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* vhost-user: fix watcher need be removed when vhost-user hotplugYunjian Wang2017-08-011-0/+4
| | | | | | | | | | | | | | | | | | | | | "nc" is freed after hotplug vhost-user, but the watcher is not removed. The QEMU crash when the watcher access the "nc" when socket disconnects. Program received signal SIGSEGV, Segmentation fault. #0 object_get_class (obj=obj@entry=0x2) at qom/object.c:750 #1 0x00007f9bb4180da1 in qemu_chr_fe_disconnect (be=<optimized out>) at chardev/char-fe.c:372 #2 0x00007f9bb40d1100 in net_vhost_user_watch (chan=<optimized out>, cond=<optimized out>, opaque=<optimized out>) at net/vhost-user.c:188 #3 0x00007f9baf97f99a in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #4 0x00007f9bb41d7ebc in glib_pollfds_poll () at util/main-loop.c:213 #5 os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:261 #6 main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:515 #7 0x00007f9bb3e266a7 in main_loop () at vl.c:1917 #8 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4786 Signed-off-by: Yunjian Wang <wangyunjian@huawei.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* char: add backend hotswap handlerAnton Nefedov2017-07-141-3/+4
| | | | | | | | | | | Frontends should have an interface to setup the handler of a backend change. The interface will be used in the next commits Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1499342940-56739-3-git-send-email-anton.nefedov@virtuozzo.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: make chr_fe_deinit() optionaly delete backendMarc-André Lureau2017-06-021-4/+1Star
| | | | | | | | | | | This simplifies removing a backend for a frontend user (no need to retrieve the associated driver and separate delete call etc). NB: many frontends have questionable handling of ending a chardev. They should probably delete the backend to prevent broken reusage. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
* char: move CharBackend handling in char-fe unitMarc-André Lureau2017-06-021-1/+1
| | | | | | | | | | | | | | Move all the frontend struct and methods to a seperate unit. This avoids accidentally mixing backend and frontend calls, and helps with readabilty. Make qemu_chr_replay() a macro shared by both char and char-fe. Export qemu_chr_write(), and use a macro for qemu_chr_write_all() (nb: yes, CharBackend is for char frontend :) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
* chardev: move headers to include/chardevMarc-André Lureau2017-06-021-1/+1
| | | | | | | | So they are all in one place. The following patch will move serial & parallel declarations to the respective headers. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
* char: add a /chardevs containerMarc-André Lureau2017-05-041-1/+1
| | | | | | | Add a /chardevs container object to hold the list of chardevs. (Note: QTAILQ chardevs is going away in the following commits) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
* vhost-user: delay vhost_user_stopMarc-André Lureau2017-02-281-7/+46
| | | | | | | | | | | | Since commit b0a335e351103bf92f3f9d0bd5759311be8156ac, a socket write may trigger a disconnect events, calling vhost_user_stop() and clearing all the vhost_dev strutures holding data that vhost.c functions expect to remain valid. Delay the cleanup to keep the vhost_dev structure valid during the vhost.c functions. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-id: 20170227104956.24729-1-marcandre.lureau@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
* vhost-user: delete chardev on cleanupMarc-André Lureau2017-02-011-0/+3
| | | | | | | | | | | | | Remove the chardev implicitly when cleaning up the netdev. This prevents from reusing the chardev since it would be in an incorrect state with the slave. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1256618 Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: rename CharDriverState ChardevMarc-André Lureau2017-01-271-5/+5
| | | | | | | | Pick a uniform chardev type name. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: remove explicit_fe_open, use a set_handlers argumentMarc-André Lureau2016-10-241-1/+1
| | | | | | | | | No need to keep explicit_fe_open around if it affects only a qemu_chr_fe_set_handlers(). Use an additional argument instead. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-24-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: replace qemu_chr_claim/release with qemu_chr_fe_init/deinitMarc-André Lureau2016-10-241-6/+2Star
| | | | | | | | | | | | | | | Now that all front end use qemu_chr_fe_init(), we can move chardev claiming in init(), and add a function deinit() to release the chardev and cleanup handlers. The qemu_chr_fe_claim_no_fail() for property are gone, since the property will raise an error instead. In other cases, where there is already an error path, an error is raised instead. Finally, other cases are handled by &error_abort in qemu_chr_fe_init(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-19-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* vhost-user: only initialize queue 0 CharBackendMarc-André Lureau2016-10-241-16/+13Star
| | | | | | | | | | All the queues share the same chardev. Initialize only the first queue CharBackend, and pass it to other queues. This will allow to claim the chardev only once in a later change. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-18-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: use qemu_chr_fe* functions with CharBackend argumentMarc-André Lureau2016-10-241-9/+12
| | | | | | | | | | | This also switches from qemu_chr_add_handlers() to qemu_chr_fe_set_handlers(). Note that qemu_chr_fe_set_handlers() now takes the focus when fe_open (qemu_chr_add_handlers() did take the focus) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-16-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: rename some frontend functionsMarc-André Lureau2016-10-241-2/+2
| | | | | | | | | qemu_chr_accept_input() and qemu_chr_disconnect() are only used by frontend, so use qemu_chr_fe prefix. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-14-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: remaining switch to CharBackend in frontendMarc-André Lureau2016-10-241-12/+15
| | | | | | | | | Similar to previous change, for the remaining CharDriverState front ends users. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20161022095318.17775-13-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* net: don't poke at chardev internal QemuOptsDaniel P. Berrange2016-10-101-34/+7Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The vhost-user & colo code is poking at the QemuOpts instance in the CharDriverState struct, not realizing that it is valid for this to be NULL. e.g. the following crash shows a codepath where it will be NULL: Program terminated with signal SIGSEGV, Segmentation fault. #0 0x000055baf6ab4adc in qemu_opt_foreach (opts=0x0, func=0x55baf696b650 <net_vhost_chardev_opts>, opaque=0x7ffc51368c00, errp=0x7ffc51368e48) at util/qemu-option.c:617 617 QTAILQ_FOREACH(opt, &opts->head, next) { [Current thread is 1 (Thread 0x7f1d4970bb40 (LWP 6603))] (gdb) bt #0 0x000055baf6ab4adc in qemu_opt_foreach (opts=0x0, func=0x55baf696b650 <net_vhost_chardev_opts>, opaque=0x7ffc51368c00, errp=0x7ffc51368e48) at util/qemu-option.c:617 #1 0x000055baf696b7da in net_vhost_parse_chardev (opts=0x55baf8ff9260, errp=0x7ffc51368e48) at net/vhost-user.c:314 #2 0x000055baf696b985 in net_init_vhost_user (netdev=0x55baf8ff9250, name=0x55baf879d270 "hostnet2", peer=0x0, errp=0x7ffc51368e48) at net/vhost-user.c:360 #3 0x000055baf6960216 in net_client_init1 (object=0x55baf8ff9250, is_netdev=true, errp=0x7ffc51368e48) at net/net.c:1051 #4 0x000055baf6960518 in net_client_init (opts=0x55baf776e7e0, is_netdev=true, errp=0x7ffc51368f00) at net/net.c:1108 #5 0x000055baf696083f in netdev_add (opts=0x55baf776e7e0, errp=0x7ffc51368f00) at net/net.c:1186 #6 0x000055baf69608c7 in qmp_netdev_add (qdict=0x55baf7afaf60, ret=0x7ffc51368f50, errp=0x7ffc51368f48) at net/net.c:1205 #7 0x000055baf6622135 in handle_qmp_command (parser=0x55baf77fb590, tokens=0x7f1d24011960) at /path/to/qemu.git/monitor.c:3978 #8 0x000055baf6a9d099 in json_message_process_token (lexer=0x55baf77fb598, input=0x55baf75acd20, type=JSON_RCURLY, x=113, y=19) at qobject/json-streamer.c:105 #9 0x000055baf6abf7aa in json_lexer_feed_char (lexer=0x55baf77fb598, ch=125 '}', flush=false) at qobject/json-lexer.c:319 #10 0x000055baf6abf8f2 in json_lexer_feed (lexer=0x55baf77fb598, buffer=0x7ffc51369170 "}R\204\367\272U", size=1) at qobject/json-lexer.c:369 #11 0x000055baf6a9d13c in json_message_parser_feed (parser=0x55baf77fb590, buffer=0x7ffc51369170 "}R\204\367\272U", size=1) at qobject/json-streamer.c:124 #12 0x000055baf66221f7 in monitor_qmp_read (opaque=0x55baf77fb530, buf=0x7ffc51369170 "}R\204\367\272U", size=1) at /path/to/qemu.git/monitor.c:3994 #13 0x000055baf6757014 in qemu_chr_be_write_impl (s=0x55baf7610a40, buf=0x7ffc51369170 "}R\204\367\272U", len=1) at qemu-char.c:387 #14 0x000055baf6757076 in qemu_chr_be_write (s=0x55baf7610a40, buf=0x7ffc51369170 "}R\204\367\272U", len=1) at qemu-char.c:399 #15 0x000055baf675b3b0 in tcp_chr_read (chan=0x55baf90244b0, cond=G_IO_IN, opaque=0x55baf7610a40) at qemu-char.c:2927 #16 0x000055baf6a5d655 in qio_channel_fd_source_dispatch (source=0x55baf7610df0, callback=0x55baf675b25a <tcp_chr_read>, user_data=0x55baf7610a40) at io/channel-watch.c:84 #17 0x00007f1d3e80cbbd in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #18 0x000055baf69d3720 in glib_pollfds_poll () at main-loop.c:213 #19 0x000055baf69d37fd in os_host_main_loop_wait (timeout=126000000) at main-loop.c:258 #20 0x000055baf69d38ad in main_loop_wait (nonblocking=0) at main-loop.c:506 #21 0x000055baf676587b in main_loop () at vl.c:1908 #22 0x000055baf676d3bf in main (argc=101, argv=0x7ffc5136a6c8, envp=0x7ffc5136a9f8) at vl.c:4604 (gdb) p opts $1 = (QemuOpts *) 0x0 The crash occurred when attaching vhost-user net via QMP: { "execute": "chardev-add", "arguments": { "id": "charnet2", "backend": { "type": "socket", "data": { "addr": { "type": "unix", "data": { "path": "/var/run/openvswitch/vhost-user1" } }, "wait": false, "server": false } } }, "id": "libvirt-19" } { "return": { }, "id": "libvirt-19" } { "execute": "netdev_add", "arguments": { "type": "vhost-user", "chardev": "charnet2", "id": "hostnet2" }, "id": "libvirt-20" } Code using chardevs should not be poking at the internals of the CharDriverState struct. What vhost-user wants is a chardev that is operating as reconnectable network service, along with the ability to do FD passing over the connection. The colo code simply wants a network service. Add a feature concept to the char drivers so that chardev users can query the actual features they wish to have supported. The QemuOpts member is removed to prevent future mistakes in this area. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: wait until backend init is completedMarc-André Lureau2016-07-281-2/+16
| | | | | | | | | | | | | | | The chardev waits for an initial connection before starting qemu, and vhost-user should wait for the backend negotiation to be completed before starting qemu too. vhost-user is started in the net_vhost_user_event callback, which is synchronously called after the socket is connected. Use a VhostUserState.started flag to indicate vhost-user init completed successfully and qemu can be started. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: add get_vhost_net() assertionsMarc-André Lureau2016-07-281-0/+2
| | | | | | | | | | Add a few assertions to be more explicit about the runtime behaviour after the previous patch: get_vhost_net() is non-null after net_vhost_user_init(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: keep vhost_net after a disconnectionMarc-André Lureau2016-07-281-17/+19
| | | | | | | | | | | | | | | Many code paths assume get_vhost_net() returns non-null. Keep VhostUserState.vhost_net after a successful vhost_net_init(), instead of freeing it in vhost_net_cleanup(). VhostUserState.vhost_net is thus freed before after being recreated or on final vhost_user_cleanup() and there is no need to save the acked features. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: disconnect on HUPMarc-André Lureau2016-07-281-5/+1Star
| | | | | | | | | | | | | | In some cases, qemu_chr_fe_read_all() on HUP event doesn't raise CHR_EVENT_CLOSED because the read/recv function returns -1 on disconnected peers (for example with tch_chr_recv, an ECONNRESET errno overwritten as EIO). It is simpler to explicitely disconnect on HUP, rising CHR_EVENT_CLOSED if it wasn't disconnected already. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: minor simplificationMarc-André Lureau2016-07-281-2/+1Star
| | | | | | | | | Shorten the code and make it more clear by using the specialized function g_str_has_prefix(). Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* qapi: Change Netdev into a flat unionEric Blake2016-07-191-10/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a mostly-mechanical conversion that creates a new flat union 'Netdev' QAPI type that covers all the branches of the former 'NetClientOptions' simple union, where the branches are now listed in a new 'NetClientDriver' enum rather than generated from the simple union. The existence of a flat union has no change to the command line syntax accepted for new code, and will make it possible for a future patch to switch the QMP command to parse a boxed union for no change to valid QMP; but it does have some ripple effect on the C code when dealing with the new types. While making the conversion, note that the 'NetLegacy' type remains unchanged: it applies only to legacy command line options, and will not be ported to QMP, so it should remain a wrapper around a simple union; to avoid confusion, the type named 'NetClientOptions' is now gone, and we introduce 'NetLegacyOptions' in its place. Then, in the C code, we convert from NetLegacy to Netdev as soon as possible, so that the bulk of the net stack only has to deal with one QAPI type, not two. Note that since the old legacy code always rejected 'hubport', we can just omit that branch from the new 'NetLegacyOptions' simple union. Based on an idea originally by Zoltán Kővágó <DirtY.iCE.hu@gmail.com>: Message-Id: <01a527fbf1a5de880091f98cf011616a78adeeee.1441627176.git.DirtY.iCE.hu@gmail.com> although the sed script in that patch no longer applies due to other changes in the tree since then, and I also did some manual cleanups (such as fixing whitespace to keep checkpatch happy). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1468468228-27827-13-git-send-email-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Fixup from Eric squashed in] Signed-off-by: Markus Armbruster <armbru@redhat.com>
* net: use Netdev instead of NetClientOptions in client initKővágó, Zoltán2016-07-191-3/+3
| | | | | | | | | | | | | | | | | | | | | This way we no longer need NetClientOptions and can convert Netdev into a flat union. Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <93ffdfed7054529635e6acb935150d95dc173a12.1441627176.git.DirtY.iCE.hu@gmail.com> [rework net_client_init1() to pass Netdev by copying from NetdevLegacy, rather than merging the two types - which means that we still need NetClientOptions after all. Rebase to qapi changes. The bulk of the patch is mechanical, replacing 'opts' by 'netdev->opts', while net_client_init1() takes care of converting between legacy and modern types.] Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1468468228-27827-2-git-send-email-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
* tap: vhost busy polling supportJason Wang2016-07-071-0/+1
| | | | | | | | | | | This patch add the capability of basic vhost net busy polling which is supported by recent kernel. User could configure the maximum number of us that could be spent on busy polling through a new property of tap "poll-us". Cc: Greg Kurz <groug@kaod.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
* vhost-user: disable chardev handlers on closePaolo Bonzini2016-06-291-0/+5
| | | | | | | | This otherwise causes a use-after-free if network backend cleanup is performed before character device cleanup. Cc: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: change qemu_chr_fe_add_watch to return unsignedPaolo Bonzini2016-06-291-1/+1
| | | | | | | | | | | | | | | g_source_attach can return any value between 1 and UINT_MAX if you let QEMU run long enough. However, qemu_chr_fe_add_watch can also return a negative errno value when the device is disconnected or does not support chr_add_watch. Change it to return zero to avoid overloading these values. Fix the cadence_uart which asserts in this case (easily obtained with "-serial pty"). Tested-by: Bret Ketchum <bcketchum@gmail.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* vhost-net: save & restore vhost-user acked featuresMarc-André Lureau2016-06-171-0/+10
| | | | | | | | | | | | | | | The initial vhost-user connection sets the features to be negotiated with the driver. Renegotiation isn't possible without device reset. To handle reconnection of vhost-user backend, ensure the same set of features are provided, and reuse already acked features. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: disconnect on start failureMarc-André Lureau2016-06-171-1/+2
| | | | | | | | | | | | | If the backend failed to start (for example feature negociation failed), do not exit, but disconnect the char device instead. Slightly more robust for reconnect case. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: add ability to know vhost-user backend disconnectionTetsuya Mukawa2016-06-171-0/+19
| | | | | | | | | | | | | | | | Current QEMU cannot detect vhost-user backend disconnection. The patch adds ability to know it. To know disconnection, add watcher to detect G_IO_HUP event. When G_IO_HUP event is detected, the disconnected socket will be read to cause a CHR_EVENT_CLOSED. Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* qapi: Don't special-case simple union wrappersEric Blake2016-03-181-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Simple unions were carrying a special case that hid their 'data' QMP member from the resulting C struct, via the hack method QAPISchemaObjectTypeVariant.simple_union_type(). But by using the work we started by unboxing flat union and alternate branches, coupled with the ability to visit the members of an implicit type, we can now expose the simple union's implicit type in qapi-types.h: | struct q_obj_ImageInfoSpecificQCow2_wrapper { | ImageInfoSpecificQCow2 *data; | }; | | struct q_obj_ImageInfoSpecificVmdk_wrapper { | ImageInfoSpecificVmdk *data; | }; ... | struct ImageInfoSpecific { | ImageInfoSpecificKind type; | union { /* union tag is @type */ | void *data; |- ImageInfoSpecificQCow2 *qcow2; |- ImageInfoSpecificVmdk *vmdk; |+ q_obj_ImageInfoSpecificQCow2_wrapper qcow2; |+ q_obj_ImageInfoSpecificVmdk_wrapper vmdk; | } u; | }; Doing this removes asymmetry between QAPI's QMP side and its C side (both sides now expose 'data'), and means that the treatment of a simple union as sugar for a flat union is now equivalent in both languages (previously the two approaches used a different layer of dereferencing, where the simple union could be converted to a flat union with equivalent C layout but different {} on the wire, or to an equivalent QMP wire form but with different C representation). Using the implicit type also lets us get rid of the simple_union_type() hack. Of course, now all clients of simple unions have to adjust from using su->u.member to using su->u.member.data; while this touches a number of files in the tree, some earlier cleanup patches helped minimize the change to the initialization of a temporary variable rather than every single member access. The generated qapi-visit.c code is also affected by the layout change: |@@ -7393,10 +7393,10 @@ void visit_type_ImageInfoSpecific_member | } | switch (obj->type) { | case IMAGE_INFO_SPECIFIC_KIND_QCOW2: |- visit_type_ImageInfoSpecificQCow2(v, "data", &obj->u.qcow2, &err); |+ visit_type_q_obj_ImageInfoSpecificQCow2_wrapper_members(v, &obj->u.qcow2, &err); | break; | case IMAGE_INFO_SPECIFIC_KIND_VMDK: |- visit_type_ImageInfoSpecificVmdk(v, "data", &obj->u.vmdk, &err); |+ visit_type_q_obj_ImageInfoSpecificVmdk_wrapper_members(v, &obj->u.vmdk, &err); | break; | default: | abort(); Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1458254921-17042-13-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
* vhost-user: remove useless is_server fieldMarc-André Lureau2016-03-111-2/+0Star
| | | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: fix use after freeMarc-André Lureau2016-03-111-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | "name" is freed after visiting options, instead use the first NetClientState name. Adds a few assert() for clarifying and checking some impossible states. READ of size 1 at 0x602000000990 thread T0 #0 0x7f6b251c570c (/lib64/libasan.so.2+0x4770c) #1 0x5566dc380600 in qemu_find_net_clients_except net/net.c:824 #2 0x5566dc39bac7 in net_vhost_user_event net/vhost-user.c:193 #3 0x5566dbee862a in qemu_chr_be_event /home/elmarco/src/qemu/qemu-char.c:201 #4 0x5566dbef2890 in tcp_chr_disconnect /home/elmarco/src/qemu/qemu-char.c:2790 #5 0x5566dbef2d0b in tcp_chr_sync_read /home/elmarco/src/qemu/qemu-char.c:2835 #6 0x5566dbee8a99 in qemu_chr_fe_read_all /home/elmarco/src/qemu/qemu-char.c:295 #7 0x5566dc39b964 in net_vhost_user_watch net/vhost-user.c:180 #8 0x5566dc5a06c7 in qio_channel_fd_source_dispatch io/channel-watch.c:70 #9 0x7f6b1aa2ab87 in g_main_dispatch /home/elmarco/src/gnome/glib/glib/gmain.c:3154 #10 0x7f6b1aa2b9cb in g_main_context_dispatch /home/elmarco/src/gnome/glib/glib/gmain.c:3769 #11 0x5566dc475ed4 in glib_pollfds_poll /home/elmarco/src/qemu/main-loop.c:212 #12 0x5566dc476029 in os_host_main_loop_wait /home/elmarco/src/qemu/main-loop.c:257 #13 0x5566dc476165 in main_loop_wait /home/elmarco/src/qemu/main-loop.c:505 #14 0x5566dbf08d31 in main_loop /home/elmarco/src/qemu/vl.c:1932 #15 0x5566dbf16783 in main /home/elmarco/src/qemu/vl.c:4646 #16 0x7f6b180bb57f in __libc_start_main (/lib64/libc.so.6+0x2057f) #17 0x5566dbbf5348 in _start (/home/elmarco/src/qemu/x86_64-softmmu/qemu-system-x86_64+0x3f9348) 0x602000000990 is located 0 bytes inside of 5-byte region [0x602000000990,0x602000000995) freed by thread T0 here: #0 0x7f6b2521666a in __interceptor_free (/lib64/libasan.so.2+0x9866a) #1 0x7f6b1aa332a4 in g_free /home/elmarco/src/gnome/glib/glib/gmem.c:189 #2 0x5566dc5f416f in qapi_dealloc_type_str qapi/qapi-dealloc-visitor.c:134 #3 0x5566dc5f3268 in visit_type_str qapi/qapi-visit-core.c:196 #4 0x5566dc5ced58 in visit_type_Netdev_fields /home/elmarco/src/qemu/qapi-visit.c:5936 #5 0x5566dc5cef71 in visit_type_Netdev /home/elmarco/src/qemu/qapi-visit.c:5960 #6 0x5566dc381a8d in net_visit net/net.c:1049 #7 0x5566dc381c37 in net_client_init net/net.c:1076 #8 0x5566dc3839e2 in net_init_netdev net/net.c:1473 #9 0x5566dc63cc0a in qemu_opts_foreach util/qemu-option.c:1112 #10 0x5566dc383b36 in net_init_clients net/net.c:1499 #11 0x5566dbf15d86 in main /home/elmarco/src/qemu/vl.c:4397 #12 0x7f6b180bb57f in __libc_start_main (/lib64/libc.so.6+0x2057f) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* vhost-user: verify that number of queues is less than MAX_QUEUE_NUMIlya Maximets2016-03-111-2/+3
| | | | | | | | | | Fix QEMU crash when -netdev vhost-user,queues=n is passed with number of queues greater than MAX_QUEUE_NUM. Signed-off-by: Ilya Maximets <i.maximets@samsung.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
* net: Clean up includesPeter Maydell2016-02-041-0/+1
| | | | | | | | | | 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: 1454089805-5470-11-git-send-email-peter.maydell@linaro.org
* error: Strip trailing '\n' from error string arguments (again)Markus Armbruster2016-01-131-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Commit 6daf194d, be62a2eb and 312fd5f got rid of a bunch, but they keep coming back. Tracked down with the Coccinelle semantic patch from commit 312fd5f. Cc: Fam Zheng <famz@redhat.com> Cc: Peter Crosthwaite <crosthwaitepeter@gmail.com> Cc: Bharata B Rao <bharata@linux.vnet.ibm.com> Cc: Dominik Dingel <dingel@linux.vnet.ibm.com> Cc: David Hildenbrand <dahi@linux.vnet.ibm.com> Cc: Jason J. Herne <jjherne@linux.vnet.ibm.com> Cc: Stefan Berger <stefanb@linux.vnet.ibm.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Changchun Ouyang <changchun.ouyang@intel.com> Cc: zhanghailiang <zhang.zhanghailiang@huawei.com> Cc: Pavel Fedin <p.fedin@samsung.com> Signed-off-by: Markus Armbruster <armbru@pond.sub.org> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Acked-by: Fam Zheng <famz@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1450452927-8346-17-git-send-email-armbru@redhat.com>
* vhost-user: verify that number of queues is non-zeroVictor Kaplansky2015-12-021-0/+5
| | | | | | | | | | Fix QEMU crash when -netdev type=vhost-user,queues=n is passed with zero number of queues. Signed-off-by: Victor Kaplansky <victork@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
* vhost-user: set link down when the char device is closedWen Congyang2015-11-251-1/+1
| | | | | | | Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
* net: Convert to new qapi union layoutEric Blake2015-11-021-2/+2
| | | | | | | | | | | | | | | | | We have two issues with our qapi union layout: 1) Even though the QMP wire format spells the tag 'type', the C code spells it 'kind', requiring some hacks in the generator. 2) The C struct uses an anonymous union, which places all tag values in the same namespace as all non-variant members. This leads to spurious collisions if a tag value matches a non-variant member's name. Make the conversion to the new layout for net-related code. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1445898903-12082-18-git-send-email-eblake@redhat.com> [Commit message tweaked slightly] Signed-off-by: Markus Armbruster <armbru@redhat.com>
* vhost user: add rarp sending after live migration for legacy guestThibaut Collet2015-10-221-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | | A new vhost user message is added to allow QEMU to ask to vhost user backend to broadcast a fake RARP after live migration for guest without GUEST_ANNOUNCE capability. This new message is sent only if the backend supports the new VHOST_USER_PROTOCOL_F_RARP protocol feature. The payload of this new message is the MAC address of the guest (not known by the backend). The MAC address is copied in the first 6 bytes of a u64 to avoid to create a new payload message type. This new message has no equivalent ioctl so a new callback is added in the userOps structure to send the request. Upon reception of this new message the vhost user backend must generate and broadcast a fake RARP request to notify the migration is terminated. Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com> [Rebased and fixed checkpatch errors - Marc-André] Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
* vhost user: add support of live migrationThibaut Collet2015-10-221-2/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | Some vhost user backends are able to support live migration. To provide this service the following features must be added: 1. Add the VIRTIO_NET_F_GUEST_ANNOUNCE capability to vhost-net when netdev backend is vhost-user. 2. Provide a nop receive callback to vhost-user. This callback is called by: * qemu_announce_self after a migration to send fake RARP to avoid network outage for peers talking to the migrated guest. - For guest with GUEST_ANNOUNCE capabilities, guest already sends GARP when the bit VIRTIO_NET_S_ANNOUNCE is set. => These packets must be discarded. - For guest without GUEST_ANNOUNCE capabilities, migration termination is notified when the guest sends packets. => These packets can be discarded. * virtio_net_tx_bh with a dummy boot to send fake bootp/dhcp request. BIOS guest manages virtio driver to send 4 bootp/dhcp request in case of dummy boot. => These packets must be discarded. Signed-off-by: Thibaut Collet <thibaut.collet@6wind.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
* net: add trace_vhost_user_eventMarc-André Lureau2015-10-221-2/+2
| | | | | | | | | | Replace error_report() and use tracing instead. It's not an error to get a connection or a disconnection, so silence this and trace it instead. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Thibaut Collet <thibaut.collet@6wind.com>
* vhost-user: add multiple queue supportChangchun Ouyang2015-09-241-48/+93
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch is initially based a patch from Nikolay Nikolaev. This patch adds vhost-user multiple queue support, by creating a nc and vhost_net pair for each queue. Qemu exits if find that the backend can't support the number of requested queues (by providing queues=# option). The max number is queried by a new message, VHOST_USER_GET_QUEUE_NUM, and is sent only when protocol feature VHOST_USER_PROTOCOL_F_MQ is present first. The max queue check is done at vhost-user initiation stage. We initiate one queue first, which, in the meantime, also gets the max_queues the backend supports. In older version, it was reported that some messages are sent more times than necessary. Here we came an agreement with Michael that we could categorize vhost user messages to 2 types: non-vring specific messages, which should be sent only once, and vring specific messages, which should be sent per queue. Here I introduced a helper function vhost_user_one_time_request(), which lists following messages as non-vring specific messages: VHOST_USER_SET_OWNER VHOST_USER_RESET_DEVICE VHOST_USER_SET_MEM_TABLE VHOST_USER_GET_QUEUE_NUM For above messages, we simply ignore them when they are not sent the first time. Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
* Revert "vhost-user: add multi queue support"Michael S. Tsirkin2015-07-201-24/+13Star
| | | | | | | | | This reverts commit 830d70db692e374b55555f4407f96a1ceefdcc97. The interface isn't fully backwards-compatible, which is bad. Let's redo this properly after 2.4. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into stagingPeter Maydell2015-06-191-1/+0Star
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | virtio, pci fixes, enhancements Most notably this includes virtio cross-endian patches. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> # gpg: Signature made Fri Jun 19 11:18:05 2015 BST using RSA key ID D28D5469 # gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" # gpg: aka "Michael S. Tsirkin <mst@redhat.com>" * remotes/mst/tags/for_upstream: vhost: enable vhost without without MSI-X pci: Don't register a specialized 'config_write' if default behavior is intended hw/core: rebase sysbus_get_fw_dev_path() to g_strdup_printf() vhost_net: re-enable when cross endian vhost-net: tell tap backend about the vnet endianness tap: fix non-linux build tap: add VNET_LE/VNET_BE operations vhost: set vring endianness for legacy virtio virtio: introduce virtio_legacy_is_cross_endian() linux-headers: sync vhost.h vhost-user: part of virtio Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| * vhost: enable vhost without without MSI-XPankaj Gupta2015-06-191-1/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We use vhostforce to enable vhost even if Guests don't have MSI-X support and we fall back to QEMU virtio-net. This gives a very small performance gain, but the disadvantage is that guest now controls which virtio code is running (qemu or vhost) so our attack surface is doubled. This patch will enable vhost unconditionally whenever it's requested. For compatibility, enable vhost when vhostforce is set, as well. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com>
* | vhost-user: Improve -netdev/netdev_add/-net/... error reportingMarkus Armbruster2015-06-091-13/+12Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When -netdev vhost-user fails, it first reports a specific error, then one or more generic ones, like this: $ qemu-system-x86_64 -netdev vhost-user,id=foo,chardev=xxx qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: chardev "xxx" not found qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: No suitable chardev found qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: Device 'vhost-user' could not be initialized With the command line, the messages go to stderr. In HMP, they go to the monitor. In QMP, the last one becomes the error reply, and the others go to stderr. Convert net_init_vhost_user() and its helpers to Error. This suppresses the unwanted unspecific error messages, and makes the specific error the QMP error reply. Cc: Stefan Hajnoczi <stefanha@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
* | QemuOpts: Convert qemu_opt_foreach() to ErrorMarkus Armbruster2015-06-091-3/+4
| | | | | | | | | | | | | | | | Retain the function value for now, to permit selective conversion of its callers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* | QemuOpts: Drop qemu_opt_foreach() parameter abort_on_failureMarkus Armbruster2015-06-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the argument is non-zero, qemu_opt_foreach() stops on callback returning non-zero, and returns that value. When the argument is zero, it doesn't stop, and returns the callback's value from the last iteration. The two callers that pass zero could just as well pass one: * qemu_spice_init()'s callback add_channel() either returns zero or exit()s. * config_write_opts()'s callback config_write_opt() always returns zero. Drop the parameter, and always stop. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* | QemuOpts: Convert qemu_opts_foreach() to ErrorMarkus Armbruster2015-06-091-2/+2
| | | | | | | | | | | | | | | | | | Retain the function value for now, to permit selective conversion of its callers. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Acked-by: Kevin Wolf <kwolf@redhat.com>
* | QemuOpts: Drop qemu_opts_foreach() parameter abort_on_failureMarkus Armbruster2015-06-081-1/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | When the argument is non-zero, qemu_opts_foreach() stops on callback returning non-zero, and returns that value. When the argument is zero, it doesn't stop, and returns the bit-wise inclusive or of all the return values. Funky :) The callers that pass zero could just as well pass one, because their callbacks can't return anything but zero: * qemu_add_globals()'s callback qdev_add_one_global() * qemu_config_write()'s callback config_write_opts() * main()'s callbacks default_driver_check(), drive_enable_snapshot(), vnc_init_func() Drop the parameter, and always stop. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Acked-by: Kevin Wolf <kwolf@redhat.com>
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-12-22 19:19:39 +0100