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2021-02-12migration: dirty-bitmap: Allow control of bitmap persistencePeter Krempa
Bitmap's source persistence is transported over the migration stream and the destination mirrors it. In some cases the destination might want to persist bitmaps which are not persistent on the source (e.g. the result of merging bitmaps from a number of layers on the source when migrating into a squashed image) but currently it would need to create another set of persistent bitmaps and merge them. This patch adds a 'transform' property to the alias map which allows overriding the persistence of migrated bitmaps both on the source and destination sides. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Message-Id: <b20afb675917b86f6359ac3591166ac6d4233573.1613150869.git.pkrempa@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [eblake: grammar tweaks, drop dead conditional] Signed-off-by: Eric Blake <eblake@redhat.com>
2021-02-12migration: dirty-bitmap: Use struct for alias map inner membersPeter Krempa
Currently the alias mapping hash stores just strings of the target objects internally. In further patches we'll be adding another member which will need to be stored in the map so pass a copy of the whole BitmapMigrationBitmapAlias QAPI struct into the map. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Message-Id: <fc5f27e1fe16cb75e08a248c2d938de3997b9bfb.1613150869.git.pkrempa@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [eblake: adjust long lines] Signed-off-by: Eric Blake <eblake@redhat.com>
2021-02-08migration: only check page size match if RAM postcopy is enabledStefan Reiter
Postcopy may also be advised for dirty-bitmap migration only, in which case the remote page size will not be available and we'll instead read bogus data, blocking migration with a mismatch error if the VM uses hugepages. Fixes: 58110f0acb ("migration: split common postcopy out of ram postcopy") Signed-off-by: Stefan Reiter <s.reiter@proxmox.com> Message-Id: <20210204163522.13291-1-s.reiter@proxmox.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: introduce snapshot-{save, load, delete} QMP commandsDaniel P. Berrangé
savevm, loadvm and delvm are some of the few HMP commands that have never been converted to use QMP. The reasons for the lack of conversion are that they blocked execution of the event thread, and the semantics around choice of disks were ill-defined. Despite this downside, however, libvirt and applications using libvirt have used these commands for as long as QMP has existed, via the "human-monitor-command" passthrough command. IOW, while it is clearly desirable to be able to fix the problems, they are not a blocker to all real world usage. Meanwhile there is a need for other features which involve adding new parameters to the commands. This is possible with HMP passthrough, but it provides no reliable way for apps to introspect features, so using QAPI modelling is highly desirable. This patch thus introduces new snapshot-{load,save,delete} commands to QMP that are intended to replace the old HMP counterparts. The new commands are given different names, because they will be using the new QEMU job framework and thus will have diverging behaviour from the HMP originals. It would thus be misleading to keep the same name. While this design uses the generic job framework, the current impl is still blocking. The intention that the blocking problem is fixed later. None the less applications using these new commands should assume that they are asynchronous and thus wait for the job status change event to indicate completion. In addition to using the job framework, the new commands require the caller to be explicit about all the block device nodes used in the snapshot operations, with no built-in default heuristics in use. Note that the existing "query-named-block-nodes" can be used to query what snapshots currently exist for block nodes. Acked-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-13-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> dgilbert: removed tests for now, the output ordering isn't deterministic
2021-02-08migration: introduce a delete_snapshot wrapperDaniel P. Berrangé
Make snapshot deletion consistent with the snapshot save and load commands by using a wrapper around the blockdev layer. The main difference is that we get upfront validation of the passed in device list (if any). Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-10-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: wire up support for snapshot device selectionDaniel P. Berrangé
Modify load_snapshot/save_snapshot to accept the device list and vmstate node name parameters previously added to the block layer. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-9-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: control whether snapshots are ovewrittenDaniel P. Berrangé
The traditional HMP "savevm" command will overwrite an existing snapshot if it already exists with the requested name. This new flag allows this to be controlled allowing for safer behaviour with a future QMP command. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-8-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08block: rename and alter bdrv_all_find_snapshot semanticsDaniel P. Berrangé
Currently bdrv_all_find_snapshot() will return 0 if it finds a snapshot, -1 if an error occurs, or if it fails to find a snapshot. New callers to be added want to distinguish between the error scenario and failing to find a snapshot. Rename it to bdrv_all_has_snapshot and make it return -1 on error, 0 if no snapshot is found and 1 if snapshot is found. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-7-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08block: allow specifying name of block device for vmstate storageDaniel P. Berrangé
Currently the vmstate will be stored in the first block device that supports snapshots. Historically this would have usually been the root device, but with UEFI it might be the variable store. There needs to be a way to override the choice of block device to store the state in. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-6-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08block: add ability to specify list of blockdevs during snapshotDaniel P. Berrangé
When running snapshot operations, there are various rules for which blockdevs are included/excluded. While this provides reasonable default behaviour, there are scenarios that are not well handled by the default logic. Some of the conditions do not have a single correct answer. Thus there needs to be a way for the mgmt app to provide an explicit list of blockdevs to perform snapshots across. This can be achieved by passing a list of node names that should be used. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-5-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: stop returning errno from load_snapshot()Daniel P. Berrangé
None of the callers care about the errno value since there is a full Error object populated. This gives consistency with save_snapshot() which already just returns a boolean value. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> [PMD: Return false/true instead of -1/0, document function] Acked-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210204124834.774401-4-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: Make save_snapshot() return bool, not 0/-1Philippe Mathieu-Daudé
Just for consistency, following the example documented since commit e3fe3988d7 ("error: Document Error API usage rules"), return a boolean value indicating an error is set or not. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Acked-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210204124834.774401-3-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08block: push error reporting into bdrv_all_*_snapshot functionsDaniel P. Berrangé
The bdrv_all_*_snapshot functions return a BlockDriverState pointer for the invalid backend, which the callers then use to report an error message. In some cases multiple callers are reporting the same error message, but with slightly different text. In the future there will be more error scenarios for some of these methods, which will benefit from fine grained error message reporting. So it is helpful to push error reporting down a level. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> [PMD: Initialize variables] Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210204124834.774401-2-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: Add blocker informationDr. David Alan Gilbert
Modify query-migrate so that it has a flag indicating if outbound migration is blocked, and if it is a list of reasons. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210202135522.127380-2-dgilbert@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: Fix a few absurdly defective error messagesMarkus Armbruster
migrate_params_check() has a number of error messages of the form Parameter 'NAME' expects is invalid, it should be ... Fix them to something like Parameter 'NAME' expects a ... Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210202141734.2488076-5-armbru@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: Fix cache_init()'s "Failed to allocate" error messagesMarkus Armbruster
cache_init() attempts to handle allocation failure. The two error messages are garbage, as untested error messages commonly are: Parameter 'cache size' expects Failed to allocate cache Parameter 'cache size' expects Failed to allocate page cache Fix them to just Failed to allocate cache Failed to allocate page cache Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210202141734.2488076-4-armbru@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: Clean up signed vs. unsigned XBZRLE cache-sizeMarkus Armbruster
73af8dd8d7 "migration: Make xbzrle_cache_size a migration parameter" (v2.11.0) made the new parameter unsigned (QAPI type 'size', uint64_t in C). It neglected to update existing code, which continues to use int64_t. migrate_xbzrle_cache_size() returns the new parameter. Adjust its return type. QMP query-migrate-cache-size returns migrate_xbzrle_cache_size(). Adjust its return type. migrate-set-parameters passes the new parameter to xbzrle_cache_resize(). Adjust its parameter type. xbzrle_cache_resize() passes it on to cache_init(). Adjust its parameter type. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210202141734.2488076-3-armbru@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: implementation of background snapshot threadAndrey Gruzdev
Introducing implementation of 'background' snapshot thread which in overall follows the logic of precopy migration while internally utilizes completely different mechanism to 'freeze' vmstate at the start of snapshot creation. This mechanism is based on userfault_fd with wr-protection support and is Linux-specific. Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> Acked-by: Peter Xu <peterx@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210129101407.103458-5-andrey.gruzdev@virtuozzo.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: support UFFD write fault processing in ram_save_iterate()Andrey Gruzdev
In this particular implementation the same single migration thread is responsible for both normal linear dirty page migration and procesing UFFD page fault events. Processing write faults includes reading UFFD file descriptor, finding respective RAM block and saving faulting page to the migration stream. After page has been saved, write protection can be removed. Since asynchronous version of qemu_put_buffer() is expected to be used to save pages, we also have to flush migraion stream prior to un-protecting saved memory range. Write protection is being removed for any previously protected memory chunk that has hit the migration stream. That's valid for pages from linear page scan along with write fault pages. Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> Acked-by: Peter Xu <peterx@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20210129101407.103458-4-andrey.gruzdev@virtuozzo.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> fixup pagefault.address cast for 32bit
2021-02-08migration: introduce 'background-snapshot' migration capabilityAndrey Gruzdev
Add new capability to 'qapi/migration.json' schema. Update migrate_caps_check() to validate enabled capability set against introduced one. Perform checks for required kernel features and compatibility with guest memory backends. Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> Reviewed-by: Peter Xu <peterx@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20210129101407.103458-2-andrey.gruzdev@virtuozzo.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration/qemu-file: Fix maybe uninitialized on qemu_get_buffer_in_place()Wainer dos Santos Moschetta
Fixed error when compiling migration/qemu-file.c with -Werror=maybe-uninitialized as shown here: ../migration/qemu-file.c: In function 'qemu_get_buffer_in_place': ../migration/qemu-file.c:604:18: error: 'src' may be used uninitialized in this function [-Werror=maybe-uninitialized] 604 | *buf = src; | ~~~~~^~~~~ cc1: all warnings being treated as errors Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com> Message-Id: <20210128130625.569900-1-wainersm@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08savevm: Fix memory leak of vmstate_configurationJinhao Gao
When VM migrate VMState of configuration, the fields(name and capabilities) of configuration having a flag of VMS_ALLOC need to allocate memory. If the src doesn't free memory of capabilities in SaveState after save VMState of configuration, or the dst doesn't free memory of name and capabilities in post load of configuration, it may result in memory leak of name and capabilities. We free memory in configuration_post_save and configuration_post_load func, which prevents memory leak. Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Jinhao Gao <gaojinhao@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20201231061020.828-3-gaojinhao@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-01-28qapi: More complex uses of QAPI_LIST_APPENDEric Blake
These cases require a bit more thought to review; in each case, the code was appending to a list, but not with a FOOList **tail variable. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210113221013.390592-6-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Flawed change to qmp_guest_network_get_interfaces() dropped] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2021-01-13migration: Add yank featureLukas Straub
Register yank functions on sockets to shut them down. Signed-off-by: Lukas Straub <lukasstraub2@web.de> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <484c6a14cc2506bebedd5a237259b91363ff8f88.1609167865.git.lukasstraub2@web.de> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2021-01-08Remove superfluous timer_del() callsPeter Maydell
This commit is the result of running the timer-del-timer-free.cocci script on the whole source tree. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Acked-by: Corey Minyard <cminyard@mvista.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20201215154107.3255-4-peter.maydell@linaro.org
2021-01-06zstd: convert to mesonPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-01-01Merge remote-tracking branch ↵Peter Maydell
'remotes/ehabkost-gl/tags/machine-next-pull-request' into staging Machine queue, 2020-12-23 Cleanup: * qdev code cleanup (Eduardo Habkost) Bug fix: * hostmem: Free host_nodes list right after visited (Keqian Zhu) # gpg: Signature made Wed 23 Dec 2020 21:25:58 GMT # gpg: using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6 # gpg: issuer "ehabkost@redhat.com" # gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full] # Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF D1AA 2807 936F 984D C5A6 * remotes/ehabkost-gl/tags/machine-next-pull-request: bugfix: hostmem: Free host_nodes list right after visited qdev: Avoid unnecessary DeviceState* variable at set_prop_arraylen() qdev: Rename qdev_get_prop_ptr() to object_field_prop_ptr() qdev: Move qdev_prop_tpm declaration to tpm_prop.h qdev: Make qdev_class_add_property() more flexible qdev: Make PropertyInfo.create return ObjectProperty* qdev: Move dev->realized check to qdev_property_set() qdev: Wrap getters and setters in separate helpers qdev: Add name argument to PropertyInfo.create method qdev: Add name parameter to qdev_class_add_property() qdev: Avoid using prop->name unnecessarily qdev: Get just property name at error_set_from_qdev_prop_error() sparc: Use DEFINE_PROP for nwindows property qdev: Reuse DEFINE_PROP in all DEFINE_PROP_* macros qdev: Move softmmu properties to qdev-properties-system.h Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-01-01Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2020-12-19' into ↵Peter Maydell
staging QAPI patches patches for 2020-12-19 # gpg: Signature made Sat 19 Dec 2020 09:40:05 GMT # gpg: using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653 # gpg: issuer "armbru@redhat.com" # gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full] # gpg: aka "Markus Armbruster <armbru@pond.sub.org>" [full] # Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653 * remotes/armbru/tags/pull-qapi-2020-12-19: (33 commits) qobject: Make QString immutable block: Use GString instead of QString to build filenames keyval: Use GString to accumulate value strings json: Use GString instead of QString to accumulate strings migration: Replace migration's JSON writer by the general one qobject: Factor JSON writer out of qobject_to_json() qobject: Factor quoted_str() out of to_json() qobject: Drop qstring_get_try_str() qobject: Drop qobject_get_try_str() Revert "qobject: let object_property_get_str() use new API" block: Avoid qobject_get_try_str() qmp: Fix tracing of non-string command IDs qobject: Move internals to qobject-internal.h hw/rdma: Replace QList by GQueue Revert "qstring: add qstring_free()" qobject: Change qobject_to_json()'s value to GString qobject: Use GString instead of QString to accumulate JSON qobject: Make qobject_to_json_pretty() take a pretty argument monitor: Use GString instead of QString for output buffer hmp: Simplify how qmp_human_monitor_command() gets output ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-12-19migration: Replace migration's JSON writer by the general oneMarkus Armbruster
Commit 8118f0950f "migration: Append JSON description of migration stream" needs a JSON writer. The existing qobject_to_json() wasn't a good fit, because it requires building a QObject to convert. Instead, migration got its very own JSON writer, in commit 190c882ce2 "QJSON: Add JSON writer". It tacitly limits numbers to int64_t, and strings contents to characters that don't need escaping, unlike qobject_to_json(). The previous commit factored the JSON writer out of qobject_to_json(). Replace migration's JSON writer by it. Cc: Juan Quintela <quintela@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20201211171152.146877-17-armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-12-19qapi: Use QAPI_LIST_PREPEND() where possibleEric Blake
Anywhere we create a list of just one item or by prepending items (typically because order doesn't matter), we can use QAPI_LIST_PREPEND(). But places where we must keep the list in order by appending remain open-coded until later patches. Note that as a side effect, this also performs a cleanup of two minor issues in qga/commands-posix.c: the old code was performing new = g_malloc0(sizeof(*ret)); which 1) is confusing because you have to verify whether 'new' and 'ret' are variables with the same type, and 2) would conflict with C++ compilation (not an actual problem for this file, but makes copy-and-paste harder). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20201113011340.463563-5-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> [Straightforward conflicts due to commit a8aa94b5f8 "qga: update schema for guest-get-disks 'dependents' field" and commit a10b453a52 "target/mips: Move mips_cpu_add_definition() from helper.c to cpu.c" resolved. Commit message tweaked.] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-12-19migration: Refactor migrate_cap_addEric Blake
Instead of taking a list parameter and returning a new head at a distance, just return the new item for the caller to insert into a list via QAPI_LIST_PREPEND. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20201113011340.463563-4-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-12-18qdev: Move softmmu properties to qdev-properties-system.hEduardo Habkost
Move the property types and property macros implemented in qdev-properties-system.c to a new qdev-properties-system.h header. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Message-Id: <20201211220529.2290218-16-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-12-18migration: Don't allow migration if vm is in POSTMIGRATETuguoyi
The following steps will cause qemu assertion failure: - pause vm by executing 'virsh suspend' - create external snapshot of memory and disk using 'virsh snapshot-create-as' - doing the above operation again will cause qemu crash The backtrace looks like: at /build/qemu-5.0/migration/savevm.c:1401 at /build/qemu-5.0/migration/savevm.c:1453 When the first migration completes, bs->open_flags will set BDRV_O_INACTIVE flag by bdrv_inactivate_all(), and during the second migration the bdrv_inactivate_recurse assert that the bs->open_flags is already BDRV_O_INACTIVE enabled which cause crash. As Vladimir suggested, this patch makes migrate_prepare check the state of vm and return error if it is in RUN_STATE_POSTMIGRATE state. Signed-off-by: Tuguoyi <tu.guoyi@h3c.com> Message-Id: <6b704294ad2e405781c38fb38d68c744@h3c.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reported-by: Li Zhang <li.zhang@cloud.ionos.com> Reviewed-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-12-18savevm: Delete snapshots just created in case of errorTuguoyi
bdrv_all_create_snapshot() can fails with some snapshots created, so it's better to delete those snapshots before returns to the caller Signed-off-by: Tuguoyi <tu.guoyi@h3c.com> Message-Id: <1607410416-13563-3-git-send-email-tu.guoyi@h3c.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-12-18savevm: Remove dead code in save_snapshot()Tuguoyi
The snapshot in each bs is deleted at the beginning, so there is no need to find the snapshot again. Signed-off-by: Tuguoyi <tu.guoyi@h3c.com> Message-Id: <1607410416-13563-2-git-send-email-tu.guoyi@h3c.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-12-10migration, vl: start migration via qmp_migrate_incomingPaolo Bonzini
Make qemu_start_incoming_migration local to migration/migration.c. By using the runstate instead of a separate flag, vl need not do anything to setup deferred incoming migration. qmp_migrate_incoming also does not need the deferred_incoming flag anymore, because "-incoming PROTOCOL" will clear the "once" flag before the main loop starts. Therefore, later invocations of the migrate-incoming command will fail with the existing "The incoming migration has already been started" error message. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: move various initialization routines out of qemu_initPaolo Bonzini
Some very simple initialization routines can be nested in existing subsystem-level functions, do that to simplify qemu_init. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-11-15migration: Fix Lesser GPL version numberChetan Pant
There is no "version 2" of the "Lesser" General Public License. It is either "GPL version 2.0" or "Lesser GPL version 2.1". This patch replaces all occurrences of "Lesser GPL version 2" with "Lesser GPL version 2.1" in comment section. Signed-off-by: Chetan Pant <chetan4windows@gmail.com> Message-Id: <20201023123130.19656-1-chetan4windows@gmail.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-11-12migration: handle CANCELLING state in migration_completion()Longpeng(Mike)
The following sequence may cause the VM abort during migration: 1. RUN_STATE_RUNNING,MIGRATION_STATUS_ACTIVE 2. before call migration_completion(), we send migrate_cancel QMP command, the state machine is changed to: RUN_STATE_RUNNING,MIGRATION_STATUS_CANCELLING 3. call migration_completion(), and the state machine is switch to: RUN_STATE_RUNNING,MIGRATION_STATUS_COMPLETED 4. call migration_iteration_finish(), because the migration status is COMPLETED, so it will try to set the runstate to POSTMIGRATE, but RUNNING-->POSTMIGRATE is an invalid transition, so abort(). The migration_completion() should not change the migration state to COMPLETED if it is already changed to CANCELLING. Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com> Message-Id: <20201105091726.148-1-longpeng2@huawei.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12multifd/tls: fix memoryleak of the QIOChannelSocket object when cancelling ↵Chuan Zheng
migration When creating new tls client, the tioc->master will be referenced which results in socket leaking after multifd_save_cleanup if we cancel migration. Fix it by do object_unref() after tls client creation. Suggested-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Chuan Zheng <zhengchuan@huawei.com> Message-Id: <1605104763-118687-1-git-send-email-zhengchuan@huawei.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12migration/dirtyrate: simplify includes in dirtyrate.cChuan Zheng
Remove redundant blank line which is left by Commit 662770af7c6e8c, also take this opportunity to remove redundant includes in dirtyrate.c. Signed-off-by: Chuan Zheng <zhengchuan@huawei.com> Message-Id: <1604030281-112946-1-git-send-email-zhengchuan@huawei.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12migration: fix uninitialized variable warning in migrate_send_rp_req_pages()Chen Qun
After the WITH_QEMU_LOCK_GUARD macro is added, the compiler cannot identify that the statements in the macro must be executed. As a result, some variables assignment statements in the macro may be considered as unexecuted by the compiler. When the -Wmaybe-uninitialized capability is enabled on GCC9,the compiler showed warning: migration/migration.c: In function ‘migrate_send_rp_req_pages’: migration/migration.c:384:8: warning: ‘received’ may be used uninitialized in this function [-Wmaybe-uninitialized] 384 | if (received) { | ^ Add a default value for 'received' to prevented the warning. Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20201111142203.2359370-6-kuhn.chenqun@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12migration/multifd: fix hangup with TLS-Multifd due to blocking handshakeChuan Zheng
The qemu main loop could hang up forever when we enable TLS+Multifd. The Src multifd_send_0 invokes tls handshake, it sends hello to sever and wait response. However, the Dst main qemu loop has been waiting recvmsg() for multifd_recv_1. Both of Src and Dst main qemu loop are blocking and waiting for reponse which results in hanging up forever. Src: (multifd_send_0) Dst: (multifd_recv_1) multifd_channel_connect migration_channel_process_incoming multifd_tls_channel_connect migration_tls_channel_process_incoming multifd_tls_channel_connect qio_channel_tls_handshake_task qio_channel_tls_handshake gnutls_handshake qio_channel_tls_handshake_task ... qcrypto_tls_session_handshake ... gnutls_handshake ... ... ... recvmsg (Blocking I/O waiting for response) recvmsg (Blocking I/O waiting for response) Fix this by offloadinig handshake work to a background thread. Reported-by: Yan Jin <jinyan12@huawei.com> Suggested-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Chuan Zheng <zhengchuan@huawei.com> Message-Id: <1604643893-8223-1-git-send-email-zhengchuan@huawei.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12migration/ram: Fix hexadecimal format string specifierPhilippe Mathieu-Daudé
The '%u' conversion specifier is for decimal notation. When prefixing a format with '0x', we want the hexadecimal specifier ('%x'). Inspired-by: Dov Murik <dovmurik@linux.vnet.ibm.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20201103112558.2554390-5-philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-11Reduce the time of checkpoint for COLORao, Lei
we should set ram_bulk_stage to false after ram_state_init, otherwise the bitmap will be unused in migration_bitmap_find_dirty. all pages in ram cache will be flushed to the ram of secondary guest for each checkpoint. Signed-off-by: Lei Rao <lei.rao@intel.com> Signed-off-by: Derek Su <dereksu@qnap.com> Signed-off-by: Zhang Chen <chen.zhang@intel.com> Reviewed-by: Li Zhijian <lizhijian@cn.fujitsu.com> Reviewed-by: Zhang Chen <chen.zhang@intel.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
2020-11-02migration: Postpone the kick of the fault thread after recoverPeter Xu
The new migrate_send_rp_req_pages_pending() call should greatly improve destination responsiveness because it will resync faulted address after postcopy recovery. However it is also the 1st place to initiate the page request from the main thread. One thing is overlooked on that migrate_send_rp_message_req_pages() is not designed to be thread-safe. So if we wake the fault thread before syncing all the faulted pages in the main thread, it means they can race. Postpone the wake up operation after the sync of faulted addresses. Fixes: 0c26781c09 ("migration: Sync requested pages after postcopy recovery") Tested-by: Christian Schoenebeck <qemu_oss@crudebyte.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20201102153010.11979-3-peterx@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-02migration: Unify reset of last_rb on destination node when recoverPeter Xu
When postcopy recover happens, we need to reset last_rb after each return of postcopy_pause_fault_thread() because that means we just got the postcopy migration continued. Unify this reset to the place right before we want to kick the fault thread again, when we get the command MIG_CMD_POSTCOPY_RESUME from source. This is actually more than that - because the main thread on destination will now be able to call migrate_send_rp_req_pages_pending() too, so the fault thread is not the only user of last_rb now. Move the reset earlier will allow the first call to migrate_send_rp_req_pages_pending() to use the reset value even if called from the main thread. (NOTE: this is not a real fix to 0c26781c09 mentioned below, however it is just a mark that when picking up 0c26781c09 we'd better have this one too; the real fix will come later) Fixes: 0c26781c09 ("migration: Sync requested pages after postcopy recovery") Tested-by: Christian Schoenebeck <qemu_oss@crudebyte.com> Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20201102153010.11979-2-peterx@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-01qapi: Add VFIO devices migration stats in Migration statsKirti Wankhede
Added amount of bytes transferred to the VM at destination by all VFIO devices Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2020-10-27Merge remote-tracking branch ↵Peter Maydell
'remotes/dgilbert/tags/pull-migration-20201026a' into staging migration pull: 2020-10-26 Another go at Peter's postcopy fixes Cleanups from Bihong Yu and Peter Maydell. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> # gpg: Signature made Mon 26 Oct 2020 16:17:03 GMT # gpg: using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7 # gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full] # Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A 9FA9 0516 331E BC5B FDE7 * remotes/dgilbert/tags/pull-migration-20201026a: migration-test: Only hide error if !QTEST_LOG migration/postcopy: Release fd before going into 'postcopy-pause' migration: Sync requested pages after postcopy recovery migration: Maintain postcopy faulted addresses migration: Introduce migrate_send_rp_message_req_pages() migration: Pass incoming state into qemu_ufd_copy_ioctl() migration: using trace_ to replace DPRINTF migration: Delete redundant spaces migration: Open brace '{' following function declarations go on the next line migration: Do not initialise statics and globals to 0 or NULL migration: Add braces {} for if statement migration: Open brace '{' following struct go on the same line migration: Add spaces around operator migration: Don't use '#' flag of printf format migration: Do not use C99 // comments migration: Drop unused VMSTATE_FLOAT64 support Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2020-10-26Merge remote-tracking branch 'remotes/ericb/tags/pull-bitmaps-2020-10-26' ↵Peter Maydell
into staging bitmaps patches for 2020-10-26 - fix infloop on large bitmap granularity - silence compiler warning # gpg: Signature made Mon 26 Oct 2020 11:56:54 GMT # gpg: using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A # gpg: Good signature from "Eric Blake <eblake@redhat.com>" [full] # gpg: aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>" [full] # gpg: aka "[jpeg image of size 6874]" [full] # Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2 F3AA A7A1 6B4A 2527 436A * remotes/ericb/tags/pull-bitmaps-2020-10-26: migration/block-dirty-bitmap: fix uninitialized variable warning migration/block-dirty-bitmap: fix larger granularity bitmaps Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 04:57:11 +0000