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2018-03-12Merge remote-tracking branch 'remotes/kraxel/tags/vga-20180312-pull-request' ↵Peter Maydell
into staging 7cdc61becd vga: fix region calculation # gpg: Signature made Mon 12 Mar 2018 10:59:24 GMT # gpg: using RSA key 4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/vga-20180312-pull-request: vga: fix region calculation Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-03-13tests: make docker-test-debug@fedora run sanitizersMarc-André Lureau
Since --enable-debug no longer enable sanitizers, we need explicit --enable-sanitizers. llvm package is required for llvm-symbolizer, to get symbols in backtraces. Add make V=1 to get details about failing tests. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180312120849.20073-1-marcandre.lureau@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com>
2018-03-12Merge remote-tracking branch ↵Peter Maydell
'remotes/kraxel/tags/audio-20180312-pull-request' into staging modules: use gmodule-export. audio: add driver registry, enable module builds. # gpg: Signature made Mon 12 Mar 2018 10:42:19 GMT # gpg: using RSA key 4CB6D8EED3E87138 # gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" # gpg: aka "Gerd Hoffmann <gerd@kraxel.org>" # gpg: aka "Gerd Hoffmann (private) <kraxel@gmail.com>" # Primary key fingerprint: A032 8CFF B93A 17A7 9901 FE7D 4CB6 D8EE D3E8 7138 * remotes/kraxel/tags/audio-20180312-pull-request: audio/sdl: build as module audio/pulseaudio: build as module audio/oss: build as module audio/alsa: build as module build: enable audio modules audio: add module loading support audio: add driver registry modules: use gmodule-export Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-03-12tcg: fix cpu_io_recompilePavel Dovgalyuk
cpu_io_recompile() function was broken by the commit 9b990ee5a3cc6aa38f81266fb0c6ef37a36c45b9. Instead of regenerating the block starting from PC of the original block, it just set the instruction counter for TCG. In most cases this was unnoticed, but in icount mode there was an exception for incorrect usage of CF_LAST_IO flag. This patch recovers recompilation of the original block and also configures translation for executing single IO instruction which caused a recompilation. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095338.1060.27385.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
2018-03-12replay: update documentationPavel Dovgalyuk
This patch clarifies the description of the record/replay feature in docs/replay.txt Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20180227095333.1060.1331.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
2018-03-12replay: save vmstate of the asynchronous eventsPavel Dovgalyuk
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>
2018-03-12replay: don't process async events when warping the clockPavel Dovgalyuk
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>
2018-03-12scripts/replay-dump.py: replay log dumperAlex Bennée
This script is a debugging tool for looking through the contents of a replay log file. It is incomplete but should fail gracefully at events it doesn't understand. It currently understands two different log formats as the audio record/replay support was merged during since MTTCG. It was written to help debug what has caused the BQL changes to break replay support. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20180227095310.1060.14500.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12replay: avoid recursive call of checkpointsPavel Dovgalyuk
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>
2018-03-12replay: check return values of fwritePavel Dovgalyuk
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>
2018-03-12replay: push replay_mutex_lock up the call treeAlex Bennée
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>
2018-03-12replay: don't destroy mutex at exitPavel Dovgalyuk
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>
2018-03-12replay: make locking visible outside replay codeAlex Bennée
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>
2018-03-12replay/replay-internal.c: track holding of replay_lockAlex Bennée
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>
2018-03-12replay/replay.c: bump REPLAY_VERSION againAlex Bennée
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>
2018-03-12replay: save prior value of the host clockPavel Dovgalyuk
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>
2018-03-12replay: added replay log format descriptionPavel Dovgalyuk
This patch adds description of the replay log file format into the docs/replay.txt. Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095220.1060.58759.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12replay: fix save/load vm for non-empty queuePavel Dovgalyuk
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>
2018-03-12replay: fixed replay_enable_eventsPavel Dovgalyuk
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>
2018-03-12replay: fix processing async eventsPavel Dovgalyuk
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>
2018-03-12cpu-exec: fix exception_index handlingPavel Dovgalyuk
Function cpu_handle_interrupt calls cc->cpu_exec_interrupt to process pending hardware interrupts. Under the hood cpu_exec_interrupt uses cpu->exception_index to pass information to the internal function which is usually common for exception and interrupt processing. But this value is not reset after return and may be processed again by cpu_handle_exception. This does not happen due to overwriting the exception_index at the end of cpu_handle_interrupt. But this branch may also overwrite the valid exception_index in some cases. Therefore this patch: 1. resets exception_index just after the call to cpu_exec_interrupt 2. prevents overwriting the meaningful value of exception_index Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20180227095140.1060.61357.stgit@pasha-VirtualBox> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
2018-03-12hw/i386/pc: Factor out the superio codePhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-26-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/alpha/dp264: Use the TYPE_SMC37C669_SUPERIOPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-25-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/alpha/dp264: Add the ISA DMA controllerPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-24-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Add the SMC FDC37C669 Super I/OPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-23-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12MAINTAINERS: Split the Alpha TCG/machine sectionPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-22-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12MAINTAINERS: Add entries for the VT82C686B Super I/OPhilippe Mathieu-Daudé
So far, it is only used by the MIPS Fulong 2E mini PC. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-21-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/vt82c686: Add the TYPE_VT82C686B_SUPERIOPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-20-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/vt82c686: Rename vt82c686b_init() -> vt82c686b_isa_init()Philippe Mathieu-Daudé
This function only initialize the ISA bus. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-19-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/mips/mips_fulong2e: Factor out vt82c686b_southbridge_init()Philippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-18-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Factor out the FDC37M817 Super I/O from mips_malta.cPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-17-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/mips/malta: Code movementPhilippe Mathieu-Daudé
Move the SouthBridge peripherals first, and keep the Super I/O peripherals last. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-16-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Factor out the IDE code from pc87312.cPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-15-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Add a keyboard/mouse controller (8042)Philippe Mathieu-Daudé
Since the PC87312 inherits this abstract model, we remove the I8042 instance in the PREP machine. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: David Gibson <david@gibson.dropbear.id.au> Message-Id: <20180308223946.26784-14-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Factor out the floppy disc controller code from pc87312.cPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-13-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Factor out the serial code from pc87312.cPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-12-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Factor out the parallel code from pc87312.cPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-11-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/pc87312: Inherit from the abstract TYPE_ISA_SUPERIOPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-10-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/superio: Add a Super I/O template based on the PC87312 devicePhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-9-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/pc87312: Use 'unsigned int' for the irq valuePhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-8-f4bug@amsat.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/pc87312: Use uint16_t for the ISA I/O base addressPhilippe Mathieu-Daudé
This matches the isa_register_ioport() prototype. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-7-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa/pc87312: Rename the device type as TYPE_PC87312_SUPERIOPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: David Gibson <david@gibson.dropbear.id.au> (hw/ppc) Message-Id: <20180308223946.26784-6-f4bug@amsat.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12MAINTAINERS: Fix the PC87312 include pathPhilippe Mathieu-Daudé
Missed while moving it in 0d09e41a51aa. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-5-f4bug@amsat.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/input/i8042: Extract declarations from i386/pc.h into input/i8042.hPhilippe Mathieu-Daudé
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Acked-by: David Gibson <david@gibson.dropbear.id.au> (hw/ppc) Message-Id: <20180308223946.26784-4-f4bug@amsat.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/dma/i8257: Rename DMA_init() to i8257_dma_init()Philippe Mathieu-Daudé
- Move the header from hw/isa/ to hw/dma/ - Remove the old i386/pc dependency - use a bool type for the high_page_enable argument Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-3-f4bug@amsat.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12hw/isa: Move parallel_hds_isa_init() to hw/char/parallel-isa.cPhilippe Mathieu-Daudé
Again... (after 07dc788054d7 and 9157eee1b1c0). We now extract the ISA bus specific helpers. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180308223946.26784-2-f4bug@amsat.org> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12membarrier: add --enable-membarrierPaolo Bonzini
Actually enable the global memory barriers if supported by the OS. Because only recent versions of Linux include the support, they are disabled by default. Note that it also has to be disabled for QEMU to run under Wine. Before this patch, rcutorture reports 85 ns/read for my machine, after the patch it reports 12.5 ns/read. On the other hand updates go from 50 *micro*seconds to 20 *milli*seconds. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12membarrier: introduce qemu/sys_membarrier.hPaolo Bonzini
This new header file provides heavy-weight "global" memory barriers that enforce memory ordering on each running thread belonging to the current process. For now, use a dummy implementation that issues memory barriers on both sides (matching what QEMU has been doing so far). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12rcu: make memory barriers more explicitPaolo Bonzini
Prepare for introducing smp_mb_placeholder() and smp_mb_global(). The new smp_mb() in synchronize_rcu() is not strictly necessary, since the first atomic_mb_set for rcu_gp_ctr provides the required ordering. However, synchronize_rcu is not performance critical, and it *will* be necessary to introduce a smp_mb_global before calling wait_for_readers(). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-03-12docs: document atomic_load_acquire and atomic_store_releasePaolo Bonzini
We will use them in the next patch, document what they do. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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