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c7c0e72408
qemu/migration
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David Hildenbrand c7c0e72408 migration/ram: Handle RAM block resizes during precopy 
Resizing while migrating is dangerous and does not work as expected.
The whole migration code works on the usable_length of ram blocks and does
not expect this to change at random points in time.

In the case of precopy, the ram block size must not change on the source,
after syncing the RAM block list in ram_save_setup(), so as long as the
guest is still running on the source.

Resizing can be trigger *after* (but not during) a reset in
ACPI code by the guest
- hw/arm/virt-acpi-build.c:acpi_ram_update()
- hw/i386/acpi-build.c:acpi_ram_update()

Use the ram block notifier to get notified about resizes. Let's simply
cancel migration and indicate the reason. We'll continue running on the
source. No harm done.

Update the documentation. Postcopy will be handled separately.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210429112708.12291-5-david@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  Manual merge
2021-05-13 18:21:13 +01:00
..
block-dirty-bitmap.c migration/block-dirty-bitmap: make incoming disabled bitmaps busy 2021-03-24 13:41:19 +00:00
block.c migration: using trace_ to replace DPRINTF 2020-10-26 16:15:04 +00:00
block.h migration: disable auto-converge during bulk block migration 2017-09-27 11:27:14 +01:00
channel.c yank: Remove dependency on qiochannel 2021-04-01 15:27:44 +04:00
channel.h migration: Route errors down through migration_channel_connect 2018-02-06 10:55:12 +00:00
colo-failover.c qemu/atomic.h: rename atomic_ to qatomic_ 2020-09-23 16:07:44 +01:00
colo.c Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
dirtyrate.c migration/dirtyrate: simplify includes in dirtyrate.c 2020-11-12 15:52:14 +00:00
dirtyrate.h migration/dirtyrate: Implement set_sample_page_period() and is_sample_period_valid() 2020-09-25 12:45:58 +01:00
exec.c migration: unify incoming processing 2018-07-10 12:48:53 +01:00
exec.h migration: Export exec.c functions in its own file 2017-06-01 18:49:22 +02:00
fd.c monitor: Use getter/setter functions for cur_mon 2020-10-09 07:08:19 +02:00
fd.h migration: Fix fd protocol for incoming defer 2019-06-05 12:43:55 +02:00
global_state.c migration: Silence compiler warning in global_state_store_running() 2020-10-02 12:28:48 +01:00
meson.build For 6.0 misc patches under my radar. 2021-04-01 17:08:48 +01:00
migration.c migration/ram: Handle RAM block resizes during precopy 2021-05-13 18:21:13 +01:00
migration.h migration/ram: Handle RAM block resizes during precopy 2021-05-13 18:21:13 +01:00
multifd-zlib.c multifd: Add zlib compression multifd support 2020-02-28 09:24:43 +01:00
multifd-zstd.c multifd: Add zstd compression multifd support 2020-02-28 09:25:49 +01:00
multifd.c yank: Remove dependency on qiochannel 2021-04-01 15:27:44 +04:00
multifd.h migration/tls: add tls_hostname into MultiFDSendParams 2020-09-25 12:45:58 +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 qapi: Use QAPI_LIST_PREPEND() where possible 2020-12-19 10:20:14 +01:00
postcopy-ram.h migration/: fix some comment spelling errors 2020-09-17 20:36:32 +02:00
qemu-file-channel.c yank: Remove dependency on qiochannel 2021-04-01 15:27:44 +04:00
qemu-file-channel.h migration: Export qemu-file-channel.c functions in its own file 2017-05-18 19:20:50 +02:00
qemu-file.c migration/qemu-file: Fix maybe uninitialized on qemu_get_buffer_in_place() 2021-02-08 11:19:51 +00:00
qemu-file.h Header cleanup patches for 2019-08-13 2019-08-16 14:53:43 +01:00
ram.c migration/ram: Handle RAM block resizes during precopy 2021-05-13 18:21:13 +01:00
ram.h migration: Pre-fault memory before starting background snasphot 2021-04-07 18:37:28 +01:00
rdma.c migration: Delete redundant spaces 2020-10-26 16:15:04 +00:00
rdma.h migration: Export rdma.c functions in its own file 2017-06-01 18:49:23 +02:00
savevm.c migration: introduce snapshot-{save, load, delete} QMP commands 2021-02-08 11:19:52 +00:00
savevm.h migration: Add blocker information 2021-02-08 11:19:51 +00:00
socket.c migration: unify the framework of socket-type channel 2020-08-28 13:34:52 +01:00
socket.h migration: unify the framework of socket-type channel 2020-08-28 13:34:52 +01:00
tls.c migration: Fix Lesser GPL version number 2020-11-15 16:43:28 +01:00
tls.h migration: Fix Lesser GPL version number 2020-11-15 16:43:28 +01:00
trace-events migration: support UFFD write fault processing in ram_save_iterate() 2021-02-08 11:19:51 +00:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vmstate-types.c migration: Replace migration's JSON writer by the general one 2020-12-19 10:39:16 +01:00
vmstate.c migration: Replace migration's JSON writer by the general one 2020-12-19 10:39:16 +01:00
xbzrle.c migration: Create migration/xbzrle.h 2017-05-18 18:04:54 +02:00
xbzrle.h migration: Create migration/xbzrle.h 2017-05-18 18:04:54 +02:00
yank_functions.c yank: Remove dependency on qiochannel 2021-04-01 15:27:44 +04:00
yank_functions.h yank: Remove dependency on qiochannel 2021-04-01 15:27:44 +04:00