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2015-09-11maint: avoid useless "if (foo) free(foo)" patternDaniel P. Berrange1-6/+2
The free() and g_free() functions both happily accept NULL on any platform QEMU builds on. As such putting a conditional 'if (foo)' check before calls to 'free(foo)' merely serves to bloat the lines of code. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2015-09-11maint: remove / fix many doubled wordsDaniel P. Berrange1-1/+1
Many source files have doubled words (eg "the the", "to to", and so on). Most of these can simply be removed, but a couple were actual mis-spellings (eg "to to" instead of "to do"). There was even one triple word score "to to to" :-) Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2015-08-03migration: Fix global state with Xen.Anthony PERARD2-0/+8
When doing migration via the QMP command xen_save_devices_state, the current runstate is not store into the global state section. Also the current runstate is not the one we want on the receiver side. During migration, the Xen toolstack paused QEMU before save the devices state. Also, the toolstack expect QEMU to autostart when the migration is finished. So this patch store "running" as it's current runstate. Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2015-07-24rcu: actually register threads that have RCU read-side critical sectionsPaolo Bonzini1-0/+4
Otherwise, grace periods are detected too early! Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-07-16RDMA: Fix error exitsDr. David Alan Gilbert1-4/+4
The error checks I added used 'break' after the error, but I'm in a switch inside the while loop, so they need to be 'goto out'. Spotted by coverity; entries 1311368 and 1311369 Fixes: afcddefd Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <1436555332-19076-1-git-send-email-dgilbert@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-07-15migration: We also want to store the global state for savevmJuan Quintela2-1/+7
Commit df4b1024526cae3479da3492d6371fd4a7324a03 introduced global_state section. But it only filled the state while doing migration. While doing a savevm, we stored an empty string as state. So when we did a loadvm, it complained that state was invalid. Fedora 21, 4.1.1, qemu 2.4.0-rc0 > ../../configure --target-list="x86_64-softmmu" 068 2s ... - output mismatch (see 068.out.bad) --- /home/bos/jhuston/src/qemu/tests/qemu-iotests/068.out 2015-07-08 17:56:18.588164979 -0400 +++ 068.out.bad 2015-07-09 17:39:58.636651317 -0400 @@ -6,6 +6,8 @@ QEMU X.Y.Z monitor - type 'help' for more information (qemu) savevm 0 (qemu) quit +qemu-system-x86_64: Unknown savevm section or instance 'globalstate' 0 +qemu-system-x86_64: Error -22 while loading VM state QEMU X.Y.Z monitor - type 'help' for more information (qemu) quit *** done Failures: 068 Failed 1 of 1 tests Actually, there were two problems here: - we registered global_state too late for load_vm (fixed on another patch on the list) - we didn't store a valid state for savevm (fixed by this patch). Reported-by: John Snow <jsnow@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
2015-07-15migration: reduce the count of strlen callLiang Li1-5/+5
'strlen' is called three times in 'save_page_header', it's inefficient. Signed-off-by: Liang Li <liang.z.li@intel.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-15migration: Trace event and migration event are different thingsJuan Quintela1-1/+1
We can want the trace event even without migration events enabled. Reported-by: Wen Congyang <ghostwcy@gmail.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-15migration: Only change state after migration has finishedJuan Quintela1-21/+27
On previous change, we changed state at post load time if it was not running, special casing the "running" change. Now, we change any states at the end of the migration. Signed-off-by: Juan Quintela <quintela@redhat.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
2015-07-09migration: fix RCU deadlockPaolo Bonzini1-1/+2
migration_end calls synchronize_rcu() within a critical section. That causes a deadlock; move the call after rcu_read_unlock(). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-07-07Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into ↵Peter Maydell1-1/+1
staging Pull request v2: * Drop block/nfs patch since it exposes an unfinished QAPI interface [kwolf] # gpg: Signature made Tue Jul 7 14:29:47 2015 BST using RSA key ID 81AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" * remotes/stefanha/tags/block-pull-request: blockjob: add block_job_release function block/raw-posix: Don't think /dev/fd/<NN> is a floppy drive. block: Use bdrv_drain to replace uncessary bdrv_drain_all block: Initialize local_err in bdrv_append_temp_snapshot block: update bdrv_drain_all()/bdrv_drain() comments qcow2: remove unnecessary check Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2015-07-07block: Use bdrv_drain to replace uncessary bdrv_drain_allFam Zheng1-1/+1
There callers work on a single BlockDriverState subtree, where using bdrv_drain() is more accurate. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-07-07migration: extend migration_bitmapLi Zhijian1-0/+28
Prevously, if we hotplug a device(e.g. device_add e1000) during migration is processing in source side, qemu will add a new ram block but migration_bitmap is not extended. In this case, migration_bitmap will overflow and lead qemu abort unexpectedly. Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07migration: protect migration_bitmapLi Zhijian1-6/+17
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07check_section_footers: Check the correct section_idDr. David Alan Gilbert1-37/+37
The section footers check was incorrectly checking the section_id in the SaveStateEntry not the LoadStateEntry. These can validly be different if the two QEMU instances have instantiated their devices in a different order. The test only cares that we're finishing the same section we started, and hence it's the LoadStateEntry that we care about. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reported-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07migration: Add migration events on target sideJuan Quintela1-1/+4
We reuse the migration events from the source side, sending them on the appropiate place. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: Make events a capabilityJuan Quintela1-2/+18
Make check fails with events. THis is due to the parser/lexer that it uses. Just in case that they are more broken parsers, just only send events when there are capabilities. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: create migration eventJuan Quintela1-0/+2
We have one argument that tells us what event has happened. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2015-07-07migration: No need to call trace_migrate_set_state()Juan Quintela1-2/+0
We now use the helper everywhere, so no need to call this on this two places. See on previous commit that there were a place where we missed to mark the trace. Now all tracing is done in migrate_set_state(). Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: Use always helper to set stateJuan Quintela1-3/+3
There were three places that were not using the migrate_set_state() helper, just fix that. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: ensure we start in NONE stateJuan Quintela1-1/+6
Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: Use cmpxchg correctlyJuan Quintela1-1/+1
cmpxchg returns the old value Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: Add configuration sectionJuan Quintela1-0/+61
It needs to be the first one and it is not optional, that is the reason why it is opencoded. For new machine types, it is required that machine type name is the same in both sides. It is just done right now for pc's. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07vmstate: Create optional sectionsJuan Quintela2-0/+19
To make sections optional, we need to do it at the beggining of the code. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07global_state: Make section optionalJuan Quintela1-0/+29
This section would be sent: a- for all new machine types b- for old machine types if section state is different form {running,paused} that were the only giving us troubles. So, in new qemus: it is alwasy there. In old qemus: they are only there if it an error has happened, basically stoping on target. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07migration: create new section to store global stateJuan Quintela1-7/+98
This includes a new section that for now just stores the current qemu state. Right now, there are only one way to control what is the state of the target after migration. - If you run the target qemu with -S, it would start stopped. - If you run the target qemu without -S, it would run just after migration finishes. The problem here is what happens if we start the target without -S and there happens one error during migration that puts current state as -EIO. Migration would ends (notice that the error happend doing block IO, network IO, i.e. nothing related with migration), and when migration finish, we would just "continue" running on destination, probably hanging the guest/corruption data, whatever. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2015-07-07Fail more cleanly in mismatched RAM casesDr. David Alan Gilbert1-0/+2
If the number of RAMBlocks was different on the source from the destination, QEMU would hang waiting for a disconnect on the source and wouldn't release from that hang until the destination was manually killed. Mark the stream as being in error, this causes the destination to die and the source to carry on. (It still gets a whole bunch of warnings on the destination, and I've not managed to complete another migration after the 1st one, still progress). Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Sanity check RDMA remote dataDr. David Alan Gilbert1-0/+30
Perform some basic (but probably not complete) sanity checking on requests from the RDMA source. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Sort destination RAMBlocks to be the same as the sourceDr. David Alan Gilbert1-28/+73
Use the order of incoming RAMBlocks from the source to record an index number; that then allows us to sort the destination local RAMBlock list to match the source. Now that the RAMBlocks are known to be in the same order, this simplifies the RDMA Registration step which previously tried to match RAMBlocks based on offset (which isn't guaranteed to match). Looking at the existing compress code, I think it was erroneously relying on an assumption of matching ordering, which this fixes. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Rework ram block hashDr. David Alan Gilbert1-12/+20
RDMA uses a hash from block offset->RAM Block; this isn't needed on the destination, and it becomes harder to maintain after the next patch in the series that sorts the block list. Split the hash so that it's only generated on the source. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Allow rdma_delete_block to work without the hashDr. David Alan Gilbert1-11/+16
In the next patch we remove the hash on the destination, rdma_delete_block does two things with the hash which can be avoided: a) The caller passes the offset and rdma_delete_block looks it up in the hash; fixed by getting the caller to pass the block b) The hash gets recreated after deletion; fixed by making that conditional on the hash being initialised. While this function is currently only used during cleanup, Michael asked that we keep it general for future dynamic block registration work. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Rework ram_control_load_hook to hook during block loadDr. David Alan Gilbert3-12/+36
We need the names of RAMBlocks as they're loaded for RDMA, reuse a slightly modified ram_control_load_hook: a) Pass a 'data' parameter to use for the name in the block-reg case b) Only some hook types now require the presence of a hook function. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Translate offsets to destination address spaceDr. David Alan Gilbert1-7/+24
The 'offset' field in RDMACompress and 'current_addr' field in RDMARegister are commented as being offsets within a particular RAMBlock, however they appear to actually be offsets within the ram_addr_t space. The code currently assumes that the offsets on the source/destination match, this change removes the need for the assumption for these structures by translating the addresses into the ram_addr_t space of the destination host. Note: An alternative would be to change the fields to actually take the data they're commented for; this would potentially be simpler but would break stream compatibility for those cases that currently work. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Store block name in local blocks structureDr. David Alan Gilbert1-14/+21
In a later patch the block name will be used to match up two views of the block list. Keep a copy of the block name with the local block list. (At some point it could be argued that it would be best just to let migration see the innards of RAMBlock and avoid the need to use foreach). Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07rdma typosDr. David Alan Gilbert1-3/+3
A couple of typo fixes. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07Only try and read a VMDescription if it should be thereDr. David Alan Gilbert1-9/+28
The VMDescription section maybe after the EOF mark, the current code does a 'qemu_get_byte' and either gets the header byte identifying the description or an error (which it ignores). Doing the 'get' upsets RDMA which hangs on old machine types without the VMDescription. Just avoid reading the VMDescription if we wouldn't send it. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-07-07rdma: fix memory leakGonglei1-1/+2
Variable "r" going out of scope leaks the storage it points to in line 3268. Signed-off-by: Gonglei <arei.gonglei@huawei.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-22Include monitor/monitor.h exactly where neededMarkus Armbruster1-1/+0
In particular, don't include it into headers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-06-22Include qapi/qmp/qerror.h exactly where neededMarkus Armbruster2-0/+2
In particular, don't include it into headers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-06-22qerror: Move #include out of qerror.hMarkus Armbruster5-0/+5
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-06-22qerror: Clean up QERR_ macros to expand into a single stringMarkus Armbruster2-18/+19
These macros expand into error class enumeration constant, comma, string. Unclean. Has been that way since commit 13f59ae. The error class is always ERROR_CLASS_GENERIC_ERROR since the previous commit. Clean up as follows: * Prepend every use of a QERR_ macro by ERROR_CLASS_GENERIC_ERROR, and delete it from the QERR_ macro. No change after preprocessing. * Rewrite error_set(ERROR_CLASS_GENERIC_ERROR, ...) into error_setg(...). Again, no change after preprocessing. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-06-12Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into ↵Peter Maydell5-15/+14
staging # gpg: Signature made Fri Jun 12 13:57:20 2015 BST using RSA key ID 81AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" * remotes/stefanha/tags/net-pull-request: qmp/hmp: add rocker device support rocker: bring link up/down on PHY enable/disable rocker: update tests using hw-derived interface names rocker: Add support for phys name iohandler: Change return type of qemu_set_fd_handler to "void" event-notifier: Always return 0 for posix implementation xen_backend: Remove unused error handling of qemu_set_fd_handler oss: Remove unused error handling of qemu_set_fd_handler alsaaudio: Remove unused error handling of qemu_set_fd_handler main-loop: Drop qemu_set_fd_handler2 Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler tap: Drop tap_can_send net/socket: Drop net_socket_can_send netmap: Drop netmap_can_send l2tpv3: Drop l2tpv3_can_send stubs: Add qemu_set_fd_handler Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2015-06-12Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handlerFam Zheng5-15/+14
Done with following Coccinelle semantic patch, plus manual cosmetic changes in net/*.c. @@ expression E1, E2, E3, E4; @@ - qemu_set_fd_handler2(E1, NULL, E2, E3, E4); + qemu_set_fd_handler(E1, E2, E3, E4); Signed-off-by: Fam Zheng <famz@redhat.com> Message-id: 1433400324-7358-8-git-send-email-famz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-06-12Remove unneeded memsetDr. David Alan Gilbert1-1/+0
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Rename RDMA structures to make destination clearDr. David Alan Gilbert1-33/+33
RDMA has two data types that are named confusingly; RDMALocalBlock (pointed to indirectly by local_ram_blocks) RDMARemoteBlock (pointed to by block in RDMAContext) RDMALocalBlocks, as the name suggests is a data strucuture that represents the RDMAable RAM Blocks on the current side of the migration whichever that is. RDMARemoteBlocks is always the shape of the RAMBlocks on the destination, even on the destination. Rename: RDMARemoteBlock -> RDMADestBlock context->'block' -> context->dest_blocks Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Add a protective section footerDr. David Alan Gilbert1-0/+61
Badly formatted migration streams can go undetected or produce misleading errors due to a lock of checking at the end of sections. In particular a section that adds an extra 0x00 at the end causes what looks like a normal end of stream and thus doesn't produce any errors, and something that ends in a 0x01..0x04 kind of look like real section headers and then fail when the section parser tries to figure out which section they are. This is made worse by the choice of 0x00..0x04 being small numbers that are particularly common in normal section data. This patch adds a section footer consisting of a marker (0x7e - ~) followed by the section-id that was also sent in the header. If they mismatch then it throws an error explaining which section was being loaded. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Disable section footers on older machine typesDr. David Alan Gilbert1-0/+7
The next patch adds section footers; but we don't want to break migration compatibility so disable them on older machine types Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Merge section header writingDr. David Alan Gilbert1-44/+28
The header writing for device sections is open coded in a few places, merge it into one. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Move loadvm_handlers into MigrationIncomingStateDr. David Alan Gilbert2-12/+18
In postcopy we need the loadvm_handlers to be used in a couple of different instances of the loadvm loop/routine, and thus it can't be local any more. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-06-12Move copy out of qemu_peek_bufferDr. David Alan Gilbert2-7/+10
qemu_peek_buffer currently copies the data it reads into a buffer, however a future patch wants access to the buffer without the copy, hence rework to remove the copy to the layer above. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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