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Commit | Line | Data |
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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" |
0d09e41a | 20 | #include "hw/virtio/virtio.h" |
2070aaeb | 21 | #include "hw/mem/pc-dimm.h" |
a27bd6c7 | 22 | #include "hw/qdev-properties.h" |
9c17d615 | 23 | #include "sysemu/balloon.h" |
0d09e41a | 24 | #include "hw/virtio/virtio-balloon.h" |
022c62cb | 25 | #include "exec/address-spaces.h" |
e688df6b | 26 | #include "qapi/error.h" |
112ed241 | 27 | #include "qapi/qapi-events-misc.h" |
7e6ccd9c | 28 | #include "qapi/visitor.h" |
6adfdc5a | 29 | #include "trace.h" |
2ab4b135 | 30 | #include "qemu/error-report.h" |
c13c4153 | 31 | #include "migration/misc.h" |
bd322087 | 32 | |
0d09e41a | 33 | #include "hw/virtio/virtio-bus.h" |
8609d2a8 | 34 | #include "hw/virtio/virtio-access.h" |
1ab461b5 | 35 | |
01310e2a TH |
36 | #define BALLOON_PAGE_SIZE (1 << VIRTIO_BALLOON_PFN_SHIFT) |
37 | ||
a8cd64d4 | 38 | typedef struct PartiallyBalloonedPage { |
1c5cfc2b | 39 | ram_addr_t base_gpa; |
1c5cfc2b | 40 | unsigned long *bitmap; |
a8cd64d4 | 41 | } PartiallyBalloonedPage; |
ed48c598 | 42 | |
1c5cfc2b DH |
43 | static void virtio_balloon_pbp_free(PartiallyBalloonedPage *pbp) |
44 | { | |
1b47b37c | 45 | if (!pbp->bitmap) { |
1c5cfc2b DH |
46 | return; |
47 | } | |
48 | g_free(pbp->bitmap); | |
1b47b37c | 49 | pbp->bitmap = NULL; |
1c5cfc2b DH |
50 | } |
51 | ||
1b47b37c MT |
52 | static void virtio_balloon_pbp_alloc(PartiallyBalloonedPage *pbp, |
53 | ram_addr_t base_gpa, | |
54 | long subpages) | |
1c5cfc2b | 55 | { |
1c5cfc2b | 56 | pbp->base_gpa = base_gpa; |
1c5cfc2b | 57 | pbp->bitmap = bitmap_new(subpages); |
1c5cfc2b DH |
58 | } |
59 | ||
60 | static bool virtio_balloon_pbp_matches(PartiallyBalloonedPage *pbp, | |
9a7ca8a7 | 61 | ram_addr_t base_gpa) |
1c5cfc2b | 62 | { |
9a7ca8a7 | 63 | return pbp->base_gpa == base_gpa; |
1c5cfc2b DH |
64 | } |
65 | ||
06df2e69 DH |
66 | static bool virtio_balloon_inhibited(void) |
67 | { | |
68 | /* Postcopy cannot deal with concurrent discards, so it's special. */ | |
69 | return ram_block_discard_is_disabled() || migration_in_incoming_postcopy(); | |
70 | } | |
71 | ||
e9550234 | 72 | static void balloon_inflate_page(VirtIOBalloon *balloon, |
a8cd64d4 | 73 | MemoryRegion *mr, hwaddr mr_offset, |
1b47b37c | 74 | PartiallyBalloonedPage *pbp) |
bd322087 | 75 | { |
e6129b27 | 76 | void *addr = memory_region_get_ram_ptr(mr) + mr_offset; |
1c5cfc2b | 77 | ram_addr_t rb_offset, rb_aligned_offset, base_gpa; |
dbe1a277 DG |
78 | RAMBlock *rb; |
79 | size_t rb_page_size; | |
ed48c598 | 80 | int subpages; |
e9550234 | 81 | |
dbe1a277 DG |
82 | /* XXX is there a better way to get to the RAMBlock than via a |
83 | * host address? */ | |
e6129b27 | 84 | rb = qemu_ram_block_from_host(addr, false, &rb_offset); |
dbe1a277 | 85 | rb_page_size = qemu_ram_pagesize(rb); |
ed48c598 DG |
86 | |
87 | if (rb_page_size == BALLOON_PAGE_SIZE) { | |
88 | /* Easy case */ | |
dbe1a277 | 89 | |
e6129b27 | 90 | ram_block_discard_range(rb, rb_offset, rb_page_size); |
ed48c598 DG |
91 | /* We ignore errors from ram_block_discard_range(), because it |
92 | * has already reported them, and failing to discard a balloon | |
93 | * page is not fatal */ | |
dbe1a277 DG |
94 | return; |
95 | } | |
96 | ||
ed48c598 DG |
97 | /* Hard case |
98 | * | |
99 | * We've put a piece of a larger host page into the balloon - we | |
100 | * need to keep track until we have a whole host page to | |
101 | * discard | |
102 | */ | |
103 | warn_report_once( | |
104 | "Balloon used with backing page size > 4kiB, this may not be reliable"); | |
105 | ||
e6129b27 | 106 | rb_aligned_offset = QEMU_ALIGN_DOWN(rb_offset, rb_page_size); |
ed48c598 | 107 | subpages = rb_page_size / BALLOON_PAGE_SIZE; |
1c5cfc2b DH |
108 | base_gpa = memory_region_get_ram_addr(mr) + mr_offset - |
109 | (rb_offset - rb_aligned_offset); | |
ed48c598 | 110 | |
1b47b37c | 111 | if (pbp->bitmap && !virtio_balloon_pbp_matches(pbp, base_gpa)) { |
ed48c598 DG |
112 | /* We've partially ballooned part of a host page, but now |
113 | * we're trying to balloon part of a different one. Too hard, | |
114 | * give up on the old partial page */ | |
1b47b37c | 115 | virtio_balloon_pbp_free(pbp); |
dbe1a277 DG |
116 | } |
117 | ||
1b47b37c MT |
118 | if (!pbp->bitmap) { |
119 | virtio_balloon_pbp_alloc(pbp, base_gpa, subpages); | |
ed48c598 DG |
120 | } |
121 | ||
1c5cfc2b | 122 | set_bit((rb_offset - rb_aligned_offset) / BALLOON_PAGE_SIZE, |
1b47b37c | 123 | pbp->bitmap); |
ed48c598 | 124 | |
1b47b37c | 125 | if (bitmap_full(pbp->bitmap, subpages)) { |
ed48c598 DG |
126 | /* We've accumulated a full host page, we can actually discard |
127 | * it now */ | |
128 | ||
1c5cfc2b | 129 | ram_block_discard_range(rb, rb_aligned_offset, rb_page_size); |
ed48c598 DG |
130 | /* We ignore errors from ram_block_discard_range(), because it |
131 | * has already reported them, and failing to discard a balloon | |
132 | * page is not fatal */ | |
1b47b37c | 133 | virtio_balloon_pbp_free(pbp); |
ed48c598 | 134 | } |
bd322087 AL |
135 | } |
136 | ||
b27b3239 | 137 | static void balloon_deflate_page(VirtIOBalloon *balloon, |
e6129b27 | 138 | MemoryRegion *mr, hwaddr mr_offset) |
b27b3239 | 139 | { |
e6129b27 DH |
140 | void *addr = memory_region_get_ram_ptr(mr) + mr_offset; |
141 | ram_addr_t rb_offset; | |
b27b3239 DG |
142 | RAMBlock *rb; |
143 | size_t rb_page_size; | |
596546fe DG |
144 | void *host_addr; |
145 | int ret; | |
b27b3239 DG |
146 | |
147 | /* XXX is there a better way to get to the RAMBlock than via a | |
148 | * host address? */ | |
e6129b27 | 149 | rb = qemu_ram_block_from_host(addr, false, &rb_offset); |
b27b3239 | 150 | rb_page_size = qemu_ram_pagesize(rb); |
b27b3239 | 151 | |
596546fe DG |
152 | host_addr = (void *)((uintptr_t)addr & ~(rb_page_size - 1)); |
153 | ||
154 | /* When a page is deflated, we hint the whole host page it lives | |
155 | * on, since we can't do anything smaller */ | |
156 | ret = qemu_madvise(host_addr, rb_page_size, QEMU_MADV_WILLNEED); | |
157 | if (ret != 0) { | |
158 | warn_report("Couldn't MADV_WILLNEED on balloon deflate: %s", | |
159 | strerror(errno)); | |
160 | /* Otherwise ignore, failing to page hint shouldn't be fatal */ | |
161 | } | |
b27b3239 DG |
162 | } |
163 | ||
7e6ccd9c LC |
164 | static const char *balloon_stat_names[] = { |
165 | [VIRTIO_BALLOON_S_SWAP_IN] = "stat-swap-in", | |
166 | [VIRTIO_BALLOON_S_SWAP_OUT] = "stat-swap-out", | |
167 | [VIRTIO_BALLOON_S_MAJFLT] = "stat-major-faults", | |
168 | [VIRTIO_BALLOON_S_MINFLT] = "stat-minor-faults", | |
169 | [VIRTIO_BALLOON_S_MEMFREE] = "stat-free-memory", | |
170 | [VIRTIO_BALLOON_S_MEMTOT] = "stat-total-memory", | |
a0d06486 | 171 | [VIRTIO_BALLOON_S_AVAIL] = "stat-available-memory", |
bf1e7140 | 172 | [VIRTIO_BALLOON_S_CACHES] = "stat-disk-caches", |
b7b12644 JH |
173 | [VIRTIO_BALLOON_S_HTLB_PGALLOC] = "stat-htlb-pgalloc", |
174 | [VIRTIO_BALLOON_S_HTLB_PGFAIL] = "stat-htlb-pgfail", | |
7e6ccd9c LC |
175 | [VIRTIO_BALLOON_S_NR] = NULL |
176 | }; | |
177 | ||
625a5bef AL |
178 | /* |
179 | * reset_stats - Mark all items in the stats array as unset | |
180 | * | |
52f35022 SW |
181 | * This function needs to be called at device initialization and before |
182 | * updating to a set of newly-generated stats. This will ensure that no | |
625a5bef AL |
183 | * stale values stick around in case the guest reports a subset of the supported |
184 | * statistics. | |
185 | */ | |
186 | static inline void reset_stats(VirtIOBalloon *dev) | |
187 | { | |
188 | int i; | |
189 | for (i = 0; i < VIRTIO_BALLOON_S_NR; dev->stats[i++] = -1); | |
190 | } | |
191 | ||
7e6ccd9c LC |
192 | static bool balloon_stats_supported(const VirtIOBalloon *s) |
193 | { | |
c96caced | 194 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
95129d6f | 195 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_STATS_VQ); |
7e6ccd9c LC |
196 | } |
197 | ||
198 | static bool balloon_stats_enabled(const VirtIOBalloon *s) | |
199 | { | |
200 | return s->stats_poll_interval > 0; | |
201 | } | |
202 | ||
203 | static void balloon_stats_destroy_timer(VirtIOBalloon *s) | |
204 | { | |
205 | if (balloon_stats_enabled(s)) { | |
bc72ad67 AB |
206 | timer_del(s->stats_timer); |
207 | timer_free(s->stats_timer); | |
7e6ccd9c LC |
208 | s->stats_timer = NULL; |
209 | s->stats_poll_interval = 0; | |
210 | } | |
211 | } | |
212 | ||
1f9296b5 | 213 | static void balloon_stats_change_timer(VirtIOBalloon *s, int64_t secs) |
7e6ccd9c | 214 | { |
bc72ad67 | 215 | timer_mod(s->stats_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + secs * 1000); |
7e6ccd9c LC |
216 | } |
217 | ||
218 | static void balloon_stats_poll_cb(void *opaque) | |
219 | { | |
220 | VirtIOBalloon *s = opaque; | |
c96caced | 221 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
7e6ccd9c | 222 | |
4eae2a65 | 223 | if (s->stats_vq_elem == NULL || !balloon_stats_supported(s)) { |
7e6ccd9c LC |
224 | /* re-schedule */ |
225 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
226 | return; | |
227 | } | |
228 | ||
51b19ebe | 229 | virtqueue_push(s->svq, s->stats_vq_elem, s->stats_vq_offset); |
c96caced | 230 | virtio_notify(vdev, s->svq); |
51b19ebe PB |
231 | g_free(s->stats_vq_elem); |
232 | s->stats_vq_elem = NULL; | |
7e6ccd9c LC |
233 | } |
234 | ||
d7bce999 EB |
235 | static void balloon_stats_get_all(Object *obj, Visitor *v, const char *name, |
236 | void *opaque, Error **errp) | |
7e6ccd9c | 237 | { |
2ddb16a9 | 238 | Error *err = NULL; |
7e6ccd9c LC |
239 | VirtIOBalloon *s = opaque; |
240 | int i; | |
241 | ||
62a35aaa | 242 | if (!visit_start_struct(v, name, NULL, 0, &err)) { |
2ddb16a9 MA |
243 | goto out; |
244 | } | |
62a35aaa | 245 | if (!visit_type_int(v, "last-update", &s->stats_last_update, &err)) { |
297a3646 MA |
246 | goto out_end; |
247 | } | |
7e6ccd9c | 248 | |
62a35aaa | 249 | if (!visit_start_struct(v, "stats", NULL, 0, &err)) { |
2ddb16a9 MA |
250 | goto out_end; |
251 | } | |
9dbb8fa7 | 252 | for (i = 0; i < VIRTIO_BALLOON_S_NR; i++) { |
62a35aaa | 253 | if (!visit_type_uint64(v, balloon_stat_names[i], &s->stats[i], &err)) { |
15c2f669 | 254 | goto out_nested; |
9dbb8fa7 | 255 | } |
7e6ccd9c | 256 | } |
15c2f669 EB |
257 | visit_check_struct(v, &err); |
258 | out_nested: | |
1158bb2a | 259 | visit_end_struct(v, NULL); |
2ddb16a9 | 260 | |
15c2f669 EB |
261 | if (!err) { |
262 | visit_check_struct(v, &err); | |
263 | } | |
2ddb16a9 | 264 | out_end: |
1158bb2a | 265 | visit_end_struct(v, NULL); |
2ddb16a9 MA |
266 | out: |
267 | error_propagate(errp, err); | |
7e6ccd9c LC |
268 | } |
269 | ||
4fa45492 | 270 | static void balloon_stats_get_poll_interval(Object *obj, Visitor *v, |
d7bce999 | 271 | const char *name, void *opaque, |
7e6ccd9c LC |
272 | Error **errp) |
273 | { | |
274 | VirtIOBalloon *s = opaque; | |
51e72bc1 | 275 | visit_type_int(v, name, &s->stats_poll_interval, errp); |
7e6ccd9c LC |
276 | } |
277 | ||
4fa45492 | 278 | static void balloon_stats_set_poll_interval(Object *obj, Visitor *v, |
d7bce999 | 279 | const char *name, void *opaque, |
7e6ccd9c LC |
280 | Error **errp) |
281 | { | |
282 | VirtIOBalloon *s = opaque; | |
283 | int64_t value; | |
284 | ||
668f62ec | 285 | if (!visit_type_int(v, name, &value, errp)) { |
7e6ccd9c LC |
286 | return; |
287 | } | |
288 | ||
289 | if (value < 0) { | |
290 | error_setg(errp, "timer value must be greater than zero"); | |
291 | return; | |
292 | } | |
293 | ||
22644cd2 | 294 | if (value > UINT32_MAX) { |
1f9296b5 LC |
295 | error_setg(errp, "timer value is too big"); |
296 | return; | |
297 | } | |
298 | ||
7e6ccd9c LC |
299 | if (value == s->stats_poll_interval) { |
300 | return; | |
301 | } | |
302 | ||
303 | if (value == 0) { | |
304 | /* timer=0 disables the timer */ | |
305 | balloon_stats_destroy_timer(s); | |
306 | return; | |
307 | } | |
308 | ||
309 | if (balloon_stats_enabled(s)) { | |
310 | /* timer interval change */ | |
311 | s->stats_poll_interval = value; | |
312 | balloon_stats_change_timer(s, value); | |
313 | return; | |
314 | } | |
315 | ||
316 | /* create a new timer */ | |
317 | g_assert(s->stats_timer == NULL); | |
bc72ad67 | 318 | s->stats_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, balloon_stats_poll_cb, s); |
7e6ccd9c LC |
319 | s->stats_poll_interval = value; |
320 | balloon_stats_change_timer(s, 0); | |
321 | } | |
322 | ||
91b86719 AD |
323 | static void virtio_balloon_handle_report(VirtIODevice *vdev, VirtQueue *vq) |
324 | { | |
325 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); | |
326 | VirtQueueElement *elem; | |
327 | ||
328 | while ((elem = virtqueue_pop(vq, sizeof(VirtQueueElement)))) { | |
329 | unsigned int i; | |
330 | ||
331 | /* | |
332 | * When we discard the page it has the effect of removing the page | |
333 | * from the hypervisor itself and causing it to be zeroed when it | |
334 | * is returned to us. So we must not discard the page if it is | |
335 | * accessible by another device or process, or if the guest is | |
336 | * expecting it to retain a non-zero value. | |
337 | */ | |
06df2e69 | 338 | if (virtio_balloon_inhibited() || dev->poison_val) { |
91b86719 AD |
339 | goto skip_element; |
340 | } | |
341 | ||
342 | for (i = 0; i < elem->in_num; i++) { | |
343 | void *addr = elem->in_sg[i].iov_base; | |
344 | size_t size = elem->in_sg[i].iov_len; | |
345 | ram_addr_t ram_offset; | |
346 | RAMBlock *rb; | |
347 | ||
348 | /* | |
349 | * There is no need to check the memory section to see if | |
350 | * it is ram/readonly/romd like there is for handle_output | |
351 | * below. If the region is not meant to be written to then | |
352 | * address_space_map will have allocated a bounce buffer | |
353 | * and it will be freed in address_space_unmap and trigger | |
354 | * and unassigned_mem_write before failing to copy over the | |
355 | * buffer. If more than one bad descriptor is provided it | |
356 | * will return NULL after the first bounce buffer and fail | |
357 | * to map any resources. | |
358 | */ | |
359 | rb = qemu_ram_block_from_host(addr, false, &ram_offset); | |
360 | if (!rb) { | |
361 | trace_virtio_balloon_bad_addr(elem->in_addr[i]); | |
362 | continue; | |
363 | } | |
364 | ||
365 | /* | |
366 | * For now we will simply ignore unaligned memory regions, or | |
367 | * regions that overrun the end of the RAMBlock. | |
368 | */ | |
369 | if (!QEMU_IS_ALIGNED(ram_offset | size, qemu_ram_pagesize(rb)) || | |
370 | (ram_offset + size) > qemu_ram_get_used_length(rb)) { | |
371 | continue; | |
372 | } | |
373 | ||
374 | ram_block_discard_range(rb, ram_offset, size); | |
375 | } | |
376 | ||
377 | skip_element: | |
378 | virtqueue_push(vq, elem, 0); | |
379 | virtio_notify(vdev, vq); | |
380 | g_free(elem); | |
381 | } | |
382 | } | |
383 | ||
bd322087 AL |
384 | static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
385 | { | |
c96caced | 386 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); |
51b19ebe | 387 | VirtQueueElement *elem; |
b7c28c74 | 388 | MemoryRegionSection section; |
bd322087 | 389 | |
51b19ebe | 390 | for (;;) { |
1b47b37c | 391 | PartiallyBalloonedPage pbp = {}; |
bd322087 AL |
392 | size_t offset = 0; |
393 | uint32_t pfn; | |
1b47b37c | 394 | |
51b19ebe PB |
395 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
396 | if (!elem) { | |
a8cd64d4 | 397 | break; |
51b19ebe | 398 | } |
bd322087 | 399 | |
51b19ebe | 400 | while (iov_to_buf(elem->out_sg, elem->out_num, offset, &pfn, 4) == 4) { |
ffa207d0 | 401 | unsigned int p = virtio_ldl_p(vdev, &pfn); |
b218a70e | 402 | hwaddr pa; |
bd322087 | 403 | |
b218a70e | 404 | pa = (hwaddr) p << VIRTIO_BALLOON_PFN_SHIFT; |
bd322087 AL |
405 | offset += 4; |
406 | ||
b218a70e DG |
407 | section = memory_region_find(get_system_memory(), pa, |
408 | BALLOON_PAGE_SIZE); | |
409 | if (!section.mr) { | |
410 | trace_virtio_balloon_bad_addr(pa); | |
411 | continue; | |
412 | } | |
413 | if (!memory_region_is_ram(section.mr) || | |
f2fd57db DDAG |
414 | memory_region_is_rom(section.mr) || |
415 | memory_region_is_romd(section.mr)) { | |
416 | trace_virtio_balloon_bad_addr(pa); | |
b86107ab | 417 | memory_region_unref(section.mr); |
bd322087 | 418 | continue; |
f2fd57db | 419 | } |
bd322087 | 420 | |
6adfdc5a HZ |
421 | trace_virtio_balloon_handle_output(memory_region_name(section.mr), |
422 | pa); | |
06df2e69 | 423 | if (!virtio_balloon_inhibited()) { |
b27b3239 DG |
424 | if (vq == s->ivq) { |
425 | balloon_inflate_page(s, section.mr, | |
a8cd64d4 | 426 | section.offset_within_region, &pbp); |
b27b3239 DG |
427 | } else if (vq == s->dvq) { |
428 | balloon_deflate_page(s, section.mr, section.offset_within_region); | |
429 | } else { | |
430 | g_assert_not_reached(); | |
431 | } | |
e9550234 | 432 | } |
dfde4e6e | 433 | memory_region_unref(section.mr); |
bd322087 AL |
434 | } |
435 | ||
51b19ebe | 436 | virtqueue_push(vq, elem, offset); |
bd322087 | 437 | virtio_notify(vdev, vq); |
51b19ebe | 438 | g_free(elem); |
1b47b37c | 439 | virtio_balloon_pbp_free(&pbp); |
bd322087 AL |
440 | } |
441 | } | |
442 | ||
625a5bef AL |
443 | static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq) |
444 | { | |
c96caced | 445 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); |
51b19ebe | 446 | VirtQueueElement *elem; |
625a5bef AL |
447 | VirtIOBalloonStat stat; |
448 | size_t offset = 0; | |
7e6ccd9c | 449 | qemu_timeval tv; |
625a5bef | 450 | |
4eae2a65 | 451 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
51b19ebe | 452 | if (!elem) { |
7e6ccd9c | 453 | goto out; |
625a5bef AL |
454 | } |
455 | ||
4eae2a65 LP |
456 | if (s->stats_vq_elem != NULL) { |
457 | /* This should never happen if the driver follows the spec. */ | |
458 | virtqueue_push(vq, s->stats_vq_elem, 0); | |
459 | virtio_notify(vdev, vq); | |
460 | g_free(s->stats_vq_elem); | |
461 | } | |
462 | ||
463 | s->stats_vq_elem = elem; | |
464 | ||
625a5bef AL |
465 | /* Initialize the stats to get rid of any stale values. This is only |
466 | * needed to handle the case where a guest supports fewer stats than it | |
467 | * used to (ie. it has booted into an old kernel). | |
468 | */ | |
469 | reset_stats(s); | |
470 | ||
dcf6f5e1 | 471 | while (iov_to_buf(elem->out_sg, elem->out_num, offset, &stat, sizeof(stat)) |
fa6111f2 | 472 | == sizeof(stat)) { |
8609d2a8 RR |
473 | uint16_t tag = virtio_tswap16(vdev, stat.tag); |
474 | uint64_t val = virtio_tswap64(vdev, stat.val); | |
625a5bef AL |
475 | |
476 | offset += sizeof(stat); | |
477 | if (tag < VIRTIO_BALLOON_S_NR) | |
478 | s->stats[tag] = val; | |
479 | } | |
480 | s->stats_vq_offset = offset; | |
7e6ccd9c LC |
481 | |
482 | if (qemu_gettimeofday(&tv) < 0) { | |
2ab4b135 | 483 | warn_report("%s: failed to get time of day", __func__); |
7e6ccd9c LC |
484 | goto out; |
485 | } | |
486 | ||
487 | s->stats_last_update = tv.tv_sec; | |
488 | ||
489 | out: | |
490 | if (balloon_stats_enabled(s)) { | |
491 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
492 | } | |
625a5bef AL |
493 | } |
494 | ||
c13c4153 WW |
495 | static void virtio_balloon_handle_free_page_vq(VirtIODevice *vdev, |
496 | VirtQueue *vq) | |
497 | { | |
498 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
499 | qemu_bh_schedule(s->free_page_bh); | |
500 | } | |
501 | ||
502 | static bool get_free_page_hints(VirtIOBalloon *dev) | |
503 | { | |
504 | VirtQueueElement *elem; | |
505 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
506 | VirtQueue *vq = dev->free_page_vq; | |
ae440bd1 | 507 | bool ret = true; |
c13c4153 WW |
508 | |
509 | while (dev->block_iothread) { | |
510 | qemu_cond_wait(&dev->free_page_cond, &dev->free_page_lock); | |
511 | } | |
512 | ||
513 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); | |
514 | if (!elem) { | |
515 | return false; | |
516 | } | |
517 | ||
518 | if (elem->out_num) { | |
519 | uint32_t id; | |
520 | size_t size = iov_to_buf(elem->out_sg, elem->out_num, 0, | |
521 | &id, sizeof(id)); | |
c13c4153 WW |
522 | |
523 | virtio_tswap32s(vdev, &id); | |
524 | if (unlikely(size != sizeof(id))) { | |
525 | virtio_error(vdev, "received an incorrect cmd id"); | |
ae440bd1 WW |
526 | ret = false; |
527 | goto out; | |
c13c4153 WW |
528 | } |
529 | if (id == dev->free_page_report_cmd_id) { | |
530 | dev->free_page_report_status = FREE_PAGE_REPORT_S_START; | |
531 | } else { | |
532 | /* | |
533 | * Stop the optimization only when it has started. This | |
534 | * avoids a stale stop sign for the previous command. | |
535 | */ | |
536 | if (dev->free_page_report_status == FREE_PAGE_REPORT_S_START) { | |
537 | dev->free_page_report_status = FREE_PAGE_REPORT_S_STOP; | |
538 | } | |
539 | } | |
540 | } | |
541 | ||
542 | if (elem->in_num) { | |
543 | if (dev->free_page_report_status == FREE_PAGE_REPORT_S_START) { | |
544 | qemu_guest_free_page_hint(elem->in_sg[0].iov_base, | |
545 | elem->in_sg[0].iov_len); | |
546 | } | |
c13c4153 WW |
547 | } |
548 | ||
ae440bd1 WW |
549 | out: |
550 | virtqueue_push(vq, elem, 1); | |
551 | g_free(elem); | |
552 | return ret; | |
c13c4153 WW |
553 | } |
554 | ||
555 | static void virtio_ballloon_get_free_page_hints(void *opaque) | |
556 | { | |
557 | VirtIOBalloon *dev = opaque; | |
558 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
559 | VirtQueue *vq = dev->free_page_vq; | |
560 | bool continue_to_get_hints; | |
561 | ||
562 | do { | |
563 | qemu_mutex_lock(&dev->free_page_lock); | |
564 | virtio_queue_set_notification(vq, 0); | |
565 | continue_to_get_hints = get_free_page_hints(dev); | |
566 | qemu_mutex_unlock(&dev->free_page_lock); | |
567 | virtio_notify(vdev, vq); | |
568 | /* | |
569 | * Start to poll the vq once the reporting started. Otherwise, continue | |
570 | * only when there are entries on the vq, which need to be given back. | |
571 | */ | |
572 | } while (continue_to_get_hints || | |
573 | dev->free_page_report_status == FREE_PAGE_REPORT_S_START); | |
574 | virtio_queue_set_notification(vq, 1); | |
575 | } | |
576 | ||
577 | static bool virtio_balloon_free_page_support(void *opaque) | |
578 | { | |
579 | VirtIOBalloon *s = opaque; | |
580 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
581 | ||
582 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_FREE_PAGE_HINT); | |
583 | } | |
584 | ||
585 | static void virtio_balloon_free_page_start(VirtIOBalloon *s) | |
586 | { | |
587 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
588 | ||
589 | /* For the stop and copy phase, we don't need to start the optimization */ | |
590 | if (!vdev->vm_running) { | |
591 | return; | |
592 | } | |
593 | ||
594 | if (s->free_page_report_cmd_id == UINT_MAX) { | |
595 | s->free_page_report_cmd_id = | |
596 | VIRTIO_BALLOON_FREE_PAGE_REPORT_CMD_ID_MIN; | |
597 | } else { | |
598 | s->free_page_report_cmd_id++; | |
599 | } | |
600 | ||
601 | s->free_page_report_status = FREE_PAGE_REPORT_S_REQUESTED; | |
602 | virtio_notify_config(vdev); | |
603 | } | |
604 | ||
605 | static void virtio_balloon_free_page_stop(VirtIOBalloon *s) | |
606 | { | |
607 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
608 | ||
609 | if (s->free_page_report_status != FREE_PAGE_REPORT_S_STOP) { | |
610 | /* | |
611 | * The lock also guarantees us that the | |
612 | * virtio_ballloon_get_free_page_hints exits after the | |
613 | * free_page_report_status is set to S_STOP. | |
614 | */ | |
615 | qemu_mutex_lock(&s->free_page_lock); | |
616 | /* | |
617 | * The guest hasn't done the reporting, so host sends a notification | |
618 | * to the guest to actively stop the reporting. | |
619 | */ | |
620 | s->free_page_report_status = FREE_PAGE_REPORT_S_STOP; | |
621 | qemu_mutex_unlock(&s->free_page_lock); | |
622 | virtio_notify_config(vdev); | |
623 | } | |
624 | } | |
625 | ||
626 | static void virtio_balloon_free_page_done(VirtIOBalloon *s) | |
627 | { | |
628 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
629 | ||
dd8eeb96 DH |
630 | if (s->free_page_report_status != FREE_PAGE_REPORT_S_DONE) { |
631 | /* See virtio_balloon_free_page_stop() */ | |
632 | qemu_mutex_lock(&s->free_page_lock); | |
633 | s->free_page_report_status = FREE_PAGE_REPORT_S_DONE; | |
634 | qemu_mutex_unlock(&s->free_page_lock); | |
635 | virtio_notify_config(vdev); | |
636 | } | |
c13c4153 WW |
637 | } |
638 | ||
639 | static int | |
640 | virtio_balloon_free_page_report_notify(NotifierWithReturn *n, void *data) | |
641 | { | |
642 | VirtIOBalloon *dev = container_of(n, VirtIOBalloon, | |
643 | free_page_report_notify); | |
644 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
645 | PrecopyNotifyData *pnd = data; | |
646 | ||
647 | if (!virtio_balloon_free_page_support(dev)) { | |
648 | /* | |
649 | * This is an optimization provided to migration, so just return 0 to | |
650 | * have the normal migration process not affected when this feature is | |
651 | * not supported. | |
652 | */ | |
653 | return 0; | |
654 | } | |
655 | ||
656 | switch (pnd->reason) { | |
657 | case PRECOPY_NOTIFY_SETUP: | |
658 | precopy_enable_free_page_optimization(); | |
659 | break; | |
c13c4153 WW |
660 | case PRECOPY_NOTIFY_BEFORE_BITMAP_SYNC: |
661 | virtio_balloon_free_page_stop(dev); | |
662 | break; | |
663 | case PRECOPY_NOTIFY_AFTER_BITMAP_SYNC: | |
664 | if (vdev->vm_running) { | |
665 | virtio_balloon_free_page_start(dev); | |
dd8eeb96 | 666 | break; |
c13c4153 | 667 | } |
dd8eeb96 DH |
668 | /* |
669 | * Set S_DONE before migrating the vmstate, so the guest will reuse | |
670 | * all hinted pages once running on the destination. Fall through. | |
671 | */ | |
672 | case PRECOPY_NOTIFY_CLEANUP: | |
673 | /* | |
674 | * Especially, if something goes wrong during precopy or if migration | |
675 | * is canceled, we have to properly communicate S_DONE to the VM. | |
676 | */ | |
677 | virtio_balloon_free_page_done(dev); | |
678 | break; | |
679 | case PRECOPY_NOTIFY_COMPLETE: | |
c13c4153 WW |
680 | break; |
681 | default: | |
682 | virtio_error(vdev, "%s: %d reason unknown", __func__, pnd->reason); | |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
2bbadb08 SH |
688 | static size_t virtio_balloon_config_size(VirtIOBalloon *s) |
689 | { | |
690 | uint64_t features = s->host_features; | |
691 | ||
692 | if (s->qemu_4_0_config_size) { | |
693 | return sizeof(struct virtio_balloon_config); | |
694 | } | |
695 | if (virtio_has_feature(features, VIRTIO_BALLOON_F_PAGE_POISON)) { | |
696 | return sizeof(struct virtio_balloon_config); | |
697 | } | |
698 | if (virtio_has_feature(features, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { | |
699 | return offsetof(struct virtio_balloon_config, poison_val); | |
700 | } | |
701 | return offsetof(struct virtio_balloon_config, free_page_report_cmd_id); | |
702 | } | |
703 | ||
bd322087 AL |
704 | static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data) |
705 | { | |
c96caced | 706 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
5385a598 | 707 | struct virtio_balloon_config config = {}; |
bd322087 AL |
708 | |
709 | config.num_pages = cpu_to_le32(dev->num_pages); | |
710 | config.actual = cpu_to_le32(dev->actual); | |
7483cbba | 711 | config.poison_val = cpu_to_le32(dev->poison_val); |
bd322087 | 712 | |
c13c4153 WW |
713 | if (dev->free_page_report_status == FREE_PAGE_REPORT_S_REQUESTED) { |
714 | config.free_page_report_cmd_id = | |
715 | cpu_to_le32(dev->free_page_report_cmd_id); | |
716 | } else if (dev->free_page_report_status == FREE_PAGE_REPORT_S_STOP) { | |
717 | config.free_page_report_cmd_id = | |
718 | cpu_to_le32(VIRTIO_BALLOON_CMD_ID_STOP); | |
719 | } else if (dev->free_page_report_status == FREE_PAGE_REPORT_S_DONE) { | |
720 | config.free_page_report_cmd_id = | |
721 | cpu_to_le32(VIRTIO_BALLOON_CMD_ID_DONE); | |
722 | } | |
723 | ||
6adfdc5a | 724 | trace_virtio_balloon_get_config(config.num_pages, config.actual); |
2bbadb08 | 725 | memcpy(config_data, &config, virtio_balloon_config_size(dev)); |
bd322087 AL |
726 | } |
727 | ||
2b75f848 VSO |
728 | static int build_dimm_list(Object *obj, void *opaque) |
729 | { | |
730 | GSList **list = opaque; | |
731 | ||
732 | if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { | |
733 | DeviceState *dev = DEVICE(obj); | |
734 | if (dev->realized) { /* only realized DIMMs matter */ | |
735 | *list = g_slist_prepend(*list, dev); | |
736 | } | |
737 | } | |
738 | ||
739 | object_child_foreach(obj, build_dimm_list, opaque); | |
740 | return 0; | |
741 | } | |
742 | ||
39de9984 VSO |
743 | static ram_addr_t get_current_ram_size(void) |
744 | { | |
e8dc06d2 | 745 | GSList *list = NULL, *item; |
39de9984 VSO |
746 | ram_addr_t size = ram_size; |
747 | ||
2b75f848 | 748 | build_dimm_list(qdev_get_machine(), &list); |
e8dc06d2 VSO |
749 | for (item = list; item; item = g_slist_next(item)) { |
750 | Object *obj = OBJECT(item->data); | |
2b75f848 VSO |
751 | if (!strcmp(object_get_typename(obj), TYPE_PC_DIMM)) { |
752 | size += object_property_get_int(obj, PC_DIMM_SIZE_PROP, | |
753 | &error_abort); | |
754 | } | |
39de9984 | 755 | } |
e8dc06d2 | 756 | g_slist_free(list); |
39de9984 VSO |
757 | |
758 | return size; | |
759 | } | |
760 | ||
7483cbba AD |
761 | static bool virtio_balloon_page_poison_support(void *opaque) |
762 | { | |
763 | VirtIOBalloon *s = opaque; | |
764 | VirtIODevice *vdev = VIRTIO_DEVICE(s); | |
765 | ||
766 | return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_POISON); | |
767 | } | |
768 | ||
bd322087 AL |
769 | static void virtio_balloon_set_config(VirtIODevice *vdev, |
770 | const uint8_t *config_data) | |
771 | { | |
c96caced | 772 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
bd322087 | 773 | struct virtio_balloon_config config; |
973603a8 | 774 | uint32_t oldactual = dev->actual; |
463756d0 HZ |
775 | ram_addr_t vm_ram_size = get_current_ram_size(); |
776 | ||
2bbadb08 | 777 | memcpy(&config, config_data, virtio_balloon_config_size(dev)); |
e54f1771 | 778 | dev->actual = le32_to_cpu(config.actual); |
973603a8 | 779 | if (dev->actual != oldactual) { |
463756d0 | 780 | qapi_event_send_balloon_change(vm_ram_size - |
3ab72385 | 781 | ((ram_addr_t) dev->actual << VIRTIO_BALLOON_PFN_SHIFT)); |
973603a8 | 782 | } |
7483cbba AD |
783 | dev->poison_val = 0; |
784 | if (virtio_balloon_page_poison_support(dev)) { | |
785 | dev->poison_val = le32_to_cpu(config.poison_val); | |
786 | } | |
6adfdc5a | 787 | trace_virtio_balloon_set_config(dev->actual, oldactual); |
bd322087 AL |
788 | } |
789 | ||
9d5b731d JW |
790 | static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f, |
791 | Error **errp) | |
bd322087 | 792 | { |
e3816255 DL |
793 | VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); |
794 | f |= dev->host_features; | |
40de55af | 795 | virtio_add_feature(&f, VIRTIO_BALLOON_F_STATS_VQ); |
c13c4153 | 796 | |
8172539d | 797 | return f; |
bd322087 AL |
798 | } |
799 | ||
96637bcd | 800 | static void virtio_balloon_stat(void *opaque, BalloonInfo *info) |
dce911c7 AS |
801 | { |
802 | VirtIOBalloon *dev = opaque; | |
463756d0 HZ |
803 | info->actual = get_current_ram_size() - ((uint64_t) dev->actual << |
804 | VIRTIO_BALLOON_PFN_SHIFT); | |
dce911c7 AS |
805 | } |
806 | ||
30fb2ca6 | 807 | static void virtio_balloon_to_target(void *opaque, ram_addr_t target) |
bd322087 | 808 | { |
c96caced FK |
809 | VirtIOBalloon *dev = VIRTIO_BALLOON(opaque); |
810 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); | |
463756d0 | 811 | ram_addr_t vm_ram_size = get_current_ram_size(); |
bd322087 | 812 | |
463756d0 HZ |
813 | if (target > vm_ram_size) { |
814 | target = vm_ram_size; | |
dce911c7 | 815 | } |
bd322087 | 816 | if (target) { |
463756d0 | 817 | dev->num_pages = (vm_ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT; |
c96caced | 818 | virtio_notify_config(vdev); |
bd322087 | 819 | } |
6adfdc5a | 820 | trace_virtio_balloon_to_target(target, dev->num_pages); |
bd322087 AL |
821 | } |
822 | ||
019518a8 | 823 | static int virtio_balloon_post_load_device(void *opaque, int version_id) |
9ea2511c | 824 | { |
019518a8 | 825 | VirtIOBalloon *s = VIRTIO_BALLOON(opaque); |
fecb48f7 PB |
826 | |
827 | if (balloon_stats_enabled(s)) { | |
828 | balloon_stats_change_timer(s, s->stats_poll_interval); | |
829 | } | |
bd322087 AL |
830 | return 0; |
831 | } | |
832 | ||
c13c4153 WW |
833 | static const VMStateDescription vmstate_virtio_balloon_free_page_report = { |
834 | .name = "virtio-balloon-device/free-page-report", | |
835 | .version_id = 1, | |
836 | .minimum_version_id = 1, | |
837 | .needed = virtio_balloon_free_page_support, | |
838 | .fields = (VMStateField[]) { | |
839 | VMSTATE_UINT32(free_page_report_cmd_id, VirtIOBalloon), | |
840 | VMSTATE_UINT32(free_page_report_status, VirtIOBalloon), | |
841 | VMSTATE_END_OF_LIST() | |
842 | } | |
843 | }; | |
844 | ||
7483cbba AD |
845 | static const VMStateDescription vmstate_virtio_balloon_page_poison = { |
846 | .name = "vitio-balloon-device/page-poison", | |
847 | .version_id = 1, | |
848 | .minimum_version_id = 1, | |
849 | .needed = virtio_balloon_page_poison_support, | |
850 | .fields = (VMStateField[]) { | |
851 | VMSTATE_UINT32(poison_val, VirtIOBalloon), | |
852 | VMSTATE_END_OF_LIST() | |
853 | } | |
854 | }; | |
855 | ||
019518a8 DDAG |
856 | static const VMStateDescription vmstate_virtio_balloon_device = { |
857 | .name = "virtio-balloon-device", | |
858 | .version_id = 1, | |
859 | .minimum_version_id = 1, | |
860 | .post_load = virtio_balloon_post_load_device, | |
861 | .fields = (VMStateField[]) { | |
862 | VMSTATE_UINT32(num_pages, VirtIOBalloon), | |
863 | VMSTATE_UINT32(actual, VirtIOBalloon), | |
864 | VMSTATE_END_OF_LIST() | |
865 | }, | |
c13c4153 WW |
866 | .subsections = (const VMStateDescription * []) { |
867 | &vmstate_virtio_balloon_free_page_report, | |
7483cbba | 868 | &vmstate_virtio_balloon_page_poison, |
c13c4153 WW |
869 | NULL |
870 | } | |
019518a8 DDAG |
871 | }; |
872 | ||
74def47c | 873 | static void virtio_balloon_device_realize(DeviceState *dev, Error **errp) |
bd322087 | 874 | { |
74def47c | 875 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
a546fb17 | 876 | VirtIOBalloon *s = VIRTIO_BALLOON(dev); |
f76f6655 | 877 | int ret; |
bd322087 | 878 | |
e6baf613 | 879 | virtio_init(vdev, "virtio-balloon", VIRTIO_ID_BALLOON, |
2bbadb08 | 880 | virtio_balloon_config_size(s)); |
bd322087 | 881 | |
f76f6655 AS |
882 | ret = qemu_add_balloon_handler(virtio_balloon_to_target, |
883 | virtio_balloon_stat, s); | |
5c7d0962 | 884 | |
1ab461b5 | 885 | if (ret < 0) { |
46abb812 | 886 | error_setg(errp, "Only one balloon device is supported"); |
a546fb17 | 887 | virtio_cleanup(vdev); |
74def47c | 888 | return; |
1ab461b5 | 889 | } |
f76f6655 | 890 | |
12fc8903 DH |
891 | if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_FREE_PAGE_HINT) && |
892 | !s->iothread) { | |
893 | error_setg(errp, "'free-page-hint' requires 'iothread' to be set"); | |
894 | virtio_cleanup(vdev); | |
895 | return; | |
896 | } | |
897 | ||
5c7d0962 FK |
898 | s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); |
899 | s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); | |
900 | s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats); | |
bd322087 | 901 | |
c13c4153 WW |
902 | if (virtio_has_feature(s->host_features, |
903 | VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { | |
904 | s->free_page_vq = virtio_add_queue(vdev, VIRTQUEUE_MAX_SIZE, | |
905 | virtio_balloon_handle_free_page_vq); | |
c13c4153 | 906 | precopy_add_notifier(&s->free_page_report_notify); |
12fc8903 DH |
907 | |
908 | object_ref(OBJECT(s->iothread)); | |
909 | s->free_page_bh = aio_bh_new(iothread_get_aio_context(s->iothread), | |
910 | virtio_ballloon_get_free_page_hints, s); | |
c13c4153 | 911 | } |
91b86719 AD |
912 | |
913 | if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_REPORTING)) { | |
914 | s->reporting_vq = virtio_add_queue(vdev, 32, | |
915 | virtio_balloon_handle_report); | |
916 | } | |
917 | ||
38dbd48b | 918 | reset_stats(s); |
1ab461b5 FK |
919 | } |
920 | ||
b69c3c21 | 921 | static void virtio_balloon_device_unrealize(DeviceState *dev) |
1ab461b5 | 922 | { |
306ec6c3 AF |
923 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
924 | VirtIOBalloon *s = VIRTIO_BALLOON(dev); | |
1ab461b5 | 925 | |
49b01711 | 926 | if (s->free_page_bh) { |
c13c4153 | 927 | qemu_bh_delete(s->free_page_bh); |
105aef9c | 928 | object_unref(OBJECT(s->iothread)); |
c13c4153 WW |
929 | virtio_balloon_free_page_stop(s); |
930 | precopy_remove_notifier(&s->free_page_report_notify); | |
931 | } | |
1ab461b5 FK |
932 | balloon_stats_destroy_timer(s); |
933 | qemu_remove_balloon_handler(s); | |
36278428 PN |
934 | |
935 | virtio_delete_queue(s->ivq); | |
936 | virtio_delete_queue(s->dvq); | |
937 | virtio_delete_queue(s->svq); | |
938 | if (s->free_page_vq) { | |
939 | virtio_delete_queue(s->free_page_vq); | |
940 | } | |
91b86719 AD |
941 | if (s->reporting_vq) { |
942 | virtio_delete_queue(s->reporting_vq); | |
943 | } | |
6a1a8cc7 | 944 | virtio_cleanup(vdev); |
1ab461b5 FK |
945 | } |
946 | ||
4eae2a65 LP |
947 | static void virtio_balloon_device_reset(VirtIODevice *vdev) |
948 | { | |
949 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
950 | ||
c13c4153 WW |
951 | if (virtio_balloon_free_page_support(s)) { |
952 | virtio_balloon_free_page_stop(s); | |
953 | } | |
954 | ||
4eae2a65 | 955 | if (s->stats_vq_elem != NULL) { |
27e57efe | 956 | virtqueue_unpop(s->svq, s->stats_vq_elem, 0); |
4eae2a65 LP |
957 | g_free(s->stats_vq_elem); |
958 | s->stats_vq_elem = NULL; | |
959 | } | |
7483cbba AD |
960 | |
961 | s->poison_val = 0; | |
4eae2a65 LP |
962 | } |
963 | ||
4a1e48be LP |
964 | static void virtio_balloon_set_status(VirtIODevice *vdev, uint8_t status) |
965 | { | |
966 | VirtIOBalloon *s = VIRTIO_BALLOON(vdev); | |
967 | ||
968 | if (!s->stats_vq_elem && vdev->vm_running && | |
969 | (status & VIRTIO_CONFIG_S_DRIVER_OK) && virtqueue_rewind(s->svq, 1)) { | |
970 | /* poll stats queue for the element we have discarded when the VM | |
971 | * was stopped */ | |
972 | virtio_balloon_receive_stats(vdev, s->svq); | |
973 | } | |
c13c4153 WW |
974 | |
975 | if (virtio_balloon_free_page_support(s)) { | |
976 | /* | |
977 | * The VM is woken up and the iothread was blocked, so signal it to | |
978 | * continue. | |
979 | */ | |
980 | if (vdev->vm_running && s->block_iothread) { | |
981 | qemu_mutex_lock(&s->free_page_lock); | |
982 | s->block_iothread = false; | |
983 | qemu_cond_signal(&s->free_page_cond); | |
984 | qemu_mutex_unlock(&s->free_page_lock); | |
985 | } | |
986 | ||
987 | /* The VM is stopped, block the iothread. */ | |
988 | if (!vdev->vm_running) { | |
989 | qemu_mutex_lock(&s->free_page_lock); | |
990 | s->block_iothread = true; | |
991 | qemu_mutex_unlock(&s->free_page_lock); | |
992 | } | |
993 | } | |
4a1e48be LP |
994 | } |
995 | ||
1190044e SZ |
996 | static void virtio_balloon_instance_init(Object *obj) |
997 | { | |
998 | VirtIOBalloon *s = VIRTIO_BALLOON(obj); | |
999 | ||
12fc8903 DH |
1000 | qemu_mutex_init(&s->free_page_lock); |
1001 | qemu_cond_init(&s->free_page_cond); | |
1002 | s->free_page_report_cmd_id = VIRTIO_BALLOON_FREE_PAGE_REPORT_CMD_ID_MIN; | |
1003 | s->free_page_report_notify.notify = virtio_balloon_free_page_report_notify; | |
1004 | ||
1190044e | 1005 | object_property_add(obj, "guest-stats", "guest statistics", |
d2623129 | 1006 | balloon_stats_get_all, NULL, NULL, s); |
1190044e SZ |
1007 | |
1008 | object_property_add(obj, "guest-stats-polling-interval", "int", | |
1009 | balloon_stats_get_poll_interval, | |
1010 | balloon_stats_set_poll_interval, | |
d2623129 | 1011 | NULL, s); |
1190044e SZ |
1012 | } |
1013 | ||
c5dc16b7 HP |
1014 | static const VMStateDescription vmstate_virtio_balloon = { |
1015 | .name = "virtio-balloon", | |
1016 | .minimum_version_id = 1, | |
1017 | .version_id = 1, | |
1018 | .fields = (VMStateField[]) { | |
1019 | VMSTATE_VIRTIO_DEVICE, | |
1020 | VMSTATE_END_OF_LIST() | |
1021 | }, | |
1022 | }; | |
7f1ca9b2 | 1023 | |
1ab461b5 | 1024 | static Property virtio_balloon_properties[] = { |
e3816255 DL |
1025 | DEFINE_PROP_BIT("deflate-on-oom", VirtIOBalloon, host_features, |
1026 | VIRTIO_BALLOON_F_DEFLATE_ON_OOM, false), | |
c13c4153 WW |
1027 | DEFINE_PROP_BIT("free-page-hint", VirtIOBalloon, host_features, |
1028 | VIRTIO_BALLOON_F_FREE_PAGE_HINT, false), | |
7483cbba AD |
1029 | DEFINE_PROP_BIT("page-poison", VirtIOBalloon, host_features, |
1030 | VIRTIO_BALLOON_F_PAGE_POISON, true), | |
91b86719 AD |
1031 | DEFINE_PROP_BIT("free-page-reporting", VirtIOBalloon, host_features, |
1032 | VIRTIO_BALLOON_F_REPORTING, false), | |
2bbadb08 SH |
1033 | /* QEMU 4.0 accidentally changed the config size even when free-page-hint |
1034 | * is disabled, resulting in QEMU 3.1 migration incompatibility. This | |
1035 | * property retains this quirk for QEMU 4.1 machine types. | |
1036 | */ | |
1037 | DEFINE_PROP_BOOL("qemu-4-0-config-size", VirtIOBalloon, | |
1038 | qemu_4_0_config_size, false), | |
c13c4153 WW |
1039 | DEFINE_PROP_LINK("iothread", VirtIOBalloon, iothread, TYPE_IOTHREAD, |
1040 | IOThread *), | |
1ab461b5 FK |
1041 | DEFINE_PROP_END_OF_LIST(), |
1042 | }; | |
1043 | ||
1044 | static void virtio_balloon_class_init(ObjectClass *klass, void *data) | |
1045 | { | |
1046 | DeviceClass *dc = DEVICE_CLASS(klass); | |
1047 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); | |
74def47c | 1048 | |
4f67d30b | 1049 | device_class_set_props(dc, virtio_balloon_properties); |
7f1ca9b2 | 1050 | dc->vmsd = &vmstate_virtio_balloon; |
125ee0ed | 1051 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
74def47c | 1052 | vdc->realize = virtio_balloon_device_realize; |
306ec6c3 | 1053 | vdc->unrealize = virtio_balloon_device_unrealize; |
4eae2a65 | 1054 | vdc->reset = virtio_balloon_device_reset; |
1ab461b5 FK |
1055 | vdc->get_config = virtio_balloon_get_config; |
1056 | vdc->set_config = virtio_balloon_set_config; | |
1057 | vdc->get_features = virtio_balloon_get_features; | |
4a1e48be | 1058 | vdc->set_status = virtio_balloon_set_status; |
019518a8 | 1059 | vdc->vmsd = &vmstate_virtio_balloon_device; |
1ab461b5 FK |
1060 | } |
1061 | ||
1062 | static const TypeInfo virtio_balloon_info = { | |
1063 | .name = TYPE_VIRTIO_BALLOON, | |
1064 | .parent = TYPE_VIRTIO_DEVICE, | |
1065 | .instance_size = sizeof(VirtIOBalloon), | |
1190044e | 1066 | .instance_init = virtio_balloon_instance_init, |
1ab461b5 FK |
1067 | .class_init = virtio_balloon_class_init, |
1068 | }; | |
1069 | ||
1070 | static void virtio_register_types(void) | |
1071 | { | |
1072 | type_register_static(&virtio_balloon_info); | |
1073 | } | |
1074 | ||
1075 | type_init(virtio_register_types) |