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2023-05-15qemu-file: Remove total from qemu_file_total_transferred_*()Juan Quintela
Function is already quite long. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20230508130909.65420-7-quintela@redhat.com>
2023-05-15migration: We set the rate_limit by a secondJuan Quintela
That the implementation does the check every 100 milliseconds is an implementation detail that shouldn't be seen on the interfaz. Notice that all callers of qemu_file_set_rate_limit() used the division or pass 0, so this change is a NOP. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20230508130909.65420-4-quintela@redhat.com>
2023-05-15migration: A rate limit value of 0 is validJuan Quintela
And it is the best way to not have rate_limit. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20230508130909.65420-2-quintela@redhat.com>
2023-05-10migration: block incoming colo when capability is disabledVladimir Sementsov-Ogievskiy
We generally require same set of capabilities on source and target. Let's require x-colo capability to use COLO on target. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Lukas Straub <lukasstraub2@web.de> Reviewed-by: Zhang Chen <chen.zhang@intel.com> Message-Id: <20230428194928.1426370-11-vsementsov@yandex-team.ru> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-10migration: disallow change capabilities in COLO stateVladimir Sementsov-Ogievskiy
COLO is not listed as running state in migrate_is_running(), so, it's theoretically possible to disable colo capability in COLO state and the unexpected error in migration_iteration_finish() is reachable. Let's disallow that in qmp_migrate_set_capabilities. Than the error becomes absolutely unreachable: we can get into COLO state only with enabled capability and can't disable it while we are in COLO state. So substitute the error by simple assertion. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20230428194928.1426370-10-vsementsov@yandex-team.ru> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-10migration: process_incoming_migration_co: simplify code flow around retVladimir Sementsov-Ogievskiy
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Zhang Chen <chen.zhang@intel.com> Message-Id: <20230428194928.1426370-7-vsementsov@yandex-team.ru> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-10migration: drop colo_incoming_thread from MigrationIncomingStateVladimir Sementsov-Ogievskiy
have_colo_incoming_thread variable is unused. colo_incoming_thread can be local. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Zhang Chen <chen.zhang@intel.com> Message-Id: <20230428194928.1426370-6-vsementsov@yandex-team.ru> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-10build: move COLO under CONFIG_REPLICATIONVladimir Sementsov-Ogievskiy
We don't allow to use x-colo capability when replication is not configured. So, no reason to build COLO when replication is disabled, it's unusable in this case. Note also that the check in migrate_caps_check() is not the only restriction: some functions in migration/colo.c will just abort if called with not defined CONFIG_REPLICATION, for example: migration_iteration_finish() case MIGRATION_STATUS_COLO: migrate_start_colo_process() colo_process_checkpoint() abort() It could probably make sense to have possibility to enable COLO without REPLICATION, but this requires deeper audit of colo & replication code, which may be done later if needed. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Acked-by: Dr. David Alan Gilbert <dave@treblig.org> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20230428194928.1426370-4-vsementsov@yandex-team.ru> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-10migration: Attempt disk reactivation in more failure scenariosEric Blake
Commit fe904ea824 added a fail_inactivate label, which tries to reactivate disks on the source after a failure while s->state == MIGRATION_STATUS_ACTIVE, but didn't actually use the label if qemu_savevm_state_complete_precopy() failed. This failure to reactivate is also present in commit 6039dd5b1c (also covering the new s->state == MIGRATION_STATUS_DEVICE state) and 403d18ae (ensuring s->block_inactive is set more reliably). Consolidate the two labels back into one - no matter HOW migration is failed, if there is any chance we can reach vm_start() after having attempted inactivation, it is essential that we have tried to restart disks before then. This also makes the cleanup more like migrate_fd_cancel(). Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20230502205212.134680-1-eblake@redhat.com> Acked-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-05-08migration: Initialize and cleanup decompression in migration.cLukas Straub
This fixes compress with colo. Signed-off-by: Lukas Straub <lukasstraub2@web.de> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-05-05migration: max_postcopy_bandwidth is a size parameterJuan Quintela
So make everything that uses it uint64_t no int64_t. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20230504113841.23130-2-quintela@redhat.com>
2023-05-03migration: Rename ram_counters to mig_statsJuan Quintela
migration_stats is just too long, and it is going to have more than ram counters in the near future. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Lukas Straub <lukasstraub2@web.de>
2023-05-03migration: Move ram_stats to its own file migration-stats.[ch]Juan Quintela
There is already include/qemu/stats.h, so stats.h was a bad idea. We want this file to not depend on anything else, we will move all the migration counters/stats to this struct. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Lukas Straub <lukasstraub2@web.de>
2023-04-27migration: Make dirty_bytes_last_sync atomicJuan Quintela
As we set its value, it needs to be operated with atomics. We rename it from remaining to better reflect its meaning. Statistics always return the real reamaining bytes. This was used to store how much pages where dirty on the previous generation, so we can calculate the expected downtime as: dirty_bytes_last_sync / current_bandwith. If we use the actual remaining bytes, we would see a very small value at the end of the iteration. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> --- I am open to use ram_bytes_remaining() in its only use and be more "optimistic" about the downtime. Don't use __nocheck() functions. Use stat64_get() now that it exists.
2023-04-27migration: Make dirty_pages_rate atomicJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Peter Xu <peterx@redhat.com> --- Don't use __nocheck() variants Use stat64_get()
2023-04-27migration: Move migration_properties to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Remove MigrationState from block_cleanup_parameters()Juan Quintela
This makes the function more regular with everything else. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Move block_cleanup_parameters() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Move migrate_set_block_incremental() to options.cJuan Quintela
Once there, make it more regular and remove the need for MigrationState parameter. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Create migrate_downtime_limit() functionJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Create migrate_params_init() functionJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Move qmp_migrate_set_parameters() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-27migration: Move migrate_use_tls() to options.cJuan Quintela
Once there, rename it to migrate_tls() and make it return bool for consistency. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> --- Fix typos found by fabiano
2023-04-24migration: Create migrate_max_bandwidth() functionJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fabiano Rosas <farosas@suse.de>
2023-04-24migration: Move migrate_postcopy() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fabiano Rosas <farosas@suse.de>
2023-04-24migration: Move migrate_announce_params() to option.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fabiano Rosas <farosas@suse.de> --- Fix extra whitespace (fabiano)
2023-04-24migration: Move migrate_use_block_incremental() to option.cJuan Quintela
To be consistent with every other parameter, rename to migrate_block_incremental(). Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Use migrate_max_postcopy_bandwidth()Juan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move parameters functions to option.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_cap_set() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move qmp_migrate_set_capabilities() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move qmp_query_migrate_capabilities() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_caps_check() to options.cJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_return() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_return_path() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_block() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_block() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_xbzrle() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_xbzrle() to be consistent with all other capabilities. We change the type to return bool also for consistency. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_zero_copy_send() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_zero_copy_send() to be consistent with all other capabilities. We can remove the CONFIG_LINUX guard. We already check that we can't setup this capability in migrate_caps_check(). Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_multifd() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_multifd() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_events() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_events() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_use_compression() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_compress() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Move migrate_colo_enabled() to options.cJuan Quintela
Once that we are there, we rename the function to migrate_colo() to be consistent with all other capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Create options.cJuan Quintela
We move there all capabilities helpers from migration.c. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> --- Following David advise: - looked through the history, capabilities are newer than 2012, so we can remove that bit of the header. - This part is posterior to Anthony. Original Author is Orit. Once there, I put myself. Peter Xu also did quite a bit of work here. Anyone else wants/needs to be there? I didn't search too hard because nobody asked before to be added. What do you think?
2023-04-24migration: Create migrate_cap_set()Juan Quintela
And remove the convoluted use of qmp_migrate_set_capabilities() to enable disable MIGRATION_CAPABILITY_BLOCK. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Fabiano Rosas <farosas@suse.de>
2023-04-24spice: move client_migrate_info command to ui/Juan Quintela
It has nothing to do with migration, except for the "migrate" in the name of the command. Move it with the rest of the ui commands. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2023-04-24migration: move migration_global_dump() to migration-hmp-cmds.cJuan Quintela
It is only used there, so we can make it static. Once there, remove spice.h that it is not used. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> --- fix David Edmonson ui/qemu-spice.h unintended removal
2023-04-24migration: Minor control flow simplificationEric Blake
No need to declare a temporary variable. Suggested-by: Juan Quintela <quintela@redhat.com> Fixes: 1df36e8c6289 ("migration: Handle block device inactivation failures better") Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-04-24migration: Pass migrate_caps_check() the old and new capsJuan Quintela
We used to pass the old capabilities array and the new capabilities as a list. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: rename enabled_capabilities to capabilitiesJuan Quintela
It is clear from the context what that means, and such a long name with the extra long names of the capabilities make very difficilut to stay inside the 80 columns limit. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2023-04-24migration: Handle block device inactivation failures betterEric Blake
Consider what happens when performing a migration between two host machines connected to an NFS server serving multiple block devices to the guest, when the NFS server becomes unavailable. The migration attempts to inactivate all block devices on the source (a necessary step before the destination can take over); but if the NFS server is non-responsive, the attempt to inactivate can itself fail. When that happens, the destination fails to get the migrated guest (good, because the source wasn't able to flush everything properly): (qemu) qemu-kvm: load of migration failed: Input/output error at which point, our only hope for the guest is for the source to take back control. With the current code base, the host outputs a message, but then appears to resume: (qemu) qemu-kvm: qemu_savevm_state_complete_precopy_non_iterable: bdrv_inactivate_all() failed (-1) (src qemu)info status VM status: running but a second migration attempt now asserts: (src qemu) qemu-kvm: ../block.c:6738: int bdrv_inactivate_recurse(BlockDriverState *): Assertion `!(bs->open_flags & BDRV_O_INACTIVE)' failed. Whether the guest is recoverable on the source after the first failure is debatable, but what we do not want is to have qemu itself fail due to an assertion. It looks like the problem is as follows: In migration.c:migration_completion(), the source sets 'inactivate' to true (since COLO is not enabled), then tries savevm.c:qemu_savevm_state_complete_precopy() with a request to inactivate block devices. In turn, this calls block.c:bdrv_inactivate_all(), which fails when flushing runs up against the non-responsive NFS server. With savevm failing, we are now left in a state where some, but not all, of the block devices have been inactivated; but migration_completion() then jumps to 'fail' rather than 'fail_invalidate' and skips an attempt to reclaim those those disks by calling bdrv_activate_all(). Even if we do attempt to reclaim disks, we aren't taking note of failure there, either. Thus, we have reached a state where the migration engine has forgotten all state about whether a block device is inactive, because we did not set s->block_inactive in enough places; so migration allows the source to reach vm_start() and resume execution, violating the block layer invariant that the guest CPUs should not be restarted while a device is inactive. Note that the code in migration.c:migrate_fd_cancel() will also try to reactivate all block devices if s->block_inactive was set, but because we failed to set that flag after the first failure, the source assumes it has reclaimed all devices, even though it still has remaining inactivated devices and does not try again. Normally, qmp_cont() will also try to reactivate all disks (or correctly fail if the disks are not reclaimable because NFS is not yet back up), but the auto-resumption of the source after a migration failure does not go through qmp_cont(). And because we have left the block layer in an inconsistent state with devices still inactivated, the later migration attempt is hitting the assertion failure. Since it is important to not resume the source with inactive disks, this patch marks s->block_inactive before attempting inactivation, rather than after succeeding, in order to prevent any vm_start() until it has successfully reactivated all devices. See also https://bugzilla.redhat.com/show_bug.cgi?id=2058982 Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Acked-by: Lukas Straub <lukasstraub2@web.de> Tested-by: Lukas Straub <lukasstraub2@web.de> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-04-24migration: Rename normal to normal_pagesJuan Quintela
Rest of counters that refer to pages has a _pages suffix. And historically, this showed the number of full pages transferred. The name "normal" refered to the fact that they were sent without any optimization (compression, xbzrle, zero_page, ...). Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com>
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