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