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234 lines
7.1 KiB
234 lines
7.1 KiB
From b4969662de01848f887a3918e97e516efc213f71 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzju@redhat.com>
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Date: Mon, 25 Apr 2022 09:57:22 +0200
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Subject: [PATCH 02/16] util/main-loop: Introduce the main loop into QOM
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RH-Author: Nicolas Saenz Julienne <nsaenzju@redhat.com>
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RH-MergeRequest: 93: util/thread-pool: Expose minimum and maximum size
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RH-Commit: [2/3] a481b77e25ad50d13dcbe26b36c551b18c89bddd
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RH-Bugzilla: 2031024
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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'event-loop-base' provides basic property handling for all 'AioContext'
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based event loops. So let's define a new 'MainLoopClass' that inherits
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from it. This will permit tweaking the main loop's properties through
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qapi as well as through the command line using the '-object' keyword[1].
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Only one instance of 'MainLoopClass' might be created at any time.
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'EventLoopBaseClass' learns a new callback, 'can_be_deleted()' so as to
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mark 'MainLoop' as non-deletable.
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[1] For example:
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-object main-loop,id=main-loop,aio-max-batch=<value>
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Signed-off-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Acked-by: Markus Armbruster <armbru@redhat.com>
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Message-id: 20220425075723.20019-3-nsaenzju@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 70ac26b9e5ca8374bb3ef3f30b871726673c9f27)
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---
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event-loop-base.c | 13 ++++++++
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include/qemu/main-loop.h | 10 ++++++
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include/sysemu/event-loop-base.h | 1 +
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meson.build | 3 +-
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qapi/qom.json | 13 ++++++++
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util/main-loop.c | 56 ++++++++++++++++++++++++++++++++
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6 files changed, 95 insertions(+), 1 deletion(-)
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diff --git a/event-loop-base.c b/event-loop-base.c
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index a924c73a7c..e7f99a6ec8 100644
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--- a/event-loop-base.c
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+++ b/event-loop-base.c
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@@ -73,10 +73,23 @@ static void event_loop_base_complete(UserCreatable *uc, Error **errp)
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}
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}
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+static bool event_loop_base_can_be_deleted(UserCreatable *uc)
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+{
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+ EventLoopBaseClass *bc = EVENT_LOOP_BASE_GET_CLASS(uc);
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+ EventLoopBase *backend = EVENT_LOOP_BASE(uc);
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+
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+ if (bc->can_be_deleted) {
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+ return bc->can_be_deleted(backend);
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+ }
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+
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+ return true;
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+}
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+
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static void event_loop_base_class_init(ObjectClass *klass, void *class_data)
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{
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UserCreatableClass *ucc = USER_CREATABLE_CLASS(klass);
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ucc->complete = event_loop_base_complete;
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+ ucc->can_be_deleted = event_loop_base_can_be_deleted;
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object_class_property_add(klass, "aio-max-batch", "int",
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event_loop_base_get_param,
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diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h
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index d3750c8e76..20c9387654 100644
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--- a/include/qemu/main-loop.h
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+++ b/include/qemu/main-loop.h
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@@ -26,9 +26,19 @@
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#define QEMU_MAIN_LOOP_H
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#include "block/aio.h"
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+#include "qom/object.h"
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+#include "sysemu/event-loop-base.h"
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#define SIG_IPI SIGUSR1
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+#define TYPE_MAIN_LOOP "main-loop"
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+OBJECT_DECLARE_TYPE(MainLoop, MainLoopClass, MAIN_LOOP)
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+
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+struct MainLoop {
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+ EventLoopBase parent_obj;
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+};
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+typedef struct MainLoop MainLoop;
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+
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/**
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* qemu_init_main_loop: Set up the process so that it can run the main loop.
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*
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diff --git a/include/sysemu/event-loop-base.h b/include/sysemu/event-loop-base.h
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index 8e77d8b69f..fced4c9fea 100644
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--- a/include/sysemu/event-loop-base.h
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+++ b/include/sysemu/event-loop-base.h
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@@ -25,6 +25,7 @@ struct EventLoopBaseClass {
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void (*init)(EventLoopBase *base, Error **errp);
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void (*update_params)(EventLoopBase *base, Error **errp);
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+ bool (*can_be_deleted)(EventLoopBase *base);
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};
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struct EventLoopBase {
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diff --git a/meson.build b/meson.build
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index b9c919a55e..5a7c10e639 100644
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--- a/meson.build
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+++ b/meson.build
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@@ -2832,7 +2832,8 @@ libqemuutil = static_library('qemuutil',
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sources: util_ss.sources() + stub_ss.sources() + genh,
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dependencies: [util_ss.dependencies(), libm, threads, glib, socket, malloc, pixman])
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qemuutil = declare_dependency(link_with: libqemuutil,
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- sources: genh + version_res)
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+ sources: genh + version_res,
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+ dependencies: [event_loop_base])
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if have_system or have_user
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decodetree = generator(find_program('scripts/decodetree.py'),
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diff --git a/qapi/qom.json b/qapi/qom.json
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index a2439533c5..7d4a2ac1b9 100644
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--- a/qapi/qom.json
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+++ b/qapi/qom.json
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@@ -540,6 +540,17 @@
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'*poll-grow': 'int',
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'*poll-shrink': 'int' } }
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+##
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+# @MainLoopProperties:
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+#
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+# Properties for the main-loop object.
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+#
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+# Since: 7.1
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+##
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+{ 'struct': 'MainLoopProperties',
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+ 'base': 'EventLoopBaseProperties',
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+ 'data': {} }
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+
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##
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# @MemoryBackendProperties:
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#
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@@ -830,6 +841,7 @@
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{ 'name': 'input-linux',
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'if': 'CONFIG_LINUX' },
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'iothread',
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+ 'main-loop',
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{ 'name': 'memory-backend-epc',
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'if': 'CONFIG_LINUX' },
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'memory-backend-file',
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@@ -895,6 +907,7 @@
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'input-linux': { 'type': 'InputLinuxProperties',
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'if': 'CONFIG_LINUX' },
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'iothread': 'IothreadProperties',
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+ 'main-loop': 'MainLoopProperties',
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'memory-backend-epc': { 'type': 'MemoryBackendEpcProperties',
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'if': 'CONFIG_LINUX' },
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'memory-backend-file': 'MemoryBackendFileProperties',
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diff --git a/util/main-loop.c b/util/main-loop.c
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index b7b0ce4ca0..5b13f456fa 100644
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--- a/util/main-loop.c
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+++ b/util/main-loop.c
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@@ -33,6 +33,7 @@
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#include "qemu/error-report.h"
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#include "qemu/queue.h"
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#include "qemu/compiler.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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@@ -184,6 +185,61 @@ int qemu_init_main_loop(Error **errp)
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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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+ 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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+
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+ aio_context_set_aio_params(qemu_aio_context, base->aio_max_batch, errp);
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+}
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+
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+MainLoop *mloop;
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+
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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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+
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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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+
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+ main_loop_update_params(base, errp);
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+
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+ mloop = m;
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+ return;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+type_init(main_loop_register_types)
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+
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static int max_priority;
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#ifndef _WIN32
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--
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2.31.1
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