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[Qemu-devel] [PATCH for-3.2 05/11] Add vhost-user-backend
From: |
Marc-André Lureau |
Subject: |
[Qemu-devel] [PATCH for-3.2 05/11] Add vhost-user-backend |
Date: |
Mon, 26 Nov 2018 16:42:44 +0400 |
Create a vhost-user-backend object that holds a connection to a
vhost-user backend and can be referenced from virtio devices that
support it. See later patches for input & gpu usage.
A chardev must be specified to communicate with the vhost-user
backend, ex: -chardev socket,id=char0,path=/tmp/foo.sock -object
vhost-user-backend,id=vuid,chardev=char0.
Signed-off-by: Marc-André Lureau <address@hidden>
---
include/sysemu/vhost-user-backend.h | 60 +++++++
backends/vhost-user.c | 244 ++++++++++++++++++++++++++++
vl.c | 3 +-
MAINTAINERS | 2 +
backends/Makefile.objs | 3 +-
qemu-options.hx | 20 +++
6 files changed, 330 insertions(+), 2 deletions(-)
create mode 100644 include/sysemu/vhost-user-backend.h
create mode 100644 backends/vhost-user.c
diff --git a/include/sysemu/vhost-user-backend.h
b/include/sysemu/vhost-user-backend.h
new file mode 100644
index 0000000000..60f811cae7
--- /dev/null
+++ b/include/sysemu/vhost-user-backend.h
@@ -0,0 +1,60 @@
+/*
+ * QEMU vhost-user backend
+ *
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Marc-André Lureau <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+#ifndef QEMU_VHOST_USER_BACKEND_H
+#define QEMU_VHOST_USER_BACKEND_H
+
+#include "qom/object.h"
+#include "exec/memory.h"
+#include "qemu/option.h"
+#include "qemu/bitmap.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-user.h"
+#include "chardev/char-fe.h"
+#include "io/channel.h"
+
+#define TYPE_VHOST_USER_BACKEND "vhost-user-backend"
+#define VHOST_USER_BACKEND(obj) \
+ OBJECT_CHECK(VhostUserBackend, (obj), TYPE_VHOST_USER_BACKEND)
+#define VHOST_USER_BACKEND_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(VhostUserBackendClass, (obj), TYPE_VHOST_USER_BACKEND)
+#define VHOST_USER_BACKEND_CLASS(klass) \
+ OBJECT_CLASS_CHECK(VhostUserBackendClass, (klass), TYPE_VHOST_USER_BACKEND)
+
+typedef struct VhostUserBackend VhostUserBackend;
+typedef struct VhostUserBackendClass VhostUserBackendClass;
+
+struct VhostUserBackendClass {
+ ObjectClass parent_class;
+};
+
+struct VhostUserBackend {
+ /* private */
+ Object parent;
+
+ char *cmd;
+ char *chr_name;
+
+ CharBackend chr;
+ VhostUserState vhost_user;
+ struct vhost_dev dev;
+ QIOChannel *child;
+ VirtIODevice *vdev;
+ bool started;
+ bool completed;
+};
+
+int vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
+ unsigned nvqs, Error **errp);
+void vhost_user_backend_start(VhostUserBackend *b);
+void vhost_user_backend_stop(VhostUserBackend *b);
+
+#endif
diff --git a/backends/vhost-user.c b/backends/vhost-user.c
new file mode 100644
index 0000000000..bf39c0751d
--- /dev/null
+++ b/backends/vhost-user.c
@@ -0,0 +1,244 @@
+/*
+ * QEMU vhost-user backend
+ *
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Marc-André Lureau <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+
+#include "qemu/osdep.h"
+#include "hw/qdev.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
+#include "qemu/error-report.h"
+#include "qom/object_interfaces.h"
+#include "sysemu/vhost-user-backend.h"
+#include "sysemu/kvm.h"
+#include "io/channel-command.h"
+#include "hw/virtio/virtio-bus.h"
+
+static bool
+ioeventfd_enabled(void)
+{
+ return kvm_enabled() && kvm_eventfds_enabled();
+}
+
+int
+vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
+ unsigned nvqs, Error **errp)
+{
+ int ret;
+
+ assert(!b->vdev && vdev);
+
+ if (!ioeventfd_enabled()) {
+ error_setg(errp, "vhost initialization failed: requires kvm");
+ return -1;
+ }
+
+ if (!vhost_user_init(&b->vhost_user, &b->chr, errp)) {
+ return -1;
+ }
+
+ b->vdev = vdev;
+ b->dev.nvqs = nvqs;
+ b->dev.vqs = g_new(struct vhost_virtqueue, nvqs);
+
+ ret = vhost_dev_init(&b->dev, &b->vhost_user, VHOST_BACKEND_TYPE_USER, 0);
+ if (ret < 0) {
+ error_setg_errno(errp, -ret, "vhost initialization failed");
+ return -1;
+ }
+
+ return 0;
+}
+
+void
+vhost_user_backend_start(VhostUserBackend *b)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(b->vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+ int ret, i ;
+
+ if (b->started) {
+ return;
+ }
+
+ if (!k->set_guest_notifiers) {
+ error_report("binding does not support guest notifiers");
+ return;
+ }
+
+ ret = vhost_dev_enable_notifiers(&b->dev, b->vdev);
+ if (ret < 0) {
+ return;
+ }
+
+ ret = k->set_guest_notifiers(qbus->parent, b->dev.nvqs, true);
+ if (ret < 0) {
+ error_report("Error binding guest notifier");
+ goto err_host_notifiers;
+ }
+
+ b->dev.acked_features = b->vdev->guest_features;
+ ret = vhost_dev_start(&b->dev, b->vdev);
+ if (ret < 0) {
+ error_report("Error start vhost dev");
+ goto err_guest_notifiers;
+ }
+
+ /* guest_notifier_mask/pending not used yet, so just unmask
+ * everything here. virtio-pci will do the right thing by
+ * enabling/disabling irqfd.
+ */
+ for (i = 0; i < b->dev.nvqs; i++) {
+ vhost_virtqueue_mask(&b->dev, b->vdev,
+ b->dev.vq_index + i, false);
+ }
+
+ b->started = true;
+ return;
+
+err_guest_notifiers:
+ k->set_guest_notifiers(qbus->parent, b->dev.nvqs, false);
+err_host_notifiers:
+ vhost_dev_disable_notifiers(&b->dev, b->vdev);
+}
+
+void
+vhost_user_backend_stop(VhostUserBackend *b)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(b->vdev)));
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
+ int ret = 0;
+
+ if (!b->started) {
+ return;
+ }
+
+ vhost_dev_stop(&b->dev, b->vdev);
+
+ if (k->set_guest_notifiers) {
+ ret = k->set_guest_notifiers(qbus->parent,
+ b->dev.nvqs, false);
+ if (ret < 0) {
+ error_report("vhost guest notifier cleanup failed: %d", ret);
+ }
+ }
+ assert(ret >= 0);
+
+ vhost_dev_disable_notifiers(&b->dev, b->vdev);
+ b->started = false;
+}
+
+static void
+vhost_user_backend_complete(UserCreatable *uc, Error **errp)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(uc);
+ Chardev *chr;
+
+ if (!b->chr_name) {
+ error_setg(errp, "You must specificy 'chardev'.");
+ return;
+ }
+
+ chr = qemu_chr_find(b->chr_name);
+ if (chr == NULL) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "Chardev '%s' not found", b->chr_name);
+ return;
+ }
+
+ if (!qemu_chr_fe_init(&b->chr, chr, errp)) {
+ return;
+ }
+
+ b->completed = true;
+ /* could vhost_dev_init() happen here, so early vhost-user message
+ * can be exchanged */
+}
+
+static void set_chardev(Object *obj, const char *value, Error **errp)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+
+ if (b->completed) {
+ error_setg(errp, QERR_PERMISSION_DENIED);
+ } else {
+ g_free(b->chr_name);
+ b->chr_name = g_strdup(value);
+ }
+}
+
+static char *get_chardev(Object *obj, Error **errp)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+ Chardev *chr = qemu_chr_fe_get_driver(&b->chr);
+
+ if (chr && chr->label) {
+ return g_strdup(chr->label);
+ }
+
+ return NULL;
+}
+
+static void vhost_user_backend_init(Object *obj)
+{
+ object_property_add_str(obj, "chardev", get_chardev, set_chardev, NULL);
+}
+
+static void vhost_user_backend_finalize(Object *obj)
+{
+ VhostUserBackend *b = VHOST_USER_BACKEND(obj);
+
+ g_free(b->dev.vqs);
+ g_free(b->chr_name);
+
+ vhost_user_cleanup(&b->vhost_user);
+ qemu_chr_fe_deinit(&b->chr, true);
+
+ if (b->child) {
+ object_unref(OBJECT(b->child));
+ }
+}
+
+static bool
+vhost_user_backend_can_be_deleted(UserCreatable *uc)
+{
+ return true;
+}
+
+static void
+vhost_user_backend_class_init(ObjectClass *oc, void *data)
+{
+ UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+
+ ucc->complete = vhost_user_backend_complete;
+ ucc->can_be_deleted = vhost_user_backend_can_be_deleted;
+}
+
+static const TypeInfo vhost_user_backend_info = {
+ .name = TYPE_VHOST_USER_BACKEND,
+ .parent = TYPE_OBJECT,
+ .instance_size = sizeof(VhostUserBackend),
+ .instance_init = vhost_user_backend_init,
+ .instance_finalize = vhost_user_backend_finalize,
+ .class_size = sizeof(VhostUserBackendClass),
+ .class_init = vhost_user_backend_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { TYPE_USER_CREATABLE },
+ { }
+ }
+};
+
+static void register_types(void)
+{
+ type_register_static(&vhost_user_backend_info);
+}
+
+type_init(register_types);
diff --git a/vl.c b/vl.c
index fa25d1ae2d..903ea9a445 100644
--- a/vl.c
+++ b/vl.c
@@ -2798,7 +2798,8 @@ static bool object_create_initial(const char *type,
QemuOpts *opts)
}
#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
- if (g_str_equal(type, "cryptodev-vhost-user")) {
+ if (g_str_equal(type, "cryptodev-vhost-user") ||
+ g_str_equal(type, "vhost-user-backend")) {
return false;
}
#endif
diff --git a/MAINTAINERS b/MAINTAINERS
index 81e4368a43..1507f941dc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1337,6 +1337,8 @@ S: Supported
F: hw/*/*vhost*
F: docs/interop/vhost-user.json
F: docs/interop/vhost-user.txt
+F: backends/vhost-user.c
+F: include/sysemu/vhost-user-backend.h
virtio
M: Michael S. Tsirkin <address@hidden>
diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index 717fcbdae4..a5ec0bf907 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -12,7 +12,8 @@ common-obj-y += cryptodev-builtin.o
ifeq ($(CONFIG_VIRTIO),y)
common-obj-y += cryptodev-vhost.o
common-obj-$(call land,$(CONFIG_VHOST_USER),$(CONFIG_LINUX)) += \
- cryptodev-vhost-user.o
+ cryptodev-vhost-user.o \
+ vhost-user.o
endif
common-obj-$(CONFIG_LINUX) += hostmem-memfd.o
diff --git a/qemu-options.hx b/qemu-options.hx
index f7df472f43..2346521703 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4241,6 +4241,26 @@ secondary:
If you want to know the detail of above command line, you can read
the colo-compare git log.
address@hidden -object vhost-user-backend,address@hidden,address@hidden
+
+Create a vhost-user-backend object that holds a connection to a
+vhost-user backend and can be referenced from virtio/vhost-user
+devices that support it.
+
+The @var{id} parameter is a unique ID that will be used to reference
+this vhost-user backend from the @option{vhost-user} device. The
address@hidden parameter is the unique ID of a character device backend
+that provides the connection to the vhost-user slave process. (Since 3.2)
+
address@hidden
+
+ # qemu-system-x86_64 \
+ [...] \
+ -object vhost-user-backend,id=vuid,chardev=char0 \
+ -device vhost-user-input-pci,vhost-user=vuid
+ [...]
address@hidden example
+
@item -object cryptodev-backend-builtin,address@hidden,address@hidden
Creates a cryptodev backend which executes crypto opreation from
--
2.20.0.rc1
- [Qemu-devel] [PATCH for-3.2 00/11] vhost-user-backend & vhost-user-input, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 01/11] vhost-user: define conventions for vhost-user backends, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 02/11] vhost-user: simplify vhost_user_init/vhost_user_cleanup, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 03/11] libvhost-user: exit by default on VHOST_USER_NONE, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 04/11] vhost-user: wrap some read/write with retry handling, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 05/11] Add vhost-user-backend,
Marc-André Lureau <=
- [Qemu-devel] [PATCH for-3.2 06/11] vhost-user: split vhost_user_read(), Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 07/11] vhost-user: add vhost_user_input_get_config(), Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 08/11] libvhost-user-glib: export vug_source_new(), Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 09/11] libvhost-user: add vu_queue_unpop(), Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 10/11] Add vhost-user-input-pci, Marc-André Lureau, 2018/11/26
- [Qemu-devel] [PATCH for-3.2 11/11] contrib: add vhost-user-input, Marc-André Lureau, 2018/11/26