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* replay: remove some dead codePavel Dovgalyuk2020-11-091-3/+0Star
| | | | | | | | | This patch removes dead code in replay_continue_stop() function. Signed-off-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> Reported-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <160455661411.3455.4177953912304752892.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: do not build if TCG is not availableClaudio Fontana2020-10-222-2/+98
| | | | | | | | | | | | | | | | | | | | | | | this fixes non-TCG builds broken recently by replay reverse debugging. Stub the needed functions in stub/, splitting roughly between functions needed only by system emulation, by system emulation and tools, and by everyone. This includes duplicating some code in replay/, and puts the logic for non-replay related events in the replay/ module (+ the stubs), so this should be revisited in the future. Surprisingly, only _one_ qtest was affected by this, ide-test.c, which resulted in a buzz as the bh events were never delivered, and the bh never executed. Many other subsystems _should_ have been affected. This fixes the immediate issue, however a better way to group replay functionality to TCG-only code could be developed in the long term. Signed-off-by: Claudio Fontana <cfontana@suse.de> Message-Id: <20201013192123.22632-4-cfontana@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: create temporary snapshot at debugger connectionPavel Dovgalyuk2020-10-061-0/+14
| | | | | | | | | | | | | | | | | | When record/replay does not uses overlays for storing the snapshots, user is not capable of issuing reverse debugging commands. This patch adds creation of the VM snapshot on the temporary overlay image, when the debugger connects to QEMU. Therefore the execution can be rewind to the moment of the debugger connection while debugging the virtual machine. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> -- v6: - dropped unused error processing (suggested by Philippe Mathieu-Daudé) Message-Id: <160174524096.12451.11651270339216758643.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* gdbstub: add reverse continue support in replay modePavel Dovgalyuk2020-10-061-0/+72
| | | | | | | | | | | | | | | | This patch adds support of the reverse continue operation for gdbstub. Reverse continue finds the last breakpoint that would happen in normal execution from the beginning to the current moment. Implementation of the reverse continue replays the execution twice: to find the breakpoints that were hit and to seek to the last breakpoint. Reverse continue loads the previous snapshot and tries to find the breakpoint since that moment. If there are no such breakpoints, it proceeds to the earlier snapshot, and so on. When no breakpoints or watchpoints were hit at all, execution stops at the beginning of the replay log. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Message-Id: <160174522930.12451.6994758004725016836.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* gdbstub: add reverse step support in replay modePavel Dovgalyuk2020-10-061-0/+34
| | | | | | | | | | | | | | | | | | | | | | | | GDB remote protocol supports two reverse debugging commands: reverse step and reverse continue. This patch adds support of the first one to the gdbstub. Reverse step is intended to step one instruction in the backwards direction. This is not possible in regular execution. But replayed execution is deterministic, therefore we can load one of the prior snapshots and proceed to the desired step. It is equivalent to stepping one instruction back. There should be at least one snapshot preceding the debugged part of the replay log. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> -- v4 changes: - inverted condition in cpu_handle_guest_debug (suggested by Alex Bennée) Message-Id: <160174522341.12451.1498758422543765253.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: flush rr queue before loading the vmstatePavel Dovgalyuk2020-10-062-2/+4
| | | | | | | | | | | | | | Non-empty record/replay queue prevents saving and loading the VM state, because it includes pending bottom halves and block coroutines. But when the new VM state is loaded, we don't have to preserve the consistency of the current state anymore. Therefore this patch just flushes the queue allowing the coroutines to finish and removes checking for empty rr queue for load_snapshot function. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <160174521762.12451.15752448887893855757.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: implement replay-seek commandPavel Dovgalyuk2020-10-061-0/+87
| | | | | | | | | | | | | | | | | | | This patch adds hmp/qmp commands replay_seek/replay-seek that proceed the execution to the specified instruction count. The command automatically loads nearest snapshot and replays the execution to find the desired instruction count. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Acked-by: Markus Armbruster <armbru@redhat.com> -- v4 changes: - fixed HMP command description indent - removed useless error_free call Message-Id: <160174521180.12451.14033112911009278753.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: introduce breakpoint at the specified stepPavel Dovgalyuk2020-10-063-0/+105
| | | | | | | | | | | | | | | | | | | | | | This patch introduces replay_break, replay_delete_break qmp and hmp commands. These commands allow stopping at the specified instruction. It may be useful for debugging when there are some known events that should be investigated. replay_break command has one argument - number of instructions executed since the start of the replay. replay_delete_break removes previously set breakpoint. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Acked-by: Markus Armbruster <armbru@redhat.com> -- v4 changes: - removed useless error_free call Message-Id: <160174520606.12451.7056879546045599378.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: introduce info hmp/qmp commandPavel Dovgalyuk2020-10-062-0/+44
| | | | | | | | | | | | | | | This patch introduces 'info replay' monitor command and corresponding qmp request. These commands request the current record/replay mode, replay log file name, and the instruction count (number of recorded/replayed instructions). The instruction count can be used with the replay_seek/replay_break commands added in the next two patches. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> Message-Id: <160174520026.12451.13112161947433306561.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: provide an accessor for rr filenamePavel Dovgalyuk2020-10-061-0/+5
| | | | | | | | | | | | This patch adds an accessor function for the name of the record/replay log file. Adding an accessor instead of making variable global, prevents accidental modification of this variable by other modules. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <160174517710.12451.17645787545733927488.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* icount: rename functions to be consistent with the module nameClaudio Fontana2020-10-051-1/+1
| | | | | | | Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* cpu-timers, icount: new modulesClaudio Fontana2020-10-051-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | refactoring of cpus.c continues with cpu timer state extraction. cpu-timers: responsible for the softmmu cpu timers state, including cpu clocks and ticks. icount: counts the TCG instructions executed. As such it is specific to the TCG accelerator. Therefore, it is built only under CONFIG_TCG. One complication is due to qtest, which uses an icount field to warp time as part of qtest (qtest_clock_warp). In order to solve this problem, provide a separate counter for qtest. This requires fixing assumptions scattered in the code that qtest_enabled() implies icount_enabled(), checking each specific case. Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> [remove redundant initialization with qemu_spice_init] Reviewed-by: Alex Bennée <alex.bennee@linaro.org> [fix lingering calls to icount_get] Signed-off-by: Claudio Fontana <cfontana@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* meson: convert replay directory to MesonMarc-André Lureau2020-08-212-10/+12
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: synchronize on every virtual timer callbackPavel Dovgalyuk2020-06-261-1/+1
| | | | | | | | | | | | | | | | | | | | | Sometimes virtual timer callbacks depend on order of virtual timer processing and warping of virtual clock. Therefore every callback should be logged to make replay deterministic. This patch creates a checkpoint before every virtual timer callback. With these checkpoints virtual timers processing and clock warping events order is completely deterministic. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Acked-by: Alex Bennée <alex.bennee@linaro.org> -- v2: - remove mutex lock/unlock for virtual clock checkpoint since it is not process any asynchronous events (commit ca9759c2a92f528f256fef0e3922416f7bb47bf9) - bump record/replay log file version Message-Id: <159012932716.27256.8854065545365559921.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: fix replay shutdown for console modePavel Dovgalyuk2020-06-121-0/+5
| | | | | | | | | | | | | | When QEMU is used without any graphical window, QEMU execution is terminated with the signal (e.g., Ctrl-C). Signal processing in QEMU does not include qemu_system_shutdown_request call. That is why shutdown event is not recorded by record/replay in this case. This patch adds shutdown event to the end of the record log. Now every replay will shutdown the machine at the end. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <159012995470.27967.18129611453659045726.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: implement fair mutexPavel Dovgalyuk2020-06-101-1/+14
| | | | | | | | | | | | | | | | | In record/replay icount mode main loop thread and vCPU thread do not perform simultaneously. They take replay mutex to synchronize the actions. Sometimes vCPU thread waits for locking the mutex for very long time, because main loop releases the mutex and takes it back again. Standard qemu mutex do not provide the ordering capabilities. This patch adds a "queue" for replay mutex. Therefore thread ordering becomes more "fair". Threads are executed in the same order as they are trying to take the mutex. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <158823802979.28101.9340462887738957616.stgit@pasha-ThinkPad-X280> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: record and replay random number sourcesPavel Dovgalyuk2020-01-074-2/+49
| | | | | | | | | | | | Record/replay feature of icount allows deterministic running of execution scenarios. Some CPUs and peripheral devices read random numbers from external sources making deterministic execution impossible. This patch adds recording and replaying of random read operations into guest-random module, which is used by the virtual hardware. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <157675984852.14505.15709141760677102489.stgit@pasha-Precision-3630-Tower> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: add BH oneshot event for block layerPavel Dovgalyuk2019-10-142-0/+17
| | | | | | | | | | | | Replay is capable of recording normal BH events, but sometimes there are single use callbacks scheduled with aio_bh_schedule_oneshot function. This patch enables recording and replaying such callbacks. Block layer uses these events for calling the completion function. Replaying these calls makes the execution deterministic. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Acked-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* replay: finish record/replay before closing the disksPavel Dovgalyuk2019-10-141-0/+2
| | | | | | | | | After recent updates block devices cannot be closed on qemu exit. This happens due to the block request polling when replay is not finished. Therefore now we stop execution recording before closing the block devices. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
* Merge remote-tracking branch ↵Peter Maydell2019-08-212-9/+9
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'remotes/kraxel/tags/audio-20190821-pull-request' into staging audio: second batch of -audiodev support, adding support for multiple backends. # gpg: Signature made Wed 21 Aug 2019 09:40:37 BST # gpg: using RSA key 4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full] # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" [full] # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full] # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/audio-20190821-pull-request: audio: fix memory leak reported by ASAN audio: use size_t where makes sense audio: remove read and write pcm_ops paaudio: fix playback glitches audio: do not run each backend in audio_run audio: remove audio_MIN, audio_MAX paaudio: properly disconnect streams in fini_* paaudio: do not move stream when sink/source name is specified audio: audiodev= parameters no longer optional when -audiodev present paaudio: prepare for multiple audiodev audio: add audiodev properties to frontends audio: add audiodev property to vnc and wav_capture audio: basic support for multi backend audio audio: reduce glob_audio_state usage audio: Add missing fall through comments Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| * audio: use size_t where makes senseKővágó, Zoltán2019-08-212-9/+9
| | | | | | | | | | | | Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com> Message-id: c5193e687fc6cc0f60cb3e90fe69ddf2027d0df1.1566168923.git.DirtY.iCE.hu@gmail.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
* | replay: rename step-related variables and functionsPavel Dovgalyuk2019-08-206-26/+26
| | | | | | | | | | | | | | | | | | | | This patch renames replay_get_current_step() and related variables to make these names consistent with existing 'icount' command line option and future record/replay hmp/qmp commands. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <156404428377.18669.15476429889039912070.stgit@pasha-Precision-3630-Tower> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | replay: refine replay-time modulePavel Dovgalyuk2019-08-201-20/+16Star
| | | | | | | | | | | | | | | | This patch removes refactoring artifacts from the replay/replay-time.c Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <156404427799.18669.8072341590511911277.stgit@pasha-Precision-3630-Tower> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | replay: fix replay shutdownPavel Dovgalyuk2019-08-201-4/+4
| | | | | | | | | | | | | | | | | | | | | | This patch fixes shutdown of the replay process, which is terminated with the assert when shutdown event is read from the log. replay_finish_event reads new data_kind and therefore the value of data_kind should be preserved to be valid at qemu_system_shutdown_request call. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <156404427238.18669.12378772823692338069.stgit@pasha-Precision-3630-Tower> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | replay: add missing fix for internal functionPavel Dovgalyuk2019-08-201-1/+1
| | | | | | | | | | | | | | | | | | | | This is a fix which was missed by patch 74c0b816adfc6aa1b01b4426fdf385e32e35cbac, which added current_step parameter to the replay_advance_current_step function. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <156404425561.18669.13015037579222450241.stgit@pasha-Precision-3630-Tower> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | replay: Remove host_clock_lastDr. David Alan Gilbert2019-08-201-5/+2Star
|/ | | | | | | | | | | | Now we're not using the 'last' field in the timer, remove it from replay. Bump the version number of the replay structure since we've removed the field. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20190724115823.4199-4-dgilbert@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* sysemu: Split sysemu/runstate.h off sysemu/sysemu.hMarkus Armbruster2019-08-162-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | sysemu/sysemu.h is a rather unfocused dumping ground for stuff related to the system-emulator. Evidence: * It's included widely: in my "build everything" tree, changing sysemu/sysemu.h still triggers a recompile of some 1100 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h, down from 5400 due to the previous two commits). * It pulls in more than a dozen additional headers. Split stuff related to run state management into its own header sysemu/runstate.h. Touching sysemu/sysemu.h now recompiles some 850 objects. qemu/uuid.h also drops from 1100 to 850, and qapi/qapi-types-run-state.h from 4400 to 4200. Touching new sysemu/runstate.h recompiles some 500 objects. Since I'm touching MAINTAINERS to add sysemu/runstate.h anyway, also add qemu/main-loop.h. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190812052359.30071-30-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> [Unbreak OS-X build]
* Clean up inclusion of sysemu/sysemu.hMarkus Armbruster2019-08-164-4/+0Star
| | | | | | | | | | | | | | | | | | | | | | In my "build everything" tree, changing sysemu/sysemu.h triggers a recompile of some 5400 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). Almost a third of its inclusions are actually superfluous. Delete them. Downgrade two more to qapi/qapi-types-run-state.h, and move one from char/serial.h to char/serial.c. hw/semihosting/config.c, monitor/monitor.c, qdev-monitor.c, and stubs/semihost.c define variables declared in sysemu/sysemu.h without including it. The compiler is cool with that, but include it anyway. This doesn't reduce actual use much, as it's still included into widely included headers. The next commit will tackle that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190812052359.30071-27-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
* Include qemu/main-loop.h lessMarkus Armbruster2019-08-161-0/+1
| | | | | | | | | | | | | | | | | | | | In my "build everything" tree, changing qemu/main-loop.h triggers a recompile of some 5600 out of 6600 objects (not counting tests and objects that don't depend on qemu/osdep.h). It includes block/aio.h, which in turn includes qemu/event_notifier.h, qemu/notify.h, qemu/processor.h, qemu/qsp.h, qemu/queue.h, qemu/thread-posix.h, qemu/thread.h, qemu/timer.h, and a few more. Include qemu/main-loop.h only where it's needed. Touching it now recompiles only some 1700 objects. For block/aio.h and qemu/event_notifier.h, these numbers drop from 5600 to 2800. For the others, they shrink only slightly. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190812052359.30071-21-armbru@redhat.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
* Include qemu-common.h exactly where neededMarkus Armbruster2019-06-125-5/+0Star
| | | | | | | | | | | | | | | | 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]
* replay: Exit on errors reading from replay logPeter Maydell2018-11-081-3/+13
| | | | | | | | | | | | | | Currently replay_get_byte() does not check for an error from getc(). Coverity points out (CID 1390622) that this could result in unexpected behaviour (such as looping forever, if we use the replay_get_dword() return value for a loop count). We don't expect reads from the replay log to fail, and if they do there is no way we can continue. So make them fatal errors. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-id: 20181106153330.5139-1-peter.maydell@linaro.org
* replay: pass raw icount value to replay_save_clockPaolo Bonzini2018-10-193-13/+22
| | | | | | | This avoids lock recursion when REPLAY_CLOCK is called inside the timers spinlock. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: don't process events at virtual clock checkpointPavel Dovgalyuk2018-10-192-1/+9
| | | | | | | | | | | | | | As QEMU becomes more multi-threaded and non-synchronized, checkpoints move from thread to thread. And the event queue that processed at checkpoints should belong to the same thread in both record and replay executions. This patch disables asynchronous event processing at virtual clock checkpoint, because it may be invoked in different threads at record and replay. This patch is temporary fix until the checkpoints are completely refactored. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <20181018063345.7433.11678.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: allow loading any snapshots before recordingPavel Dovgalyuk2018-10-021-5/+12
| | | | | | | | | | | This patch enables using -loadvm in recording mode to allow starting the execution recording from any of the available snapshots. It also fixes loading of the record/replay state, therefore snapshots created in replay mode may also be used for starting the new recording. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <20180912081939.3228.56131.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: flush events when exitingPavel Dovgalyuk2018-10-022-15/+1Star
| | | | | | | | | | | This patch adds events processing when emulation finishes instead of just cleaning the queue. Now the bdrv coroutines will be in consistent state when emulator closes. It allows correct polling of the block layer at exit. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <20180912081859.3228.79735.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: wake up vCPU when replayingPavel Dovgalyuk2018-10-021-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In record/replay icount mode vCPU thread and iothread synchronize the execution using the checkpoints. vCPU thread processes the virtual timers and iothread processes all others. When iothread wants to wake up sleeping vCPU thread, it sends dummy queued work. Therefore it could be the following sequence of the events in record mode: - IO: sending dummy work - IO: processing timers - CPU: wakeup - CPU: clearing dummy work - CPU: processing virtual timers But due to the races in replay mode the sequence may change: - IO: sending dummy work - CPU: wakeup - CPU: clearing dummy work - CPU: sleeping again because nothing to do - IO: Processing timers - CPU: zzzz In this case vCPU will not wake up, because dummy work is not to be set up again. This patch tries to wake up the vCPU when it sleeps and the icount warp checkpoint isn't met. It means that vCPU has something to do, because there are no other reasons of non-matching warp checkpoint. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> -- v5: improve checking that vCPU is still sleeping Message-Id: <20180912081945.3228.19776.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* trivial: Make bios files and source files non-executableThomas Huth2018-09-251-0/+0
| | | | | | | | These files can not be executed on the host, so they should not be marked as executable. Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
* replay: save vmstate of the asynchronous eventsPavel Dovgalyuk2018-03-123-23/+30
| | | | | | | | | | | | | This patch fixes saving and loading the snapshots in the replay mode. It is required for the snapshots created in the moment when the header of the asynchronous event is read. This information was not saved in the snapshot. After loading the vmstate replay continued with the file offset passed the event header. The event header is lost in this case and replay hangs. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Message-Id: <20180227095322.1060.53929.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: don't process async events when warping the clockPavel Dovgalyuk2018-03-122-1/+7
| | | | | | | | | | | | | | Virtual clock is warped from iothread and vcpu thread. When the hardware events associated with warp checkpoint, then interrupt delivering may be non-deterministic if checkpoint is processed in different threads in record and replay. This patch disables event processing for clock warp checkpoint and leaves all hardware events to other checkpoints (e.g., virtual clock). Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095316.1060.4134.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: avoid recursive call of checkpointsPavel Dovgalyuk2018-03-121-1/+13
| | | | | | | | | | | | This patch adds a flag which denies recursive call of replay_checkpoint function. Checkpoints may be accompanied by the hardware events. When event is processed, virtual device may invoke timer modification functions that also invoke the checkpoint function. This leads to infinite loop. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095305.1060.56463.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: check return values of fwritePavel Dovgalyuk2018-03-121-2/+15
| | | | | | | | | | This patch adds error reporting when fwrite cannot completely save the buffer to the file. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095259.1060.86410.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: push replay_mutex_lock up the call treeAlex Bennée2018-03-126-70/+53Star
| | | | | | | | | | | | | | | | | | | | Now instead of using the replay_lock to guard the output of the log we now use it to protect the whole execution section. This replaces what the BQL used to do when it was held during TCG execution. We also introduce some rules for locking order - mainly that you cannot take the replay_mutex while holding the BQL. This leads to some slight sophistry during start-up and extending the replay_mutex_destroy function to unlock the mutex without checking for the BQL condition so it can be cleanly dropped in the non-replay case. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Tested-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095248.1060.40374.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
* replay: don't destroy mutex at exitPavel Dovgalyuk2018-03-123-7/+0Star
| | | | | | | | | | | Replay mutex is held by vCPU thread and destroy function is called from atexit of the main thread. Therefore we cannot destroy it safely. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095254.1060.96971.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: make locking visible outside replay codeAlex Bennée2018-03-122-4/+4
| | | | | | | | | | | | The replay_mutex_lock/unlock/locked functions are now going to be used for ensuring lock-step behaviour between the two threads. Make them public API functions and also provide stubs for non-QEMU builds on common paths. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095242.1060.16601.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay/replay-internal.c: track holding of replay_lockAlex Bennée2018-03-121-0/+11
| | | | | | | | | | | This is modelled after the iothread mutex lock. We keep a TLS flag to indicate when that thread has acquired the lock and assert we don't double-lock or release when we shouldn't have. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095237.1060.44661.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay/replay.c: bump REPLAY_VERSION againAlex Bennée2018-03-122-2/+2
| | | | | | | | | | | | This time commit 802f045a5f61b781df55e4492d896b4d20503ba7 broke the replay file format. Also add a comment about this to replay-internal.h. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095231.1060.91180.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* replay: save prior value of the host clockPavel Dovgalyuk2018-03-122-0/+5
| | | | | | | | | | | | This patch adds saving/restoring of the host clock field 'last'. It is used in host clock calculation and therefore clock may become incorrect when using restored vmstate. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095226.1060.50975.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: fix save/load vm for non-empty queuePavel Dovgalyuk2018-03-121-0/+6
| | | | | | | | | | | | | This patch does not allows saving/loading vmstate when replay events queue is not empty. There is no reliable way to save events queue, because it describes internal coroutine state. Therefore saving and loading operations should be deferred to another record/replay step. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095214.1060.32939.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: fixed replay_enable_eventsPavel Dovgalyuk2018-03-121-3/+5
| | | | | | | | | | | | This patch fixes assignment to internal events_enabled variable. Now it is set only in record/replay mode. This affects the behavior of the external functions that check this flag. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095209.1060.45884.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
* replay: fix processing async eventsPavel Dovgalyuk2018-03-121-2/+2
| | | | | | | | | | | | | Asynchronous events saved at checkpoints may invoke callbacks when processed. These callbacks may also generate/read new events (e.g. clock reads). Therefore event processing flag must be reset before callback invocation. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095203.1060.70831.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-12-18 09:57:36 +0100