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![Stefan Hajnoczi](/assets/img/avatar_default.png)
The Big QEMU Lock (BQL) has many names and they are confusing. The actual QemuMutex variable is called qemu_global_mutex but it's commonly referred to as the BQL in discussions and some code comments. The locking APIs, however, are called qemu_mutex_lock_iothread() and qemu_mutex_unlock_iothread(). The "iothread" name is historic and comes from when the main thread was split into into KVM vcpu threads and the "iothread" (now called the main loop thread). I have contributed to the confusion myself by introducing a separate --object iothread, a separate concept unrelated to the BQL. The "iothread" name is no longer appropriate for the BQL. Rename the locking APIs to: - void bql_lock(void) - void bql_unlock(void) - bool bql_locked(void) There are more APIs with "iothread" in their names. Subsequent patches will rename them. There are also comments and documentation that will be updated in later patches. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paul Durrant <paul@xen.org> Acked-by: Fabiano Rosas <farosas@suse.de> Acked-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Cédric Le Goater <clg@kaod.org> Acked-by: Peter Xu <peterx@redhat.com> Acked-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com> Acked-by: Hyman Huang <yong.huang@smartx.com> Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com> Message-id: 20240102153529.486531-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
654 lines
17 KiB
C
654 lines
17 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/cutils.h"
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#include "qemu/timer.h"
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#include "sysemu/cpu-timers.h"
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#include "sysemu/replay.h"
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#include "qemu/main-loop.h"
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#include "block/aio.h"
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#include "block/thread-pool.h"
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#include "qemu/error-report.h"
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#include "qemu/queue.h"
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#include "qom/object.h"
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#ifndef _WIN32
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#include <sys/wait.h>
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#endif
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#ifndef _WIN32
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/* If we have signalfd, we mask out the signals we want to handle and then
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* use signalfd to listen for them. We rely on whatever the current signal
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* handler is to dispatch the signals when we receive them.
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*/
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/*
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* Disable CFI checks.
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* We are going to call a signal handler directly. Such handler may or may not
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* have been defined in our binary, so there's no guarantee that the pointer
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* used to set the handler is a cfi-valid pointer. Since the handlers are
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* stored in kernel memory, changing the handler to an attacker-defined
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* function requires being able to call a sigaction() syscall,
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* which is not as easy as overwriting a pointer in memory.
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*/
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QEMU_DISABLE_CFI
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static void sigfd_handler(void *opaque)
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{
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int fd = (intptr_t)opaque;
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struct qemu_signalfd_siginfo info;
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struct sigaction action;
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ssize_t len;
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while (1) {
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len = RETRY_ON_EINTR(read(fd, &info, sizeof(info)));
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if (len == -1 && errno == EAGAIN) {
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break;
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}
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if (len != sizeof(info)) {
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error_report("read from sigfd returned %zd: %s", len,
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g_strerror(errno));
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return;
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}
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sigaction(info.ssi_signo, NULL, &action);
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if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
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sigaction_invoke(&action, &info);
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} else if (action.sa_handler) {
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action.sa_handler(info.ssi_signo);
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}
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}
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}
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static int qemu_signal_init(Error **errp)
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{
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int sigfd;
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sigset_t set;
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/*
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* SIG_IPI must be blocked in the main thread and must not be caught
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* by sigwait() in the signal thread. Otherwise, the cpu thread will
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* not catch it reliably.
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*/
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sigemptyset(&set);
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sigaddset(&set, SIG_IPI);
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sigaddset(&set, SIGIO);
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sigaddset(&set, SIGALRM);
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sigaddset(&set, SIGBUS);
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/* SIGINT cannot be handled via signalfd, so that ^C can be used
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* to interrupt QEMU when it is being run under gdb. SIGHUP and
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* SIGTERM are also handled asynchronously, even though it is not
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* strictly necessary, because they use the same handler as SIGINT.
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*/
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pthread_sigmask(SIG_BLOCK, &set, NULL);
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sigdelset(&set, SIG_IPI);
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sigfd = qemu_signalfd(&set);
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if (sigfd == -1) {
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error_setg_errno(errp, errno, "failed to create signalfd");
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return -errno;
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}
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g_unix_set_fd_nonblocking(sigfd, true, NULL);
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qemu_set_fd_handler(sigfd, sigfd_handler, NULL, (void *)(intptr_t)sigfd);
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return 0;
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}
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#else /* _WIN32 */
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static int qemu_signal_init(Error **errp)
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{
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return 0;
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}
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#endif
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static AioContext *qemu_aio_context;
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static QEMUBH *qemu_notify_bh;
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static void notify_event_cb(void *opaque)
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{
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/* No need to do anything; this bottom half is only used to
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* kick the kernel out of ppoll/poll/WaitForMultipleObjects.
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*/
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}
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AioContext *qemu_get_aio_context(void)
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{
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return qemu_aio_context;
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}
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void qemu_notify_event(void)
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{
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if (!qemu_aio_context) {
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return;
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}
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qemu_bh_schedule(qemu_notify_bh);
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}
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static GArray *gpollfds;
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int qemu_init_main_loop(Error **errp)
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{
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int ret;
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GSource *src;
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init_clocks(qemu_timer_notify_cb);
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ret = qemu_signal_init(errp);
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if (ret) {
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return ret;
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}
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qemu_aio_context = aio_context_new(errp);
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if (!qemu_aio_context) {
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return -EMFILE;
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}
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qemu_set_current_aio_context(qemu_aio_context);
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qemu_notify_bh = qemu_bh_new(notify_event_cb, NULL);
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gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
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src = aio_get_g_source(qemu_aio_context);
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g_source_set_name(src, "aio-context");
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g_source_attach(src, NULL);
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g_source_unref(src);
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src = iohandler_get_g_source();
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g_source_set_name(src, "io-handler");
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g_source_attach(src, NULL);
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g_source_unref(src);
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return 0;
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}
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static void main_loop_update_params(EventLoopBase *base, Error **errp)
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{
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ERRP_GUARD();
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if (!qemu_aio_context) {
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error_setg(errp, "qemu aio context not ready");
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return;
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}
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aio_context_set_aio_params(qemu_aio_context, base->aio_max_batch);
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aio_context_set_thread_pool_params(qemu_aio_context, base->thread_pool_min,
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base->thread_pool_max, errp);
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}
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MainLoop *mloop;
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static void main_loop_init(EventLoopBase *base, Error **errp)
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{
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MainLoop *m = MAIN_LOOP(base);
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if (mloop) {
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error_setg(errp, "only one main-loop instance allowed");
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return;
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}
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main_loop_update_params(base, errp);
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mloop = m;
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return;
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}
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static bool main_loop_can_be_deleted(EventLoopBase *base)
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{
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return false;
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}
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static void main_loop_class_init(ObjectClass *oc, void *class_data)
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{
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EventLoopBaseClass *bc = EVENT_LOOP_BASE_CLASS(oc);
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bc->init = main_loop_init;
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bc->update_params = main_loop_update_params;
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bc->can_be_deleted = main_loop_can_be_deleted;
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}
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static const TypeInfo main_loop_info = {
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.name = TYPE_MAIN_LOOP,
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.parent = TYPE_EVENT_LOOP_BASE,
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.class_init = main_loop_class_init,
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.instance_size = sizeof(MainLoop),
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};
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static void main_loop_register_types(void)
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{
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type_register_static(&main_loop_info);
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}
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type_init(main_loop_register_types)
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static int max_priority;
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#ifndef _WIN32
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static int glib_pollfds_idx;
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static int glib_n_poll_fds;
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static void glib_pollfds_fill(int64_t *cur_timeout)
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{
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GMainContext *context = g_main_context_default();
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int timeout = 0;
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int64_t timeout_ns;
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int n;
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g_main_context_prepare(context, &max_priority);
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glib_pollfds_idx = gpollfds->len;
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n = glib_n_poll_fds;
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do {
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GPollFD *pfds;
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glib_n_poll_fds = n;
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g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds);
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pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
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n = g_main_context_query(context, max_priority, &timeout, pfds,
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glib_n_poll_fds);
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} while (n != glib_n_poll_fds);
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if (timeout < 0) {
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timeout_ns = -1;
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} else {
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timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS;
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}
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*cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_timeout);
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}
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static void glib_pollfds_poll(void)
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{
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GMainContext *context = g_main_context_default();
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GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
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if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) {
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g_main_context_dispatch(context);
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}
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}
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#define MAX_MAIN_LOOP_SPIN (1000)
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static int os_host_main_loop_wait(int64_t timeout)
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{
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GMainContext *context = g_main_context_default();
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int ret;
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g_main_context_acquire(context);
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glib_pollfds_fill(&timeout);
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bql_unlock();
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replay_mutex_unlock();
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ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout);
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replay_mutex_lock();
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bql_lock();
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glib_pollfds_poll();
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g_main_context_release(context);
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return ret;
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}
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#else
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/***********************************************************/
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/* Polling handling */
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typedef struct PollingEntry {
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PollingFunc *func;
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void *opaque;
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struct PollingEntry *next;
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} PollingEntry;
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static PollingEntry *first_polling_entry;
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int qemu_add_polling_cb(PollingFunc *func, void *opaque)
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{
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PollingEntry **ppe, *pe;
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pe = g_new0(PollingEntry, 1);
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pe->func = func;
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pe->opaque = opaque;
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for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
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*ppe = pe;
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return 0;
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}
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void qemu_del_polling_cb(PollingFunc *func, void *opaque)
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{
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PollingEntry **ppe, *pe;
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for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
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pe = *ppe;
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if (pe->func == func && pe->opaque == opaque) {
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*ppe = pe->next;
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g_free(pe);
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break;
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}
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}
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}
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/***********************************************************/
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/* Wait objects support */
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typedef struct WaitObjects {
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int num;
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int revents[MAXIMUM_WAIT_OBJECTS];
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HANDLE events[MAXIMUM_WAIT_OBJECTS];
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WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS];
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void *opaque[MAXIMUM_WAIT_OBJECTS];
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} WaitObjects;
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static WaitObjects wait_objects = {0};
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int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
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{
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int i;
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WaitObjects *w = &wait_objects;
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if (w->num >= MAXIMUM_WAIT_OBJECTS) {
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return -1;
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}
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for (i = 0; i < w->num; i++) {
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/* check if the same handle is added twice */
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if (w->events[i] == handle) {
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return -1;
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}
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}
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w->events[w->num] = handle;
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w->func[w->num] = func;
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w->opaque[w->num] = opaque;
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w->revents[w->num] = 0;
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w->num++;
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return 0;
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}
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void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
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{
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int i, found;
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WaitObjects *w = &wait_objects;
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found = 0;
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for (i = 0; i < w->num; i++) {
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if (w->events[i] == handle) {
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found = 1;
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}
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if (found && i < (MAXIMUM_WAIT_OBJECTS - 1)) {
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w->events[i] = w->events[i + 1];
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w->func[i] = w->func[i + 1];
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w->opaque[i] = w->opaque[i + 1];
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w->revents[i] = w->revents[i + 1];
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}
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}
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if (found) {
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w->num--;
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}
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}
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static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds,
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fd_set *xfds)
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{
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int nfds = -1;
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int i;
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for (i = 0; i < pollfds->len; i++) {
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GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
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int fd = pfd->fd;
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int events = pfd->events;
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if (events & G_IO_IN) {
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FD_SET(fd, rfds);
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nfds = MAX(nfds, fd);
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}
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if (events & G_IO_OUT) {
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FD_SET(fd, wfds);
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nfds = MAX(nfds, fd);
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}
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if (events & G_IO_PRI) {
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FD_SET(fd, xfds);
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nfds = MAX(nfds, fd);
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}
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}
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return nfds;
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}
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static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds,
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fd_set *wfds, fd_set *xfds)
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{
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int i;
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for (i = 0; i < pollfds->len; i++) {
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GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
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int fd = pfd->fd;
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int revents = 0;
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if (FD_ISSET(fd, rfds)) {
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revents |= G_IO_IN;
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}
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if (FD_ISSET(fd, wfds)) {
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revents |= G_IO_OUT;
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}
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if (FD_ISSET(fd, xfds)) {
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revents |= G_IO_PRI;
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}
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pfd->revents = revents & pfd->events;
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}
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}
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static int os_host_main_loop_wait(int64_t timeout)
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{
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GMainContext *context = g_main_context_default();
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GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
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int select_ret = 0;
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int g_poll_ret, ret, i, n_poll_fds;
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PollingEntry *pe;
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WaitObjects *w = &wait_objects;
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gint poll_timeout;
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int64_t poll_timeout_ns;
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static struct timeval tv0;
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fd_set rfds, wfds, xfds;
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int nfds;
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g_main_context_acquire(context);
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/* XXX: need to suppress polling by better using win32 events */
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ret = 0;
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for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
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ret |= pe->func(pe->opaque);
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}
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if (ret != 0) {
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g_main_context_release(context);
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return ret;
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}
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FD_ZERO(&rfds);
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FD_ZERO(&wfds);
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FD_ZERO(&xfds);
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nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds);
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if (nfds >= 0) {
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select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
|
|
if (select_ret != 0) {
|
|
timeout = 0;
|
|
}
|
|
if (select_ret > 0) {
|
|
pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds);
|
|
}
|
|
}
|
|
|
|
g_main_context_prepare(context, &max_priority);
|
|
n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
|
|
poll_fds, ARRAY_SIZE(poll_fds));
|
|
g_assert(n_poll_fds + w->num <= ARRAY_SIZE(poll_fds));
|
|
|
|
for (i = 0; i < w->num; i++) {
|
|
poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
|
|
poll_fds[n_poll_fds + i].events = G_IO_IN;
|
|
}
|
|
|
|
if (poll_timeout < 0) {
|
|
poll_timeout_ns = -1;
|
|
} else {
|
|
poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS;
|
|
}
|
|
|
|
poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout);
|
|
|
|
bql_unlock();
|
|
|
|
replay_mutex_unlock();
|
|
|
|
g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns);
|
|
|
|
replay_mutex_lock();
|
|
|
|
bql_lock();
|
|
if (g_poll_ret > 0) {
|
|
for (i = 0; i < w->num; i++) {
|
|
w->revents[i] = poll_fds[n_poll_fds + i].revents;
|
|
}
|
|
for (i = 0; i < w->num; i++) {
|
|
if (w->revents[i] && w->func[i]) {
|
|
w->func[i](w->opaque[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
|
|
g_main_context_dispatch(context);
|
|
}
|
|
|
|
g_main_context_release(context);
|
|
|
|
return select_ret || g_poll_ret;
|
|
}
|
|
#endif
|
|
|
|
static NotifierList main_loop_poll_notifiers =
|
|
NOTIFIER_LIST_INITIALIZER(main_loop_poll_notifiers);
|
|
|
|
void main_loop_poll_add_notifier(Notifier *notify)
|
|
{
|
|
notifier_list_add(&main_loop_poll_notifiers, notify);
|
|
}
|
|
|
|
void main_loop_poll_remove_notifier(Notifier *notify)
|
|
{
|
|
notifier_remove(notify);
|
|
}
|
|
|
|
void main_loop_wait(int nonblocking)
|
|
{
|
|
MainLoopPoll mlpoll = {
|
|
.state = MAIN_LOOP_POLL_FILL,
|
|
.timeout = UINT32_MAX,
|
|
.pollfds = gpollfds,
|
|
};
|
|
int ret;
|
|
int64_t timeout_ns;
|
|
|
|
if (nonblocking) {
|
|
mlpoll.timeout = 0;
|
|
}
|
|
|
|
/* poll any events */
|
|
g_array_set_size(gpollfds, 0); /* reset for new iteration */
|
|
/* XXX: separate device handlers from system ones */
|
|
notifier_list_notify(&main_loop_poll_notifiers, &mlpoll);
|
|
|
|
if (mlpoll.timeout == UINT32_MAX) {
|
|
timeout_ns = -1;
|
|
} else {
|
|
timeout_ns = (uint64_t)mlpoll.timeout * (int64_t)(SCALE_MS);
|
|
}
|
|
|
|
timeout_ns = qemu_soonest_timeout(timeout_ns,
|
|
timerlistgroup_deadline_ns(
|
|
&main_loop_tlg));
|
|
|
|
ret = os_host_main_loop_wait(timeout_ns);
|
|
mlpoll.state = ret < 0 ? MAIN_LOOP_POLL_ERR : MAIN_LOOP_POLL_OK;
|
|
notifier_list_notify(&main_loop_poll_notifiers, &mlpoll);
|
|
|
|
if (icount_enabled()) {
|
|
/*
|
|
* CPU thread can infinitely wait for event after
|
|
* missing the warp
|
|
*/
|
|
icount_start_warp_timer();
|
|
}
|
|
qemu_clock_run_all_timers();
|
|
}
|
|
|
|
/* Functions to operate on the main QEMU AioContext. */
|
|
|
|
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name,
|
|
MemReentrancyGuard *reentrancy_guard)
|
|
{
|
|
return aio_bh_new_full(qemu_aio_context, cb, opaque, name,
|
|
reentrancy_guard);
|
|
}
|
|
|
|
/*
|
|
* Functions to operate on the I/O handler AioContext.
|
|
* This context runs on top of main loop. We can't reuse qemu_aio_context
|
|
* because iohandlers mustn't be polled by aio_poll(qemu_aio_context).
|
|
*/
|
|
static AioContext *iohandler_ctx;
|
|
|
|
static void iohandler_init(void)
|
|
{
|
|
if (!iohandler_ctx) {
|
|
iohandler_ctx = aio_context_new(&error_abort);
|
|
}
|
|
}
|
|
|
|
AioContext *iohandler_get_aio_context(void)
|
|
{
|
|
iohandler_init();
|
|
return iohandler_ctx;
|
|
}
|
|
|
|
GSource *iohandler_get_g_source(void)
|
|
{
|
|
iohandler_init();
|
|
return aio_get_g_source(iohandler_ctx);
|
|
}
|
|
|
|
void qemu_set_fd_handler(int fd,
|
|
IOHandler *fd_read,
|
|
IOHandler *fd_write,
|
|
void *opaque)
|
|
{
|
|
iohandler_init();
|
|
aio_set_fd_handler(iohandler_ctx, fd, fd_read, fd_write, NULL, NULL,
|
|
opaque);
|
|
}
|
|
|
|
void event_notifier_set_handler(EventNotifier *e,
|
|
EventNotifierHandler *handler)
|
|
{
|
|
iohandler_init();
|
|
aio_set_event_notifier(iohandler_ctx, e, handler, NULL, NULL);
|
|
}
|