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migration: Implement switchover ack logic

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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>
This commit is contained in:
Avihai Horon 2023-06-21 14:11:55 +03:00 • committed by Cédric Le Goater
parent 6574232fff
commit 1b4adb10f8
6 changed files with 104 additions and 2 deletions
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3
migration/trace-events
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@ -7,6 +7,7 @@ qemu_loadvm_state_section_partend(uint32_t section_id) "%u"
qemu_loadvm_state_post_main(int ret) "%d"
qemu_loadvm_state_section_startfull(uint32_t section_id, const char *idstr, uint32_t instance_id, uint32_t version_id) "%u(%s) %u %u"
qemu_savevm_send_packaged(void) ""
loadvm_state_switchover_ack_needed(unsigned int switchover_ack_pending_num) "Switchover ack pending num=%u"
loadvm_state_setup(void) ""
loadvm_state_cleanup(void) ""
loadvm_handle_cmd_packaged(unsigned int length) "%u"
@ -23,6 +24,7 @@ loadvm_postcopy_ram_handle_discard_end(void) ""
loadvm_postcopy_ram_handle_discard_header(const char *ramid, uint16_t len) "%s: %ud"
loadvm_process_command(const char *s, uint16_t len) "com=%s len=%d"
loadvm_process_command_ping(uint32_t val) "0x%x"
loadvm_approve_switchover(unsigned int switchover_ack_pending_num) "Switchover ack pending num=%u"
postcopy_ram_listen_thread_exit(void) ""
postcopy_ram_listen_thread_start(void) ""
qemu_savevm_send_postcopy_advise(void) ""
@ -180,6 +182,7 @@ source_return_path_thread_loop_top(void) ""
source_return_path_thread_pong(uint32_t val) "0x%x"
source_return_path_thread_shut(uint32_t val) "0x%x"
source_return_path_thread_resume_ack(uint32_t v) "%"PRIu32
source_return_path_thread_switchover_acked(void) ""
migration_thread_low_pending(uint64_t pending) "%" PRIu64
migrate_transferred(uint64_t tranferred, uint64_t time_spent, uint64_t bandwidth, uint64_t size) "transferred %" PRIu64 " time_spent %" PRIu64 " bandwidth %" PRIu64 " max_size %" PRId64
process_incoming_migration_co_end(int ret, int ps) "ret=%d postcopy-state=%d"