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2016-10-13migration: Report values for comparisonsDr. David Alan Gilbert
Report the values when a comparison fails; together with the previous patch that prints the device and field names this should give a good idea of why loading the migration failed. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2016-10-13migration: report an error giving the failed fieldDr. David Alan Gilbert
When a field fails to load (typically due to a limit check, or a call to a get/put) report the device and field to give an indication of the cause. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2016-06-17migration: Trace improvementsDr. David Alan Gilbert
A couple of improvements to tracing that have come out of helping people with migration problems: * vmstate_n_elems trace the count/name - for when you have problems getting array counts right * vmstate_subsection_load_bad - add the idstr, for when you receive a subsection you weren't expecting. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <1465896986-16132-1-git-send-email-dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
2016-05-23migration: Move qjson.[ch] to migration/Markus Armbruster
Type QJSON lets you build JSON text. Its interface mirrors (a subset of) abstract JSON syntax. QAPI output visitors also produce JSON text. They assert their preconditions and invariants, and therefore abort on incorrect use. Contrastingly, QJSON does *not* detect incorrect use. It happily produces invalid JSON then. This is what migration wants. QJSON was designed for migration, and migration is its only user. Move it to migration/ for proper coverage by MAINTAINERS, and to deter accidental use outside migration. [Pointed out by Eric: QJSON was added in commits 0457d07..b174257 -- Amit] Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <1462380558-2030-2-git-send-email-armbru@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
2016-01-29migration: Clean up includesPeter Maydell
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1453832250-766-2-git-send-email-peter.maydell@linaro.org
2016-01-16vmstate: Introduce VMSTATE_VARRAY_MULTPLYJuan Quintela
This allows to send a partial array where the size is another structure field multiplied by a constant. Signed-off-by: Juan Quintela <quintela@redhat.com> [PMM: updated to current master] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
2016-01-16vmstate: introduce CPU_DoubleU arraysJuan Quintela
Add vmstate support for migrating arrays of CPU_DoubleU via VMSTATE_CPUDOUBLE_ARRAY. Signed-off-by: Juan Quintela <quintela@redhat.com> [PMM: rebased, since files have all moved since 2012; added VMSTATE_CPUDOUBLE_ARRAY_V for consistency with FLOAT64] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
2015-07-07vmstate: Create optional sectionsJuan Quintela
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>
2015-06-12Move copy out of qemu_peek_bufferDr. David Alan Gilbert
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>
2015-06-12migration: Use normal VMStateDescriptions for SubsectionsJuan Quintela
We create optional sections with this patch. But we already have optional subsections. Instead of having two mechanism that do the same, we can just generalize it. For subsections we just change: - Add a needed function to VMStateDescription - Remove VMStateSubsection (after removal of the needed function it is just a VMStateDescription) - Adjust the whole tree, moving the needed function to the corresponding VMStateDescription Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-02-05migration: Append JSON description of migration streamAlexander Graf
One of the annoyances of the current migration format is the fact that it's not self-describing. In fact, it's not properly describing at all. Some code randomly scattered throughout QEMU elaborates roughly how to read and write a stream of bytes. We discussed an idea during KVM Forum 2013 to add a JSON description of the migration protocol itself to the migration stream. This patch adds a section after the VM_END migration end marker that contains description data on what the device sections of the stream are composed of. This approach is backwards compatible with any QEMU version reading the stream, because QEMU just stops reading after the VM_END marker and ignores any data following it. With an additional external program this allows us to decipher the contents of any migration stream and hopefully make migration bugs easier to track down. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-02-05Migration: Add lots of trace eventsDr. David Alan Gilbert
Mostly on the load side, so that when we get a complaint about a migration failure we can figure out what it didn't like. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2015-02-05savevm: Convert fprintf to error_reportDr. David Alan Gilbert
Convert a bunch of fprintfs to error_reports Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-12-16Start migrating migration code into a migration directoryDr. David Alan Gilbert
The migration code now occupies a fair chunk of the top level .c files, it seems time to give it it's own directory. I've not touched: arch_init.c - that's mostly RAM migration but has a few random other bits savevm.c - because it's built target specific This is purely a code move; no code has changed. - it fails checkpatch because of old violations, it feels safer to keep this as purely a move and fix those at some mythical future date. The xbzrle and vmstate tests are now only run for softmmu builds since they require files in the migrate/ directory which is only built for softmmu. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com>
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