2 * QEMU vhost-user backend
4 * Copyright (C) 2018 Red Hat Inc
7 * Marc-André Lureau <marcandre.lureau@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include "qapi/error.h"
16 #include "qapi/qmp/qerror.h"
17 #include "qemu/error-report.h"
18 #include "qom/object_interfaces.h"
19 #include "sysemu/vhost-user-backend.h"
20 #include "sysemu/kvm.h"
21 #include "io/channel-command.h"
22 #include "hw/virtio/virtio-bus.h"
25 ioeventfd_enabled(void)
27 return kvm_enabled() && kvm_eventfds_enabled();
31 vhost_user_backend_dev_init(VhostUserBackend
*b
, VirtIODevice
*vdev
,
32 unsigned nvqs
, Error
**errp
)
36 assert(!b
->vdev
&& vdev
);
38 if (!ioeventfd_enabled()) {
39 error_setg(errp
, "vhost initialization failed: requires kvm");
43 if (!vhost_user_init(&b
->vhost_user
, &b
->chr
, errp
)) {
49 b
->dev
.vqs
= g_new(struct vhost_virtqueue
, nvqs
);
51 ret
= vhost_dev_init(&b
->dev
, &b
->vhost_user
, VHOST_BACKEND_TYPE_USER
, 0);
53 error_setg_errno(errp
, -ret
, "vhost initialization failed");
61 vhost_user_backend_start(VhostUserBackend
*b
)
63 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(b
->vdev
)));
64 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
71 if (!k
->set_guest_notifiers
) {
72 error_report("binding does not support guest notifiers");
76 ret
= vhost_dev_enable_notifiers(&b
->dev
, b
->vdev
);
81 ret
= k
->set_guest_notifiers(qbus
->parent
, b
->dev
.nvqs
, true);
83 error_report("Error binding guest notifier");
84 goto err_host_notifiers
;
87 b
->dev
.acked_features
= b
->vdev
->guest_features
;
88 ret
= vhost_dev_start(&b
->dev
, b
->vdev
);
90 error_report("Error start vhost dev");
91 goto err_guest_notifiers
;
94 /* guest_notifier_mask/pending not used yet, so just unmask
95 * everything here. virtio-pci will do the right thing by
96 * enabling/disabling irqfd.
98 for (i
= 0; i
< b
->dev
.nvqs
; i
++) {
99 vhost_virtqueue_mask(&b
->dev
, b
->vdev
,
100 b
->dev
.vq_index
+ i
, false);
107 k
->set_guest_notifiers(qbus
->parent
, b
->dev
.nvqs
, false);
109 vhost_dev_disable_notifiers(&b
->dev
, b
->vdev
);
113 vhost_user_backend_stop(VhostUserBackend
*b
)
115 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(b
->vdev
)));
116 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
123 vhost_dev_stop(&b
->dev
, b
->vdev
);
125 if (k
->set_guest_notifiers
) {
126 ret
= k
->set_guest_notifiers(qbus
->parent
,
129 error_report("vhost guest notifier cleanup failed: %d", ret
);
134 vhost_dev_disable_notifiers(&b
->dev
, b
->vdev
);
138 static void set_chardev(Object
*obj
, const char *value
, Error
**errp
)
140 VhostUserBackend
*b
= VHOST_USER_BACKEND(obj
);
144 error_setg(errp
, QERR_PERMISSION_DENIED
);
149 b
->chr_name
= g_strdup(value
);
151 chr
= qemu_chr_find(b
->chr_name
);
153 error_set(errp
, ERROR_CLASS_DEVICE_NOT_FOUND
,
154 "Chardev '%s' not found", b
->chr_name
);
158 if (!qemu_chr_fe_init(&b
->chr
, chr
, errp
)) {
163 /* could call vhost_dev_init() so early message can be exchanged */
166 static char *get_chardev(Object
*obj
, Error
**errp
)
168 VhostUserBackend
*b
= VHOST_USER_BACKEND(obj
);
169 Chardev
*chr
= qemu_chr_fe_get_driver(&b
->chr
);
171 if (chr
&& chr
->label
) {
172 return g_strdup(chr
->label
);
178 static void vhost_user_backend_init(Object
*obj
)
180 object_property_add_str(obj
, "chardev", get_chardev
, set_chardev
, NULL
);
183 static void vhost_user_backend_finalize(Object
*obj
)
185 VhostUserBackend
*b
= VHOST_USER_BACKEND(obj
);
190 vhost_user_cleanup(&b
->vhost_user
);
191 qemu_chr_fe_deinit(&b
->chr
, true);
194 static const TypeInfo vhost_user_backend_info
= {
195 .name
= TYPE_VHOST_USER_BACKEND
,
196 .parent
= TYPE_OBJECT
,
197 .instance_size
= sizeof(VhostUserBackend
),
198 .instance_init
= vhost_user_backend_init
,
199 .instance_finalize
= vhost_user_backend_finalize
,
200 .class_size
= sizeof(VhostUserBackendClass
),
203 static void register_types(void)
205 type_register_static(&vhost_user_backend_info
);
208 type_init(register_types
);