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2018-11-06monitor: delay monitor iothread creationWolfgang Bumiller
Commit d32749deb615 moved the call to monitor_init_globals() to before os_daemonize(), making it an unsuitable place to spawn the monitor iothread as it won't be inherited over the fork() in os_daemonize(). We now spawn the thread the first time we instantiate a monitor which actually has use_io_thread == true. Instantiation of monitors happens only after os_daemonize(). We still need to create the qmp_dispatcher_bh when not using iothreads, so this now still happens in monitor_init_globals(). Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Fixes: d32749deb615 ("monitor: move init global earlier") Message-Id: <20180925081507.11873-3-w.bumiller@proxmox.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Tested-by: Peter Xu <peterx@redhat.com> [This fixes a crash on shutdown with --daemonize] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-11-06monitor: guard iothread access by mon->use_io_threadWolfgang Bumiller
monitor_resume() and monitor_suspend() both want to "kick" the I/O thread if it is there, but in monitor_suspend() lacked the use_io_thread flag condition. This is required when we later only spawn the thread on first use. Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Message-Id: <20180925081507.11873-2-w.bumiller@proxmox.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-10-18tcg: distribute tcg_time into TCG contextsEmilio G. Cota
When we implemented per-vCPU TCG contexts, we forgot to also distribute the tcg_time counter, which has remained as a global accessed without any serialization, leading to potentially missed counts. Fix it by distributing the field over the TCG contexts, embedding it into TCGProfile with a field called "cpu_exec_time", which is more descriptive than "tcg_time". Add a function to query this value directly, and for completeness, fill in the field in tcg_profile_snapshot, even though its callers do not use it. Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <20181010144853.13005-5-cota@braap.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2018-10-05qdev-monitor: print help to stdoutMarc-André Lureau
qdev_device_help() is used from command line "-device help", or from HMP "device_add". If used from command line, print help to stdout (it is only printed on explicit demand). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2018-09-25monitor: print message when using 'help' with an unknown commandCollin Walling
When typing 'help' followed by an unknown command, QEMU will not print anything to the command line to let the user know they typed a bad command. Let's fix this by printing a message to the monitor when this happens. For example: (qemu) help xyz unknown command: 'xyz' Reported-by: Stefan Zimmermann <stzi@linux.ibm.com> Signed-off-by: Collin Walling <walling@linux.ibm.com> Message-Id: <1532115624-27568-1-git-send-email-walling@linux.ibm.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2018-09-24Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2018-09-01' ↵Peter Maydell
into staging Monitor patches for 2018-09-01 # gpg: Signature made Sat 01 Sep 2018 12:06:52 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-2018-09-01: monitor: no need to save need_resume Revert "qmp: isolate responses into io thread" qmp: constify qmp_is_oob() monitor: consitify qmp_send_response() QDict argument monitor: accept input on resume monitor: simplify monitor_qmp_setup_handlers_bh Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-08-30monitor: no need to save need_resumeMarc-André Lureau
There is no need for per-command need_resume granularity, it should resume after running an non-oob command on oob-disabled monitor. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180829134043.31706-5-marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-30Revert "qmp: isolate responses into io thread"Marc-André Lureau
This reverts commit abe3cd0ff7f774966da6842620806ab7576fe4f3. There is no need to add an additional queue to send the reply to the IOThread, because QMP response is thread safe, and chardev write path is thread safe. It will schedule the watcher in the associated IOThread. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180829134043.31706-4-marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-30monitor: consitify qmp_send_response() QDict argumentMarc-André Lureau
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180829134043.31706-2-marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-28monitor: accept input on resumeMarc-André Lureau
A chardev may stop trying to write if the associated can_read() callback returned 0. This happens when the monitor is suspended. The frontend is supposed to call qemu_chr_fe_accept_input() when it is ready to accept data again. An issue was observed with a spice port: pending commands may be delayed, as the chardev is not flushed. Most chardev don't use the accept_input() callback, and instead check regularly if they can write. The ones that do use it are braille, mux, msmouse, spice (abstract), spicevmc, spiceport, wctablet. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180817173752.19136-1-marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-28qapi: Drop qapi_event_send_FOO()'s Error ** argumentPeter Xu
The generated qapi_event_send_FOO() take an Error ** argument. They can't actually fail, because all they do with the argument is passing it to functions that can't fail: the QObject output visitor, and the @qmp_emit callback, which is either monitor_qapi_event_queue() or event_test_emit(). Drop the argument, and pass &error_abort to the QObject output visitor and @qmp_emit instead. Suggested-by: Eric Blake <eblake@redhat.com> Suggested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180815133747.25032-4-peterx@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Commit message rewritten, update to qapi-code-gen.txt corrected] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-28monitor: simplify monitor_qmp_setup_handlers_bhPeter Xu
When we reach monitor_qmp_setup_handlers_bh() we must be using the IOThread then, so no need to check against it any more. Instead, we assert. Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180815133747.25032-2-peterx@redhat.com> [Insufficiently useful comment dropped] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-08-24json: Clean up headersMarkus Armbruster
The JSON parser has three public headers, json-lexer.h, json-parser.h, json-streamer.h. They all contain stuff that is of no interest outside qobject/json-*.c. Collect the public interface in include/qapi/qmp/json-parser.h, and everything else in qobject/json-parser-int.h. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-54-armbru@redhat.com>
2018-08-24json: Pass lexical errors and limit violations to callbackMarkus Armbruster
The callback to consume JSON values takes QObject *json, Error *err. If both are null, the callback is supposed to make up an error by itself. This sucks. qjson.c's consume_json() neglects to do so, which makes qobject_from_json() null instead of failing. I consider that a bug. The culprit is json_message_process_token(): it passes two null pointers when it runs into a lexical error or a limit violation. Fix it to pass a proper Error object then. Update the callbacks: * monitor.c's handle_qmp_command(): the code to make up an error is now dead, drop it. * qga/main.c's process_event(): lumps the "both null" case together with the "not a JSON object" case. The former is now gone. The error message "Invalid JSON syntax" is misleading for the latter. Improve it to "Input must be a JSON object". * qobject/qjson.c's consume_json(): no update; check-qjson demonstrates qobject_from_json() now sets an error on lexical errors, but still doesn't on some other errors. * tests/libqtest.c's qmp_response(): the Error object is now reliable, so use it to improve the error message. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-40-armbru@redhat.com>
2018-08-24json: Redesign the callback to consume JSON valuesMarkus Armbruster
The classical way to structure parser and lexer is to have the client call the parser to get an abstract syntax tree, the parser call the lexer to get the next token, and the lexer call some function to get input characters. Another way to structure them would be to have the client feed characters to the lexer, the lexer feed tokens to the parser, and the parser feed abstract syntax trees to some callback provided by the client. This way is more easily integrated into an event loop that dispatches input characters as they arrive. Our JSON parser is kind of between the two. The lexer feeds tokens to a "streamer" instead of a real parser. The streamer accumulates tokens until it got the sequence of tokens that comprise a single JSON value (it counts curly braces and square brackets to decide). It feeds those token sequences to a callback provided by the client. The callback passes each token sequence to the parser, and gets back an abstract syntax tree. I figure it was done that way to make a straightforward recursive descent parser possible. "Get next token" becomes "pop the first token off the token sequence". Drawback: we need to store a complete token sequence. Each token eats 13 + input characters + malloc overhead bytes. Observations: 1. This is not the only way to use recursive descent. If we replaced "get next token" by a coroutine yield, we could do without a streamer. 2. The lexer reports errors by passing a JSON_ERROR token to the streamer. This communicates the offending input characters and their location, but no more. 3. The streamer reports errors by passing a null token sequence to the callback. The (already poor) lexical error information is thrown away. 4. Having the callback receive a token sequence duplicates the code to convert token sequence to abstract syntax tree in every callback. 5. Known bug: the streamer silently drops incomplete token sequences. This commit rectifies 4. by lifting the call of the parser from the callbacks into the streamer. Later commits will address 3. and 5. The lifting removes a bug from qjson.c's parse_json(): it passed a pointer to a non-null Error * in certain cases, as demonstrated by check-qjson.c. json_parser_parse() is now unused. It's a stupid wrapper around json_parser_parse_err(). Drop it, and rename json_parser_parse_err() to json_parser_parse(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-35-armbru@redhat.com>
2018-08-23hmp-commands-info: add sync-profileEmilio G. Cota
The command introduced here is just for developers. This means that: - the info displayed and the output format could change in the future - the command is only meant to be used from HMP, not from QMP Sample output: (qemu) sync-profile sync-profile is off (qemu) info sync-profile Type Object Call site Wait Time (s) Count Average (us) ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- (qemu) sync-profile on (qemu) sync-profile sync-profile is on (qemu) info sync-profile 15 Type Object Call site Wait Time (s) Count Average (us) ---------------------------------------------------------------------------------------------- condvar 0x55a01813ced0 cpus.c:1165 91.38235 2842 32154.24 BQL mutex 0x55a0171b7140 cpus.c:1434 12.56490 5787 2171.23 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:432 7.75846 2844 2728.01 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:870 5.09889 2884 1767.99 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:529 3.46140 3254 1063.74 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:804 0.76333 8655 88.20 BQL mutex 0x55a0171b7140 cpus.c:1466 0.60893 2941 207.05 BQL mutex 0x55a0171b7140 util/main-loop.c:236 0.00894 6425 1.39 mutex [ 3] util/qemu-timer.c:520 0.00342 50611 0.07 mutex [ 2] util/qemu-timer.c:426 0.00254 31336 0.08 mutex [ 3] util/qemu-timer.c:234 0.00107 19275 0.06 mutex 0x55a0171d9960 vl.c:763 0.00043 6425 0.07 mutex 0x55a0180d1bb0 monitor.c:458 0.00015 1603 0.09 mutex 0x55a0180e4c78 chardev/char.c:109 0.00002 217 0.08 mutex 0x55a0180d1bb0 monitor.c:448 0.00001 162 0.08 ---------------------------------------------------------------------------------------------- (qemu) info sync-profile -m 15 Type Object Call site Wait Time (s) Count Average (us) ---------------------------------------------------------------------------------------------- condvar 0x55a01813ced0 cpus.c:1165 95.11196 3051 31174.03 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:432 7.92108 3052 2595.37 BQL mutex 0x55a0171b7140 cpus.c:1434 13.38253 6210 2155.00 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:870 5.09901 3093 1648.57 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:529 4.21123 3468 1214.31 BQL mutex 0x55a0171b7140 cpus.c:1466 0.60895 3156 192.95 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:804 0.76337 9282 82.24 BQL mutex 0x55a0171b7140 util/main-loop.c:236 0.00944 6889 1.37 mutex 0x55a01813ce80 tcg/tcg.c:397 0.00000 24 0.15 mutex 0x55a0180d1bb0 monitor.c:458 0.00018 1922 0.09 mutex [ 2] util/qemu-timer.c:426 0.00266 32710 0.08 mutex 0x55a0180e4c78 chardev/char.c:109 0.00002 260 0.08 mutex 0x55a0180d1bb0 monitor.c:448 0.00001 187 0.08 mutex 0x55a0171d9960 vl.c:763 0.00047 6889 0.07 mutex [ 3] util/qemu-timer.c:520 0.00362 53377 0.07 ---------------------------------------------------------------------------------------------- (qemu) info sync-profile -m -n 15 Type Object Call site Wait Time (s) Count Average (us) ---------------------------------------------------------------------------------------------- condvar 0x55a01813ced0 cpus.c:1165 101.39331 3398 29839.12 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:432 7.92112 3399 2330.43 BQL mutex 0x55a0171b7140 cpus.c:1434 14.28280 6922 2063.39 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:870 5.77505 3445 1676.36 BQL mutex 0x55a0171b7140 accel/tcg/cpu-exec.c:529 5.66139 3883 1457.99 BQL mutex 0x55a0171b7140 cpus.c:1466 0.60901 3519 173.06 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:804 0.76351 10338 73.85 BQL mutex 0x55a0171b7140 util/main-loop.c:236 0.01032 7664 1.35 mutex 0x55a0180e4f08 util/qemu-timer.c:426 0.00041 901 0.45 mutex 0x55a01813ce80 tcg/tcg.c:397 0.00000 24 0.15 mutex 0x55a0180d1bb0 monitor.c:458 0.00022 2319 0.09 mutex 0x55a0180e4c78 chardev/char.c:109 0.00003 306 0.08 mutex 0x55a0180e4f08 util/qemu-timer.c:520 0.00068 8565 0.08 mutex 0x55a0180d1bb0 monitor.c:448 0.00002 215 0.08 mutex 0x55a0180e4f78 util/qemu-timer.c:426 0.00247 34224 0.07 ---------------------------------------------------------------------------------------------- (qemu) sync-profile reset (qemu) info sync-profile -m 2 Type Object Call site Wait Time (s) Count Average (us) -------------------------------------------------------------------------------------------- condvar 0x55a01813ced0 cpus.c:1165 2.78756 99 28157.12 BQL mutex 0x55a0171b7140 accel/tcg/cputlb.c:870 0.33054 102 3240.55 -------------------------------------------------------------------------------------------- (qemu) sync-profile off (qemu) sync-profile sync-profile is off (qemu) sync-profile reset (qemu) info sync-profile Type Object Call site Wait Time (s) Count Average (us) ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-08-15monitor: fix oob command leakMarc-André Lureau
Spotted by ASAN, during make check... Direct leak of 40 byte(s) in 1 object(s) allocated from: #0 0x7f8e27262c48 in malloc (/lib64/libasan.so.5+0xeec48) #1 0x7f8e26a5f3c5 in g_malloc (/lib64/libglib-2.0.so.0+0x523c5) #2 0x555ab67078a8 in qstring_from_str /home/elmarco/src/qq/qobject/qstring.c:67 #3 0x555ab67071e4 in qstring_new /home/elmarco/src/qq/qobject/qstring.c:24 #4 0x555ab6713fbf in qstring_from_escaped_str /home/elmarco/src/qq/qobject/json-parser.c:144 #5 0x555ab671738c in parse_literal /home/elmarco/src/qq/qobject/json-parser.c:506 #6 0x555ab67179c3 in parse_value /home/elmarco/src/qq/qobject/json-parser.c:569 #7 0x555ab6715123 in parse_pair /home/elmarco/src/qq/qobject/json-parser.c:306 #8 0x555ab6715483 in parse_object /home/elmarco/src/qq/qobject/json-parser.c:357 #9 0x555ab671798b in parse_value /home/elmarco/src/qq/qobject/json-parser.c:561 #10 0x555ab6717a6b in json_parser_parse_err /home/elmarco/src/qq/qobject/json-parser.c:592 #11 0x555ab4fd4dcf in handle_qmp_command /home/elmarco/src/qq/monitor.c:4257 #12 0x555ab6712c4d in json_message_process_token /home/elmarco/src/qq/qobject/json-streamer.c:105 #13 0x555ab67e01e2 in json_lexer_feed_char /home/elmarco/src/qq/qobject/json-lexer.c:323 #14 0x555ab67e0af6 in json_lexer_feed /home/elmarco/src/qq/qobject/json-lexer.c:373 #15 0x555ab6713010 in json_message_parser_feed /home/elmarco/src/qq/qobject/json-streamer.c:124 #16 0x555ab4fd58ec in monitor_qmp_read /home/elmarco/src/qq/monitor.c:4337 #17 0x555ab6559df2 in qemu_chr_be_write_impl /home/elmarco/src/qq/chardev/char.c:175 #18 0x555ab6559e95 in qemu_chr_be_write /home/elmarco/src/qq/chardev/char.c:187 #19 0x555ab6560127 in fd_chr_read /home/elmarco/src/qq/chardev/char-fd.c:66 #20 0x555ab65d9c73 in qio_channel_fd_source_dispatch /home/elmarco/src/qq/io/channel-watch.c:84 #21 0x7f8e26a598ac in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x4c8ac) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180809114417.28718-4-marcandre.lureau@redhat.com> [Screwed up in commit b27314567d4] Cc: qemu-stable@nongnu.org Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-07-31monitor: temporary fix for dead-lock on event recursionMarc-André Lureau
With a Spice port chardev, it is possible to reenter monitor_qapi_event_queue() (when the client disconnects for example). This will dead-lock on monitor_lock. Instead, use some TLS variables to check for recursion and queue the events. Fixes: (gdb) bt #0 0x00007fa69e7217fd in __lll_lock_wait () at /lib64/libpthread.so.0 #1 0x00007fa69e71acf4 in pthread_mutex_lock () at /lib64/libpthread.so.0 #2 0x0000563303567619 in qemu_mutex_lock_impl (mutex=0x563303d3e220 <monitor_lock>, file=0x5633036589a8 "/home/elmarco/src/qq/monitor.c", line=645) at /home/elmarco/src/qq/util/qemu-thread-posix.c:66 #3 0x0000563302fa6c25 in monitor_qapi_event_queue (event=QAPI_EVENT_SPICE_DISCONNECTED, qdict=0x56330602bde0, errp=0x7ffc6ab5e728) at /home/elmarco/src/qq/monitor.c:645 #4 0x0000563303549aca in qapi_event_send_spice_disconnected (server=0x563305afd630, client=0x563305745360, errp=0x563303d8d0f0 <error_abort>) at qapi/qapi-events-ui.c:149 #5 0x00005633033e600f in channel_event (event=3, info=0x5633061b0050) at /home/elmarco/src/qq/ui/spice-core.c:235 #6 0x00007fa69f6c86bb in reds_handle_channel_event (reds=<optimized out>, event=3, info=0x5633061b0050) at reds.c:316 #7 0x00007fa69f6b193b in main_dispatcher_self_handle_channel_event (info=0x5633061b0050, event=3, self=0x563304e088c0) at main-dispatcher.c:197 #8 0x00007fa69f6b193b in main_dispatcher_channel_event (self=0x563304e088c0, event=event@entry=3, info=0x5633061b0050) at main-dispatcher.c:197 #9 0x00007fa69f6d0833 in red_stream_push_channel_event (s=s@entry=0x563305ad8f50, event=event@entry=3) at red-stream.c:414 #10 0x00007fa69f6d086b in red_stream_free (s=0x563305ad8f50) at red-stream.c:388 #11 0x00007fa69f6b7ddc in red_channel_client_finalize (object=0x563304df2360) at red-channel-client.c:347 #12 0x00007fa6a56b7fb9 in g_object_unref () at /lib64/libgobject-2.0.so.0 #13 0x00007fa69f6ba212 in red_channel_client_push (rcc=0x563304df2360) at red-channel-client.c:1341 #14 0x00007fa69f68b259 in red_char_device_send_msg_to_client (client=<optimized out>, msg=0x5633059b6310, dev=0x563304e08bc0) at char-device.c:305 #15 0x00007fa69f68b259 in red_char_device_send_msg_to_clients (msg=0x5633059b6310, dev=0x563304e08bc0) at char-device.c:305 #16 0x00007fa69f68b259 in red_char_device_read_from_device (dev=0x563304e08bc0) at char-device.c:353 #17 0x000056330317d01d in spice_chr_write (chr=0x563304cafe20, buf=0x563304cc50b0 "{\"timestamp\": {\"seconds\": 1532944763, \"microseconds\": 326636}, \"event\": \"SHUTDOWN\", \"data\": {\"guest\": false}}\r\n", len=111) at /home/elmarco/src/qq/chardev/spice.c:199 #18 0x00005633034deee7 in qemu_chr_write_buffer (s=0x563304cafe20, buf=0x563304cc50b0 "{\"timestamp\": {\"seconds\": 1532944763, \"microseconds\": 326636}, \"event\": \"SHUTDOWN\", \"data\": {\"guest\": false}}\r\n", len=111, offset=0x7ffc6ab5ea70, write_all=false) at /home/elmarco/src/qq/chardev/char.c:112 #19 0x00005633034df054 in qemu_chr_write (s=0x563304cafe20, buf=0x563304cc50b0 "{\"timestamp\": {\"seconds\": 1532944763, \"microseconds\": 326636}, \"event\": \"SHUTDOWN\", \"data\": {\"guest\": false}}\r\n", len=111, write_all=false) at /home/elmarco/src/qq/chardev/char.c:147 #20 0x00005633034e1e13 in qemu_chr_fe_write (be=0x563304dbb800, buf=0x563304cc50b0 "{\"timestamp\": {\"seconds\": 1532944763, \"microseconds\": 326636}, \"event\": \"SHUTDOWN\", \"data\": {\"guest\": false}}\r\n", len=111) at /home/elmarco/src/qq/chardev/char-fe.c:42 #21 0x0000563302fa6334 in monitor_flush_locked (mon=0x563304dbb800) at /home/elmarco/src/qq/monitor.c:425 #22 0x0000563302fa6520 in monitor_puts (mon=0x563304dbb800, str=0x563305de7e9e "") at /home/elmarco/src/qq/monitor.c:468 #23 0x0000563302fa680c in qmp_send_response (mon=0x563304dbb800, rsp=0x563304df5730) at /home/elmarco/src/qq/monitor.c:517 #24 0x0000563302fa6905 in qmp_queue_response (mon=0x563304dbb800, rsp=0x563304df5730) at /home/elmarco/src/qq/monitor.c:538 #25 0x0000563302fa6b5b in monitor_qapi_event_emit (event=QAPI_EVENT_SHUTDOWN, qdict=0x563304df5730) at /home/elmarco/src/qq/monitor.c:624 #26 0x0000563302fa6c4b in monitor_qapi_event_queue (event=QAPI_EVENT_SHUTDOWN, qdict=0x563304df5730, errp=0x7ffc6ab5ed00) at /home/elmarco/src/qq/monitor.c:649 #27 0x0000563303548cce in qapi_event_send_shutdown (guest=false, errp=0x563303d8d0f0 <error_abort>) at qapi/qapi-events-run-state.c:58 #28 0x000056330313bcd7 in main_loop_should_exit () at /home/elmarco/src/qq/vl.c:1822 #29 0x000056330313bde3 in main_loop () at /home/elmarco/src/qq/vl.c:1862 #30 0x0000563303143781 in main (argc=3, argv=0x7ffc6ab5f068, envp=0x7ffc6ab5f088) at /home/elmarco/src/qq/vl.c:4644 Note that error report is now moved to the first caller, which may receive an error for a recursed event. This is probably fine (95% of callers use &error_abort, the rest have NULL error and ignore it) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180731150144.14022-1-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [*_no_recurse renamed to *_no_reenter, local variables reordered] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-07-23monitor: Fix unsafe sharing of @cur_mon among threadsPeter Xu
@cur_mon is null unless the main thread is running monitor code, either HMP code within monitor_read(), or QMP code within monitor_qmp_dispatch(). Use of @cur_mon outside the main thread is therefore unsafe. Most of its uses are in monitor command handlers. These run in the main thread. However, there are also uses hiding elsewhere, such as in error_vprintf(), and thus error_report(), making these functions unsafe outside the main thread. No such unsafe uses are known at this time. Regardless, this is an unnecessary trap. It's an ancient trap, though. More recently, commit cf869d53172 "qmp: support out-of-band (oob) execution" spiced things up: the monitor I/O thread assigns to @cur_mon when executing commands out-of-band. Having two threads save, set and restore @cur_mon without synchronization is definitely unsafe. We can end up with @cur_mon null while the main thread runs monitor code, or non-null while it runs non-monitor code. We could fix this by making the I/O thread not mess with @cur_mon, but that would leave the trap armed and ready. Instead, make @cur_mon thread-local. It's now reliably null unless the thread is running monitor code. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> [peterx: update subject and commit message written by Markus] Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180720033451.32710-1-peterx@redhat.com>
2018-07-16monitor: Fix tracepoint crash on JSON syntax errorMarkus Armbruster
When tracepoint handle_qmp_command is enabled, we crash on JSON syntax errors. Broken in commit 1cc37471525. Fix by skipping the tracepoint on JSON syntax error. Before the flawed commit, we skipped it by returning early. Fixes: CID 1394216 Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180716091012.29510-1-armbru@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com>
2018-07-11monitor: fix double-free of request errorMarc-André Lureau
qmp_error_response() will free the given error. Fix double-free in later qmp_request_free(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180705164201.9853-1-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Fixes: 1cc37471525d03f963bc71d724f0dc9eab888fc1 Signed-off-by: Markus Armbruster <armbru@redhat.com>
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>
2018-07-03monitor: 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>
2018-07-03qmp: 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>
2018-07-03monitor: 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>
2018-07-03qmp 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>
2018-07-03qmp: 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>
2018-07-03qmp: 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>
2018-07-03qapi: add conditions to SPICE type/commands/events on the schemaMarc-André Lureau
Add #if defined(CONFIG_SPICE) in generated code, and adjust the qmp/hmp code accordingly. query-qmp-schema no longer reports the command/events etc as available when disabled at compile time. Commands made conditional: * query-spice Before the patch, the command for !CONFIG_SPICE is unregistered. It will fail with the same error. Events made conditional: * SPICE_CONNECTED, SPICE_INITIALIZED, SPICE_DISCONNECTED, SPICE_MIGRATE_COMPLETED Add TODO for conditional SPICE chardevs, delayed until the supports for conditional members lands. No HMP change, the code was already conditional. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180703155648.11933-15-marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-07-03monitor: Spell "I/O thread" consistently in commentsMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-3-armbru@redhat.com>
2018-07-03qmp: Say "out-of-band" instead of "Out-Of-Band"Markus Armbruster
Affects documentation and a few error messages. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180703085358.13941-2-armbru@redhat.com>
2018-07-02monitor: Use the IEC binary prefix definitionsPhilippe Mathieu-Daudé
It eases code review, unit is explicit. Patch generated using: $ git grep -n '[<>][<>]= ?[1-5]0' and modified manually. Suggested-by: Eric Blake <eblake@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180625124238.25339-43-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-06-30monitor: flush qmp responses when CLOSEDPeter Xu
Previously we clean up the queues when we got CLOSED event. It was used to make sure we won't send leftover replies/events of a old client to a new client which makes perfect sense. However this will also drop the replies/events even if the output port of the previous chardev backend is still open, which can lead to missing of the last replies/events. Now this patch does an extra operation to flush the response queue before cleaning up. In most cases, a QMP session will be based on a bidirectional channel (a TCP port, for example, we read/write to the same socket handle), so in port and out port of the backend chardev are fundamentally the same port. In these cases, it does not really matter much on whether we'll flush the response queue since flushing will fail anyway. However there can be cases where in & out ports of the QMP monitor's backend chardev are separated. Here is an example: cat $QMP_COMMANDS | qemu -qmp stdio ... | filter_commands In this case, the backend is fd-typed, and it is connected to stdio where in port is stdin and out port is stdout. Now if we drop all the events on the response queue then filter_command process might miss some events that it might expect. The thing is that, when stdin closes, stdout might still be there alive! In practice, I encountered SHUTDOWN event missing when running test with iotest 087 with Out-Of-Band enabled. Here is one of the ways that this can happen (after "quit" command is executed and QEMU quits the main loop): 1. [main thread] QEMU queues a SHUTDOWN event into response queue. 2. "cat" terminates (to distinguish it from the animal, I quote it). 3. [monitor iothread] QEMU's monitor iothread reads EOF from stdin. 4. [monitor iothread] QEMU's monitor iothread calls the CLOSED event hook for the monitor, which will destroy the response queue of the monitor, then the SHUTDOWN event is dropped. 5. [main thread] QEMU's main thread cleans up the monitors in monitor_cleanup(). When trying to flush pending responses, it sees nothing. SHUTDOWN is lost forever. Note that before the monitor iothread was introduced, step [4]/[5] could never happen since the main loop was the only place to detect the EOF event of stdin and run the CLOSED event hooks. Now things can happen in parallel in the iothread. Without this patch, iotest 087 will have ~10% chance to miss the SHUTDOWN event and fail when with Out-Of-Band enabled: --- /home/peterx/git/qemu/tests/qemu-iotests/087.out +++ /home/peterx/git/qemu/bin/tests/qemu-iotests/087.out.bad @@ -8,7 +8,6 @@ {"return": {}} {"error": {"class": "GenericError", "desc": "'node-name' must be specified for the root node"}} {"return": {}} -{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}} === Duplicate ID === @@ -53,7 +52,6 @@ {"return": {}} {"return": {}} {"return": {}} -{"timestamp": {"seconds": TIMESTAMP, "microseconds": TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false}} This patch fixes the problem. Fixes: 6d2d563f8c ("qmp: cleanup qmp queues properly", 2018-03-27) Suggested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180620073223.31964-4-peterx@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Commit message and a comment touched up] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-06-30monitor: rename *_pop_one to *_pop_anyPeter Xu
The old names are confusing since both of the old functions are popping an item from multiple queues rather than a single queue. In that sense, *_pop_any() suites better than *_pop_one(). Since at it, touch up the function monitor_qmp_response_pop_any() a bit to let the callers pass in a QMPResponse struct instead of returning a struct. Change the return value to boolean to mark whether we have popped a valid response instead. Suggested-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180620073223.31964-3-peterx@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-06-29Merge remote-tracking branch 'remotes/gkurz/tags/for-upstream' into stagingPeter Maydell
The Darwin host support still needs some more work. It won't make it for soft-freeze, but I'd like these preparatory patches to be merged anyway. # gpg: Signature made Fri 29 Jun 2018 11:39:04 BST # gpg: using RSA key 71D4D5E5822F73D6 # gpg: Good signature from "Greg Kurz <groug@kaod.org>" # gpg: aka "Gregory Kurz <gregory.kurz@free.fr>" # gpg: aka "[jpeg image of size 3330]" # Primary key fingerprint: B482 8BAF 9431 40CE F2A3 4910 71D4 D5E5 822F 73D6 * remotes/gkurz/tags/for-upstream: 9p: darwin: Explicitly cast comparisons of mode_t with -1 cutils: Provide strchrnul Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-06-29cutils: Provide strchrnulKeno Fischer
strchrnul is a GNU extension and thus unavailable on a number of targets. In the review for a commit removing strchrnul from 9p, I was asked to create a qemu_strchrnul helper to factor out this functionality. Do so, and use it in a number of other places in the code base that inlined the replacement pattern in a place where strchrnul could be used. Signed-off-by: Keno Fischer <keno@juliacomputing.com> Acked-by: Greg Kurz <groug@kaod.org> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Greg Kurz <groug@kaod.org>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 10:55:08 +0000