4951f65bd3
Implement migration via unix sockets. While you can fake this using exec and netcat, this involves forking another process and is generally not very nice. By doing this directly in qemu, we can avoid the copy through the external nc command. This is useful for implementations (such as libvirt) that want to do "secure" migration; we pipe the data on the sending side into the unix socket, libvirt picks it up, encrypts it, and transports it, and then on the remote side libvirt decrypts it, dumps it to another unix socket, and feeds it into qemu. The implementation is straightforward and looks very similar to migration-exec.c and migration-tcp.c Signed-off-by: Chris Lalancette <clalance@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_MIGRATION_H
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#define QEMU_MIGRATION_H
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#include "qemu-common.h"
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#define MIG_STATE_ERROR -1
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#define MIG_STATE_COMPLETED 0
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#define MIG_STATE_CANCELLED 1
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#define MIG_STATE_ACTIVE 2
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typedef struct MigrationState MigrationState;
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struct MigrationState
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{
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/* FIXME: add more accessors to print migration info */
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void (*cancel)(MigrationState *s);
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int (*get_status)(MigrationState *s);
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void (*release)(MigrationState *s);
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};
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typedef struct FdMigrationState FdMigrationState;
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struct FdMigrationState
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{
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MigrationState mig_state;
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int64_t bandwidth_limit;
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QEMUFile *file;
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int fd;
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Monitor *mon_resume;
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int state;
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int (*get_error)(struct FdMigrationState*);
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int (*close)(struct FdMigrationState*);
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int (*write)(struct FdMigrationState*, const void *, size_t);
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void *opaque;
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};
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void qemu_start_incoming_migration(const char *uri);
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void do_migrate(Monitor *mon, int detach, const char *uri);
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void do_migrate_cancel(Monitor *mon);
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void do_migrate_set_speed(Monitor *mon, const char *value);
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uint64_t migrate_max_downtime(void);
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void do_migrate_set_downtime(Monitor *mon, const char *value);
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void do_info_migrate(Monitor *mon);
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int exec_start_incoming_migration(const char *host_port);
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MigrationState *exec_start_outgoing_migration(const char *host_port,
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int64_t bandwidth_limit,
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int detach);
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int tcp_start_incoming_migration(const char *host_port);
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MigrationState *tcp_start_outgoing_migration(const char *host_port,
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int64_t bandwidth_limit,
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int detach);
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int unix_start_incoming_migration(const char *path);
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MigrationState *unix_start_outgoing_migration(const char *path,
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int64_t bandwidth_limit,
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int detach);
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void migrate_fd_monitor_suspend(FdMigrationState *s);
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void migrate_fd_error(FdMigrationState *s);
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void migrate_fd_cleanup(FdMigrationState *s);
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void migrate_fd_put_notify(void *opaque);
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ssize_t migrate_fd_put_buffer(void *opaque, const void *data, size_t size);
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void migrate_fd_connect(FdMigrationState *s);
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void migrate_fd_put_ready(void *opaque);
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int migrate_fd_get_status(MigrationState *mig_state);
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void migrate_fd_cancel(MigrationState *mig_state);
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void migrate_fd_release(MigrationState *mig_state);
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void migrate_fd_wait_for_unfreeze(void *opaque);
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int migrate_fd_close(void *opaque);
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static inline FdMigrationState *migrate_to_fms(MigrationState *mig_state)
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{
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return container_of(mig_state, FdMigrationState, mig_state);
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}
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#endif
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