root / block-migration.c @ 1d2699ae
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1 | c163b5ca | lirans@il.ibm.com | /*
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2 | c163b5ca | lirans@il.ibm.com | * QEMU live block migration
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3 | c163b5ca | lirans@il.ibm.com | *
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4 | c163b5ca | lirans@il.ibm.com | * Copyright IBM, Corp. 2009
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5 | c163b5ca | lirans@il.ibm.com | *
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6 | c163b5ca | lirans@il.ibm.com | * Authors:
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7 | c163b5ca | lirans@il.ibm.com | * Liran Schour <lirans@il.ibm.com>
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8 | c163b5ca | lirans@il.ibm.com | *
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9 | c163b5ca | lirans@il.ibm.com | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | c163b5ca | lirans@il.ibm.com | * the COPYING file in the top-level directory.
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11 | c163b5ca | lirans@il.ibm.com | *
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12 | c163b5ca | lirans@il.ibm.com | */
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13 | c163b5ca | lirans@il.ibm.com | |
14 | c163b5ca | lirans@il.ibm.com | #include "qemu-common.h" |
15 | c163b5ca | lirans@il.ibm.com | #include "block_int.h" |
16 | c163b5ca | lirans@il.ibm.com | #include "hw/hw.h" |
17 | 5e5328be | Jan Kiszka | #include "qemu-queue.h" |
18 | 7184049e | Jan Kiszka | #include "monitor.h" |
19 | c163b5ca | lirans@il.ibm.com | #include "block-migration.h" |
20 | c163b5ca | lirans@il.ibm.com | #include <assert.h> |
21 | c163b5ca | lirans@il.ibm.com | |
22 | 6ea44308 | Jan Kiszka | #define BLOCK_SIZE (BDRV_SECTORS_PER_DIRTY_CHUNK << BDRV_SECTOR_BITS)
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23 | c163b5ca | lirans@il.ibm.com | |
24 | c163b5ca | lirans@il.ibm.com | #define BLK_MIG_FLAG_DEVICE_BLOCK 0x01 |
25 | c163b5ca | lirans@il.ibm.com | #define BLK_MIG_FLAG_EOS 0x02 |
26 | 01e61e2d | Jan Kiszka | #define BLK_MIG_FLAG_PROGRESS 0x04 |
27 | c163b5ca | lirans@il.ibm.com | |
28 | c163b5ca | lirans@il.ibm.com | #define MAX_IS_ALLOCATED_SEARCH 65536 |
29 | c163b5ca | lirans@il.ibm.com | #define MAX_BLOCKS_READ 10000 |
30 | c163b5ca | lirans@il.ibm.com | #define BLOCKS_READ_CHANGE 100 |
31 | c163b5ca | lirans@il.ibm.com | #define INITIAL_BLOCKS_READ 100 |
32 | c163b5ca | lirans@il.ibm.com | |
33 | c163b5ca | lirans@il.ibm.com | //#define DEBUG_BLK_MIGRATION
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34 | c163b5ca | lirans@il.ibm.com | |
35 | c163b5ca | lirans@il.ibm.com | #ifdef DEBUG_BLK_MIGRATION
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36 | a55eb92c | Jan Kiszka | #define dprintf(fmt, ...) \
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37 | c163b5ca | lirans@il.ibm.com | do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0) |
38 | c163b5ca | lirans@il.ibm.com | #else
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39 | a55eb92c | Jan Kiszka | #define dprintf(fmt, ...) \
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40 | c163b5ca | lirans@il.ibm.com | do { } while (0) |
41 | c163b5ca | lirans@il.ibm.com | #endif
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42 | c163b5ca | lirans@il.ibm.com | |
43 | a55eb92c | Jan Kiszka | typedef struct BlkMigDevState { |
44 | a55eb92c | Jan Kiszka | BlockDriverState *bs; |
45 | a55eb92c | Jan Kiszka | int bulk_completed;
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46 | a55eb92c | Jan Kiszka | int shared_base;
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47 | a55eb92c | Jan Kiszka | int64_t cur_sector; |
48 | 82801d8f | Jan Kiszka | int64_t completed_sectors; |
49 | a55eb92c | Jan Kiszka | int64_t total_sectors; |
50 | a55eb92c | Jan Kiszka | int64_t dirty; |
51 | 5e5328be | Jan Kiszka | QSIMPLEQ_ENTRY(BlkMigDevState) entry; |
52 | a55eb92c | Jan Kiszka | } BlkMigDevState; |
53 | a55eb92c | Jan Kiszka | |
54 | c163b5ca | lirans@il.ibm.com | typedef struct BlkMigBlock { |
55 | c163b5ca | lirans@il.ibm.com | uint8_t *buf; |
56 | c163b5ca | lirans@il.ibm.com | BlkMigDevState *bmds; |
57 | c163b5ca | lirans@il.ibm.com | int64_t sector; |
58 | c163b5ca | lirans@il.ibm.com | struct iovec iov;
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59 | c163b5ca | lirans@il.ibm.com | QEMUIOVector qiov; |
60 | c163b5ca | lirans@il.ibm.com | BlockDriverAIOCB *aiocb; |
61 | c163b5ca | lirans@il.ibm.com | int ret;
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62 | 5e5328be | Jan Kiszka | QSIMPLEQ_ENTRY(BlkMigBlock) entry; |
63 | c163b5ca | lirans@il.ibm.com | } BlkMigBlock; |
64 | c163b5ca | lirans@il.ibm.com | |
65 | c163b5ca | lirans@il.ibm.com | typedef struct BlkMigState { |
66 | c163b5ca | lirans@il.ibm.com | int blk_enable;
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67 | c163b5ca | lirans@il.ibm.com | int shared_base;
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68 | 5e5328be | Jan Kiszka | QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list; |
69 | 5e5328be | Jan Kiszka | QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list; |
70 | c163b5ca | lirans@il.ibm.com | int submitted;
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71 | c163b5ca | lirans@il.ibm.com | int read_done;
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72 | c163b5ca | lirans@il.ibm.com | int transferred;
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73 | 82801d8f | Jan Kiszka | int64_t total_sector_sum; |
74 | 01e61e2d | Jan Kiszka | int prev_progress;
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75 | c163b5ca | lirans@il.ibm.com | } BlkMigState; |
76 | c163b5ca | lirans@il.ibm.com | |
77 | d11ecd3d | Jan Kiszka | static BlkMigState block_mig_state;
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78 | c163b5ca | lirans@il.ibm.com | |
79 | 13f0b67f | Jan Kiszka | static void blk_send(QEMUFile *f, BlkMigBlock * blk) |
80 | 13f0b67f | Jan Kiszka | { |
81 | 13f0b67f | Jan Kiszka | int len;
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82 | 13f0b67f | Jan Kiszka | |
83 | 13f0b67f | Jan Kiszka | /* sector number and flags */
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84 | 13f0b67f | Jan Kiszka | qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS) |
85 | 13f0b67f | Jan Kiszka | | BLK_MIG_FLAG_DEVICE_BLOCK); |
86 | 13f0b67f | Jan Kiszka | |
87 | 13f0b67f | Jan Kiszka | /* device name */
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88 | 13f0b67f | Jan Kiszka | len = strlen(blk->bmds->bs->device_name); |
89 | 13f0b67f | Jan Kiszka | qemu_put_byte(f, len); |
90 | 13f0b67f | Jan Kiszka | qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len); |
91 | 13f0b67f | Jan Kiszka | |
92 | 13f0b67f | Jan Kiszka | qemu_put_buffer(f, blk->buf, BLOCK_SIZE); |
93 | 13f0b67f | Jan Kiszka | } |
94 | 13f0b67f | Jan Kiszka | |
95 | 25f23643 | Jan Kiszka | int blk_mig_active(void) |
96 | 25f23643 | Jan Kiszka | { |
97 | 25f23643 | Jan Kiszka | return !QSIMPLEQ_EMPTY(&block_mig_state.bmds_list);
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98 | 25f23643 | Jan Kiszka | } |
99 | 25f23643 | Jan Kiszka | |
100 | 25f23643 | Jan Kiszka | uint64_t blk_mig_bytes_transferred(void)
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101 | 25f23643 | Jan Kiszka | { |
102 | 25f23643 | Jan Kiszka | BlkMigDevState *bmds; |
103 | 25f23643 | Jan Kiszka | uint64_t sum = 0;
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104 | 25f23643 | Jan Kiszka | |
105 | 25f23643 | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
106 | 25f23643 | Jan Kiszka | sum += bmds->completed_sectors; |
107 | 25f23643 | Jan Kiszka | } |
108 | 25f23643 | Jan Kiszka | return sum << BDRV_SECTOR_BITS;
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109 | 25f23643 | Jan Kiszka | } |
110 | 25f23643 | Jan Kiszka | |
111 | 25f23643 | Jan Kiszka | uint64_t blk_mig_bytes_remaining(void)
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112 | 25f23643 | Jan Kiszka | { |
113 | 25f23643 | Jan Kiszka | return blk_mig_bytes_total() - blk_mig_bytes_transferred();
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114 | 25f23643 | Jan Kiszka | } |
115 | 25f23643 | Jan Kiszka | |
116 | 25f23643 | Jan Kiszka | uint64_t blk_mig_bytes_total(void)
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117 | 25f23643 | Jan Kiszka | { |
118 | 25f23643 | Jan Kiszka | BlkMigDevState *bmds; |
119 | 25f23643 | Jan Kiszka | uint64_t sum = 0;
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120 | 25f23643 | Jan Kiszka | |
121 | 25f23643 | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
122 | 25f23643 | Jan Kiszka | sum += bmds->total_sectors; |
123 | 25f23643 | Jan Kiszka | } |
124 | 25f23643 | Jan Kiszka | return sum << BDRV_SECTOR_BITS;
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125 | 25f23643 | Jan Kiszka | } |
126 | 25f23643 | Jan Kiszka | |
127 | c163b5ca | lirans@il.ibm.com | static void blk_mig_read_cb(void *opaque, int ret) |
128 | c163b5ca | lirans@il.ibm.com | { |
129 | c163b5ca | lirans@il.ibm.com | BlkMigBlock *blk = opaque; |
130 | a55eb92c | Jan Kiszka | |
131 | c163b5ca | lirans@il.ibm.com | blk->ret = ret; |
132 | a55eb92c | Jan Kiszka | |
133 | 5e5328be | Jan Kiszka | QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry); |
134 | a55eb92c | Jan Kiszka | |
135 | d11ecd3d | Jan Kiszka | block_mig_state.submitted--; |
136 | d11ecd3d | Jan Kiszka | block_mig_state.read_done++; |
137 | d11ecd3d | Jan Kiszka | assert(block_mig_state.submitted >= 0);
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138 | c163b5ca | lirans@il.ibm.com | } |
139 | c163b5ca | lirans@il.ibm.com | |
140 | 7184049e | Jan Kiszka | static int mig_save_device_bulk(Monitor *mon, QEMUFile *f, |
141 | 7184049e | Jan Kiszka | BlkMigDevState *bmds, int is_async)
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142 | a55eb92c | Jan Kiszka | { |
143 | 57cce12d | Jan Kiszka | int64_t total_sectors = bmds->total_sectors; |
144 | 57cce12d | Jan Kiszka | int64_t cur_sector = bmds->cur_sector; |
145 | 57cce12d | Jan Kiszka | BlockDriverState *bs = bmds->bs; |
146 | c163b5ca | lirans@il.ibm.com | BlkMigBlock *blk; |
147 | 13f0b67f | Jan Kiszka | int nr_sectors;
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148 | a55eb92c | Jan Kiszka | |
149 | 57cce12d | Jan Kiszka | if (bmds->shared_base) {
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150 | b1d10856 | Jan Kiszka | while (cur_sector < total_sectors &&
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151 | 57cce12d | Jan Kiszka | !bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH, |
152 | 57cce12d | Jan Kiszka | &nr_sectors)) { |
153 | c163b5ca | lirans@il.ibm.com | cur_sector += nr_sectors; |
154 | c163b5ca | lirans@il.ibm.com | } |
155 | c163b5ca | lirans@il.ibm.com | } |
156 | a55eb92c | Jan Kiszka | |
157 | a55eb92c | Jan Kiszka | if (cur_sector >= total_sectors) {
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158 | 82801d8f | Jan Kiszka | bmds->cur_sector = bmds->completed_sectors = total_sectors; |
159 | c163b5ca | lirans@il.ibm.com | return 1; |
160 | c163b5ca | lirans@il.ibm.com | } |
161 | a55eb92c | Jan Kiszka | |
162 | 82801d8f | Jan Kiszka | bmds->completed_sectors = cur_sector; |
163 | a55eb92c | Jan Kiszka | |
164 | 57cce12d | Jan Kiszka | cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
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165 | 57cce12d | Jan Kiszka | |
166 | 6ea44308 | Jan Kiszka | /* we are going to transfer a full block even if it is not allocated */
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167 | 6ea44308 | Jan Kiszka | nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK; |
168 | c163b5ca | lirans@il.ibm.com | |
169 | 6ea44308 | Jan Kiszka | if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
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170 | 57cce12d | Jan Kiszka | nr_sectors = total_sectors - cur_sector; |
171 | c163b5ca | lirans@il.ibm.com | } |
172 | a55eb92c | Jan Kiszka | |
173 | 13f0b67f | Jan Kiszka | blk = qemu_malloc(sizeof(BlkMigBlock));
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174 | 13f0b67f | Jan Kiszka | blk->buf = qemu_malloc(BLOCK_SIZE); |
175 | 13f0b67f | Jan Kiszka | blk->bmds = bmds; |
176 | 13f0b67f | Jan Kiszka | blk->sector = cur_sector; |
177 | a55eb92c | Jan Kiszka | |
178 | 13f0b67f | Jan Kiszka | if (is_async) {
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179 | 57cce12d | Jan Kiszka | blk->iov.iov_base = blk->buf; |
180 | 57cce12d | Jan Kiszka | blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE; |
181 | 57cce12d | Jan Kiszka | qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
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182 | a55eb92c | Jan Kiszka | |
183 | 57cce12d | Jan Kiszka | blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov, |
184 | 57cce12d | Jan Kiszka | nr_sectors, blk_mig_read_cb, blk); |
185 | 57cce12d | Jan Kiszka | if (!blk->aiocb) {
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186 | 4b640365 | Jan Kiszka | goto error;
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187 | 57cce12d | Jan Kiszka | } |
188 | 57cce12d | Jan Kiszka | block_mig_state.submitted++; |
189 | 57cce12d | Jan Kiszka | } else {
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190 | 13f0b67f | Jan Kiszka | if (bdrv_read(bs, cur_sector, blk->buf, nr_sectors) < 0) { |
191 | 4b640365 | Jan Kiszka | goto error;
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192 | c163b5ca | lirans@il.ibm.com | } |
193 | 13f0b67f | Jan Kiszka | blk_send(f, blk); |
194 | a55eb92c | Jan Kiszka | |
195 | 13f0b67f | Jan Kiszka | qemu_free(blk->buf); |
196 | 13f0b67f | Jan Kiszka | qemu_free(blk); |
197 | c163b5ca | lirans@il.ibm.com | } |
198 | c163b5ca | lirans@il.ibm.com | |
199 | 13f0b67f | Jan Kiszka | bdrv_reset_dirty(bs, cur_sector, nr_sectors); |
200 | 13f0b67f | Jan Kiszka | bmds->cur_sector = cur_sector + nr_sectors; |
201 | a55eb92c | Jan Kiszka | |
202 | 13f0b67f | Jan Kiszka | return (bmds->cur_sector >= total_sectors);
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203 | 4b640365 | Jan Kiszka | |
204 | 4b640365 | Jan Kiszka | error:
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205 | 7184049e | Jan Kiszka | monitor_printf(mon, "Error reading sector %" PRId64 "\n", cur_sector); |
206 | 4b640365 | Jan Kiszka | qemu_file_set_error(f); |
207 | 4b640365 | Jan Kiszka | qemu_free(blk->buf); |
208 | 4b640365 | Jan Kiszka | qemu_free(blk); |
209 | 4b640365 | Jan Kiszka | return 0; |
210 | c163b5ca | lirans@il.ibm.com | } |
211 | c163b5ca | lirans@il.ibm.com | |
212 | c163b5ca | lirans@il.ibm.com | static void set_dirty_tracking(int enable) |
213 | c163b5ca | lirans@il.ibm.com | { |
214 | c163b5ca | lirans@il.ibm.com | BlkMigDevState *bmds; |
215 | 5e5328be | Jan Kiszka | |
216 | 5e5328be | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
217 | a55eb92c | Jan Kiszka | bdrv_set_dirty_tracking(bmds->bs, enable); |
218 | c163b5ca | lirans@il.ibm.com | } |
219 | c163b5ca | lirans@il.ibm.com | } |
220 | c163b5ca | lirans@il.ibm.com | |
221 | 7184049e | Jan Kiszka | static void init_blk_migration(Monitor *mon, QEMUFile *f) |
222 | c163b5ca | lirans@il.ibm.com | { |
223 | 5e5328be | Jan Kiszka | BlkMigDevState *bmds; |
224 | c163b5ca | lirans@il.ibm.com | BlockDriverState *bs; |
225 | 792773b2 | Jan Kiszka | int64_t sectors; |
226 | a55eb92c | Jan Kiszka | |
227 | 69d63a97 | Jan Kiszka | block_mig_state.submitted = 0;
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228 | 69d63a97 | Jan Kiszka | block_mig_state.read_done = 0;
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229 | 69d63a97 | Jan Kiszka | block_mig_state.transferred = 0;
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230 | 82801d8f | Jan Kiszka | block_mig_state.total_sector_sum = 0;
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231 | 01e61e2d | Jan Kiszka | block_mig_state.prev_progress = -1;
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232 | 69d63a97 | Jan Kiszka | |
233 | c163b5ca | lirans@il.ibm.com | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
234 | a55eb92c | Jan Kiszka | if (bs->type == BDRV_TYPE_HD) {
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235 | 792773b2 | Jan Kiszka | sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
236 | 792773b2 | Jan Kiszka | if (sectors == 0) { |
237 | 792773b2 | Jan Kiszka | continue;
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238 | 792773b2 | Jan Kiszka | } |
239 | 792773b2 | Jan Kiszka | |
240 | c163b5ca | lirans@il.ibm.com | bmds = qemu_mallocz(sizeof(BlkMigDevState));
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241 | c163b5ca | lirans@il.ibm.com | bmds->bs = bs; |
242 | c163b5ca | lirans@il.ibm.com | bmds->bulk_completed = 0;
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243 | 792773b2 | Jan Kiszka | bmds->total_sectors = sectors; |
244 | 82801d8f | Jan Kiszka | bmds->completed_sectors = 0;
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245 | d11ecd3d | Jan Kiszka | bmds->shared_base = block_mig_state.shared_base; |
246 | a55eb92c | Jan Kiszka | |
247 | 792773b2 | Jan Kiszka | block_mig_state.total_sector_sum += sectors; |
248 | 82801d8f | Jan Kiszka | |
249 | a55eb92c | Jan Kiszka | if (bmds->shared_base) {
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250 | 7184049e | Jan Kiszka | monitor_printf(mon, "Start migration for %s with shared base "
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251 | 7184049e | Jan Kiszka | "image\n",
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252 | 7184049e | Jan Kiszka | bs->device_name); |
253 | c163b5ca | lirans@il.ibm.com | } else {
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254 | 7184049e | Jan Kiszka | monitor_printf(mon, "Start full migration for %s\n",
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255 | 7184049e | Jan Kiszka | bs->device_name); |
256 | c163b5ca | lirans@il.ibm.com | } |
257 | a55eb92c | Jan Kiszka | |
258 | 5e5328be | Jan Kiszka | QSIMPLEQ_INSERT_TAIL(&block_mig_state.bmds_list, bmds, entry); |
259 | c163b5ca | lirans@il.ibm.com | } |
260 | a55eb92c | Jan Kiszka | } |
261 | c163b5ca | lirans@il.ibm.com | } |
262 | c163b5ca | lirans@il.ibm.com | |
263 | 7184049e | Jan Kiszka | static int blk_mig_save_bulked_block(Monitor *mon, QEMUFile *f, int is_async) |
264 | c163b5ca | lirans@il.ibm.com | { |
265 | 82801d8f | Jan Kiszka | int64_t completed_sector_sum = 0;
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266 | c163b5ca | lirans@il.ibm.com | BlkMigDevState *bmds; |
267 | 01e61e2d | Jan Kiszka | int progress;
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268 | 82801d8f | Jan Kiszka | int ret = 0; |
269 | c163b5ca | lirans@il.ibm.com | |
270 | 5e5328be | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
271 | a55eb92c | Jan Kiszka | if (bmds->bulk_completed == 0) { |
272 | 7184049e | Jan Kiszka | if (mig_save_device_bulk(mon, f, bmds, is_async) == 1) { |
273 | 57cce12d | Jan Kiszka | /* completed bulk section for this device */
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274 | 57cce12d | Jan Kiszka | bmds->bulk_completed = 1;
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275 | c163b5ca | lirans@il.ibm.com | } |
276 | 82801d8f | Jan Kiszka | completed_sector_sum += bmds->completed_sectors; |
277 | 82801d8f | Jan Kiszka | ret = 1;
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278 | 82801d8f | Jan Kiszka | break;
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279 | 82801d8f | Jan Kiszka | } else {
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280 | 82801d8f | Jan Kiszka | completed_sector_sum += bmds->completed_sectors; |
281 | c163b5ca | lirans@il.ibm.com | } |
282 | c163b5ca | lirans@il.ibm.com | } |
283 | a55eb92c | Jan Kiszka | |
284 | 01e61e2d | Jan Kiszka | progress = completed_sector_sum * 100 / block_mig_state.total_sector_sum;
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285 | 01e61e2d | Jan Kiszka | if (progress != block_mig_state.prev_progress) {
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286 | 01e61e2d | Jan Kiszka | block_mig_state.prev_progress = progress; |
287 | 01e61e2d | Jan Kiszka | qemu_put_be64(f, (progress << BDRV_SECTOR_BITS) |
288 | 01e61e2d | Jan Kiszka | | BLK_MIG_FLAG_PROGRESS); |
289 | 01e61e2d | Jan Kiszka | monitor_printf(mon, "Completed %d %%\r", progress);
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290 | 7184049e | Jan Kiszka | monitor_flush(mon); |
291 | 82801d8f | Jan Kiszka | } |
292 | 82801d8f | Jan Kiszka | |
293 | 82801d8f | Jan Kiszka | return ret;
|
294 | c163b5ca | lirans@il.ibm.com | } |
295 | c163b5ca | lirans@il.ibm.com | |
296 | c163b5ca | lirans@il.ibm.com | #define MAX_NUM_BLOCKS 4 |
297 | c163b5ca | lirans@il.ibm.com | |
298 | 7184049e | Jan Kiszka | static void blk_mig_save_dirty_blocks(Monitor *mon, QEMUFile *f) |
299 | c163b5ca | lirans@il.ibm.com | { |
300 | c163b5ca | lirans@il.ibm.com | BlkMigDevState *bmds; |
301 | 13f0b67f | Jan Kiszka | BlkMigBlock blk; |
302 | c163b5ca | lirans@il.ibm.com | int64_t sector; |
303 | a55eb92c | Jan Kiszka | |
304 | 13f0b67f | Jan Kiszka | blk.buf = qemu_malloc(BLOCK_SIZE); |
305 | 575a58d7 | Jan Kiszka | |
306 | 5e5328be | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
307 | a55eb92c | Jan Kiszka | for (sector = 0; sector < bmds->cur_sector;) { |
308 | a55eb92c | Jan Kiszka | if (bdrv_get_dirty(bmds->bs, sector)) {
|
309 | 13f0b67f | Jan Kiszka | if (bdrv_read(bmds->bs, sector, blk.buf,
|
310 | 6ea44308 | Jan Kiszka | BDRV_SECTORS_PER_DIRTY_CHUNK) < 0) {
|
311 | 7184049e | Jan Kiszka | monitor_printf(mon, "Error reading sector %" PRId64 "\n", |
312 | 7184049e | Jan Kiszka | sector); |
313 | 4b640365 | Jan Kiszka | qemu_file_set_error(f); |
314 | 4b640365 | Jan Kiszka | qemu_free(blk.buf); |
315 | 4b640365 | Jan Kiszka | return;
|
316 | c163b5ca | lirans@il.ibm.com | } |
317 | 13f0b67f | Jan Kiszka | blk.bmds = bmds; |
318 | 13f0b67f | Jan Kiszka | blk.sector = sector; |
319 | 13f0b67f | Jan Kiszka | blk_send(f, &blk); |
320 | a55eb92c | Jan Kiszka | |
321 | a55eb92c | Jan Kiszka | bdrv_reset_dirty(bmds->bs, sector, |
322 | 6ea44308 | Jan Kiszka | BDRV_SECTORS_PER_DIRTY_CHUNK); |
323 | a55eb92c | Jan Kiszka | } |
324 | 6ea44308 | Jan Kiszka | sector += BDRV_SECTORS_PER_DIRTY_CHUNK; |
325 | c163b5ca | lirans@il.ibm.com | } |
326 | c163b5ca | lirans@il.ibm.com | } |
327 | 575a58d7 | Jan Kiszka | |
328 | 13f0b67f | Jan Kiszka | qemu_free(blk.buf); |
329 | c163b5ca | lirans@il.ibm.com | } |
330 | c163b5ca | lirans@il.ibm.com | |
331 | c163b5ca | lirans@il.ibm.com | static void flush_blks(QEMUFile* f) |
332 | c163b5ca | lirans@il.ibm.com | { |
333 | 5e5328be | Jan Kiszka | BlkMigBlock *blk; |
334 | a55eb92c | Jan Kiszka | |
335 | d11ecd3d | Jan Kiszka | dprintf("%s Enter submitted %d read_done %d transferred %d\n",
|
336 | d11ecd3d | Jan Kiszka | __FUNCTION__, block_mig_state.submitted, block_mig_state.read_done, |
337 | d11ecd3d | Jan Kiszka | block_mig_state.transferred); |
338 | a55eb92c | Jan Kiszka | |
339 | 5e5328be | Jan Kiszka | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
340 | 5e5328be | Jan Kiszka | if (qemu_file_rate_limit(f)) {
|
341 | 5e5328be | Jan Kiszka | break;
|
342 | 5e5328be | Jan Kiszka | } |
343 | 4b640365 | Jan Kiszka | if (blk->ret < 0) { |
344 | 4b640365 | Jan Kiszka | qemu_file_set_error(f); |
345 | 4b640365 | Jan Kiszka | break;
|
346 | 4b640365 | Jan Kiszka | } |
347 | 13f0b67f | Jan Kiszka | blk_send(f, blk); |
348 | a55eb92c | Jan Kiszka | |
349 | 5e5328be | Jan Kiszka | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
350 | c163b5ca | lirans@il.ibm.com | qemu_free(blk->buf); |
351 | c163b5ca | lirans@il.ibm.com | qemu_free(blk); |
352 | a55eb92c | Jan Kiszka | |
353 | d11ecd3d | Jan Kiszka | block_mig_state.read_done--; |
354 | d11ecd3d | Jan Kiszka | block_mig_state.transferred++; |
355 | d11ecd3d | Jan Kiszka | assert(block_mig_state.read_done >= 0);
|
356 | c163b5ca | lirans@il.ibm.com | } |
357 | c163b5ca | lirans@il.ibm.com | |
358 | d11ecd3d | Jan Kiszka | dprintf("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
|
359 | d11ecd3d | Jan Kiszka | block_mig_state.submitted, block_mig_state.read_done, |
360 | d11ecd3d | Jan Kiszka | block_mig_state.transferred); |
361 | c163b5ca | lirans@il.ibm.com | } |
362 | c163b5ca | lirans@il.ibm.com | |
363 | c163b5ca | lirans@il.ibm.com | static int is_stage2_completed(void) |
364 | c163b5ca | lirans@il.ibm.com | { |
365 | c163b5ca | lirans@il.ibm.com | BlkMigDevState *bmds; |
366 | a55eb92c | Jan Kiszka | |
367 | d11ecd3d | Jan Kiszka | if (block_mig_state.submitted > 0) { |
368 | c163b5ca | lirans@il.ibm.com | return 0; |
369 | c163b5ca | lirans@il.ibm.com | } |
370 | a55eb92c | Jan Kiszka | |
371 | 5e5328be | Jan Kiszka | QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) { |
372 | a55eb92c | Jan Kiszka | if (bmds->bulk_completed == 0) { |
373 | c163b5ca | lirans@il.ibm.com | return 0; |
374 | c163b5ca | lirans@il.ibm.com | } |
375 | c163b5ca | lirans@il.ibm.com | } |
376 | a55eb92c | Jan Kiszka | |
377 | c163b5ca | lirans@il.ibm.com | return 1; |
378 | c163b5ca | lirans@il.ibm.com | } |
379 | c163b5ca | lirans@il.ibm.com | |
380 | 7184049e | Jan Kiszka | static void blk_mig_cleanup(Monitor *mon) |
381 | 4ec7fcc7 | Jan Kiszka | { |
382 | 82801d8f | Jan Kiszka | BlkMigDevState *bmds; |
383 | 82801d8f | Jan Kiszka | BlkMigBlock *blk; |
384 | 4ec7fcc7 | Jan Kiszka | |
385 | 82801d8f | Jan Kiszka | while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) { |
386 | 82801d8f | Jan Kiszka | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry); |
387 | 4ec7fcc7 | Jan Kiszka | qemu_free(bmds); |
388 | 4ec7fcc7 | Jan Kiszka | } |
389 | 4ec7fcc7 | Jan Kiszka | |
390 | 82801d8f | Jan Kiszka | while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) { |
391 | 82801d8f | Jan Kiszka | QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry); |
392 | 4ec7fcc7 | Jan Kiszka | qemu_free(blk->buf); |
393 | 4ec7fcc7 | Jan Kiszka | qemu_free(blk); |
394 | 4ec7fcc7 | Jan Kiszka | } |
395 | 4ec7fcc7 | Jan Kiszka | |
396 | 4ec7fcc7 | Jan Kiszka | set_dirty_tracking(0);
|
397 | 4ec7fcc7 | Jan Kiszka | |
398 | 7184049e | Jan Kiszka | monitor_printf(mon, "\n");
|
399 | 4ec7fcc7 | Jan Kiszka | } |
400 | 4ec7fcc7 | Jan Kiszka | |
401 | f327aa0c | Jan Kiszka | static int block_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) |
402 | c163b5ca | lirans@il.ibm.com | { |
403 | d11ecd3d | Jan Kiszka | dprintf("Enter save live stage %d submitted %d transferred %d\n",
|
404 | d11ecd3d | Jan Kiszka | stage, block_mig_state.submitted, block_mig_state.transferred); |
405 | a55eb92c | Jan Kiszka | |
406 | 4ec7fcc7 | Jan Kiszka | if (stage < 0) { |
407 | 7184049e | Jan Kiszka | blk_mig_cleanup(mon); |
408 | 4ec7fcc7 | Jan Kiszka | return 0; |
409 | 4ec7fcc7 | Jan Kiszka | } |
410 | 4ec7fcc7 | Jan Kiszka | |
411 | d11ecd3d | Jan Kiszka | if (block_mig_state.blk_enable != 1) { |
412 | c163b5ca | lirans@il.ibm.com | /* no need to migrate storage */
|
413 | a55eb92c | Jan Kiszka | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
414 | c163b5ca | lirans@il.ibm.com | return 1; |
415 | c163b5ca | lirans@il.ibm.com | } |
416 | a55eb92c | Jan Kiszka | |
417 | a55eb92c | Jan Kiszka | if (stage == 1) { |
418 | 7184049e | Jan Kiszka | init_blk_migration(mon, f); |
419 | a55eb92c | Jan Kiszka | |
420 | c163b5ca | lirans@il.ibm.com | /* start track dirty blocks */
|
421 | c163b5ca | lirans@il.ibm.com | set_dirty_tracking(1);
|
422 | c163b5ca | lirans@il.ibm.com | } |
423 | c163b5ca | lirans@il.ibm.com | |
424 | c163b5ca | lirans@il.ibm.com | flush_blks(f); |
425 | a55eb92c | Jan Kiszka | |
426 | 4b640365 | Jan Kiszka | if (qemu_file_has_error(f)) {
|
427 | 7184049e | Jan Kiszka | blk_mig_cleanup(mon); |
428 | 4b640365 | Jan Kiszka | return 0; |
429 | 4b640365 | Jan Kiszka | } |
430 | 4b640365 | Jan Kiszka | |
431 | c163b5ca | lirans@il.ibm.com | /* control the rate of transfer */
|
432 | d11ecd3d | Jan Kiszka | while ((block_mig_state.submitted +
|
433 | d11ecd3d | Jan Kiszka | block_mig_state.read_done) * BLOCK_SIZE < |
434 | a55eb92c | Jan Kiszka | qemu_file_get_rate_limit(f)) { |
435 | 7184049e | Jan Kiszka | if (blk_mig_save_bulked_block(mon, f, 1) == 0) { |
436 | a55eb92c | Jan Kiszka | /* no more bulk blocks for now */
|
437 | c163b5ca | lirans@il.ibm.com | break;
|
438 | a55eb92c | Jan Kiszka | } |
439 | c163b5ca | lirans@il.ibm.com | } |
440 | a55eb92c | Jan Kiszka | |
441 | c163b5ca | lirans@il.ibm.com | flush_blks(f); |
442 | a55eb92c | Jan Kiszka | |
443 | 4b640365 | Jan Kiszka | if (qemu_file_has_error(f)) {
|
444 | 7184049e | Jan Kiszka | blk_mig_cleanup(mon); |
445 | 4b640365 | Jan Kiszka | return 0; |
446 | 4b640365 | Jan Kiszka | } |
447 | 4b640365 | Jan Kiszka | |
448 | a55eb92c | Jan Kiszka | if (stage == 3) { |
449 | 7184049e | Jan Kiszka | while (blk_mig_save_bulked_block(mon, f, 0) != 0) { |
450 | a55eb92c | Jan Kiszka | /* empty */
|
451 | a55eb92c | Jan Kiszka | } |
452 | a55eb92c | Jan Kiszka | |
453 | 7184049e | Jan Kiszka | blk_mig_save_dirty_blocks(mon, f); |
454 | 7184049e | Jan Kiszka | blk_mig_cleanup(mon); |
455 | a55eb92c | Jan Kiszka | |
456 | 01e61e2d | Jan Kiszka | /* report completion */
|
457 | 01e61e2d | Jan Kiszka | qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
|
458 | 01e61e2d | Jan Kiszka | |
459 | 4b640365 | Jan Kiszka | if (qemu_file_has_error(f)) {
|
460 | 4b640365 | Jan Kiszka | return 0; |
461 | 4b640365 | Jan Kiszka | } |
462 | 4b640365 | Jan Kiszka | |
463 | 7184049e | Jan Kiszka | monitor_printf(mon, "Block migration completed\n");
|
464 | c163b5ca | lirans@il.ibm.com | } |
465 | a55eb92c | Jan Kiszka | |
466 | a55eb92c | Jan Kiszka | qemu_put_be64(f, BLK_MIG_FLAG_EOS); |
467 | a55eb92c | Jan Kiszka | |
468 | c163b5ca | lirans@il.ibm.com | return ((stage == 2) && is_stage2_completed()); |
469 | c163b5ca | lirans@il.ibm.com | } |
470 | c163b5ca | lirans@il.ibm.com | |
471 | c163b5ca | lirans@il.ibm.com | static int block_load(QEMUFile *f, void *opaque, int version_id) |
472 | c163b5ca | lirans@il.ibm.com | { |
473 | 01e61e2d | Jan Kiszka | static int banner_printed; |
474 | c163b5ca | lirans@il.ibm.com | int len, flags;
|
475 | c163b5ca | lirans@il.ibm.com | char device_name[256]; |
476 | c163b5ca | lirans@il.ibm.com | int64_t addr; |
477 | c163b5ca | lirans@il.ibm.com | BlockDriverState *bs; |
478 | c163b5ca | lirans@il.ibm.com | uint8_t *buf; |
479 | a55eb92c | Jan Kiszka | |
480 | c163b5ca | lirans@il.ibm.com | do {
|
481 | c163b5ca | lirans@il.ibm.com | addr = qemu_get_be64(f); |
482 | a55eb92c | Jan Kiszka | |
483 | 6ea44308 | Jan Kiszka | flags = addr & ~BDRV_SECTOR_MASK; |
484 | 6ea44308 | Jan Kiszka | addr >>= BDRV_SECTOR_BITS; |
485 | a55eb92c | Jan Kiszka | |
486 | a55eb92c | Jan Kiszka | if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
|
487 | c163b5ca | lirans@il.ibm.com | /* get device name */
|
488 | c163b5ca | lirans@il.ibm.com | len = qemu_get_byte(f); |
489 | c163b5ca | lirans@il.ibm.com | qemu_get_buffer(f, (uint8_t *)device_name, len); |
490 | c163b5ca | lirans@il.ibm.com | device_name[len] = '\0';
|
491 | a55eb92c | Jan Kiszka | |
492 | c163b5ca | lirans@il.ibm.com | bs = bdrv_find(device_name); |
493 | 4b640365 | Jan Kiszka | if (!bs) {
|
494 | 4b640365 | Jan Kiszka | fprintf(stderr, "Error unknown block device %s\n",
|
495 | 4b640365 | Jan Kiszka | device_name); |
496 | 4b640365 | Jan Kiszka | return -EINVAL;
|
497 | 4b640365 | Jan Kiszka | } |
498 | a55eb92c | Jan Kiszka | |
499 | 575a58d7 | Jan Kiszka | buf = qemu_malloc(BLOCK_SIZE); |
500 | 575a58d7 | Jan Kiszka | |
501 | a55eb92c | Jan Kiszka | qemu_get_buffer(f, buf, BLOCK_SIZE); |
502 | 4b640365 | Jan Kiszka | bdrv_write(bs, addr, buf, BDRV_SECTORS_PER_DIRTY_CHUNK); |
503 | 575a58d7 | Jan Kiszka | |
504 | 575a58d7 | Jan Kiszka | qemu_free(buf); |
505 | 01e61e2d | Jan Kiszka | } else if (flags & BLK_MIG_FLAG_PROGRESS) { |
506 | 01e61e2d | Jan Kiszka | if (!banner_printed) {
|
507 | 01e61e2d | Jan Kiszka | printf("Receiving block device images\n");
|
508 | 01e61e2d | Jan Kiszka | banner_printed = 1;
|
509 | 01e61e2d | Jan Kiszka | } |
510 | 01e61e2d | Jan Kiszka | printf("Completed %d %%%c", (int)addr, |
511 | 01e61e2d | Jan Kiszka | (addr == 100) ? '\n' : '\r'); |
512 | 01e61e2d | Jan Kiszka | fflush(stdout); |
513 | a55eb92c | Jan Kiszka | } else if (!(flags & BLK_MIG_FLAG_EOS)) { |
514 | 4b640365 | Jan Kiszka | fprintf(stderr, "Unknown flags\n");
|
515 | 4b640365 | Jan Kiszka | return -EINVAL;
|
516 | 4b640365 | Jan Kiszka | } |
517 | 4b640365 | Jan Kiszka | if (qemu_file_has_error(f)) {
|
518 | 4b640365 | Jan Kiszka | return -EIO;
|
519 | c163b5ca | lirans@il.ibm.com | } |
520 | a55eb92c | Jan Kiszka | } while (!(flags & BLK_MIG_FLAG_EOS));
|
521 | a55eb92c | Jan Kiszka | |
522 | c163b5ca | lirans@il.ibm.com | return 0; |
523 | c163b5ca | lirans@il.ibm.com | } |
524 | c163b5ca | lirans@il.ibm.com | |
525 | c163b5ca | lirans@il.ibm.com | static void block_set_params(int blk_enable, int shared_base, void *opaque) |
526 | c163b5ca | lirans@il.ibm.com | { |
527 | d11ecd3d | Jan Kiszka | block_mig_state.blk_enable = blk_enable; |
528 | d11ecd3d | Jan Kiszka | block_mig_state.shared_base = shared_base; |
529 | a55eb92c | Jan Kiszka | |
530 | c163b5ca | lirans@il.ibm.com | /* shared base means that blk_enable = 1 */
|
531 | d11ecd3d | Jan Kiszka | block_mig_state.blk_enable |= shared_base; |
532 | c163b5ca | lirans@il.ibm.com | } |
533 | c163b5ca | lirans@il.ibm.com | |
534 | c163b5ca | lirans@il.ibm.com | void blk_mig_init(void) |
535 | a55eb92c | Jan Kiszka | { |
536 | 5e5328be | Jan Kiszka | QSIMPLEQ_INIT(&block_mig_state.bmds_list); |
537 | 5e5328be | Jan Kiszka | QSIMPLEQ_INIT(&block_mig_state.blk_list); |
538 | 5e5328be | Jan Kiszka | |
539 | a55eb92c | Jan Kiszka | register_savevm_live("block", 0, 1, block_set_params, block_save_live, |
540 | d11ecd3d | Jan Kiszka | NULL, block_load, &block_mig_state);
|
541 | c163b5ca | lirans@il.ibm.com | } |