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Peter Xu baab4473db migration/multifd: Document the reason to sync for save_setup() 
It's not straightforward to see why src QEMU needs to sync multifd during
setup() phase.  After all, there's no page queued at that point.

For old QEMUs, there's a solid reason: EOS requires it to work.  While it's
clueless on the new QEMUs which do not take EOS message as sync requests.

One will figure that out only when this is conditionally removed.  In fact,
the author did try it out.  Logically we could still avoid doing this on
new machine types, however that needs a separate compat field and that can
be an overkill in some trivial overhead in setup() phase.

Let's instead document it completely, to avoid someone else tries this
again and do the debug one more time, or anyone confused on why this ever
existed.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Message-Id: <20241206224755.1108686-8-peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
2025-01-09 17:38:32 -03:00
..
block-dirty-bitmap.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
channel-block.c io: follow coroutine AioContext in qio_channel_yield() 2023-09-07 20:32:11 -05:00
channel-block.h migration: introduce a QIOChannel impl for BlockDriverState VMState 2022-06-22 19:33:43 +01:00
channel.c migration: Fix migration_channel_read_peek() error path 2024-01-04 09:52:42 +08:00
channel.h migration: check magic value for deciding the mapping of channels 2023-02-06 19:22:57 +01:00
colo-failover.c migration/colo: Improve an x-colo-lost-heartbeat error message 2023-02-23 14:10:17 +01:00
colo-stubs.c migration/colo: make colo_incoming_co() return void 2024-05-22 17:34:31 -03:00
colo.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
cpu-throttle.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
dirtyrate.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
dirtyrate.h include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
exec.c migration: simplify exec migration functions 2024-03-04 07:12:40 +01:00
exec.h migration: convert exec backend to accept MigrateAddress. 2023-11-02 11:35:04 +01:00
fd.c migration: Allow pipes to keep working for fd migrations 2024-11-25 16:21:55 -05:00
fd.h migration: Revert mapped-ram multifd support to fd: URI 2024-03-22 12:12:08 -04:00
file.c migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov 2024-09-03 16:24:35 -03:00
file.h migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov 2024-09-03 16:24:35 -03:00
global_state.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
meson.build migration: Move cpu-throttle.c from system to migration 2024-10-31 15:48:18 -04:00
migration-hmp-cmds.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
migration-stats.c migration: migration_rate_limit_reset() don't need the QEMUFile 2023-10-31 08:44:33 +01:00
migration-stats.h migration: Remove transferred atomic counter 2023-10-31 08:44:33 +01:00
migration.c migration: Unexport migration_is_active() 2024-12-26 07:23:38 +01:00
migration.h include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
multifd-nocomp.c migration/multifd: Cleanup src flushes on condition check 2025-01-09 17:38:27 -03:00
multifd-qatzip.c migration/multifd: Fix build for qatzip 2024-09-17 17:50:45 -04:00
multifd-qpl.c migration/multifd: fix build error when qpl compression is enabled 2024-10-09 08:30:53 -04:00
multifd-uadk.c migration/multifd: Fix compile error caused by page_size usage 2025-01-09 17:37:50 -03:00
multifd-zero-page.c migration/multifd: Move pages accounting into multifd_send_zero_page_detect() 2024-09-03 16:24:35 -03:00
multifd-zlib.c migration/multifd: Make MultiFDMethods const 2024-09-03 16:24:36 -03:00
multifd-zstd.c migration/multifd: Fix loop conditions in multifd_zstd_send_prepare and multifd_zstd_recv 2024-09-18 14:27:24 -04:00
multifd.c migration/multifd: Allow to sync with sender threads only 2025-01-09 17:38:12 -03:00
multifd.h migration/multifd: Cleanup src flushes on condition check 2025-01-09 17:38:27 -03:00
options.c Accel & Exec patch queue 2024-12-21 11:07:00 -05:00
options.h migration: Use device_class_set_props_n 2024-12-19 19:33:37 +01:00
page_cache.c migration: Fix cache_init()'s "Failed to allocate" error messages 2021-02-08 11:19:51 +00:00
page_cache.h migration: Clean up signed vs. unsigned XBZRLE cache-size 2021-02-08 11:19:51 +00:00
postcopy-ram.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
postcopy-ram.h migration/postcopy: Add postcopy-recover-setup phase 2024-06-21 09:47:59 -03:00
qemu-file.c migration: remove unnecessary zlib dependency 2024-05-25 13:28:02 +02:00
qemu-file.h migration: Remove non-multifd compression 2024-05-08 09:20:59 -03:00
ram.c migration/multifd: Document the reason to sync for save_setup() 2025-01-09 17:38:32 -03:00
ram.h migration/ram: Move RAM_SAVE_FLAG* into ram.h 2025-01-09 17:38:15 -03:00
rdma.c migration/rdma: Fix a memory issue for migration 2024-03-11 14:41:40 -04:00
rdma.h migration/ram: Move RAM_SAVE_FLAG* into ram.h 2025-01-09 17:38:15 -03:00
savevm.c include: Rename sysemu/ -> system/ 2024-12-20 17:44:56 +01:00
savevm.h migration: Add Error** argument to qemu_savevm_state_setup() 2024-04-23 18:36:01 -04:00
socket.c migration: Remove unused socket_send_channel_create_sync 2024-10-08 15:28:55 -04:00
socket.h migration: Remove unused socket_send_channel_create_sync 2024-10-08 15:28:55 -04:00
target.c migration: Add migration prefix to functions in target.c 2023-09-11 08:34:06 +02:00
threadinfo.c migration/multifd: Protect accesses to migration_threads 2023-07-26 10:55:56 +02:00
threadinfo.h migration/multifd: Protect accesses to migration_threads 2023-07-26 10:55:56 +02:00
tls.c migration: Drop unused parameter for migration_tls_client_create() 2023-05-03 11:24:20 +02:00
tls.h migration: Drop unused parameter for migration_tls_client_create() 2023-05-03 11:24:20 +02:00
trace-events migration/ram: Add load start trace event 2024-10-31 15:48:18 -04:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vmstate-types.c Move CPU softfloat unions to cpu-float.h 2022-04-06 14:31:43 +02:00
vmstate.c migration: Ensure vmstate_save() sets errp 2024-10-31 15:48:18 -04:00
xbzrle.c migration/xbzrle: Use i386 host/cpuinfo.h 2023-05-23 16:51:18 -07:00
xbzrle.h migration/xbzrle: Use i386 host/cpuinfo.h 2023-05-23 16:51:18 -07:00
yank_functions.c migration/yank: Use channel features 2024-01-29 11:02:12 +08:00
yank_functions.h migration: Move the yank unregister of channel_close out 2021-07-26 12:45:03 +01:00