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/*
* Multifd common functions
*
* Copyright (c) 2019-2020 Red Hat Inc
*
* Authors:
* Juan Quintela <quintela@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_MIGRATION_MULTIFD_H
#define QEMU_MIGRATION_MULTIFD_H
int multifd_save_setup(Error **errp);
void multifd_save_cleanup(void);
int multifd_load_setup(Error **errp);
int multifd_load_cleanup(Error **errp);
bool multifd_recv_all_channels_created(void);
bool multifd_recv_new_channel(QIOChannel *ioc, Error **errp);
void multifd_recv_sync_main(void);
void multifd_send_sync_main(QEMUFile *f);
int multifd_queue_page(QEMUFile *f, RAMBlock *block, ram_addr_t offset);
/* Multifd Compression flags */
#define MULTIFD_FLAG_SYNC (1 << 0)
/* We reserve 3 bits for compression methods */
#define MULTIFD_FLAG_COMPRESSION_MASK (7 << 1)
/* we need to be compatible. Before compression value was 0 */
#define MULTIFD_FLAG_NOCOMP (0 << 1)
#define MULTIFD_FLAG_ZLIB (1 << 1)
#define MULTIFD_FLAG_ZSTD (2 << 1)
/* This value needs to be a multiple of qemu_target_page_size() */
#define MULTIFD_PACKET_SIZE (512 * 1024)
typedef struct {
uint32_t magic;
uint32_t version;
uint32_t flags;
/* maximum number of allocated pages */
uint32_t pages_alloc;
uint32_t pages_used;
/* size of the next packet that contains pages */
uint32_t next_packet_size;
uint64_t packet_num;
uint64_t unused[4]; /* Reserved for future use */
char ramblock[256];
uint64_t offset[];
} __attribute__((packed)) MultiFDPacket_t;
typedef struct {
/* number of used pages */
uint32_t used;
/* number of allocated pages */
uint32_t allocated;
/* global number of generated multifd packets */
uint64_t packet_num;
/* offset of each page */
ram_addr_t *offset;
/* pointer to each page */
struct iovec *iov;
RAMBlock *block;
} MultiFDPages_t;
typedef struct {
/* this fields are not changed once the thread is created */
/* channel number */
uint8_t id;
/* channel thread name */
char *name;
/* channel thread id */
QemuThread thread;
/* communication channel */
QIOChannel *c;
/* sem where to wait for more work */
QemuSemaphore sem;
/* this mutex protects the following parameters */
QemuMutex mutex;
/* is this channel thread running */
bool running;
/* should this thread finish */
bool quit;
/* thread has work to do */
int pending_job;
/* array of pages to sent */
MultiFDPages_t *pages;
/* packet allocated len */
uint32_t packet_len;
/* pointer to the packet */
MultiFDPacket_t *packet;
/* multifd flags for each packet */
uint32_t flags;
/* size of the next packet that contains pages */
uint32_t next_packet_size;
/* global number of generated multifd packets */
uint64_t packet_num;
/* thread local variables */
/* packets sent through this channel */
uint64_t num_packets;
/* pages sent through this channel */
uint64_t num_pages;
/* syncs main thread and channels */
QemuSemaphore sem_sync;
/* used for compression methods */
void *data;
} MultiFDSendParams;
typedef struct {
/* this fields are not changed once the thread is created */
/* channel number */
uint8_t id;
/* channel thread name */
char *name;
/* channel thread id */
QemuThread thread;
/* communication channel */
QIOChannel *c;
/* this mutex protects the following parameters */
QemuMutex mutex;
/* is this channel thread running */
bool running;
/* should this thread finish */
bool quit;
/* array of pages to receive */
MultiFDPages_t *pages;
/* packet allocated len */
uint32_t packet_len;
/* pointer to the packet */
MultiFDPacket_t *packet;
/* multifd flags for each packet */
uint32_t flags;
/* global number of generated multifd packets */
uint64_t packet_num;
/* thread local variables */
/* size of the next packet that contains pages */
uint32_t next_packet_size;
/* packets sent through this channel */
uint64_t num_packets;
/* pages sent through this channel */
uint64_t num_pages;
/* syncs main thread and channels */
QemuSemaphore sem_sync;
/* used for de-compression methods */
void *data;
} MultiFDRecvParams;
typedef struct {
/* Setup for sending side */
int (*send_setup)(MultiFDSendParams *p, Error **errp);
/* Cleanup for sending side */
void (*send_cleanup)(MultiFDSendParams *p, Error **errp);
/* Prepare the send packet */
int (*send_prepare)(MultiFDSendParams *p, uint32_t used, Error **errp);
/* Write the send packet */
int (*send_write)(MultiFDSendParams *p, uint32_t used, Error **errp);
/* Setup for receiving side */
int (*recv_setup)(MultiFDRecvParams *p, Error **errp);
/* Cleanup for receiving side */
void (*recv_cleanup)(MultiFDRecvParams *p);
/* Read all pages */
int (*recv_pages)(MultiFDRecvParams *p, uint32_t used, Error **errp);
} MultiFDMethods;
void multifd_register_ops(int method, MultiFDMethods *ops);
#endif
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