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author | Peter Maydell <peter.maydell@linaro.org> | 2018-03-16 11:05:03 +0000 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2018-03-16 11:05:03 +0000 |
commit | 3788c7b6e56fa34ee2a73e41706eb2a2447ba75a (patch) | |
tree | 8f016e7c9175686b4d7c2d1847c8cc877102dc6b /util | |
parent | a57946ff2acb9c0d95c9f127914540586b0b8c21 (diff) | |
parent | 0790f86861079b1932679d0f011e431aaf4ee9e2 (diff) | |
download | qemu-3788c7b6e56fa34ee2a73e41706eb2a2447ba75a.zip qemu-3788c7b6e56fa34ee2a73e41706eb2a2447ba75a.tar.gz qemu-3788c7b6e56fa34ee2a73e41706eb2a2447ba75a.tar.bz2 |
Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging
* Record-replay lockstep execution, log dumper and fixes (Alex, Pavel)
* SCSI fix to pass maximum transfer size (Daniel Barboza)
* chardev fixes and improved iothread support (Daniel Berrangé, Peter)
* checkpatch tweak (Eric)
* make help tweak (Marc-André)
* make more PCI NICs available with -net or -nic (myself)
* change default q35 NIC to e1000e (myself)
* SCSI support for NDOB bit (myself)
* membarrier system call support (myself)
* SuperIO refactoring (Philippe)
* miscellaneous cleanups and fixes (Thomas)
# gpg: Signature made Mon 12 Mar 2018 16:10:52 GMT
# gpg: using RSA key BFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83
* remotes/bonzini/tags/for-upstream: (69 commits)
tcg: fix cpu_io_recompile
replay: update documentation
replay: save vmstate of the asynchronous events
replay: don't process async events when warping the clock
scripts/replay-dump.py: replay log dumper
replay: avoid recursive call of checkpoints
replay: check return values of fwrite
replay: push replay_mutex_lock up the call tree
replay: don't destroy mutex at exit
replay: make locking visible outside replay code
replay/replay-internal.c: track holding of replay_lock
replay/replay.c: bump REPLAY_VERSION again
replay: save prior value of the host clock
replay: added replay log format description
replay: fix save/load vm for non-empty queue
replay: fixed replay_enable_events
replay: fix processing async events
cpu-exec: fix exception_index handling
hw/i386/pc: Factor out the superio code
hw/alpha/dp264: Use the TYPE_SMC37C669_SUPERIO
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
# Conflicts:
# default-configs/i386-softmmu.mak
# default-configs/x86_64-softmmu.mak
Diffstat (limited to 'util')
-rw-r--r-- | util/Makefile.objs | 1 | ||||
-rw-r--r-- | util/main-loop.c | 15 | ||||
-rw-r--r-- | util/qemu-timer.c | 12 | ||||
-rw-r--r-- | util/rcu.c | 15 | ||||
-rw-r--r-- | util/sys_membarrier.c | 50 |
5 files changed, 85 insertions, 8 deletions
diff --git a/util/Makefile.objs b/util/Makefile.objs index ae90b99..728c354 100644 --- a/util/Makefile.objs +++ b/util/Makefile.objs @@ -33,6 +33,7 @@ util-obj-y += throttle.o util-obj-y += getauxval.o util-obj-y += readline.o util-obj-y += rcu.o +util-obj-$(CONFIG_MEMBARRIER) += sys_membarrier.o util-obj-y += qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o util-obj-y += qemu-coroutine-sleep.o util-obj-y += coroutine-$(CONFIG_COROUTINE_BACKEND).o diff --git a/util/main-loop.c b/util/main-loop.c index 7558eb5..992f9b0 100644 --- a/util/main-loop.c +++ b/util/main-loop.c @@ -29,6 +29,7 @@ #include "qemu/sockets.h" // struct in_addr needed for libslirp.h #include "sysemu/qtest.h" #include "sysemu/cpus.h" +#include "sysemu/replay.h" #include "slirp/libslirp.h" #include "qemu/main-loop.h" #include "block/aio.h" @@ -245,18 +246,19 @@ static int os_host_main_loop_wait(int64_t timeout) timeout = SCALE_MS; } + if (timeout) { spin_counter = 0; - qemu_mutex_unlock_iothread(); } else { spin_counter++; } + qemu_mutex_unlock_iothread(); + replay_mutex_unlock(); ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout); - if (timeout) { - qemu_mutex_lock_iothread(); - } + replay_mutex_lock(); + qemu_mutex_lock_iothread(); glib_pollfds_poll(); @@ -463,8 +465,13 @@ static int os_host_main_loop_wait(int64_t timeout) poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout); qemu_mutex_unlock_iothread(); + + replay_mutex_unlock(); + g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns); + replay_mutex_lock(); + qemu_mutex_lock_iothread(); if (g_poll_ret > 0) { for (i = 0; i < w->num; i++) { diff --git a/util/qemu-timer.c b/util/qemu-timer.c index 82d5650..2ed1bf2 100644 --- a/util/qemu-timer.c +++ b/util/qemu-timer.c @@ -622,6 +622,18 @@ int64_t qemu_clock_get_ns(QEMUClockType type) } } +uint64_t qemu_clock_get_last(QEMUClockType type) +{ + QEMUClock *clock = qemu_clock_ptr(type); + return clock->last; +} + +void qemu_clock_set_last(QEMUClockType type, uint64_t last) +{ + QEMUClock *clock = qemu_clock_ptr(type); + clock->last = last; +} + void qemu_clock_register_reset_notifier(QEMUClockType type, Notifier *notifier) { @@ -92,10 +92,11 @@ static void wait_for_readers(void) atomic_set(&index->waiting, true); } - /* Here, order the stores to index->waiting before the - * loads of index->ctr. + /* Here, order the stores to index->waiting before the loads of + * index->ctr. Pairs with smp_mb_placeholder() in rcu_read_unlock(), + * ensuring that the loads of index->ctr are sequentially consistent. */ - smp_mb(); + smp_mb_global(); QLIST_FOREACH_SAFE(index, ®istry, node, tmp) { if (!rcu_gp_ongoing(&index->ctr)) { @@ -142,8 +143,13 @@ static void wait_for_readers(void) void synchronize_rcu(void) { qemu_mutex_lock(&rcu_sync_lock); - qemu_mutex_lock(&rcu_registry_lock); + /* Write RCU-protected pointers before reading p_rcu_reader->ctr. + * Pairs with smp_mb_placeholder() in rcu_read_lock(). + */ + smp_mb_global(); + + qemu_mutex_lock(&rcu_registry_lock); if (!QLIST_EMPTY(®istry)) { /* In either case, the atomic_mb_set below blocks stores that free * old RCU-protected pointers. @@ -370,6 +376,7 @@ static void rcu_init_child(void) static void __attribute__((__constructor__)) rcu_init(void) { + smp_mb_global_init(); #ifdef CONFIG_POSIX pthread_atfork(rcu_init_lock, rcu_init_unlock, rcu_init_child); #endif diff --git a/util/sys_membarrier.c b/util/sys_membarrier.c new file mode 100644 index 0000000..8dcb53e --- /dev/null +++ b/util/sys_membarrier.c @@ -0,0 +1,50 @@ +/* + * Process-global memory barriers + * + * Copyright (c) 2018 Red Hat, Inc. + * + * Author: Paolo Bonzini <pbonzini@redhat.com> + */ + +#include <qemu/osdep.h> +#include <qemu/sys_membarrier.h> +#include <qemu/error-report.h> + +#ifdef CONFIG_LINUX +#include <linux/membarrier.h> +#include <sys/syscall.h> + +static int +membarrier(int cmd, int flags) +{ + return syscall(__NR_membarrier, cmd, flags); +} +#endif + +void smp_mb_global(void) +{ +#if defined CONFIG_WIN32 + FlushProcessWriteBuffers(); +#elif defined CONFIG_LINUX + membarrier(MEMBARRIER_CMD_SHARED, 0); +#else +#error --enable-membarrier is not supported on this operating system. +#endif +} + +void smp_mb_global_init(void) +{ +#ifdef CONFIG_LINUX + int ret = membarrier(MEMBARRIER_CMD_QUERY, 0); + if (ret < 0) { + error_report("This QEMU binary requires the membarrier system call."); + error_report("Please upgrade your system to a newer version of Linux"); + exit(1); + } + if (!(ret & MEMBARRIER_CMD_SHARED)) { + error_report("This QEMU binary requires MEMBARRIER_CMD_SHARED support."); + error_report("Please upgrade your system to a newer version of Linux"); + exit(1); + } +#endif +} |