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2018-07-05Merge remote-tracking branch ↵Peter Maydell
'remotes/armbru/tags/pull-monitor-2018-07-03-v2' into staging Monitor patches for 2018-07-03 # gpg: Signature made Tue 03 Jul 2018 22:20:13 BST # gpg: using RSA key 3870B400EB918653 # gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" # gpg: aka "Markus Armbruster <armbru@pond.sub.org>" # Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653 * remotes/armbru/tags/pull-monitor-2018-07-03-v2: (32 commits) qapi: Polish command flags documentation in qapi-code-gen.txt monitor: Improve some comments qmp: Clean up capability negotiation after commit 02130314d8c qobject: Let qobject_from_jsonf() fail instead of abort qmp: Switch timestamp_put() to qdict_from_jsonf_nofail() qmp: Add some comments around null responses qmp: Simplify monitor_qmp_respond() qmp: Replace get_qmp_greeting() by qmp_greeting() qmp: Replace monitor_json_emitter{,raw}() by qmp_{queue,send}_response() qmp: Use QDict * instead of QObject * for response objects qmp: De-duplicate error response building qobject: New qdict_from_jsonf_nofail() monitor: Peel off @mon_global wrapper monitor: Rename use_io_thr to use_io_thread qmp: Don't let JSON errors jump the queue qmp: Don't let malformed in-band commands jump the queue tests/qmp-test: Demonstrate QMP errors jumping the queue qmp: Simplify code around monitor_qmp_dispatch_one() qmp: Always free QMPRequest with qmp_request_free() qmp: Revert change to handle_qmp_command tracepoint ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-05Merge remote-tracking branch 'remotes/armbru/tags/pull-qapi-2018-07-03' into ↵Peter Maydell
staging QAPI patches for 2018-07-03 # gpg: Signature made Tue 03 Jul 2018 21:52:55 BST # gpg: using RSA key 3870B400EB918653 # gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" # gpg: aka "Markus Armbruster <armbru@pond.sub.org>" # Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653 * remotes/armbru/tags/pull-qapi-2018-07-03: qapi: add conditions to SPICE type/commands/events on the schema qapi: add conditions to VNC type/commands/events on the schema qapi: add 'If:' section to generated documentation qapi-types: add #if conditions to types & visitors qapi/events: add #if conditions to events qapi/commands: add #if conditions to commands qapi-introspect: add preprocessor conditions to generated QLit qapi-introspect: modify to_qlit() to append ',' on level > 0 qapi: add #if/#endif helpers qapi: mcgen() shouldn't indent # lines qapi: add 'ifcond' to visitor methods qapi: leave the ifcond attribute undefined until check() qapi: pass 'if' condition into QAPISchemaEntity objects qapi: add 'if' to top-level expressions Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-05file-posix: Unlock FD after creationMax Reitz
Closing the FD does not necessarily mean that it is unlocked. Fix this by relinquishing all permission locks before qemu_close(). Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05file-posix: Fix creation lockingMax Reitz
raw_apply_lock_bytes() takes a bit mask of "permissions that are NOT shared". Also, make the "perm" and "shared" variables uint64_t, because I do not particularly like using ~ on signed integers (and other permission masks are usually uint64_t, too). Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block/blklogwrites: Add an option for the update interval of the log superblockAri Sundholm
This is a way to ensure that the log superblock is periodically updated. Before, this was only done on flush requests, which may not be enough if the VM exits abnormally, omitting the final flush. The default interval is 4096 write requests. Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block/blklogwrites: Add an option for appending to an old logAri Sundholm
Suggested by Kevin Wolf. May be useful when testing multiple batches of writes or doing long-term testing involving restarts of the VM. Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block/blklogwrites: Change log_sector_size from int64_t to uint64_tAri Sundholm
This was a simple oversight when working on intermediate versions of the original patch which introduced blklogwrites. Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block/crypto: Fix memory leak in create error pathKevin Wolf
Fixes: Coverity CID 1393782 Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2018-07-05block: Don't silently truncate node namesKevin Wolf
If the user passes a too long node name string, we silently truncate it to fit into BlockDriverState.node_name, i.e. to 31 characters. Apart from surprising the user when the node has a different name than requested, this also bypasses the check for duplicate names, so that the same name can be assigned to multiple nodes. Fix this by just making too long node names an error. Reported-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block: Add blklogwritesAapo Vienamo
Implements a block device write logging system, similar to Linux kernel device mapper dm-log-writes. The write operations that are performed on a block device are logged to a file or another block device. The write log format is identical to the dm-log-writes format. Currently, log markers are not supported. This functionality can be used for crash consistency and fs consistency testing. By implementing it in qemu, tests utilizing write logs can be be used to test non-Linux drivers and older kernels. The driver accepts an optional parameter to set the sector size used for logging. This makes the driver require all requests to be aligned to this sector size and also makes offsets and sizes of writes in the log metadata to be expressed in terms of this value (the log format has a granularity of one sector for offsets and sizes). This allows accurate logging of writes to guest block devices that have unusual sector sizes. The implementation is based on the blkverify and blkdebug block drivers. Signed-off-by: Aapo Vienamo <aapo@tuxera.com> Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05block: Move two block permission constants to the relevant enumAri Sundholm
This allows using the two constants outside of block.c, which will happen in a subsequent patch. Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05qcow2: add compress threadsVladimir Sementsov-Ogievskiy
Do data compression in separate threads. This significantly improve performance for qemu-img convert with -W (allow async writes) and -c (compressed) options. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05qcow2: refactor data compressionVladimir Sementsov-Ogievskiy
Make a separate function for compression to be parallelized later. - use .avail_out field instead of .next_out to calculate size of compressed data. It looks more natural and it allows to keep dest to be void pointer - set avail_out to be at least one byte less than input, to be sure avoid inefficient compression earlier Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05qemu-img: allow compressed not-in-order writesVladimir Sementsov-Ogievskiy
No reason to forbid them, and they are needed to improve performance with compress-threads in further patches. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-05Merge remote-tracking branch 'remotes/mdroth/tags/qga-pull-2018-07-03-tag' ↵Peter Maydell
into staging qemu-ga patch queue for soft-freeze * add systemd suspend support * add used/total space stats for guest-get-fsinfo * fixes for guest-get-fsinfo over PCI bridges * MSI installer and schema doc fixes * guard against unbounded allocations in guest-file-read * add some additional qga test cases # gpg: Signature made Tue 03 Jul 2018 21:45:32 BST # gpg: using RSA key 3353C9CEF108B584 # gpg: Good signature from "Michael Roth <flukshun@gmail.com>" # gpg: aka "Michael Roth <mdroth@utexas.edu>" # gpg: aka "Michael Roth <mdroth@linux.vnet.ibm.com>" # Primary key fingerprint: CEAC C9E1 5534 EBAB B82D 3FA0 3353 C9CE F108 B584 * remotes/mdroth/tags/qga-pull-2018-07-03-tag: qga: removing bios_supports_mode qga: systemd hibernate/suspend/hybrid-sleep support qga: removing switch statements, adding run_process_child qga: guest_suspend: decoupling pm-utils and sys logic qga: bios_supports_mode: decoupling pm-utils and sys logic qga: refactoring qmp_guest_suspend_* functions qemu-ga: make get-fsinfo work over pci bridges qga-win: Fixing msi upgrade disallow in WiX file qga/schema: fix documentation for GuestOSInfo test-qga: add trivial tests for some commands qga-win: add driver path usage to GuestFilesystemInfo qga: add mountpoint usage info to GuestFilesystemInfo qga: check bytes count read by guest-file-read qga: unset frozen state if no mount points are frozen Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-04Merge remote-tracking branch ↵Peter Maydell
'remotes/vivier2/tags/linux-user-for-3.0-pull-request' into staging Some strace cleanups Minor fixes for setsockopt() and netlink Manage 'F' flag with qemu-binfmt-conf.sh # gpg: Signature made Tue 03 Jul 2018 17:34:20 BST # gpg: using RSA key F30C38BD3F2FBE3C # gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" # gpg: aka "Laurent Vivier <laurent@vivier.eu>" # gpg: aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" # Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F 5173 F30C 38BD 3F2F BE3C * remotes/vivier2/tags/linux-user-for-3.0-pull-request: linux-user/strace: Improve recvmsg() output linux-user/strace: Improve capget()/capset() output linux-user: update do_setsockopt() linux-user: add netlink CARRIER_UP_COUNT/CARRIER_DOWN_COUNT qemu-binfmt-conf.sh: allow to provide a suffix to the interpreter name qemu-binfmt-conf.sh: add persistent (F) flags qemu-binfmt-conf.sh: cleanup --credential Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-04Merge remote-tracking branch ↵Peter Maydell
'remotes/kraxel/tags/audio-20180703-pull-request' into staging audio: hda fixes, timer tracing # gpg: Signature made Tue 03 Jul 2018 13:10:03 BST # gpg: using RSA key 4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/audio-20180703-pull-request: audio: add audio timer trace points audio/hda: fix CID 1393631 audio/hda: adjust larger gaps faster Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-04dirty-bitmap: fix double lock on bitmap enablingVladimir Sementsov-Ogievskiy
Bitmap lock/unlock were added to bdrv_enable_dirty_bitmap in 8b1402ce80d, but some places were not updated correspondingly, which leads to trying to take this lock twice, which is dead-lock. Fix this. Actually, iotest 199 (about dirty bitmap postcopy migration) is broken now, and this fixes it. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20180625165745.25259-3-vsementsov@virtuozzo.com Signed-off-by: John Snow <jsnow@redhat.com>
2018-07-04block/dirty-bitmap: add bdrv_enable_dirty_bitmap_lockedVladimir Sementsov-Ogievskiy
Add _locked version of bdrv_enable_dirty_bitmap, to fix dirty bitmap migration in the following patch. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20180625165745.25259-2-vsementsov@virtuozzo.com Signed-off-by: John Snow <jsnow@redhat.com>
2018-07-03Merge remote-tracking branch ↵Peter Maydell
'remotes/berrange/tags/qcrypto-next-pull-request' into staging Add support for PSK credentials with TLS # gpg: Signature made Tue 03 Jul 2018 13:04:51 BST # gpg: using RSA key BE86EBB415104FDF # gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" # gpg: aka "Daniel P. Berrange <berrange@redhat.com>" # Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E 8E3F BE86 EBB4 1510 4FDF * remotes/berrange/tags/qcrypto-next-pull-request: crypto: Implement TLS Pre-Shared Keys (PSK). Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-07-03qapi: Polish command flags documentation in qapi-code-gen.txtMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-33-armbru@redhat.com>
2018-07-03monitor: Improve some commentsMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-32-armbru@redhat.com>
2018-07-03qmp: Clean up capability negotiation after commit 02130314d8cMarkus Armbruster
qmp_greeting() offers capabilities to the client, and qmp_qmp_capabilities() accepts or denies capabilities requested by the client. The two compute the set of available capabilities independently. Not nice. Clean this up as follows. Compute available capabilities just once in monitor_qmp_caps_reset(), and store them in Monitor member qmp.capab_offered[]. Have qmp_greeting() and qmp_qmp_capabilities() use that. Both are now oblivious of capability details. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-31-armbru@redhat.com>
2018-07-03qobject: Let qobject_from_jsonf() fail instead of abortMarkus Armbruster
qobject_from_jsonf() aborts on error, unlike qobject_from_jsonv(), which returns null. Since all remaining users of qobject_from_jsonf() cope fine with null, change it to return null. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-30-armbru@redhat.com>
2018-07-03qmp: Switch timestamp_put() to qdict_from_jsonf_nofail()Markus Armbruster
There's just one use of qobject_from_jsonf() to parse a JSON object left: timestamp_put(). Switch it to qdict_from_jsonf_nofail(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-29-armbru@redhat.com>
2018-07-03qmp: Add some comments around null responsesMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-28-armbru@redhat.com>
2018-07-03qmp: Simplify monitor_qmp_respond()Markus Armbruster
monitor_qmp_respond() takes both a response object and an error object. If an error object is non-null, the response object must be null, and the response is built from the error object. Of the two callers, one always passes a null response object, and one a null error object. Move building the response object from the error object to the latter, and drop the error object parameter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-27-armbru@redhat.com>
2018-07-03qmp: Replace get_qmp_greeting() by qmp_greeting()Markus Armbruster
get_qmp_greeting() returns a QDict * as QObject *. It's caller converts it right back. Return QDict * instead. While there, rename to qmp_greeting(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-26-armbru@redhat.com>
2018-07-03qmp: Replace monitor_json_emitter{,raw}() by qmp_{queue,send}_response()Markus Armbruster
monitor_json_emitter() and monitor_json_emitter_raw() are unnecessarily general: they can send arbitrary JSON values, even though we only ever use them for QMP, which may send only JSON objects. Specialize the argument from QObject * to QDict *, and rename to qmp_queue_response(), qmp_send_response(). All callers but one lose an upcast. The lone exception gains a downcast; the next commit will get rid of it. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-25-armbru@redhat.com>
2018-07-03qmp: Use QDict * instead of QObject * for response objectsMarkus Armbruster
By using the more specific type, we get fewer downcasts. The downcasts are safe, but not obviously so, at least not locally. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-24-armbru@redhat.com>
2018-07-03qmp: De-duplicate error response buildingMarkus Armbruster
All callers of qmp_build_error_object() duplicate the code to wrap it in a response object. Replace it by qmp_error_response() that captures the duplicated code, including error_free(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-23-armbru@redhat.com>
2018-07-03qobject: New qdict_from_jsonf_nofail()Markus Armbruster
Many uses of qobject_from_jsonf() convert JSON objects. Create new convenience function qdict_from_jsonf_nofail() that includes the conversion to QDict. The next few commits will put it to use. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-22-armbru@redhat.com>
2018-07-03monitor: Peel off @mon_global wrapperMarkus Armbruster
Wrapping global variables in a struct without a use for the wrapper struct buys us nothing but longer lines. Unwrap them. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-21-armbru@redhat.com>
2018-07-03monitor: Rename use_io_thr to use_io_threadMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-20-armbru@redhat.com>
2018-07-03qmp: Don't let JSON errors jump the queueMarkus Armbruster
handle_qmp_command() reports JSON syntax errors right away. This is wrong when OOB is enabled, because the errors can "jump the queue" then. The previous commit fixed the same bug for semantic errors, by delaying the checking until dispatch. We can't delay the checking, so delay the reporting. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-19-armbru@redhat.com>
2018-07-03qmp: Don't let malformed in-band commands jump the queueMarkus Armbruster
handle_qmp_command() reports certain errors right away. This is wrong when OOB is enabled, because the errors can "jump the queue" then, as the previous commit demonstrates. To fix, we need to delay errors until dispatch. Do that for semantic errors, mostly by reverting ill-advised parts of commit cf869d53172 "qmp: support out-of-band (oob) execution". Bonus: doesn't run qmp_dispatch_check_obj() twice, once in handle_qmp_command(), and again in do_qmp_dispatch(). That's also due to commit cf869d53172. The next commit will fix queue jumping for syntax errors. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-18-armbru@redhat.com>
2018-07-03tests/qmp-test: Demonstrate QMP errors jumping the queueMarkus Armbruster
When OOB is enabled, out-of-band commands are executed right away, everything else is queued. This lets out-of-band commands "jump the queue". However, certain errors are always reported right away, and therefore can jump the queue even when the erroneous input does not request out-of-band execution. These errors are pretty unlikely to occur in production, but it's wrong all the same. Mark FIXME. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20180703085358.13941-17-armbru@redhat.com>
2018-07-03qmp: Simplify code around monitor_qmp_dispatch_one()Markus Armbruster
Change monitor_qmp_dispatch_one() to take its parameters unwrapped, move monitor_resume() to the one caller that needs it, rename the function to monitor_qmp_dispatch(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-16-armbru@redhat.com>
2018-07-03qmp: Always free QMPRequest with qmp_request_free()Markus Armbruster
monitor_qmp_dispatch_one() frees a QMPRequest manually, because it needs to keep a reference to ->id. Premature optimization. Take an additional reference so we can use qmp_request_free(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-15-armbru@redhat.com>
2018-07-03qmp: Revert change to handle_qmp_command tracepointMarkus Armbruster
Commit 71da4667db6 "monitor: separate QMP parser and dispatcher" moved the handle_qmp_command tracepoint from handle_qmp_command() to monitor_qmp_dispatch_one(). This delays tracing from enqueue time to dequeue time. Revert that. Dequeue remains adequately visible via tracepoint monitor_qmp_cmd_in_band. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-14-armbru@redhat.com>
2018-07-03qmp: Redo how the client requests out-of-band executionMarkus Armbruster
Commit cf869d53172 "qmp: support out-of-band (oob) execution" added a general mechanism for command-independent arguments just for an out-of-band flag: The "control" key is introduced to store this extra flag. "control" field is used to store arguments that are shared by all the commands, rather than command specific arguments. Let "run-oob" be the first. However, it failed to reject unknown members of "control". For instance, in QMP command {"execute": "query-name", "id": 42, "control": {"crap": true}} "crap" gets silently ignored. Instead of fixing this, revert the general "control" mechanism (because YAGNI), and do it the way I initially proposed, with key "exec-oob". Simpler code, simpler interface. An out-of-band command {"execute": "migrate-pause", "id": 42, "control": {"run-oob": true}} becomes {"exec-oob": "migrate-pause", "id": 42} Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-13-armbru@redhat.com> [Commit message typo fixed]
2018-07-03qmp qemu-ga: Fix qemu-ga not to accept "control"Markus Armbruster
Commit cf869d53172 "qmp: support out-of-band (oob) execution" accidentally made qemu-ga accept and ignore "control". Fix that. Out-of-band execution in a monitor that doesn't support it now fails with {"error": {"class": "GenericError", "desc": "QMP input member 'control' is unexpected"}} instead of {"error": {"class": "GenericError", "desc": "Please enable out-of-band first for the session during capabilities negotiation"}} The old description is suboptimal when out-of-band cannot not be enabled, or the command doesn't support out-of-band execution. The new description is a bit unspecific, but it'll do. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-12-armbru@redhat.com>
2018-07-03tests/test-qga: Demonstrate the guest-agent ignores "control"Markus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-11-armbru@redhat.com>
2018-07-03qmp qemu-ga: Revert change that accidentally made qemu-ga accept "id"Markus Armbruster
Commit cf869d53172 "qmp: support out-of-band (oob) execution" changed how we check "id": Note that in the patch I exported qmp_dispatch_check_obj() to be used to check the request earlier, and at the same time allowed "id" field to be there since actually we always allow that. The part after "and" is ill-advised: it makes qemu-ga accept and ignore "id". Revert. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-10-armbru@redhat.com>
2018-07-03tests/test-qga: Demonstrate the guest-agent ignores "id"Markus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-9-armbru@redhat.com>
2018-07-03qmp: Make "id" optional again even in "oob" monitorsMarkus Armbruster
Commit cf869d53172 "qmp: support out-of-band (oob) execution" made "id" mandatory for all commands when the client accepted capability "oob". This is rather onerous when you play with QMP by hand, and unnecessarily so: only out-of-band commands need an ID for reliable matching of response to command. Revert that part of commit cf869d53172 for now, but have documentation advise on the need to use "id" with out-of-band commands. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180703085358.13941-8-armbru@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2018-07-03tests/qmp-test: Test in-band command doesn't overtakeMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-7-armbru@redhat.com>
2018-07-03qmp: Get rid of x-oob-test commandMarkus Armbruster
tests/qmp-test tests an out-of-band command overtaking a slow in-band command. To do that, it needs: 1. An in-band command that *reliably* takes long enough to be overtaken. 2. An out-of-band command to do the overtaking. 3. To avoid delays, a way to make the in-band command complete quickly after it was overtaken. To satisfy these needs, commit 469638f9cb3 provides the rather peculiar oob-capable QMP command x-oob-test: * With "lock": true, it waits for a global semaphore. * With "lock": false, it signals the global semaphore. To satisfy 1., the test runs x-oob-test in-band with "lock": true. To satisfy 2. and 3., it runs x-oob-test out-of-band with "lock": false. Note that waiting for a semaphore violates the rules for oob-capable commands. Running x-oob-test with "lock": true hangs the monitor until you run x-oob-test with "lock": false on another monitor (which you might not have set up). Having an externally visible QMP command that may hang the monitor is not nice. Let's apply a little more ingenuity to the problem. Idea: have an existing command block on reading a FIFO special file, unblock it by opening the FIFO for writing. For 1., use {"execute": "blockdev-add", "id": ID1, "arguments": { "driver": "blkdebug", "node-name": ID1, "config": FIFO, "image": { "driver": "null-co"}}} where ID1 is an arbitrary string, and FIFO is the name of the FIFO. For 2., use {"execute": "migrate-pause", "id": ID2, "control": {"run-oob": true}} where ID2 is a different arbitrary string. Since there's no migration to pause, the command will fail, but that's fine; instant failure is still a test of out-of-band responses overtaking in-band commands. For 3., open FIFO for writing. Drop QMP command x-oob-test. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-6-armbru@redhat.com> [Error checking tweaked]
2018-07-03qmp: Document COMMAND_DROPPED design flawMarkus Armbruster
Events are broadcast to all monitors. If another monitor's client has a command with the same ID in flight, the event will incorrectly claim that command was dropped. This must be fixed before out-of-band execution can graduate from "experimental". Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-5-armbru@redhat.com>
2018-07-03docs/interop/qmp: Improve OOB documentationMarkus Armbruster
OOB documentation is spread over qmp-spec.txt sections 2.2.1 Capabilities and 2.3 Issuing Commands. The amount of detail is a bit distracting there. Move the meat of the matter to new section 2.3.1 Out of band execution. Throw in a few other improvements while there: * 2.2 Server Greeting: Drop advice to search entire capabilities array; should be obvious. * 3. QMP Examples - 3.1 Server Greeting: Update greeting to the one we expect for the release. Now shows capability "oob". Update qmp-intro.txt likewise. - 3.2 Capabilities negotiation: Show client accepting capability "oob". - 3.7 Out-of-band execution: New. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-4-armbru@redhat.com> [Whitespace tidied up]
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