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1 | bd322087 | aliguori | /*
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2 | d4443cb6 | Amit Shah | * Virtio Balloon Device
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3 | bd322087 | aliguori | *
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4 | bd322087 | aliguori | * Copyright IBM, Corp. 2008
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5 | d4443cb6 | Amit Shah | * Copyright (C) 2011 Red Hat, Inc.
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6 | d4443cb6 | Amit Shah | * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
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7 | bd322087 | aliguori | *
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8 | bd322087 | aliguori | * Authors:
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9 | bd322087 | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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10 | bd322087 | aliguori | *
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11 | bd322087 | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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12 | bd322087 | aliguori | * the COPYING file in the top-level directory.
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13 | bd322087 | aliguori | *
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14 | bd322087 | aliguori | */
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15 | bd322087 | aliguori | |
16 | fa6111f2 | Amit Shah | #include "iov.h" |
17 | bd322087 | aliguori | #include "qemu-common.h" |
18 | bd322087 | aliguori | #include "virtio.h" |
19 | bd322087 | aliguori | #include "pc.h" |
20 | bd322087 | aliguori | #include "cpu.h" |
21 | 625a5bef | Adam Litke | #include "monitor.h" |
22 | bd322087 | aliguori | #include "balloon.h" |
23 | bd322087 | aliguori | #include "virtio-balloon.h" |
24 | bd322087 | aliguori | #include "kvm.h" |
25 | 625a5bef | Adam Litke | #include "qlist.h" |
26 | 625a5bef | Adam Litke | #include "qint.h" |
27 | 625a5bef | Adam Litke | #include "qstring.h" |
28 | bd322087 | aliguori | |
29 | bd322087 | aliguori | #if defined(__linux__)
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30 | bd322087 | aliguori | #include <sys/mman.h> |
31 | bd322087 | aliguori | #endif
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32 | bd322087 | aliguori | |
33 | 07b0403d | Eduardo Habkost | /* Disable guest-provided stats by now (https://bugzilla.redhat.com/show_bug.cgi?id=623903) */
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34 | 07b0403d | Eduardo Habkost | #define ENABLE_GUEST_STATS 0 |
35 | 07b0403d | Eduardo Habkost | |
36 | 07b0403d | Eduardo Habkost | |
37 | bd322087 | aliguori | typedef struct VirtIOBalloon |
38 | bd322087 | aliguori | { |
39 | bd322087 | aliguori | VirtIODevice vdev; |
40 | 625a5bef | Adam Litke | VirtQueue *ivq, *dvq, *svq; |
41 | bd322087 | aliguori | uint32_t num_pages; |
42 | bd322087 | aliguori | uint32_t actual; |
43 | 625a5bef | Adam Litke | uint64_t stats[VIRTIO_BALLOON_S_NR]; |
44 | 625a5bef | Adam Litke | VirtQueueElement stats_vq_elem; |
45 | 625a5bef | Adam Litke | size_t stats_vq_offset; |
46 | 625a5bef | Adam Litke | MonitorCompletion *stats_callback; |
47 | 625a5bef | Adam Litke | void *stats_opaque_callback_data;
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48 | ac720400 | Amit Shah | DeviceState *qdev; |
49 | bd322087 | aliguori | } VirtIOBalloon; |
50 | bd322087 | aliguori | |
51 | bd322087 | aliguori | static VirtIOBalloon *to_virtio_balloon(VirtIODevice *vdev)
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52 | bd322087 | aliguori | { |
53 | bd322087 | aliguori | return (VirtIOBalloon *)vdev;
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54 | bd322087 | aliguori | } |
55 | bd322087 | aliguori | |
56 | bd322087 | aliguori | static void balloon_page(void *addr, int deflate) |
57 | bd322087 | aliguori | { |
58 | bd322087 | aliguori | #if defined(__linux__)
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59 | bd322087 | aliguori | if (!kvm_enabled() || kvm_has_sync_mmu())
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60 | e78815a5 | Andreas Färber | qemu_madvise(addr, TARGET_PAGE_SIZE, |
61 | e78815a5 | Andreas Färber | deflate ? QEMU_MADV_WILLNEED : QEMU_MADV_DONTNEED); |
62 | bd322087 | aliguori | #endif
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63 | bd322087 | aliguori | } |
64 | bd322087 | aliguori | |
65 | 625a5bef | Adam Litke | /*
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66 | 625a5bef | Adam Litke | * reset_stats - Mark all items in the stats array as unset
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67 | 625a5bef | Adam Litke | *
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68 | 625a5bef | Adam Litke | * This function needs to be called at device intialization and before
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69 | 625a5bef | Adam Litke | * before updating to a set of newly-generated stats. This will ensure that no
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70 | 625a5bef | Adam Litke | * stale values stick around in case the guest reports a subset of the supported
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71 | 625a5bef | Adam Litke | * statistics.
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72 | 625a5bef | Adam Litke | */
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73 | 625a5bef | Adam Litke | static inline void reset_stats(VirtIOBalloon *dev) |
74 | 625a5bef | Adam Litke | { |
75 | 625a5bef | Adam Litke | int i;
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76 | 625a5bef | Adam Litke | for (i = 0; i < VIRTIO_BALLOON_S_NR; dev->stats[i++] = -1); |
77 | 625a5bef | Adam Litke | } |
78 | 625a5bef | Adam Litke | |
79 | 625a5bef | Adam Litke | static void stat_put(QDict *dict, const char *label, uint64_t val) |
80 | 625a5bef | Adam Litke | { |
81 | 625a5bef | Adam Litke | if (val != -1) |
82 | 625a5bef | Adam Litke | qdict_put(dict, label, qint_from_int(val)); |
83 | 625a5bef | Adam Litke | } |
84 | 625a5bef | Adam Litke | |
85 | 625a5bef | Adam Litke | static QObject *get_stats_qobject(VirtIOBalloon *dev)
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86 | 625a5bef | Adam Litke | { |
87 | 625a5bef | Adam Litke | QDict *dict = qdict_new(); |
88 | bd12ff9d | Adam Litke | uint64_t actual = ram_size - ((uint64_t) dev->actual << |
89 | bd12ff9d | Adam Litke | VIRTIO_BALLOON_PFN_SHIFT); |
90 | 625a5bef | Adam Litke | |
91 | 625a5bef | Adam Litke | stat_put(dict, "actual", actual);
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92 | 07b0403d | Eduardo Habkost | #if ENABLE_GUEST_STATS
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93 | 625a5bef | Adam Litke | stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]);
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94 | 625a5bef | Adam Litke | stat_put(dict, "mem_swapped_out", dev->stats[VIRTIO_BALLOON_S_SWAP_OUT]);
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95 | 625a5bef | Adam Litke | stat_put(dict, "major_page_faults", dev->stats[VIRTIO_BALLOON_S_MAJFLT]);
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96 | 625a5bef | Adam Litke | stat_put(dict, "minor_page_faults", dev->stats[VIRTIO_BALLOON_S_MINFLT]);
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97 | 625a5bef | Adam Litke | stat_put(dict, "free_mem", dev->stats[VIRTIO_BALLOON_S_MEMFREE]);
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98 | 625a5bef | Adam Litke | stat_put(dict, "total_mem", dev->stats[VIRTIO_BALLOON_S_MEMTOT]);
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99 | 07b0403d | Eduardo Habkost | #endif
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100 | 625a5bef | Adam Litke | |
101 | 625a5bef | Adam Litke | return QOBJECT(dict);
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102 | 625a5bef | Adam Litke | } |
103 | 625a5bef | Adam Litke | |
104 | bd322087 | aliguori | static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
105 | bd322087 | aliguori | { |
106 | bd322087 | aliguori | VirtIOBalloon *s = to_virtio_balloon(vdev); |
107 | bd322087 | aliguori | VirtQueueElement elem; |
108 | bd322087 | aliguori | |
109 | bd322087 | aliguori | while (virtqueue_pop(vq, &elem)) {
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110 | bd322087 | aliguori | size_t offset = 0;
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111 | bd322087 | aliguori | uint32_t pfn; |
112 | bd322087 | aliguori | |
113 | fa6111f2 | Amit Shah | while (iov_to_buf(elem.out_sg, elem.out_num, &pfn, offset, 4) == 4) { |
114 | c227f099 | Anthony Liguori | ram_addr_t pa; |
115 | c227f099 | Anthony Liguori | ram_addr_t addr; |
116 | bd322087 | aliguori | |
117 | c227f099 | Anthony Liguori | pa = (ram_addr_t)ldl_p(&pfn) << VIRTIO_BALLOON_PFN_SHIFT; |
118 | bd322087 | aliguori | offset += 4;
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119 | bd322087 | aliguori | |
120 | bd322087 | aliguori | addr = cpu_get_physical_page_desc(pa); |
121 | bd322087 | aliguori | if ((addr & ~TARGET_PAGE_MASK) != IO_MEM_RAM)
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122 | bd322087 | aliguori | continue;
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123 | bd322087 | aliguori | |
124 | 5c130f65 | pbrook | /* Using qemu_get_ram_ptr is bending the rules a bit, but
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125 | 5c130f65 | pbrook | should be OK because we only want a single page. */
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126 | 5c130f65 | pbrook | balloon_page(qemu_get_ram_ptr(addr), !!(vq == s->dvq)); |
127 | bd322087 | aliguori | } |
128 | bd322087 | aliguori | |
129 | bd322087 | aliguori | virtqueue_push(vq, &elem, offset); |
130 | bd322087 | aliguori | virtio_notify(vdev, vq); |
131 | bd322087 | aliguori | } |
132 | bd322087 | aliguori | } |
133 | bd322087 | aliguori | |
134 | 625a5bef | Adam Litke | static void complete_stats_request(VirtIOBalloon *vb) |
135 | 625a5bef | Adam Litke | { |
136 | 625a5bef | Adam Litke | QObject *stats; |
137 | 625a5bef | Adam Litke | |
138 | 625a5bef | Adam Litke | if (!vb->stats_opaque_callback_data)
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139 | 625a5bef | Adam Litke | return;
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140 | 625a5bef | Adam Litke | |
141 | 625a5bef | Adam Litke | stats = get_stats_qobject(vb); |
142 | 625a5bef | Adam Litke | vb->stats_callback(vb->stats_opaque_callback_data, stats); |
143 | 625a5bef | Adam Litke | qobject_decref(stats); |
144 | 625a5bef | Adam Litke | vb->stats_opaque_callback_data = NULL;
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145 | 625a5bef | Adam Litke | vb->stats_callback = NULL;
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146 | 625a5bef | Adam Litke | } |
147 | 625a5bef | Adam Litke | |
148 | 625a5bef | Adam Litke | static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq) |
149 | 625a5bef | Adam Litke | { |
150 | 625a5bef | Adam Litke | VirtIOBalloon *s = DO_UPCAST(VirtIOBalloon, vdev, vdev); |
151 | 625a5bef | Adam Litke | VirtQueueElement *elem = &s->stats_vq_elem; |
152 | 625a5bef | Adam Litke | VirtIOBalloonStat stat; |
153 | 625a5bef | Adam Litke | size_t offset = 0;
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154 | 625a5bef | Adam Litke | |
155 | 625a5bef | Adam Litke | if (!virtqueue_pop(vq, elem)) {
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156 | 625a5bef | Adam Litke | return;
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157 | 625a5bef | Adam Litke | } |
158 | 625a5bef | Adam Litke | |
159 | 625a5bef | Adam Litke | /* Initialize the stats to get rid of any stale values. This is only
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160 | 625a5bef | Adam Litke | * needed to handle the case where a guest supports fewer stats than it
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161 | 625a5bef | Adam Litke | * used to (ie. it has booted into an old kernel).
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162 | 625a5bef | Adam Litke | */
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163 | 625a5bef | Adam Litke | reset_stats(s); |
164 | 625a5bef | Adam Litke | |
165 | fa6111f2 | Amit Shah | while (iov_to_buf(elem->out_sg, elem->out_num, &stat, offset, sizeof(stat)) |
166 | fa6111f2 | Amit Shah | == sizeof(stat)) {
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167 | 625a5bef | Adam Litke | uint16_t tag = tswap16(stat.tag); |
168 | 625a5bef | Adam Litke | uint64_t val = tswap64(stat.val); |
169 | 625a5bef | Adam Litke | |
170 | 625a5bef | Adam Litke | offset += sizeof(stat);
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171 | 625a5bef | Adam Litke | if (tag < VIRTIO_BALLOON_S_NR)
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172 | 625a5bef | Adam Litke | s->stats[tag] = val; |
173 | 625a5bef | Adam Litke | } |
174 | 625a5bef | Adam Litke | s->stats_vq_offset = offset; |
175 | 625a5bef | Adam Litke | |
176 | 625a5bef | Adam Litke | complete_stats_request(s); |
177 | 625a5bef | Adam Litke | } |
178 | 625a5bef | Adam Litke | |
179 | bd322087 | aliguori | static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data) |
180 | bd322087 | aliguori | { |
181 | bd322087 | aliguori | VirtIOBalloon *dev = to_virtio_balloon(vdev); |
182 | bd322087 | aliguori | struct virtio_balloon_config config;
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183 | bd322087 | aliguori | |
184 | bd322087 | aliguori | config.num_pages = cpu_to_le32(dev->num_pages); |
185 | bd322087 | aliguori | config.actual = cpu_to_le32(dev->actual); |
186 | bd322087 | aliguori | |
187 | bd322087 | aliguori | memcpy(config_data, &config, 8);
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188 | bd322087 | aliguori | } |
189 | bd322087 | aliguori | |
190 | bd322087 | aliguori | static void virtio_balloon_set_config(VirtIODevice *vdev, |
191 | bd322087 | aliguori | const uint8_t *config_data)
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192 | bd322087 | aliguori | { |
193 | bd322087 | aliguori | VirtIOBalloon *dev = to_virtio_balloon(vdev); |
194 | bd322087 | aliguori | struct virtio_balloon_config config;
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195 | bd322087 | aliguori | memcpy(&config, config_data, 8);
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196 | e54f1771 | Alexey Kardashevskiy | dev->actual = le32_to_cpu(config.actual); |
197 | bd322087 | aliguori | } |
198 | bd322087 | aliguori | |
199 | 8172539d | Michael S. Tsirkin | static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
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200 | bd322087 | aliguori | { |
201 | 625a5bef | Adam Litke | f |= (1 << VIRTIO_BALLOON_F_STATS_VQ);
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202 | 8172539d | Michael S. Tsirkin | return f;
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203 | bd322087 | aliguori | } |
204 | bd322087 | aliguori | |
205 | dce911c7 | Amit Shah | static void virtio_balloon_stat(void *opaque, MonitorCompletion cb, |
206 | dce911c7 | Amit Shah | void *cb_data)
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207 | dce911c7 | Amit Shah | { |
208 | dce911c7 | Amit Shah | VirtIOBalloon *dev = opaque; |
209 | dce911c7 | Amit Shah | |
210 | dce911c7 | Amit Shah | /* For now, only allow one request at a time. This restriction can be
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211 | dce911c7 | Amit Shah | * removed later by queueing callback and data pairs.
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212 | dce911c7 | Amit Shah | */
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213 | dce911c7 | Amit Shah | if (dev->stats_callback != NULL) { |
214 | dce911c7 | Amit Shah | return;
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215 | dce911c7 | Amit Shah | } |
216 | dce911c7 | Amit Shah | dev->stats_callback = cb; |
217 | dce911c7 | Amit Shah | dev->stats_opaque_callback_data = cb_data; |
218 | dce911c7 | Amit Shah | |
219 | dce911c7 | Amit Shah | if (ENABLE_GUEST_STATS
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220 | dce911c7 | Amit Shah | && (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ))) {
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221 | dce911c7 | Amit Shah | virtqueue_push(dev->svq, &dev->stats_vq_elem, dev->stats_vq_offset); |
222 | dce911c7 | Amit Shah | virtio_notify(&dev->vdev, dev->svq); |
223 | dce911c7 | Amit Shah | return;
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224 | dce911c7 | Amit Shah | } |
225 | dce911c7 | Amit Shah | |
226 | dce911c7 | Amit Shah | /* Stats are not supported. Clear out any stale values that might
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227 | dce911c7 | Amit Shah | * have been set by a more featureful guest kernel.
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228 | dce911c7 | Amit Shah | */
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229 | dce911c7 | Amit Shah | reset_stats(dev); |
230 | dce911c7 | Amit Shah | complete_stats_request(dev); |
231 | dce911c7 | Amit Shah | } |
232 | dce911c7 | Amit Shah | |
233 | 30fb2ca6 | Amit Shah | static void virtio_balloon_to_target(void *opaque, ram_addr_t target) |
234 | bd322087 | aliguori | { |
235 | bd322087 | aliguori | VirtIOBalloon *dev = opaque; |
236 | bd322087 | aliguori | |
237 | dce911c7 | Amit Shah | if (target > ram_size) {
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238 | bd322087 | aliguori | target = ram_size; |
239 | dce911c7 | Amit Shah | } |
240 | bd322087 | aliguori | if (target) {
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241 | bd322087 | aliguori | dev->num_pages = (ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT; |
242 | bd322087 | aliguori | virtio_notify_config(&dev->vdev); |
243 | bd322087 | aliguori | } |
244 | bd322087 | aliguori | } |
245 | bd322087 | aliguori | |
246 | bd322087 | aliguori | static void virtio_balloon_save(QEMUFile *f, void *opaque) |
247 | bd322087 | aliguori | { |
248 | bd322087 | aliguori | VirtIOBalloon *s = opaque; |
249 | bd322087 | aliguori | |
250 | bd322087 | aliguori | virtio_save(&s->vdev, f); |
251 | bd322087 | aliguori | |
252 | bd322087 | aliguori | qemu_put_be32(f, s->num_pages); |
253 | bd322087 | aliguori | qemu_put_be32(f, s->actual); |
254 | bd322087 | aliguori | } |
255 | bd322087 | aliguori | |
256 | bd322087 | aliguori | static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id) |
257 | bd322087 | aliguori | { |
258 | bd322087 | aliguori | VirtIOBalloon *s = opaque; |
259 | bd322087 | aliguori | |
260 | bd322087 | aliguori | if (version_id != 1) |
261 | bd322087 | aliguori | return -EINVAL;
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262 | bd322087 | aliguori | |
263 | bd322087 | aliguori | virtio_load(&s->vdev, f); |
264 | bd322087 | aliguori | |
265 | bd322087 | aliguori | s->num_pages = qemu_get_be32(f); |
266 | bd322087 | aliguori | s->actual = qemu_get_be32(f); |
267 | bd322087 | aliguori | return 0; |
268 | bd322087 | aliguori | } |
269 | bd322087 | aliguori | |
270 | 53c25cea | Paul Brook | VirtIODevice *virtio_balloon_init(DeviceState *dev) |
271 | bd322087 | aliguori | { |
272 | bd322087 | aliguori | VirtIOBalloon *s; |
273 | f76f6655 | Amit Shah | int ret;
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274 | bd322087 | aliguori | |
275 | 53c25cea | Paul Brook | s = (VirtIOBalloon *)virtio_common_init("virtio-balloon",
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276 | 53c25cea | Paul Brook | VIRTIO_ID_BALLOON, |
277 | 53c25cea | Paul Brook | 8, sizeof(VirtIOBalloon)); |
278 | bd322087 | aliguori | |
279 | bd322087 | aliguori | s->vdev.get_config = virtio_balloon_get_config; |
280 | bd322087 | aliguori | s->vdev.set_config = virtio_balloon_set_config; |
281 | bd322087 | aliguori | s->vdev.get_features = virtio_balloon_get_features; |
282 | bd322087 | aliguori | |
283 | f76f6655 | Amit Shah | ret = qemu_add_balloon_handler(virtio_balloon_to_target, |
284 | f76f6655 | Amit Shah | virtio_balloon_stat, s); |
285 | f76f6655 | Amit Shah | if (ret < 0) { |
286 | f76f6655 | Amit Shah | virtio_cleanup(&s->vdev); |
287 | f76f6655 | Amit Shah | return NULL; |
288 | f76f6655 | Amit Shah | } |
289 | f76f6655 | Amit Shah | |
290 | bd322087 | aliguori | s->ivq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
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291 | bd322087 | aliguori | s->dvq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
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292 | 625a5bef | Adam Litke | s->svq = virtio_add_queue(&s->vdev, 128, virtio_balloon_receive_stats);
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293 | bd322087 | aliguori | |
294 | 625a5bef | Adam Litke | reset_stats(s); |
295 | bd322087 | aliguori | |
296 | ac720400 | Amit Shah | s->qdev = dev; |
297 | 0be71e32 | Alex Williamson | register_savevm(dev, "virtio-balloon", -1, 1, |
298 | 0be71e32 | Alex Williamson | virtio_balloon_save, virtio_balloon_load, s); |
299 | bd322087 | aliguori | |
300 | 53c25cea | Paul Brook | return &s->vdev;
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301 | bd322087 | aliguori | } |
302 | 855d7e25 | Amit Shah | |
303 | 855d7e25 | Amit Shah | void virtio_balloon_exit(VirtIODevice *vdev)
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304 | 855d7e25 | Amit Shah | { |
305 | ac720400 | Amit Shah | VirtIOBalloon *s = DO_UPCAST(VirtIOBalloon, vdev, vdev); |
306 | ac720400 | Amit Shah | unregister_savevm(s->qdev, "virtio-balloon", s);
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307 | 855d7e25 | Amit Shah | virtio_cleanup(vdev); |
308 | 855d7e25 | Amit Shah | } |