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f37afb5ab1
Error propagation is already there for socket backends. Add it to other
protocols, simplifying code that tests for errors that will never happen.
With all protocols understanding Error, the code can be simplified
further by removing the return value.
Unfortunately, the quality of error messages varies depending
on where the error is detected, because no Error is passed to the
NonBlockingConnectHandler. Thus, the exact error message still cannot
be sent to the user if the OS reports it asynchronously via SO_ERROR.
If NonBlockingConnectHandler received an Error**, we could for
example report the error class and/or message via a new field of the
query-migration command even if it is reported asynchronously.
Before:
(qemu) migrate fd:ffff
migrate: An undefined error has occurred
(qemu) info migrate
(qemu)
After:
(qemu) migrate fd:ffff
migrate: File descriptor named 'ffff' has not been found
(qemu) info migrate
capabilities: xbzrle: off
Migration status: failed
total time: 0 milliseconds
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
132 lines
3.6 KiB
C
132 lines
3.6 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 "qdict.h"
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#include "qemu-common.h"
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#include "notify.h"
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#include "error.h"
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#include "vmstate.h"
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#include "qapi-types.h"
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struct MigrationParams {
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bool blk;
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bool shared;
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};
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typedef struct MigrationState MigrationState;
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struct MigrationState
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{
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int64_t bandwidth_limit;
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QEMUFile *file;
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int fd;
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int state;
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int (*get_error)(MigrationState *s);
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int (*close)(MigrationState *s);
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int (*write)(MigrationState *s, const void *buff, size_t size);
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void *opaque;
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MigrationParams params;
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int64_t total_time;
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int64_t downtime;
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int64_t expected_downtime;
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int64_t dirty_pages_rate;
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bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
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int64_t xbzrle_cache_size;
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};
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void process_incoming_migration(QEMUFile *f);
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int qemu_start_incoming_migration(const char *uri, Error **errp);
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uint64_t migrate_max_downtime(void);
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void do_info_migrate_print(Monitor *mon, const QObject *data);
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void do_info_migrate(Monitor *mon, QObject **ret_data);
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int exec_start_incoming_migration(const char *host_port);
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void exec_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
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int tcp_start_incoming_migration(const char *host_port, Error **errp);
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void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp);
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int unix_start_incoming_migration(const char *path, Error **errp);
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void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp);
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int fd_start_incoming_migration(const char *path);
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void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp);
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void migrate_fd_error(MigrationState *s);
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void migrate_fd_connect(MigrationState *s);
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ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
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size_t size);
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void migrate_fd_put_ready(MigrationState *s);
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int migrate_fd_wait_for_unfreeze(MigrationState *s);
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int migrate_fd_close(MigrationState *s);
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void add_migration_state_change_notifier(Notifier *notify);
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void remove_migration_state_change_notifier(Notifier *notify);
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bool migration_is_active(MigrationState *);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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MigrationState *migrate_get_current(void);
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uint64_t ram_bytes_remaining(void);
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uint64_t ram_bytes_transferred(void);
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uint64_t ram_bytes_total(void);
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extern SaveVMHandlers savevm_ram_handlers;
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uint64_t dup_mig_bytes_transferred(void);
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uint64_t dup_mig_pages_transferred(void);
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uint64_t norm_mig_bytes_transferred(void);
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uint64_t norm_mig_pages_transferred(void);
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uint64_t xbzrle_mig_bytes_transferred(void);
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uint64_t xbzrle_mig_pages_transferred(void);
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uint64_t xbzrle_mig_pages_overflow(void);
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uint64_t xbzrle_mig_pages_cache_miss(void);
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/**
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* @migrate_add_blocker - prevent migration from proceeding
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*
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* @reason - an error to be returned whenever migration is attempted
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*/
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void migrate_add_blocker(Error *reason);
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/**
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* @migrate_del_blocker - remove a blocking error from migration
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*
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* @reason - the error blocking migration
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*/
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void migrate_del_blocker(Error *reason);
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int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
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uint8_t *dst, int dlen);
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int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
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int migrate_use_xbzrle(void);
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int64_t migrate_xbzrle_cache_size(void);
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int64_t xbzrle_cache_resize(int64_t new_size);
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#endif
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