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1 | /* | |
2 | * Multifd common functions | |
3 | * | |
4 | * Copyright (c) 2019-2020 Red Hat Inc | |
5 | * | |
6 | * Authors: | |
7 | * Juan Quintela <[email protected]> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
13 | #ifndef QEMU_MIGRATION_MULTIFD_H | |
14 | #define QEMU_MIGRATION_MULTIFD_H | |
15 | ||
16 | int multifd_save_setup(Error **errp); | |
17 | void multifd_save_cleanup(void); | |
18 | int multifd_load_setup(Error **errp); | |
19 | int multifd_load_cleanup(Error **errp); | |
20 | bool multifd_recv_all_channels_created(void); | |
21 | bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp); | |
22 | void multifd_recv_sync_main(void); | |
23 | void multifd_send_sync_main(QEMUFile *f); | |
24 | int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset); | |
25 | ||
26 | /* Multifd Compression flags */ | |
27 | #define MULTIFD_FLAG_SYNC (1 << 0) | |
28 | ||
29 | /* We reserve 3 bits for compression methods */ | |
30 | #define MULTIFD_FLAG_COMPRESSION_MASK (7 << 1) | |
31 | /* we need to be compatible. Before compression value was 0 */ | |
32 | #define MULTIFD_FLAG_NOCOMP (0 << 1) | |
33 | #define MULTIFD_FLAG_ZLIB (1 << 1) | |
34 | #define MULTIFD_FLAG_ZSTD (2 << 1) | |
35 | ||
36 | /* This value needs to be a multiple of qemu_target_page_size() */ | |
37 | #define MULTIFD_PACKET_SIZE (512 * 1024) | |
38 | ||
39 | typedef struct { | |
40 | uint32_t magic; | |
41 | uint32_t version; | |
42 | uint32_t flags; | |
43 | /* maximum number of allocated pages */ | |
44 | uint32_t pages_alloc; | |
45 | uint32_t pages_used; | |
46 | /* size of the next packet that contains pages */ | |
47 | uint32_t next_packet_size; | |
48 | uint64_t packet_num; | |
49 | uint64_t unused[4]; /* Reserved for future use */ | |
50 | char ramblock[256]; | |
51 | uint64_t offset[]; | |
52 | } __attribute__((packed)) MultiFDPacket_t; | |
53 | ||
54 | typedef struct { | |
55 | /* number of used pages */ | |
56 | uint32_t used; | |
57 | /* number of allocated pages */ | |
58 | uint32_t allocated; | |
59 | /* global number of generated multifd packets */ | |
60 | uint64_t packet_num; | |
61 | /* offset of each page */ | |
62 | ram_addr_t *offset; | |
63 | /* pointer to each page */ | |
64 | struct iovec *iov; | |
65 | RAMBlock *block; | |
66 | } MultiFDPages_t; | |
67 | ||
68 | typedef struct { | |
69 | /* this fields are not changed once the thread is created */ | |
70 | /* channel number */ | |
71 | uint8_t id; | |
72 | /* channel thread name */ | |
73 | char *name; | |
74 | /* channel thread id */ | |
75 | QemuThread thread; | |
76 | /* communication channel */ | |
77 | QIOChannel *c; | |
78 | /* sem where to wait for more work */ | |
79 | QemuSemaphore sem; | |
80 | /* this mutex protects the following parameters */ | |
81 | QemuMutex mutex; | |
82 | /* is this channel thread running */ | |
83 | bool running; | |
84 | /* should this thread finish */ | |
85 | bool quit; | |
86 | /* thread has work to do */ | |
87 | int pending_job; | |
88 | /* array of pages to sent */ | |
89 | MultiFDPages_t *pages; | |
90 | /* packet allocated len */ | |
91 | uint32_t packet_len; | |
92 | /* pointer to the packet */ | |
93 | MultiFDPacket_t *packet; | |
94 | /* multifd flags for each packet */ | |
95 | uint32_t flags; | |
96 | /* size of the next packet that contains pages */ | |
97 | uint32_t next_packet_size; | |
98 | /* global number of generated multifd packets */ | |
99 | uint64_t packet_num; | |
100 | /* thread local variables */ | |
101 | /* packets sent through this channel */ | |
102 | uint64_t num_packets; | |
103 | /* pages sent through this channel */ | |
104 | uint64_t num_pages; | |
105 | /* syncs main thread and channels */ | |
106 | QemuSemaphore sem_sync; | |
107 | /* used for compression methods */ | |
108 | void *data; | |
109 | } MultiFDSendParams; | |
110 | ||
111 | typedef struct { | |
112 | /* this fields are not changed once the thread is created */ | |
113 | /* channel number */ | |
114 | uint8_t id; | |
115 | /* channel thread name */ | |
116 | char *name; | |
117 | /* channel thread id */ | |
118 | QemuThread thread; | |
119 | /* communication channel */ | |
120 | QIOChannel *c; | |
121 | /* this mutex protects the following parameters */ | |
122 | QemuMutex mutex; | |
123 | /* is this channel thread running */ | |
124 | bool running; | |
125 | /* should this thread finish */ | |
126 | bool quit; | |
127 | /* array of pages to receive */ | |
128 | MultiFDPages_t *pages; | |
129 | /* packet allocated len */ | |
130 | uint32_t packet_len; | |
131 | /* pointer to the packet */ | |
132 | MultiFDPacket_t *packet; | |
133 | /* multifd flags for each packet */ | |
134 | uint32_t flags; | |
135 | /* global number of generated multifd packets */ | |
136 | uint64_t packet_num; | |
137 | /* thread local variables */ | |
138 | /* size of the next packet that contains pages */ | |
139 | uint32_t next_packet_size; | |
140 | /* packets sent through this channel */ | |
141 | uint64_t num_packets; | |
142 | /* pages sent through this channel */ | |
143 | uint64_t num_pages; | |
144 | /* syncs main thread and channels */ | |
145 | QemuSemaphore sem_sync; | |
146 | /* used for de-compression methods */ | |
147 | void *data; | |
148 | } MultiFDRecvParams; | |
149 | ||
150 | typedef struct { | |
151 | /* Setup for sending side */ | |
152 | int (*send_setup)(MultiFDSendParams *p, Error **errp); | |
153 | /* Cleanup for sending side */ | |
154 | void (*send_cleanup)(MultiFDSendParams *p, Error **errp); | |
155 | /* Prepare the send packet */ | |
156 | int (*send_prepare)(MultiFDSendParams *p, uint32_t used, Error **errp); | |
157 | /* Write the send packet */ | |
158 | int (*send_write)(MultiFDSendParams *p, uint32_t used, Error **errp); | |
159 | /* Setup for receiving side */ | |
160 | int (*recv_setup)(MultiFDRecvParams *p, Error **errp); | |
161 | /* Cleanup for receiving side */ | |
162 | void (*recv_cleanup)(MultiFDRecvParams *p); | |
163 | /* Read all pages */ | |
164 | int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp); | |
165 | } MultiFDMethods; | |
166 | ||
167 | void multifd_register_ops(int method, MultiFDMethods *ops); | |
168 | ||
169 | #endif | |
170 |