Greg Kurz ef149763a8 rcu: Introduce force_rcu notifier ... The drain_rcu_call() function can be blocked as long as an RCU reader stays in a read-side critical section. This is typically what happens when a TCG vCPU is executing a busy loop. It can deadlock the QEMU monitor as reported in https://gitlab.com/qemu-project/qemu/-/issues/650 . This can be avoided by allowing drain_rcu_call() to enforce an RCU grace period. Since each reader might need to do specific actions to end a read-side critical section, do it with notifiers. Prepare ground for this by adding a notifier list to the RCU reader struct and use it in wait_for_readers() if drain_rcu_call() is in progress. An API is added for readers to register their notifiers. This is largely based on a draft from Paolo Bonzini. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20211109183523.47726-2-groug@kaod.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2021-11-10 13:20:15 +01:00
..
aio-posix.c	iothread: add aio-max-batch parameter	2021-07-21 13:47:50 +01:00
aio-posix.h
aio-wait.c
aio-win32.c	iothread: add aio-max-batch parameter	2021-07-21 13:47:50 +01:00
aiocb.c
async.c	iothread: add aio-max-batch parameter	2021-07-21 13:47:50 +01:00
atomic64.c
base64.c
bitmap.c
bitops.c
block-helpers.c
block-helpers.h
buffer.c
bufferiszero.c
cacheflush.c	util/cacheflush: Fix error generated by clang	2021-01-21 13:00:41 +01:00
cacheinfo.c	util: Enhance flush_icache_range with separate data pointer	2021-01-07 05:09:41 -10:00
compatfd.c	util/compatfd.c: use libc signalfd wrapper instead of raw syscall	2021-10-13 10:47:49 +02:00
coroutine-sigaltstack.c	coroutine-sigaltstack: Add SIGUSR2 mutex	2021-01-26 14:36:37 +01:00
coroutine-ucontext.c
coroutine-win32.c
crc32c.c
crc-ccitt.c	util: Add CRC16 (CCITT) calculation routines	2021-01-24 20:10:54 +01:00
cutils.c	cutils: fix memory leak in get_relocated_path()	2021-05-13 18:06:40 +02:00
dbus.c
drm.c
envlist.c
error.c
event_notifier-posix.c	event_notifier: Set ->initialized earlier in event_notifier_init()	2021-02-16 17:15:39 +01:00
event_notifier-win32.c
fdmon-epoll.c
fdmon-io_uring.c
fdmon-poll.c
fifo8.c	utils/fifo8: change fatal errors from abort() to assert()	2021-02-07 20:38:20 +00:00
filemonitor-inotify.c
filemonitor-stub.c
getauxval.c
guest-random.c	util/guest-random: Fix size arg to tail memcpy	2021-07-09 18:42:46 +02:00
hbitmap.c
hexdump.c
host-utils.c	host-utils: add 128-bit quotient support to divu128/divs128	2021-10-27 17:10:00 -07:00
id.c	net: Use id_generate() in the network subsystem, too	2021-03-09 21:47:45 +01:00
iov.c	util/iov: make qemu_iovec_init_extended() honest	2021-02-03 08:00:33 -06:00
iova-tree.c	util: Make some iova_tree parameters const	2021-11-02 15:57:21 +01:00
keyval.c	keyval: introduce keyval_parse_into	2021-07-06 08:33:51 +02:00
lockcnt.c
log.c
main-loop.c	util/async: add a human-readable name to BHs for debugging	2021-07-05 11:40:32 +01:00
memfd.c
meson.build	configure, meson: move more compiler checks to Meson	2021-10-14 09:50:57 +02:00
mmap-alloc.c	Deprecate pmem=on with non-DAX capable backend file	2021-07-06 18:05:16 -04:00
module.c	modules: check arch on qom lookup	2021-07-09 18:20:27 +02:00
notify.c
nvdimm-utils.c
osdep.c	util/osdep: Add qemu_mprotect_rw	2021-06-13 17:42:40 -07:00
oslib-posix.c	memory: Introduce RAM_NORESERVE and wire it up in qemu_ram_mmap()	2021-06-15 20:27:38 +02:00
oslib-win32.c	util/oslib-win32: Fix fatal assertion in qemu_try_memalign	2021-06-19 14:51:51 -07:00
pagesize.c
path.c
qdist.c
qemu-co-shared-resource.c	co-shared-resource: protect with a mutex	2021-06-25 14:24:24 +03:00
qemu-config.c	qemu-config: restore "machine" in qmp_query_command_line_options()	2021-07-22 14:44:47 +02:00
qemu-coroutine-io.c
qemu-coroutine-lock.c	coroutine-lock: Reimplement CoRwlock to fix downgrade bug	2021-03-31 10:44:21 +01:00
qemu-coroutine-sleep.c	coroutine-sleep: introduce qemu_co_sleep	2021-05-21 18:22:33 +01:00
qemu-coroutine.c
qemu-error.c	error: rename error_with_timestamp to message_with_timestamp	2021-02-01 10:50:55 +00:00
qemu-openpty.c	util: Remove redundant checks in the openpty()	2021-09-15 14:42:48 +02:00
qemu-option.c	qemu-option: Allow deleting opts during qemu_opts_foreach()	2021-10-15 16:11:22 +02:00
qemu-print.c
qemu-progress.c
qemu-sockets.c	build-sys: add HAVE_IPPROTO_MPTCP	2021-09-30 15:30:25 +02:00
qemu-thread-common.h
qemu-thread-posix.c	configure, meson: move pthread_setname_np checks to Meson	2021-10-14 09:50:57 +02:00
qemu-thread-win32.c	util: Pass file+line to qemu_rec_mutex_unlock_impl	2021-06-16 15:03:26 +02:00
qemu-timer-common.c	semihosting: Implement SYS_ELAPSED and SYS_TICKFREQ	2021-01-18 10:05:06 +00:00
qemu-timer.c	spapr: rollback 'unplug timeout' for CPU hotunplugs	2021-04-12 12:27:14 +10:00
qht.c
qsp.c	qemu/atomic: Add aligned_{int64,uint64}_t types	2021-07-21 07:45:38 -10:00
range.c
rcu.c	rcu: Introduce force_rcu notifier	2021-11-10 13:20:15 +01:00
readline.c
selfmap.c	util/selfmap: Discard mapping on error	2021-07-26 07:06:49 -10:00
stats64.c
sys_membarrier.c
systemd.c
thread-pool.c
throttle.c	Remove superfluous timer_del() calls	2021-01-08 15:13:38 +00:00
timed-average.c
trace-events	modules: add tracepoints	2021-07-09 18:20:27 +02:00
trace.h
transactions.c	util: add transactions.c	2021-04-30 12:27:47 +02:00
unicode.c
uri.c	util/uri: do not check argument of uri_free()	2021-07-09 12:26:05 +02:00
userfaultfd.c	migration: introduce UFFD-WP low-level interface helpers	2021-02-08 11:19:51 +00:00
uuid.c
vfio-helpers.c	util/vfio-helpers: Let qemu_vfio_do_mapping() propagate Error	2021-09-07 09:08:24 +01:00
vhost-user-server.c
yank.c	yank: Remove dependency on qiochannel	2021-04-01 15:27:44 +04:00