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 can 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 <marcandre.lur...@redhat.com>
---
include/sysemu/vhost-user-backend.h | 60 +++++++
backends/vhost-user.c | 257 ++++++++++++++++++++++++++++
vl.c | 3 +-
backends/Makefile.objs | 3 +-
4 files changed, 321 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 <marcandre.lur...@redhat.com>
+ *
+ * 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..db97037306
--- /dev/null
+++ b/backends/vhost-user.c
@@ -0,0 +1,257 @@
+/*
+ * QEMU vhost-user backend
+ *
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ * Marc-André Lureau <marcandre.lur...@redhat.com>
+ *
+ * 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
+pre_exec_cb(void *data)
+{
+ int *sv = data;
+ int maxfd = sysconf(_SC_OPEN_MAX);
+ int fd;
+
+ dup2(sv[1], 3);
+ for (fd = 4; fd < maxfd; fd++) {
+ close(fd);
+ }
+}
+
+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 6e34fb348d..1c21339ba7 100644
--- a/vl.c
+++ b/vl.c
@@ -2718,7 +2718,8 @@ static bool object_create_initial(const char *type)
}
#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/backends/Makefile.objs b/backends/Makefile.objs
index ad7c0325ed..1ffcf76bb1 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
--
2.18.0.rc1
