This is the 13th version of COLO (Still only support periodic checkpoint). Here is only COLO frame part, you can get the whole codes from github: https://github.com/coloft/qemu/commits/colo-v2.4-periodic-mode
Please ignore patch 4 ~ 5 which have been picked by Dave into another series. Test procedure: 1. Startup qemu Primary side: #x86_64-softmmu/qemu-system-x86_64 -enable-kvm -boot c -m 2048 -smp 2 -qmp stdio -vnc :7 -name primary -cpu qemu64,+kvmclock -device piix3-usb-uhci -device usb-tablet -netdev tap,id=hn0,vhost=off -device virtio-net-pci,id=net-pci0,netdev=hn0 -drive if=virtio,id=colo-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,children.0.file.filename=/mnt/sdd/pure_IMG/linux/redhat/rhel_6.5_64_2U_ide,children.0.driver=raw Secondary side: #x86_64-softmmu/qemu-system-x86_64 -boot c -m 2048 -smp 2 -qmp stdio -vnc :7 -name secondary -enable-kvm -cpu qemu64,+kvmclock -device piix3-usb-uhci -device usb-tablet -netdev tap,id=hn0,vhost=off -device virtio-net-pci,id=net-pci0,netdev=hn0 -drive if=none,id=colo-disk0,file.filename=/mnt/sdd/pure_IMG/linux/redhat/rhel_6.5_64_2U_ide,driver=raw,node-name=node0 -drive if=virtio,id=active-disk0,throttling.bps-total=70000000,driver=replication,mode=secondary,file.driver=qcow2,file.file.filename=/mnt/ramfs/active_disk.img,file.backing.driver=qcow2,file.backing.file.filename=/mnt/ramfs/hidden_disk.img,file.backing.backing=colo-disk0 -incoming tcp:0:8888 2. On Secondary VM's QEMU monitor, issue command {'execute':'qmp_capabilities'} {'execute': 'nbd-server-start', 'arguments': {'addr': {'type': 'inet', 'data': {'host': '192.168.2.88', 'port': '8889'} } } } {'execute': 'nbd-server-add', 'arguments': {'device': 'colo-disk0', 'writable': true } } {'execute': 'trace-event-set-state', 'arguments': {'name': 'colo*', 'enable': true} } 3. On Primary VM's QEMU monitor, issue command: {'execute':'qmp_capabilities'} {'execute': 'human-monitor-command', 'arguments': {'command-line': 'drive_add buddy driver=replication,mode=primary,file.driver=nbd,file.host=9.61.1.7,file.port=8889,file.export=colo-disk0,node-name=node0,if=none'}} {'execute':'x-blockdev-change', 'arguments':{'parent': 'colo-disk0', 'node': 'node0' } } {'execute': 'migrate-set-capabilities', 'arguments': {'capabilities': [ {'capability': 'x-colo', 'state': true } ] } } {'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.2.88:8888' } } 4. After the above steps, you will see, whenever you make changes to PVM, SVM will be synced. You can by issue command '{ "execute": "migrate-set-parameters" , "arguments":{ "x-checkpoint-delay": 2000 } }' to change the checkpoint period time. 5. Failover test You can kill Primary VM and run 'x_colo_lost_heartbeat' in Secondary VM's monitor at the same time, then SVM will failover and client will not feel this change. Before issuing '{ "execute": "x-colo-lost-heartbeat" }' command, we have to issue block related command to stop block replication. Primary: Remove the nbd child from the quorum: { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0', 'child': 'children.1'}} Note: there is no qmp command to remove the blockdev now Secondary: The primary host is down, so we should do the following thing: { 'execute': 'nbd-server-stop' } Please review, thanks. TODO: 1. Checkpoint based on proxy in qemu 2. The capability of continuous FT 3. Optimize the VM's downtime during checkpoint v13: - Refactor colo_*_cmd helper functions to use 'Error **errp' parameter instead of return value to indicate success or failure. (patch 10) - Remove the optional error message for COLO_EXIT event. (patch 25) - Use semaphore to notify colo/colo incoming loop that failover work is finished. (patch 26) - Move COLO shutdown related codes to colo.c file. (patch 28) - Fix memory leak bug for colo incoming loop. (new patch 31) - Re-use some existed helper functions to realize the process of saving/loading ram and device. (patch 32) - Fix some other comments from Dave and Markus. v12: - Fix the bug that default buffer filter broken vhost-net. - Add an flag in struct NetFilterState to help skipping default filter for packets travelling through filter layer. - Remove the default failover treatment which may cause split-brain. - Rename checkpoint-delay to x-checkpoint-delay. - Check if all netdev supports default filter before going into COLO. - Reconstruct send/receive helper functions in patch 10. - Address serveral other comments from Dave v11: - Re-implement buffer/release packets based on filter-buffer according to Jason Wang's suggestion. (patch 34, patch 36 ~ patch 38) - Rebase master to re-use some stuff introduced by post-copy. - Address several comments from Eric and Dave, the fixing record can be found in each patch. v10: - Rename 'colo_lost_heartbeat' command to experimental 'x_colo_lost_heartbeat' - Rename migration capability 'colo' to 'x-colo' (Eric's suggestion) - Simplify the process of primary side by dropping colo thread and reusing migration thread. (Dave's suggestion) - Add several netfilter related APIs to support buffer/release packets for COLO (patch 32 ~ patch 36) zhanghailiang (39): configure: Add parameter for configure to enable/disable COLO support migration: Introduce capability 'x-colo' to migration COLO: migrate colo related info to secondary node migration: Export migrate_set_state() migration: Add state records for migration incoming migration: Integrate COLO checkpoint process into migration migration: Integrate COLO checkpoint process into loadvm migration: Rename the'file' member of MigrationState COLO/migration: Create a new communication path from destination to source COLO: Implement colo checkpoint protocol COLO: Add a new RunState RUN_STATE_COLO QEMUSizedBuffer: Introduce two help functions for qsb COLO: Save PVM state to secondary side when do checkpoint ram: Split host_from_stream_offset() into two helper functions COLO: Load PVM's dirty pages into SVM's RAM cache temporarily ram/COLO: Record the dirty pages that SVM received COLO: Load VMState into qsb before restore it COLO: Flush PVM's cached RAM into SVM's memory COLO: Add checkpoint-delay parameter for migrate-set-parameters COLO: synchronize PVM's state to SVM periodically COLO failover: Introduce a new command to trigger a failover COLO failover: Introduce state to record failover process COLO: Implement failover work for Primary VM COLO: Implement failover work for Secondary VM qmp event: Add COLO_EXIT event to notify users while exited from COLO COLO failover: Shutdown related socket fd when do failover COLO failover: Don't do failover during loading VM's state COLO: Process shutdown command for VM in COLO state COLO: Update the global runstate after going into colo state savevm: Split load vm state function qemu_loadvm_state savevm: Introduce two helper functions for save/find loadvm_handlers entry COLO: Separate the process of saving/loading ram and device state COLO: Split qemu_savevm_state_begin out of checkpoint process net/filter-buffer: Add default filter-buffer for each netdev filter-buffer: Accept zero interval filter-buffer: Introduce a helper function to enable/disable default filter filter-buffer: Introduce a helper function to release packets colo: Use default buffer-filter to buffer and release packets COLO: Add block replication into colo process configure | 11 + docs/qmp-events.txt | 16 + hmp-commands.hx | 15 + hmp.c | 15 + hmp.h | 1 + include/exec/ram_addr.h | 9 +- include/migration/colo.h | 40 +++ include/migration/failover.h | 33 ++ include/migration/migration.h | 21 +- include/migration/qemu-file.h | 3 +- include/net/filter.h | 12 + include/net/net.h | 5 + include/sysemu/sysemu.h | 9 + migration/Makefile.objs | 2 + migration/colo-comm.c | 71 ++++ migration/colo-failover.c | 83 +++++ migration/colo.c | 804 ++++++++++++++++++++++++++++++++++++++++++ migration/exec.c | 4 +- migration/fd.c | 4 +- migration/migration.c | 216 ++++++++---- migration/postcopy-ram.c | 6 +- migration/qemu-file-buf.c | 61 ++++ migration/ram.c | 213 +++++++++-- migration/rdma.c | 2 +- migration/savevm.c | 248 +++++++++---- migration/tcp.c | 4 +- migration/unix.c | 4 +- net/filter-buffer.c | 127 ++++++- net/filter.c | 6 +- net/net.c | 58 +++ qapi-schema.json | 104 +++++- qapi/event.json | 15 + qmp-commands.hx | 24 +- stubs/Makefile.objs | 1 + stubs/migration-colo.c | 45 +++ trace-events | 10 + vl.c | 30 +- 37 files changed, 2135 insertions(+), 197 deletions(-) create mode 100644 include/migration/colo.h create mode 100644 include/migration/failover.h create mode 100644 migration/colo-comm.c create mode 100644 migration/colo-failover.c create mode 100644 migration/colo.c create mode 100644 stubs/migration-colo.c -- 1.8.3.1