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1d48111601
Add a savevm handler for a module to opt-in sending extra sections right before postcopy starts, and before VM is stopped. RAM will start to use this new savevm handler in the next patch to do flush and sync for multifd pages. Note that we choose to do it before VM stopped because the current only potential user is not sensitive to VM status, so doing it before VM is stopped is preferred to enlarge any postcopy downtime. It is still a bit unfortunate that we need to introduce such a new savevm handler just for the only use case, however it's so far the cleanest. Signed-off-by: Peter Xu <peterx@redhat.com> Signed-off-by: Prasad Pandit <pjp@fedoraproject.org> Reviewed-by: Fabiano Rosas <farosas@suse.de> Message-ID: <20250411114534.3370816-4-ppandit@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de>
79 lines
3.2 KiB
C
79 lines
3.2 KiB
C
/*
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* QEMU save vm functions
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2009-2017 Red Hat Inc
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*
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* Authors:
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* Juan Quintela <quintela@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef MIGRATION_SAVEVM_H
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#define MIGRATION_SAVEVM_H
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#define QEMU_VM_FILE_MAGIC 0x5145564d
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#define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
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#define QEMU_VM_FILE_VERSION 0x00000003
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#define QEMU_VM_EOF 0x00
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#define QEMU_VM_SECTION_START 0x01
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#define QEMU_VM_SECTION_PART 0x02
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#define QEMU_VM_SECTION_END 0x03
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#define QEMU_VM_SECTION_FULL 0x04
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#define QEMU_VM_SUBSECTION 0x05
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#define QEMU_VM_VMDESCRIPTION 0x06
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#define QEMU_VM_CONFIGURATION 0x07
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#define QEMU_VM_COMMAND 0x08
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#define QEMU_VM_SECTION_FOOTER 0x7e
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bool qemu_savevm_state_blocked(Error **errp);
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void qemu_savevm_non_migratable_list(strList **reasons);
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int qemu_savevm_state_prepare(Error **errp);
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int qemu_savevm_state_setup(QEMUFile *f, Error **errp);
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bool qemu_savevm_state_guest_unplug_pending(void);
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int qemu_savevm_state_resume_prepare(MigrationState *s);
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void qemu_savevm_state_header(QEMUFile *f);
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int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy);
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void qemu_savevm_state_cleanup(void);
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void qemu_savevm_state_complete_postcopy(QEMUFile *f);
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int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only);
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void qemu_savevm_state_pending_exact(uint64_t *must_precopy,
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uint64_t *can_postcopy);
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void qemu_savevm_state_pending_estimate(uint64_t *must_precopy,
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uint64_t *can_postcopy);
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int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy);
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bool qemu_savevm_state_postcopy_prepare(QEMUFile *f, Error **errp);
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void qemu_savevm_send_ping(QEMUFile *f, uint32_t value);
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void qemu_savevm_send_open_return_path(QEMUFile *f);
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int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len);
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void qemu_savevm_send_postcopy_advise(QEMUFile *f);
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void qemu_savevm_send_postcopy_listen(QEMUFile *f);
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void qemu_savevm_send_postcopy_run(QEMUFile *f);
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void qemu_savevm_send_postcopy_resume(QEMUFile *f);
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void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name);
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void qemu_savevm_maybe_send_switchover_start(QEMUFile *f);
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void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,
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uint16_t len,
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uint64_t *start_list,
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uint64_t *length_list);
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void qemu_savevm_send_colo_enable(QEMUFile *f);
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void qemu_savevm_live_state(QEMUFile *f);
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int qemu_save_device_state(QEMUFile *f);
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int qemu_loadvm_state(QEMUFile *f);
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void qemu_loadvm_state_cleanup(MigrationIncomingState *mis);
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int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis);
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int qemu_load_device_state(QEMUFile *f);
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int qemu_loadvm_approve_switchover(void);
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int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
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bool in_postcopy);
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bool qemu_loadvm_load_state_buffer(const char *idstr, uint32_t instance_id,
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char *buf, size_t len, Error **errp);
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#endif
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