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2012-11-02migration: move process_incoming_migration to a coroutinePaolo Bonzini
The final part of incoming migration, which now consists of process_incoming_migration for all protocols, is thus made non-blocking. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-11-02migration: move qemu_fclose to process_incoming_migrationPaolo Bonzini
The common suffix is now just process_incoming_migration. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-11-02migration: use migrate_fd_close in migrate_fd_cleanupPaolo Bonzini
migrate_fd_cleanup will usually close the file descriptor via buffered_file_close's call to migrate_fd_close. However, in the case of s->file == NULL it is "inlining" migrate_fd_close (almost: there is a direct close() instead of using s->close(s)). To fix the inconsistency and clean up the code, allow multiple calls to migrate_fd_close and use the function in migrate_fd_cleanup. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-29Merge branch 'queue/qmp' of git://repo.or.cz/qemu/qmp-unstableAurelien Jarno
* 'queue/qmp' of git://repo.or.cz/qemu/qmp-unstable: migration: go to paused state after finishing incoming migration with -S qmp: handle stop/cont in INMIGRATE state hmp: fix info cpus for sparc targets
2012-10-24migration: go to paused state after finishing incoming migration with -SPaolo Bonzini
At the end of migration the machine has started already, and cannot be destroyed without losing the guest's data. Hence, prelaunch is the wrong state. Go to the paused state instead. QEMU would reach that state anyway (after running the guest for the blink of an eye) if the "stop" command had been received after the start of migration. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-10-23migration (incoming): add error propagation to fd and exec protocolsPaolo Bonzini
And remove the superfluous integer return value. Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-23migration (outgoing): add error propagation for all protocolsPaolo Bonzini
Error propagation is already there for socket backends. Add it to other protocols, simplifying code that tests for errors that will never happen. With all protocols understanding Error, the code can be simplified further by removing the return value. Unfortunately, the quality of error messages varies depending on where the error is detected, because no Error is passed to the NonBlockingConnectHandler. Thus, the exact error message still cannot be sent to the user if the OS reports it asynchronously via SO_ERROR. If NonBlockingConnectHandler received an Error**, we could for example report the error class and/or message via a new field of the query-migration command even if it is reported asynchronously. Before: (qemu) migrate fd:ffff migrate: An undefined error has occurred (qemu) info migrate (qemu) After: (qemu) migrate fd:ffff migrate: File descriptor named 'ffff' has not been found (qemu) info migrate capabilities: xbzrle: off Migration status: failed total time: 0 milliseconds Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-23migration: use qemu-sockets to establish Unix socketsPaolo Bonzini
This makes migration-unix.c again a cut-and-paste job from migration-tcp.c, exactly as it was in the beginning. :) Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-23migration: centralize call to migrate_fd_error()Paolo Bonzini
The call to migrate_fd_error() was missing for non-socket backends, so centralize it in qmp_migrate(). Before: (qemu) migrate fd:ffff migrate: An undefined error has occurred (qemu) info migrate (qemu) After: (qemu) migrate fd:ffff migrate: An undefined error has occurred (qemu) info migrate capabilities: xbzrle: off Migration status: failed total time: 0 milliseconds (The awful error message will be fixed later in the series). Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-23migration: avoid using error_is_set and thus relying on errp != NULLPaolo Bonzini
The migration code is using errp to detect "internal" errors, this means that it relies on errp being non-NULL. No impact so far because our only QMP clients (the QMP marshaller and HMP) never pass a NULL Error **. But if we had others, this patch would make sure that migration can work with a NULL Error **. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17savevm: make qemu_file_put_notify() return errorsJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17migration: make migrate_fd_wait_for_unfreeze() return errorsJuan Quintela
Adjust all callers Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17buffered_file: We can access directly to bandwidth_limitJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17buffered_file: unfold migrate_fd_closeJuan Quintela
We only used it once, just remove the callback indirection. Signed-off-by: Juan Quintela <quintela@redhat.com>
2012-10-17buffered_file: unfold migrate_fd_wait_for_unfreezeJuan Quintela
We only used it once, just remove the callback indirection. Signed-off-by: Juan Quintela <quintela@redhat.com>
2012-10-17buffered_file: unfold migrate_fd_put_readyJuan Quintela
We only use it once, just remove the callback indirection. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17buffered_file: unfold migrate_fd_put_bufferJuan Quintela
We only used it once, just remove the callback indirection Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17migration: Add dirty_pages_rate to query migrate outputJuan Quintela
It indicates how many pages were dirtied during the last second. Signed-off-by: Juan Quintela <quintela@redhat.com>
2012-10-17migration: print expected downtime in info migrateJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com>
2012-10-17migration: export migrate_get_current()Juan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
2012-10-17migration: print total downtime for final phase of migrationJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com>
2012-10-17migration: store end_time in a local variableJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com>
2012-09-25Clear handler only for valid fdOrit Wasserman
Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-08-21migration: move total_time from ram stats to migration infoJuan Quintela
Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-08-08Add XBZRLE statisticsOrit Wasserman
Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com> Signed-off-by: Petter Svard <petters@cs.umu.se> Signed-off-by: Aidan Shribman <aidan.shribman@sap.com> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add migration accounting for normal and duplicate pagesOrit Wasserman
Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com> Signed-off-by: Petter Svard <petters@cs.umu.se> Signed-off-by: Aidan Shribman <aidan.shribman@sap.com> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add migrate_set_cache_size commandOrit Wasserman
Change XBZRLE cache size in bytes (the size should be a power of 2, it will be rounded down to the nearest power of 2). If XBZRLE cache size is too small there will be many cache miss. New query-migrate-cache-size QMP command and 'info migrate_cache_size' HMP command to query cache value. Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com> Signed-off-by: Petter Svard <petters@cs.umu.se> Signed-off-by: Aidan Shribman <aidan.shribman@sap.com> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add XBZRLE to ram_save_block and ram_save_liveOrit Wasserman
In the outgoing migration check to see if the page is cached and changed, then send compressed page by using save_xbrle_page function. In the incoming migration check to see if RAM_SAVE_FLAG_XBZRLE is set and decompress the page (by using load_xbrle function). Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com> Signed-off-by: Petter Svard <petters@cs.umu.se> Signed-off-by: Aidan Shribman <aidan.shribman@sap.com> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add migrate-set-capabilitiesOrit Wasserman
The management can enable/disable a capability for the next migration by using migrate-set-capabilities QMP command. The user can use migrate_set_capability HMP command. Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-08-08Add migration capabilitiesOrit Wasserman
The management can query the current migration capabilities using query-migrate-capabilities QMP command. The user can use 'info migrate_capabilities' HMP command. Currently only XBZRLE capability is available. Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2012-06-29Add spent time for migrationJuan Quintela
We add time spent for migration to the output of "info migrate" command. 'total_time' means time since the start fo migration if migration is 'active', and total time of migration if migration is completed. As we are also interested in transferred ram when migration completes, adding all ram statistics Signed-off-by: Juan Quintela <quintela@redhat.com>
2012-06-29Add MigrationParams structureIsaku Yamahata
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
2012-05-10use inet_listen()/inet_connect() to support ipv6 migrationAmos Kong
Use help functions in qemu-socket.c for tcp migration, which already support ipv6 addresses. Currently errp will be set to UNDEFINED_ERROR when migration fails, qemu would output "migration failed: ...", and current user can see a message("An undefined error has occurred") in monitor. This patch changed tcp_start_outgoing_migration()/inet_connect() /inet_connect_opts(), socket error would be passed back, then current user can see a meaningful err message in monitor. Qemu will exit if listening fails, so output socket error to qemu stderr. For IPv6 brackets must be mandatory if you require a port. Referencing to RFC5952, the recommended format is: [2312::8274]:5200 test status: Successed listen side: qemu-kvm .... -incoming tcp:[2312::8274]:5200 client side: qemu-kvm ... (qemu) migrate -d tcp:[2312::8274]:5200 Signed-off-by: Amos Kong <akong@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-05-08wakeup on migrationGerd Hoffmann
Wakeup the guest when the live part of the migation is finished. This avoids being in suspended state on migration, so we don't have to save the is_suspended bit. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-04-05migration: clear BDRV_O_INCOMING flags on end of incoming live migrationBenoît Canet
Signed-off-by: Benoît Canet <benoit.canet@gmail.com> Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-03-15qapi: Convert migrateLuiz Capitulino
The migrate command is one of those commands where HMP and QMP completely mix up together. This made the conversion to the QAPI (which separates the command into QMP and HMP parts) a bit difficult. The first important change to be noticed is that this commit completes the removal of the Monitor object from migration code, started by the previous commit. Another important and tricky change is about supporting the non-detached mode. That is, if the user doesn't pass '-d' the migrate command will lock the monitor and will only release it when migration is finished. To support this in the new HMP command (hmp_migrate()), it is necessary to create a timer which runs every second and checks if the migration is still active. If it is, the timer callback will re-schedule itself to run one second in the future. If the migration has already finished, the monitor lock is released and the user can use it normally. All these changes should be transparent to the user. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-03-15Purge migration of (almost) everything to do with monitorsLuiz Capitulino
The Monitor object is passed back and forth within the migration/savevm code so that it can print errors and progress to the user. However, that approach assumes a HMP monitor, being completely invalid in QMP. This commit drops almost every single usage of the Monitor object, all monitor_printf() calls have been converted into DPRINTF() ones. There are a few remaining Monitor objects, those are going to be dropped by the next commit. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2012-02-17notifier: switch to QLISTPaolo Bonzini
Notifiers do not need to access both ends of the list, and using a QLIST also simplifies the API. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-01-13prepare for future GPLv2+ relicensingPaolo Bonzini
All files under GPLv2 will get GPLv2+ changes starting tomorrow. event_notifier.c and exec-obsolete.h were only ever touched by Red Hat employees and can be relicensed now. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-12-12migrate_fd_cleanup: accept any negative qemu_fclose() value as errorEduardo Habkost
Also, we now return the qemu_fclose() value unchanged to the caller. For reference, the migrate_fd_cleanup() callers are the following: - migrate_fd_completed(): any negative value is considered an error, so the change is OK. - migrate_fd_error(): doesn't check the migrate_fd_cleanup() return value - migrate_fd_cancel(): doesn't check the migrate_fd_cleanup() return value Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-12-06qapi: Convert migrate_set_speedLuiz Capitulino
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-06qapi: Convert migrate_set_downtimeLuiz Capitulino
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-12-06qapi: Convert migrate_cancelLuiz Capitulino
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-11-21block: allow migration to work with image files (v3)Anthony Liguori
Image files have two types of data: immutable data that describes things like image size, backing files, etc. and mutable data that includes offset and reference count tables. Today, image formats aggressively cache mutable data to improve performance. In some cases, this happens before a guest even starts. When dealing with live migration, since a file is open on two machines, the caching of meta data can lead to data corruption. This patch addresses this by introducing a mechanism to invalidate any cached mutable data a block driver may have which is then used by the live migration code. NB, this still requires coherent shared storage. Addressing migration without coherent shared storage (i.e. NFS) requires additional work. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-21migrate: add migration blockersAnthony Liguori
This lets different subsystems register an Error that is thrown whenever migration is attempted. This works nicely because it gracefully supports things like hotplug. Right now, if multiple errors are registered, only one of them is reported. I expect that for 1.1, we'll extend query-migrate to return all of the reasons why migration is disabled at any given point in time. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-11migration: fix detached migration with fdJuan Quintela
Migration with fd uses s->mon to pass the fd. But we only assign the s->mon for !detached migration. Fix it. Once there add a comment indicating that s->mon has two uses. Bug reported by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Juan Quintela <quintela@redhat.com> CC: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-11-01Fix segfault on migration completionLuiz Capitulino
A simple migration reproduces it: 1. Start the source VM with: # qemu [...] -S 2. Start the destination VM with: # qemu <source VM cmd-line> -incoming tcp:0:4444 3. In the source VM: (qemu) migrate -d tcp:0:4444 4. The source VM will segfault as soon as migration completes (might not happen in the first try) What is happening here is that qemu_file_put_notify() can end up closing 's->file' (in which case it's also set to NULL). The call stack is rather complex, but Eduardo helped tracking it to: select loop -> migrate_fd_put_notify() -> qemu_file_put_notify() -> buffered_put_buffer() -> migrate_fd_put_ready() -> migrate_fd_completed() -> migrate_fd_cleanup(). To be honest, it's not completely clear to me in which cases 's->file' is not closed (on error maybe)? But I doubt this fix will make anything worse. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Acked-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-10-31Merge remote-tracking branch 'qmp/queue/qmp' into stagingAnthony Liguori
Conflicts: ui/spice-core.c
2011-10-27qapi: Convert query-migrateLuiz Capitulino
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2011-10-25migration: add status query functionsGerd Hoffmann
Add migration_is_active and migration_has_failed functions to query migration state. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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