migration/multifd.h

   1 /*
   2  * Multifd common functions
   3  *
   4  * Copyright (c) 2019-2020 Red Hat Inc
   5  *
   6  * Authors:
   7  *  Juan Quintela <quintela@redhat.com>
   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     /* non zero pages */
  46     uint32_t normal_pages;
  47     /* size of the next packet that contains pages */
  48     uint32_t next_packet_size;
  49     uint64_t packet_num;
  50     uint64_t unused[4];    /* Reserved for future use */
  51     char ramblock[256];
  52     uint64_t offset[];
  53 } __attribute__((packed)) MultiFDPacket_t;
  54
  55 typedef struct {
  56     /* number of used pages */
  57     uint32_t num;
  58     /* number of allocated pages */
  59     uint32_t allocated;
  60     /* global number of generated multifd packets */
  61     uint64_t packet_num;
  62     /* offset of each page */
  63     ram_addr_t *offset;
  64     RAMBlock *block;
  65 } MultiFDPages_t;
  66
  67 typedef struct {
  68     /* this fields are not changed once the thread is created */
  69     /* channel number */
  70     uint8_t id;
  71     /* channel thread name */
  72     char *name;
  73     /* channel thread id */
  74     QemuThread thread;
  75     /* communication channel */
  76     QIOChannel *c;
  77     /* sem where to wait for more work */
  78     QemuSemaphore sem;
  79     /* this mutex protects the following parameters */
  80     QemuMutex mutex;
  81     /* is this channel thread running */
  82     bool running;
  83     /* should this thread finish */
  84     bool quit;
  85     /* is the yank function registered */
  86     bool registered_yank;
  87     /* thread has work to do */
  88     int pending_job;
  89     /* array of pages to sent */
  90     MultiFDPages_t *pages;
  91     /* packet allocated len */
  92     uint32_t packet_len;
  93     /* pointer to the packet */
  94     MultiFDPacket_t *packet;
  95     /* multifd flags for each packet */
  96     uint32_t flags;
  97     /* size of the next packet that contains pages */
  98     uint32_t next_packet_size;
  99     /* global number of generated multifd packets */
 100     uint64_t packet_num;
 101     /* thread local variables */
 102     /* packets sent through this channel */
 103     uint64_t num_packets;
 104     /* non zero pages sent through this channel */
 105     uint64_t total_normal_pages;
 106     /* syncs main thread and channels */
 107     QemuSemaphore sem_sync;
 108     /* buffers to send */
 109     struct iovec *iov;
 110     /* number of iovs used */
 111     uint32_t iovs_num;
 112     /* Pages that are not zero */
 113     ram_addr_t *normal;
 114     /* num of non zero pages */
 115     uint32_t normal_num;
 116     /* used for compression methods */
 117     void *data;
 118 }  MultiFDSendParams;
 119
 120 typedef struct {
 121     /* this fields are not changed once the thread is created */
 122     /* channel number */
 123     uint8_t id;
 124     /* channel thread name */
 125     char *name;
 126     /* channel thread id */
 127     QemuThread thread;
 128     /* communication channel */
 129     QIOChannel *c;
 130     /* this mutex protects the following parameters */
 131     QemuMutex mutex;
 132     /* is this channel thread running */
 133     bool running;
 134     /* should this thread finish */
 135     bool quit;
 136     /* ramblock host address */
 137     uint8_t *host;
 138     /* packet allocated len */
 139     uint32_t packet_len;
 140     /* pointer to the packet */
 141     MultiFDPacket_t *packet;
 142     /* multifd flags for each packet */
 143     uint32_t flags;
 144     /* global number of generated multifd packets */
 145     uint64_t packet_num;
 146     /* thread local variables */
 147     /* size of the next packet that contains pages */
 148     uint32_t next_packet_size;
 149     /* packets sent through this channel */
 150     uint64_t num_packets;
 151     /* non zero pages recv through this channel */
 152     uint64_t total_normal_pages;
 153     /* syncs main thread and channels */
 154     QemuSemaphore sem_sync;
 155     /* buffers to recv */
 156     struct iovec *iov;
 157     /* Pages that are not zero */
 158     ram_addr_t *normal;
 159     /* num of non zero pages */
 160     uint32_t normal_num;
 161     /* used for de-compression methods */
 162     void *data;
 163 } MultiFDRecvParams;
 164
 165 typedef struct {
 166     /* Setup for sending side */
 167     int (*send_setup)(MultiFDSendParams *p, Error **errp);
 168     /* Cleanup for sending side */
 169     void (*send_cleanup)(MultiFDSendParams *p, Error **errp);
 170     /* Prepare the send packet */
 171     int (*send_prepare)(MultiFDSendParams *p, Error **errp);
 172     /* Setup for receiving side */
 173     int (*recv_setup)(MultiFDRecvParams *p, Error **errp);
 174     /* Cleanup for receiving side */
 175     void (*recv_cleanup)(MultiFDRecvParams *p);
 176     /* Read all pages */
 177     int (*recv_pages)(MultiFDRecvParams *p, Error **errp);
 178 } MultiFDMethods;
 179
 180 void multifd_register_ops(int method, MultiFDMethods *ops);
 181
 182 #endif
 183