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2023-05-19nbd/server: Fix drained_poll to wake coroutine in right AioContextKevin Wolf
nbd_drained_poll() generally runs in the main thread, not whatever iothread the NBD server coroutine is meant to run in, so it can't directly reenter the coroutines to wake them up. The code seems to have the right intention, it specifies the correct AioContext when it calls qemu_aio_coroutine_enter(). However, this functions doesn't schedule the coroutine to run in that AioContext, but it assumes it is already called in the home thread of the AioContext. To fix this, add a new thread-safe qio_channel_wake_read() that can be called in the main thread to wake up the coroutine in its AioContext, and use this in nbd_drained_poll(). Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20230517152834.277483-3-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2023-04-20io: mark mixed functions that can suspendPaolo Bonzini
There should be no paths from a coroutine_fn to aio_poll, however in practice coroutine_mixed_fn will call aio_poll in the !qemu_in_coroutine() path. By marking mixed functions, we can track accurately the call paths that execute entirely in coroutine context, and find more missing coroutine_fn markers. This results in more accurate checks that coroutine code does not end up blocking. If the marking were extended transitively to all functions that call these ones, static analysis could be done much more efficiently. However, this is a start and makes it possible to use vrc's path-based searches to find potential bugs where coroutine_fns call blocking functions. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-02-06io: Add support for MSG_PEEK for socket channelmanish.mishra
MSG_PEEK peeks at the channel, The data is treated as unread and the next read shall still return this data. This support is currently added only for socket class. Extra parameter 'flags' is added to io_readv calls to pass extra read flags like MSG_PEEK. Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Suggested-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: manish.mishra <manish.mishra@nutanix.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2023-01-20coroutine: Split qemu/coroutine-core.h off qemu/coroutine.hMarkus Armbruster
qemu/coroutine.h and qemu/lockable.h include each other. They need each other only in macro expansions, so we could simply drop both inclusions to break the loop, and add suitable includes to files that expand the macros. Instead, move a part of qemu/coroutine.h to new qemu/coroutine-core.h so that qemu/coroutine-core.h doesn't need qemu/lockable.h, and qemu/lockable.h only needs qemu/coroutine-core.h. Result: qemu/coroutine.h includes qemu/lockable.h includes qemu/coroutine-core.h. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20221221131435.3851212-5-armbru@redhat.com> [Semantic rebase conflict with 7c10cb38cc "accel/tcg: Add debuginfo support" resolved]
2022-12-14io: Tidy up fat-fingered parameter nameMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20221121085054.683122-11-armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2022-05-16QIOChannel: Add flags on io_writev and introduce io_flush callbackLeonardo Bras
Add flags to io_writev and introduce io_flush as optional callback to QIOChannelClass, allowing the implementation of zero copy writes by subclasses. How to use them: - Write data using qio_channel_writev*(...,QIO_CHANNEL_WRITE_FLAG_ZERO_COPY), - Wait write completion with qio_channel_flush(). Notes: As some zero copy write implementations work asynchronously, it's recommended to keep the write buffer untouched until the return of qio_channel_flush(), to avoid the risk of sending an updated buffer instead of the buffer state during write. As io_flush callback is optional, if a subclass does not implement it, then: - io_flush will return 0 without changing anything. Also, some functions like qio_channel_writev_full_all() were adapted to receive a flag parameter. That allows shared code between zero copy and non-zero copy writev, and also an easier implementation on new flags. Signed-off-by: Leonardo Bras <leobras@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20220513062836.965425-3-leobras@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-10io: add qio_channel_readv_full_all_eof & qio_channel_readv_full_all helpersElena Ufimtseva
Adds qio_channel_readv_full_all_eof() and qio_channel_readv_full_all() to read both data and FDs. Refactors existing code to use these helpers. Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Acked-by: Daniel P. Berrangé <berrange@redhat.com> Message-id: b059c4cc0fb741e794d644c144cc21372cad877d.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10io: add qio_channel_writev_full_all helperElena Ufimtseva
Adds qio_channel_writev_full_all() to transmit both data and FDs. Refactors existing code to use this helper. Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Daniel P. Berrangé <berrange@redhat.com> Message-id: 480fbf1fe4152495d60596c9b665124549b426a5.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-01-13io: Document qmp oob suitability of qio_channel_shutdown and io_shutdownLukas Straub
Migration and yank code assume that qio_channel_shutdown is thread -safe and can be called from qmp oob handler. Document this after checking the code. Signed-off-by: Lukas Straub <lukasstraub2@web.de> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <32b8c27e256da043f0f00db05bd7ab8fbc506070.1609167865.git.lukasstraub2@web.de> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-10-27io: Fix Lesser GPL version numberChetan Pant
There is no "version 2" of the "Lesser" General Public License. It is either "GPL version 2.0" or "Lesser GPL version 2.1". This patch replaces all occurrences of "Lesser GPL version 2" with "Lesser GPL version 2.1" in comment section. Signed-off-by: Chetan Pant <chetan4windows@gmail.com> Acked-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20201014134033.14095-1-chetan4windows@gmail.com> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2020-09-18qom: Remove module_obj_name parameter from OBJECT_DECLARE* macrosEduardo Habkost
One of the goals of having less boilerplate on QOM declarations is to avoid human error. Requiring an extra argument that is never used is an opportunity for mistakes. Remove the unused argument from OBJECT_DECLARE_TYPE and OBJECT_DECLARE_SIMPLE_TYPE. Coccinelle patch used to convert all users of the macros: @@ declarer name OBJECT_DECLARE_TYPE; identifier InstanceType, ClassType, lowercase, UPPERCASE; @@ OBJECT_DECLARE_TYPE(InstanceType, ClassType, - lowercase, UPPERCASE); @@ declarer name OBJECT_DECLARE_SIMPLE_TYPE; identifier InstanceType, lowercase, UPPERCASE; @@ OBJECT_DECLARE_SIMPLE_TYPE(InstanceType, - lowercase, UPPERCASE); Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Acked-by: Cornelia Huck <cohuck@redhat.com> Acked-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Paul Durrant <paul@xen.org> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20200916182519.415636-4-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Use OBJECT_DECLARE_TYPE where possibleEduardo Habkost
Replace DECLARE_OBJ_CHECKERS with OBJECT_DECLARE_TYPE where the typedefs can be safely removed. Generated running: $ ./scripts/codeconverter/converter.py -i \ --pattern=DeclareObjCheckers $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20200831210740.126168-16-ehabkost@redhat.com> Message-Id: <20200831210740.126168-17-ehabkost@redhat.com> Message-Id: <20200831210740.126168-18-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Use DECLARE_*CHECKER* macrosEduardo Habkost
Generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=TypeCheckMacro $(git grep -l '' -- '*.[ch]') Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-12-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-13-ehabkost@redhat.com> Message-Id: <20200831210740.126168-14-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-09Move QOM typedefs and add missing includesEduardo Habkost
Some typedefs and macros are defined after the type check macros. This makes it difficult to automatically replace their definitions with OBJECT_DECLARE_TYPE. Patch generated using: $ ./scripts/codeconverter/converter.py -i \ --pattern=QOMStructTypedefSplit $(git grep -l '' -- '*.[ch]') which will split "typdef struct { ... } TypedefName" declarations. Followed by: $ ./scripts/codeconverter/converter.py -i --pattern=MoveSymbols \ $(git grep -l '' -- '*.[ch]') which will: - move the typedefs and #defines above the type check macros - add missing #include "qom/object.h" lines if necessary Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-9-ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <20200831210740.126168-10-ehabkost@redhat.com> Message-Id: <20200831210740.126168-11-ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-06-12Include qemu-common.h exactly where neededMarkus Armbruster
No header includes qemu-common.h after this commit, as prescribed by qemu-common.h's file comment. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-5-armbru@redhat.com> [Rebased with conflicts resolved automatically, except for include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and net/tap-bsd.c fixed up]
2019-02-25io: Make qio_channel_yield() interruptibleKevin Wolf
Similar to how qemu_co_sleep_ns() allows preemption from an external coroutine entry, allow reentering qio_channel_yield() early. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-11-19io: return 0 for EOF in TLS session read after shutdownDaniel P. Berrangé
GNUTLS takes a paranoid approach when seeing 0 bytes returned by the underlying OS read() function. It will consider this an error and return GNUTLS_E_PREMATURE_TERMINATION instead of propagating the 0 return value. It expects apps to arrange for clean termination at the protocol level and not rely on seeing EOF from a read call to detect shutdown. This is to harden apps against a malicious 3rd party causing termination of the sockets layer. This is unhelpful for the QEMU NBD code which does have a clean protocol level shutdown, but still relies on seeing 0 from the I/O channel read in the coroutine handling incoming replies. The upshot is that when using a plain NBD connection shutdown is silent, but when using TLS, the client spams the console with Cannot read from TLS channel: Broken pipe The NBD connection has, however, called qio_channel_shutdown() at this point to indicate that it is done with I/O. This gives the opportunity to optimize the code such that when the channel has been shutdown in the read direction, the error code GNUTLS_E_PREMATURE_TERMINATION gets turned into a '0' return instead of an error. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20181119134228.11031-1-berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
2018-03-06qio: introduce qio_channel_add_watch_{full|source}Peter Xu
Firstly, introduce an internal qio_channel_add_watch_full(), which enhances qio_channel_add_watch() that context can be specified. Then add a new API wrapper qio_channel_add_watch_source() to return a GSource pointer rather than a tag ID. Note that the _source() call will keep a reference of GSource so that callers need to unref them explicitly when finished using the GSource. Signed-off-by: Peter Xu <peterx@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2017-09-06io: Add new qio_channel_read{, v}_all_eof functionsEric Blake
Some callers want to distinguish between clean EOF (no bytes read) vs. a short read (at least one byte read, but EOF encountered before reaching the desired length), as it allows clients the ability to do a graceful shutdown when a server shuts down at defined safe points in the protocol, rather than treating all shutdown scenarios as an error due to EOF. However, we don't want to require all callers to have to check for early EOF. So add another wrapper function that can be used by the callers that care about the distinction. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20170905191114.5959-3-eblake@redhat.com> Acked-by: Daniel P. Berrange <berrange@redhat.com>
2017-09-05io: add new qio_channel_{readv, writev, read, write}_all functionsDaniel P. Berrange
These functions wait until they are able to read / write the full requested data buffer(s). Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-09-05io: fix typo in docs comment for qio_channel_readDaniel P. Berrange
Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-05-07doc: fix function spellingMarc-André Lureau
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2017-02-21io: make qio_channel_yield aware of AioContextsPaolo Bonzini
Support separate coroutines for reading and writing, and place the read/write handlers on the AioContext that the QIOChannel is registered with. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-7-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2017-02-21io: add methods to set I/O handlers on AioContextPaolo Bonzini
This is in preparation for making qio_channel_yield work on AioContexts other than the main one. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-6-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2016-10-27io: add ability to set a name for IO channelsDaniel P. Berrange
The GSource object has ability to have a name, which is useful when debugging performance problems with the mainloop event callbacks that take too long. By associating a name with a QIOChannel object, we can then set the name on any GSource associated with the channel. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-10-26io: Introduce a qio_channel_set_feature() helperFelipe Franciosi
Testing QIOChannel feature support can be done with a helper called qio_channel_has_feature(). Setting feature support, however, was done manually with a logical OR. This patch introduces a new helper called qio_channel_set_feature() and makes use of it where applicable. Signed-off-by: Felipe Franciosi <felipe@nutanix.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-10-26io: Fix double shift usages on QIOChannel featuresFelipe Franciosi
When QIOChannels were introduced in 666a3af9, the feature bits were already defined shifted. However, when using them, the code was shifting them again. The incorrect use was consistent until 74b6ce43, where QIO_CHANNEL_FEATURE_LISTEN was defined shifted but tested unshifted. This patch changes the definition to be unshifted and fixes the incorrect usage introduced on 74b6ce43. Signed-off-by: Felipe Franciosi <felipe@nutanix.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-07-12Clean up ill-advised or unusual header guardsMarkus Armbruster
Cleaned up with scripts/clean-header-guards.pl. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2016-06-29socket: add listen featureMarc-André Lureau
Add a flag to tell whether the channel socket is listening. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1466105332-10285-3-git-send-email-marcandre.lureau@redhat.com> Acked-by: Daniel P. Berrange <berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2016-03-10io: implement socket watch for win32 using WSAEventSelect+selectPaolo Bonzini
On Win32 we cannot directly poll on socket handles. Instead we create a Win32 event object and associate the socket handle with the event. When the event signals readyness we then have to use select to determine which events are ready. Creating Win32 events is moderately heavyweight, so we don't want todo it every time we create a GSource, so this associates a single event with a QIOChannel. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2016-02-23include: Clean up includesPeter Maydell
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. NB: If this commit breaks compilation for your out-of-tree patchseries or fork, then you need to make sure you add #include "qemu/osdep.h" to any new .c files that you have. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com>
2016-01-20io: fix description of @errp parameter initializationDaniel P. Berrange
The "Error **errp" parameters must be NULL initialized not uninitialized. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2015-12-18io: add abstract QIOChannel classesDaniel P. Berrange
Start the new generic I/O channel framework by defining a QIOChannel abstract base class. This is designed to feel similar to GLib's GIOChannel, but with the addition of support for using iovecs, qemu error reporting, file descriptor passing, coroutine integration and use of the QOM framework for easier sub-classing. The intention is that anywhere in QEMU that almost anywhere that deals with sockets will use this new I/O infrastructure, so that it becomes trivial to then layer in support for TLS encryption. This will at least include the VNC server, char device backend and migration code. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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