1b4adb10f8
Implement switchover ack logic. This prevents the source from stopping the VM and completing the migration until an ACK is received from the destination that it's OK to do so. To achieve this, a new SaveVMHandlers handler switchover_ack_needed() and a new return path message MIG_RP_MSG_SWITCHOVER_ACK are added. The switchover_ack_needed() handler is called during migration setup in the destination to check if switchover ack is used by the migrated device. When switchover is approved by all migrated devices in the destination that support this capability, the MIG_RP_MSG_SWITCHOVER_ACK return path message is sent to the source to notify it that it's OK to do switchover. Signed-off-by: Avihai Horon <avihaih@nvidia.com> Reviewed-by: Peter Xu <peterx@redhat.com> Tested-by: YangHang Liu <yanghliu@redhat.com> Acked-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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* QEMU migration vmstate registration
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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 MIGRATION_REGISTER_H
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#define MIGRATION_REGISTER_H
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#include "hw/vmstate-if.h"
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typedef struct SaveVMHandlers {
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/* This runs inside the iothread lock. */
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SaveStateHandler *save_state;
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void (*save_cleanup)(void *opaque);
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int (*save_live_complete_postcopy)(QEMUFile *f, void *opaque);
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int (*save_live_complete_precopy)(QEMUFile *f, void *opaque);
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/* This runs both outside and inside the iothread lock. */
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bool (*is_active)(void *opaque);
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bool (*has_postcopy)(void *opaque);
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/* is_active_iterate
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* If it is not NULL then qemu_savevm_state_iterate will skip iteration if
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* it returns false. For example, it is needed for only-postcopy-states,
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* which needs to be handled by qemu_savevm_state_setup and
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* qemu_savevm_state_pending, but do not need iterations until not in
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* postcopy stage.
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*/
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bool (*is_active_iterate)(void *opaque);
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/* This runs outside the iothread lock in the migration case, and
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* within the lock in the savevm case. The callback had better only
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* use data that is local to the migration thread or protected
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* by other locks.
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*/
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int (*save_live_iterate)(QEMUFile *f, void *opaque);
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/* This runs outside the iothread lock! */
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int (*save_setup)(QEMUFile *f, void *opaque);
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/* Note for save_live_pending:
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* must_precopy:
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* - must be migrated in precopy or in stopped state
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* - i.e. must be migrated before target start
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*
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* can_postcopy:
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* - can migrate in postcopy or in stopped state
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* - i.e. can migrate after target start
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* - some can also be migrated during precopy (RAM)
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* - some must be migrated after source stops (block-dirty-bitmap)
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*
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* Sum of can_postcopy and must_postcopy is the whole amount of
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* pending data.
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*/
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/* This estimates the remaining data to transfer */
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void (*state_pending_estimate)(void *opaque, uint64_t *must_precopy,
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uint64_t *can_postcopy);
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/* This calculate the exact remaining data to transfer */
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void (*state_pending_exact)(void *opaque, uint64_t *must_precopy,
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uint64_t *can_postcopy);
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LoadStateHandler *load_state;
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int (*load_setup)(QEMUFile *f, void *opaque);
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int (*load_cleanup)(void *opaque);
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/* Called when postcopy migration wants to resume from failure */
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int (*resume_prepare)(MigrationState *s, void *opaque);
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/* Checks if switchover ack should be used. Called only in dest */
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bool (*switchover_ack_needed)(void *opaque);
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} SaveVMHandlers;
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int register_savevm_live(const char *idstr,
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uint32_t instance_id,
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int version_id,
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const SaveVMHandlers *ops,
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void *opaque);
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void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque);
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#endif
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