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2013-03-11qga: add guest-set-time commandLei Li3-0/+86
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> *added stub for w32 Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-03-11qga: add guest-get-time commandLei Li3-0/+35
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> *added stub for w32 Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-03-11qemu-ga: use key-value store to avoid recycling fd handles after restartMichael Roth3-6/+204
Hosts hold on to handles provided by guest-file-open for periods that can span beyond the life of the qemu-ga process that issued them. Since these are issued starting from 0 on every restart, we run the risk of issuing duplicate handles after restarts/reboots. As a result, users with a stale copy of these handles may end up reading/writing corrupted data due to their existing handles effectively being re-assigned to an unexpected file or offset. We unfortunately do not issue handles as strings, but as integers, so a solution such as using UUIDs can't be implemented without introducing a new interface. As a workaround, we fix this by implementing a persistent key-value store that will be used to track the value of the last handle that was issued across restarts/reboots to avoid issuing duplicates. The store is automatically written to the same directory we currently set via --statedir to track fsfreeze state, and so should be applicable for stable releases where this flag is supported. A follow-up can use this same store for handling fsfreeze state, but that change is cosmetic and left out for now. Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Cc: qemu-stable@nongnu.org * fixed guest_file_handle_add() return value from uint64_t to int64_t
2013-03-11qemu-ga: make guest-sync-delimited available during fsfreezeMichael Roth1-0/+1
We currently maintain a whitelist of commands that are safe during fsfreeze. During fsfreeze, we disable all commands that aren't part of that whitelist. guest-sync-delimited meets the criteria for being whitelisted, and is also required for qemu-ga clients that rely on guest-sync-delimited for re-syncing the channel after a timeout. Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Cc: qemu-stable@nongnu.org Reviewed-by: Eric Blake <eblake@redhat.com>
2013-03-11qemu-ga: fix confusing GAChannelMethod comparisonStefan Hajnoczi1-1/+1
In commit 7868e26e5930f49ca942311885776b938dcf3b77 ("qemu-ga: add initial win32 support") support was added for qemu-ga on Windows using virtio-serial. Other channel methods (ISA serial and UNIX domain socket) are not supported on Windows. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-03-11qga: cast to int for DWORD typeLei Li1-1/+1
This patch fixes a compiler warning when cross-build: qga/service-win32.c: In function 'printf_win_error': qga/service-win32.c:32:5: warning: format '%d' expects argument of type 'int', but argument 3 has type 'DWORD' [-Wformat] Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-03-11Merge remote-tracking branch 'quintela/migration.next' into stagingAnthony Liguori18-624/+402
# By Paolo Bonzini (40) and others # Via Juan Quintela * quintela/migration.next: (46 commits) page_cache: dup memory on insert page_cache: fix memory leak Fix cache_resize to keep old entry age Fix page_cache leak in cache_resize migration: inline migrate_fd_close migration: eliminate s->migration_file migration: move contents of migration_close to migrate_fd_cleanup migration: move rate limiting to QEMUFile migration: small changes around rate-limiting migration: use qemu_ftell to compute bandwidth migration: use QEMUFile for writing outgoing migration data migration: use QEMUFile for migration channel lifetime qemu-file: simplify and export qemu_ftell qemu-file: add writable socket QEMUFile qemu-file: check exit status when closing a pipe QEMUFile qemu-file: fsync a writable stdio QEMUFile migration: merge qemu_popen_cmd with qemu_popen migration: use qemu_file_rate_limit consistently migration: remove useless qemu_file_get_error check migration: detect error before sleeping ...
2013-03-11arm: fix compilation with CONFIG_FDTPaolo Bonzini1-1/+0
A conflict was resolved the wrong way when merging commit 320ba5f (build: always link device_tree.o into emulators if libfdt available, 2013-02-05). This causes a build failure for the arm-softmmu target due to multiply defined symbol. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1362997886-9470-1-git-send-email-pbonzini@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-03-11page_cache: dup memory on insertPeter Lieven3-4/+4
The page cache frees all data on finish, on resize and if there is collision on insert. So it should be the caches responsibility to dup the data that is stored in the cache. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11page_cache: fix memory leakPeter Lieven1-0/+3
XBZRLE encoded migration introduced a MRU page cache meachnism. Unfortunately, cached items where never freed in case of a collision in the page cache on cache_insert(). This lead to out of memory conditions during XBZRLE migration if the page cache was small and there where a lot of collisions in the cache. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11Fix cache_resize to keep old entry ageOrit Wasserman1-10/+9
Instead of using cache_insert do the update itself Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11Fix page_cache leak in cache_resizeOrit Wasserman1-0/+1
Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: inline migrate_fd_closePaolo Bonzini1-12/+2
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: eliminate s->migration_filePaolo Bonzini6-56/+11
The indirection is useless now. Backends can open s->file directly. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: move contents of migration_close to migrate_fd_cleanupPaolo Bonzini1-10/+7
With this patch, the migration_file is not needed anymore. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: move rate limiting to QEMUFilePaolo Bonzini4-99/+21
Rate limiting is now simply a byte counter; client call qemu_file_rate_limit() manually to determine if they have to exit. So it is possible and simple to move the functionality to QEMUFile. This makes the remaining functionality of s->file redundant; in the next patch we can remove it and write directly to s->migration_file. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: small changes around rate-limitingPaolo Bonzini1-8/+11
This patch extracts a few small changes from the next patch, which are unrelated to adding generic rate-limiting functionality to QEMUFile. Make migration_set_rate_limit a simple accessor, and use qemu_file_set_rate_limit consistently. Also fix a typo where INT_MAX should have been SIZE_MAX. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_ftell to compute bandwidthPaolo Bonzini1-1/+3
Prepare for when s->bytes_xfer will be removed. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use QEMUFile for writing outgoing migration dataPaolo Bonzini6-90/+8
Second, drop the file descriptor indirection, and write directly to the QEMUFile. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use QEMUFile for migration channel lifetimePaolo Bonzini7-89/+21
As a start, use QEMUFile to store the destination and close it. qemu_get_fd gets a file descriptor that will be used by the write callbacks. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: simplify and export qemu_ftellPaolo Bonzini1-12/+8
Force a flush when qemu_ftell is called. This simplifies the buffer magic (it also breaks qemu_ftell for input QEMUFiles, but we never use it). Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: add writable socket QEMUFilePaolo Bonzini4-5/+34
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: check exit status when closing a pipe QEMUFilePaolo Bonzini3-4/+10
This is what exec_close does. Move this to the underlying QEMUFile. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: fsync a writable stdio QEMUFilePaolo Bonzini1-0/+18
This is what fd_close does. Prepare for switching to a QEMUFile. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: merge qemu_popen_cmd with qemu_popenPaolo Bonzini3-21/+12
There is no reason for outgoing exec migration to do popen manually anymore (the reason used to be that we needed the FILE* to make it non-blocking). Use qemu_popen_cmd. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_file_rate_limit consistentlyPaolo Bonzini1-2/+2
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: remove useless qemu_file_get_error checkPaolo Bonzini1-6/+0
migration_put_buffer is never called if there has been an error. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: detect error before sleepingPaolo Bonzini1-3/+4
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: eliminate last_roundPaolo Bonzini1-6/+5
We will go around the loop exactly once after setting last_round. Eliminate the variable altogether. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: make qemu_fflush and qemu_file_set_error private againPaolo Bonzini2-4/+2
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11Rename buffered_ to migration_Juan Quintela1-16/+16
This is consistent once that we have moved everything to migration.c Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: yay, buffering is gonePaolo Bonzini3-61/+22
Buffering was needed because blocking writes could take a long time and starve other threads seeking to grab the big QEMU mutex. Now that all writes (except within _complete callbacks) are done outside the big QEMU mutex, we do not need buffering at all. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: run setup callbacks out of big lockPaolo Bonzini5-7/+12
Only the migration_bitmap_sync() call needs the iothread lock. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: run pending/iterate callbacks out of big lockPaolo Bonzini4-4/+52
This makes it possible to do blocking writes directly to the socket, with no buffer in the middle. For RAM, only the migration_bitmap_sync() call needs the iothread lock. For block migration, it is needed by the block layer (including bdrv_drain_all and dirty bitmap access), but because some code is shared between iterate and complete, all of mig_save_device_dirty is run with the lock taken. In the savevm case, the iterate callback runs within the big lock. This is annoying because it complicates the rules. Luckily we do not need to do anything about it: the RAM iterate callback does not need the iothread lock, and block migration never runs during savevm. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: reorder SaveVMHandlers membersPaolo Bonzini1-3/+5
This groups together the callbacks that later will have similar locking rules. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11block-migration: add lockPaolo Bonzini2-3/+52
Some state is shared between the block migration code and its AIO callbacks. Once block migration will run outside the iothread, the block migration code and the AIO callbacks will be able to run concurrently. Protect the critical sections with a separate lock. Do the same for completed_sectors, which can be used from the monitor. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11block-migration: document usage of state across threadsPaolo Bonzini1-5/+18
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11block-migration: small preparatory changes for lockingPaolo Bonzini1-11/+15
Some small changes that will simplify the positioning of lock/unlock primitives. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11block-migration: remove variables that are never readPaolo Bonzini1-13/+0
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: cleanup migration (including thread) in the iothreadPaolo Bonzini2-18/+21
Perform final cleanup in a bottom half, and add joining the thread to the series of cleanup actions. migrate_fd_error remains for connection error, but it doesn't need to cleanup anything anymore. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: prepare to access s->state outside critical sectionsPaolo Bonzini1-12/+21
Accessing s->state outside the big QEMU lock will simplify a bit the locking/unlocking of the iothread lock. We need to keep the lock in migrate_fd_error and migrate_fd_completed, however, because they call migrate_fd_cleanup. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: add migrate_set_state tracepointKazuya Saito2-1/+11
Signed-off-by: Kazuya Saito <saito.kazuya@jp.fujitsu.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: do not nest flushing of device dataPaolo Bonzini1-31/+24
Completion of migration is currently done with a "nested" loop that invokes buffered_flush: migrate_fd_completed is called by buffered_file_thread, which calls migrate_fd_cleanup, which calls buffered_close (via qemu_fclose), which flushes the buffer. Simplify this, by reusing the buffered_flush call of buffered_file_thread. Then if qemu_savevm_state_complete was called, and the buffer is empty (including the QEMUFile buffer, for which we need the previous patch), we are done. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: simplify error handlingPaolo Bonzini2-33/+14
Always use qemu_file_get_error to detect errors, since that is how QEMUFile itself drops I/O after an error occurs. There is no need to propagate and check return values all the time. Also remove the "complete" member, since we know that it is set (via migrate_fd_cleanup) only when the state changes. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_file_set_errorPaolo Bonzini1-16/+6
Remove the return value of buffered_flush, pass it via the error code of s->file. Once this is done, the error can be retrieved simply via migrate_fd_close's call to qemu_fclose. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: flush all data to fd when buffered_flush is calledPaolo Bonzini1-0/+2
Including data that resided in the QEMUFile's own buffer. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: temporarily expose qemu_file_set_error and qemu_fflushPaolo Bonzini2-2/+4
Right now, migration cannot entirely rely on QEMUFile's automatic drop of I/O after an error, because it does its "real" I/O outside the put_buffer callback. To fix this until buffering is gone, expose qemu_file_set_error which we will use in buffered_flush. Similarly, buffered_flush is not a complete flush because some data may still reside in the QEMUFile's own buffer. This somewhat complicates the process of closing the migration thread. Again, when buffering is gone buffered_flush will disappear and calling qemu_fflush will not be needed; in the meanwhile, we expose the function for use in migration.c. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_file_set_error to pass error codes back to qemu_savevm_statePaolo Bonzini2-29/+21
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11qemu-file: pass errno from qemu_fflush via f->last_errorPaolo Bonzini1-13/+12
This is done by almost all callers of qemu_fflush, move the code directly to qemu_fflush. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11block-migration: remove useless calls to blk_mig_cleanupPaolo Bonzini1-18/+8
Now that the cancel callback is called consistently for all errors, we can avoid doing its work in the other callbacks. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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