 | { | |
744 | VirtIOBalloon *s = opaque; | |
745 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
746 | ||
747 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON); | |
748 | } | |
749 | ||
bd322087 AL |
750 | static void virtio_balloon_set_config(VirtIODevice *vdev, |
751 | const uint8_t *config_data) | |
752 | { | |
c96caced | 753 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
bd322087 | 754 | struct virtio_balloon_config config; |
973603a8 | 755 | uint32_t oldactual = dev->actual; |
463756d0 HZ |
756 | ram_addr_t vm_ram_size = get_current_ram_size(); |
757 | ||
2bbadb08 | 758 | memcpy(&config, config_data, virtio_balloon_config_size(dev)); |
e54f1771 | 759 | dev->actual = le32_to_cpu(config.actual); |
973603a8 | 760 | if (dev->actual != oldactual) { |
463756d0 | 761 | qapi_event_send_balloon_change(vm_ram_size - |
3ab72385 | 762 | ((ram_addr_t) dev->actual << VIRTIO_BALLOON_PFN_SHIFT)); |
973603a8 | 763 | } |
7483cbba AD |
764 | dev->poison_val = 0; |
765 | if (virtio_balloon_page_poison_support(dev)) { | |
766 | dev->poison_val = le32_to_cpu(config.poison_val); | |
767 | } | |
6adfdc5a | 768 | trace_virtio_balloon_set_config(dev->actual, oldactual); |
bd322087 AL |
769 | } |
770 | ||
9d5b731d JW |
771 | static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f, |
772 | Error **errp) | |
bd322087 | 773 | { |
e3816255 DL |
774 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
775 | f |= dev->host_features; | |
40de55af | 776 | virtio_add_feature(&f, VIRTIO_BALLOON_F_STATS_VQ); |
c13c4153 | 777 | |
8172539d | 778 | return f; |
bd322087 AL |
779 | } |
780 | ||
96637bcd | 781 | static void virtio_balloon_stat(void *opaque, BalloonInfo *info) |
dce911c7 AS |
782 | { |
783 | VirtIOBalloon *dev = opaque; | |
463756d0 HZ |
784 | info->actual = get_current_ram_size() - ((uint64_t) dev->actual << |
785 | VIRTIO_BALLOON_PFN_SHIFT); | |
dce911c7 AS |
786 | } |
787 | ||
30fb2ca6 | 788 | static void virtio_balloon_to_target(void *opaque, ram_addr_t target) |
bd322087 | 789 | { |
c96caced FK |
790 | VirtIOBalloon *dev = VIRTIO_BALLOON(opaque); |
791 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
463756d0 | 792 | ram_addr_t vm_ram_size = get_current_ram_size(); |
bd322087 | 793 | |
463756d0 HZ |
794 | if (target > vm_ram_size) { |
795 | target = vm_ram_size; | |
dce911c7 | 796 | } |
bd322087 | 797 | if (target) { |
463756d0 | 798 | dev->num_pages = (vm_ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT; |
c96caced | 799 | virtio_notify_config(vdev); |
bd322087 | 800 | } |
6adfdc5a | 801 | trace_virtio_balloon_to_target(target, dev->num_pages); |
bd322087 AL |
802 | } |
803 | ||
019518a8 | 804 | static int virtio_balloon_post_load_device(void *opaque, int version_id) |
9ea2511c | 805 | { |
019518a8 | 806 | VirtIOBalloon *s = VIRTIO_BALLOON(opaque); |
fecb48f7 PB |
807 | |
808 | if (balloon_stats_enabled(s)) { | |
809 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
810 | } | |
bd322087 AL |
811 | return 0; |
812 | } | |
813 | ||
3219b42f | 814 | static const VMStateDescription vmstate_virtio_balloon_free_page_hint = { |
c13c4153 WW |
815 | .name = "virtio-balloon-device/free-page-report", |
816 | .version_id = 1, | |
817 | .minimum_version_id = 1, | |
818 | .needed = virtio_balloon_free_page_support, | |
ca02a170 | 819 | .fields = (const VMStateField[]) { |
3219b42f AD |
820 | VMSTATE_UINT32(free_page_hint_cmd_id, VirtIOBalloon), |
821 | VMSTATE_UINT32(free_page_hint_status, VirtIOBalloon), | |
c13c4153 WW |
822 | VMSTATE_END_OF_LIST() |
823 | } | |
824 | }; | |
825 | ||
7483cbba | 826 | static const VMStateDescription vmstate_virtio_balloon_page_poison = { |
243a9284 | 827 | .name = "virtio-balloon-device/page-poison", |
7483cbba AD |
828 | .version_id = 1, |
829 | .minimum_version_id = 1, | |
830 | .needed = virtio_balloon_page_poison_support, | |
ca02a170 | 831 | .fields = (const VMStateField[]) { |
7483cbba AD |
832 | VMSTATE_UINT32(poison_val, VirtIOBalloon), |
833 | VMSTATE_END_OF_LIST() | |
834 | } | |
835 | }; | |
836 | ||
019518a8 DDAG |
837 | static const VMStateDescription vmstate_virtio_balloon_device = { |
838 | .name = "virtio-balloon-device", | |
839 | .version_id = 1, | |
840 | .minimum_version_id = 1, | |
841 | .post_load = virtio_balloon_post_load_device, | |
ca02a170 | 842 | .fields = (const VMStateField[]) { |
019518a8 DDAG |
843 | VMSTATE_UINT32(num_pages, VirtIOBalloon), |
844 | VMSTATE_UINT32(actual, VirtIOBalloon), | |
845 | VMSTATE_END_OF_LIST() | |
846 | }, | |
ca02a170 | 847 | .subsections = (const VMStateDescription * const []) { |
3219b42f | 848 | &vmstate_virtio_balloon_free_page_hint, |
7483cbba | 849 | &vmstate_virtio_balloon_page_poison, |
c13c4153 WW |
850 | NULL |
851 | } | |
019518a8 DDAG |
852 | }; |
853 | ||
74def47c | 854 | static void virtio_balloon_device_realize(DeviceState *dev, Error **errp) |
bd322087 | 855 | { |
74def47c | 856 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
a546fb17 | 857 | VirtIOBalloon *s = VIRTIO_BALLOON(dev); |
f76f6655 | 858 | int ret; |
bd322087 | 859 | |
3857cd5c | 860 | virtio_init(vdev, VIRTIO_ID_BALLOON, virtio_balloon_config_size(s)); |
bd322087 | 861 | |
f76f6655 AS |
862 | ret = qemu_add_balloon_handler(virtio_balloon_to_target, |
863 | virtio_balloon_stat, s); | |
5c7d0962 | 864 | |
1ab461b5 | 865 | if (ret < 0) { |
46abb812 | 866 | error_setg(errp, "Only one balloon device is supported"); |
a546fb17 | 867 | virtio_cleanup(vdev); |
74def47c | 868 | return; |
1ab461b5 | 869 | } |
f76f6655 | 870 | |
12fc8903 DH |
871 | if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_FREE_PAGE_HINT) && |
872 | !s->iothread) { | |
873 | error_setg(errp, "'free-page-hint' requires 'iothread' to be set"); | |
874 | virtio_cleanup(vdev); | |
875 | return; | |
876 | } | |
877 | ||
5c7d0962 FK |
878 | s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); |
879 | s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); | |
880 | s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats); | |
bd322087 | 881 | |
2d050ed0 | 882 | if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { |
c13c4153 WW |
883 | s->free_page_vq = virtio_add_queue(vdev, VIRTQUEUE_MAX_SIZE, |
884 | virtio_balloon_handle_free_page_vq); | |
3219b42f | 885 | precopy_add_notifier(&s->free_page_hint_notify); |
12fc8903 DH |
886 | |
887 | object_ref(OBJECT(s->iothread)); | |
f63192b0 AB |
888 | s->free_page_bh = aio_bh_new_guarded(iothread_get_aio_context(s->iothread), |
889 | virtio_ballloon_get_free_page_hints, s, | |
890 | &dev->mem_reentrancy_guard); | |
c13c4153 | 891 | } |
91b86719 AD |
892 | |
893 | if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_REPORTING)) { | |
894 | s->reporting_vq = virtio_add_queue(vdev, 32, | |
895 | virtio_balloon_handle_report); | |
896 | } | |
897 | ||
38dbd48b | 898 | reset_stats(s); |
1ab461b5 FK |
899 | } |
900 | ||
b69c3c21 | 901 | static void virtio_balloon_device_unrealize(DeviceState *dev) |
1ab461b5 | 902 | { |
306ec6c3 AF |
903 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
904 | VirtIOBalloon *s = VIRTIO_BALLOON(dev); | |
1ab461b5 | 905 | |
49b01711 | 906 | if (s->free_page_bh) { |
c13c4153 | 907 | qemu_bh_delete(s->free_page_bh); |
105aef9c | 908 | object_unref(OBJECT(s->iothread)); |
c13c4153 | 909 | virtio_balloon_free_page_stop(s); |
3219b42f | 910 | precopy_remove_notifier(&s->free_page_hint_notify); |
c13c4153 | 911 | } |
1ab461b5 FK |
912 | balloon_stats_destroy_timer(s); |
913 | qemu_remove_balloon_handler(s); | |
36278428 PN |
914 | |
915 | virtio_delete_queue(s->ivq); | |
916 | virtio_delete_queue(s->dvq); | |
917 | virtio_delete_queue(s->svq); | |
918 | if (s->free_page_vq) { | |
919 | virtio_delete_queue(s->free_page_vq); | |
920 | } | |
91b86719 AD |
921 | if (s->reporting_vq) { |
922 | virtio_delete_queue(s->reporting_vq); | |
923 | } | |
6a1a8cc7 | 924 | virtio_cleanup(vdev); |
1ab461b5 FK |
925 | } |
926 | ||
4eae2a65 LP |
927 | static void virtio_balloon_device_reset(VirtIODevice *vdev) |
928 | { | |
929 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
930 | ||
c13c4153 WW |
931 | if (virtio_balloon_free_page_support(s)) { |
932 | virtio_balloon_free_page_stop(s); | |
933 | } | |
934 | ||
4eae2a65 | 935 | if (s->stats_vq_elem != NULL) { |
27e57efe | 936 | virtqueue_unpop(s->svq, s->stats_vq_elem, 0); |
4eae2a65 LP |
937 | g_free(s->stats_vq_elem); |
938 | s->stats_vq_elem = NULL; | |
939 | } | |
7483cbba AD |
940 | |
941 | s->poison_val = 0; | |
4eae2a65 LP |
942 | } |
943 | ||
4a1e48be LP |
944 | static void virtio_balloon_set_status(VirtIODevice *vdev, uint8_t status) |
945 | { | |
946 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
947 | ||
948 | if (!s->stats_vq_elem && vdev->vm_running && | |
949 | (status & VIRTIO_CONFIG_S_DRIVER_OK) && virtqueue_rewind(s->svq, 1)) { | |
950 | /* poll stats queue for the element we have discarded when the VM | |
951 | * was stopped */ | |
952 | virtio_balloon_receive_stats(vdev, s->svq); | |
953 | } | |
c13c4153 WW |
954 | |
955 | if (virtio_balloon_free_page_support(s)) { | |
956 | /* | |
957 | * The VM is woken up and the iothread was blocked, so signal it to | |
958 | * continue. | |
959 | */ | |
960 | if (vdev->vm_running && s->block_iothread) { | |
961 | qemu_mutex_lock(&s->free_page_lock); | |
962 | s->block_iothread = false; | |
963 | qemu_cond_signal(&s->free_page_cond); | |
964 | qemu_mutex_unlock(&s->free_page_lock); | |
965 | } | |
966 | ||
967 | /* The VM is stopped, block the iothread. */ | |
968 | if (!vdev->vm_running) { | |
969 | qemu_mutex_lock(&s->free_page_lock); | |
970 | s->block_iothread = true; | |
971 | qemu_mutex_unlock(&s->free_page_lock); | |
972 | } | |
973 | } | |
4a1e48be LP |
974 | } |
975 | ||
1190044e SZ |
976 | static void virtio_balloon_instance_init(Object *obj) |
977 | { | |
978 | VirtIOBalloon *s = VIRTIO_BALLOON(obj); | |
979 | ||
12fc8903 DH |
980 | qemu_mutex_init(&s->free_page_lock); |
981 | qemu_cond_init(&s->free_page_cond); | |
3219b42f AD |
982 | s->free_page_hint_cmd_id = VIRTIO_BALLOON_FREE_PAGE_HINT_CMD_ID_MIN; |
983 | s->free_page_hint_notify.notify = virtio_balloon_free_page_hint_notify; | |
12fc8903 | 984 | |
1190044e | 985 | object_property_add(obj, "guest-stats", "guest statistics", |
a2d860bb | 986 | balloon_stats_get_all, NULL, NULL, NULL); |
1190044e SZ |
987 | |
988 | object_property_add(obj, "guest-stats-polling-interval", "int", | |
989 | balloon_stats_get_poll_interval, | |
990 | balloon_stats_set_poll_interval, | |
a2d860bb | 991 | NULL, NULL); |
1190044e SZ |
992 | } |
993 | ||
c5dc16b7 HP |
994 | static const VMStateDescription vmstate_virtio_balloon = { |
995 | .name = "virtio-balloon", | |
996 | .minimum_version_id = 1, | |
997 | .version_id = 1, | |
ca02a170 | 998 | .fields = (const VMStateField[]) { |
c5dc16b7 HP |
999 | VMSTATE_VIRTIO_DEVICE, |
1000 | VMSTATE_END_OF_LIST() | |
1001 | }, | |
1002 | }; | |
7f1ca9b2 | 1003 | |
1ab461b5 | 1004 | static Property virtio_balloon_properties[] = { |
e3816255 DL |
1005 | DEFINE_PROP_BIT("deflate-on-oom", VirtIOBalloon, host_features, |
1006 | VIRTIO_BALLOON_F_DEFLATE_ON_OOM, false), | |
c13c4153 WW |
1007 | DEFINE_PROP_BIT("free-page-hint", VirtIOBalloon, host_features, |
1008 | VIRTIO_BALLOON_F_FREE_PAGE_HINT, false), | |
7483cbba AD |
1009 | DEFINE_PROP_BIT("page-poison", VirtIOBalloon, host_features, |
1010 | VIRTIO_BALLOON_F_PAGE_POISON, true), | |
91b86719 AD |
1011 | DEFINE_PROP_BIT("free-page-reporting", VirtIOBalloon, host_features, |
1012 | VIRTIO_BALLOON_F_REPORTING, false), | |
2bbadb08 SH |
1013 | /* QEMU 4.0 accidentally changed the config size even when free-page-hint |
1014 | * is disabled, resulting in QEMU 3.1 migration incompatibility. This | |
1015 | * property retains this quirk for QEMU 4.1 machine types. | |
1016 | */ | |
1017 | DEFINE_PROP_BOOL("qemu-4-0-config-size", VirtIOBalloon, | |
1018 | qemu_4_0_config_size, false), | |
c13c4153 WW |
1019 | DEFINE_PROP_LINK("iothread", VirtIOBalloon, iothread, TYPE_IOTHREAD, |
1020 | IOThread *), | |
1ab461b5 FK |
1021 | DEFINE_PROP_END_OF_LIST(), |
1022 | }; | |
1023 | ||
1024 | static void virtio_balloon_class_init(ObjectClass *klass, void *data) | |
1025 | { | |
1026 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1027 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
74def47c | 1028 | |
4f67d30b | 1029 | device_class_set_props(dc, virtio_balloon_properties); |
7f1ca9b2 | 1030 | dc->vmsd = &vmstate_virtio_balloon; |
125ee0ed | 1031 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
74def47c | 1032 | vdc->realize = virtio_balloon_device_realize; |
306ec6c3 | 1033 | vdc->unrealize = virtio_balloon_device_unrealize; |
4eae2a65 | 1034 | vdc->reset = virtio_balloon_device_reset; |
1ab461b5 FK |
1035 | vdc->get_config = virtio_balloon_get_config; |
1036 | vdc->set_config = virtio_balloon_set_config; | |
1037 | vdc->get_features = virtio_balloon_get_features; | |
4a1e48be | 1038 | vdc->set_status = virtio_balloon_set_status; |
019518a8 | 1039 | vdc->vmsd = &vmstate_virtio_balloon_device; |
1ab461b5 FK |
1040 | } |
1041 | ||
1042 | static const TypeInfo virtio_balloon_info = { | |
1043 | .name = TYPE_VIRTIO_BALLOON, | |
1044 | .parent = TYPE_VIRTIO_DEVICE, | |
1045 | .instance_size = sizeof(VirtIOBalloon), | |
1190044e | 1046 | .instance_init = virtio_balloon_instance_init, |
1ab461b5 FK |
1047 | .class_init = virtio_balloon_class_init, |
1048 | }; | |
1049 | ||
1050 | static void virtio_register_types(void) | |
1051 | { | |
1052 | type_register_static(&virtio_balloon_info); | |
1053 | } | |
1054 | ||
1055 | type_init(virtio_register_types) |