Merge tag 'edgar/xilinx-next-2022-09-21.for-upstream' of https://github.com/edgarigl...
[qemu.git] / hw / virtio / vhost-vsock.c
1 /*
2 * Virtio vsock device
3 *
4 * Copyright 2015 Red Hat, Inc.
5 *
6 * Authors:
7 * Stefan Hajnoczi <stefanha@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or
10 * (at your option) any later version. See the COPYING file in the
11 * top-level directory.
12 */
13
14 #include "qemu/osdep.h"
15 #include "standard-headers/linux/virtio_vsock.h"
16 #include "qapi/error.h"
17 #include "hw/virtio/virtio-access.h"
18 #include "qemu/error-report.h"
19 #include "qemu/sockets.h"
20 #include "hw/qdev-properties.h"
21 #include "hw/virtio/vhost-vsock.h"
22 #include "monitor/monitor.h"
23
24 static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config)
25 {
26 VHostVSock *vsock = VHOST_VSOCK(vdev);
27 struct virtio_vsock_config vsockcfg = {};
28
29 virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid);
30 memcpy(config, &vsockcfg, sizeof(vsockcfg));
31 }
32
33 static int vhost_vsock_set_guest_cid(VirtIODevice *vdev)
34 {
35 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
36 VHostVSock *vsock = VHOST_VSOCK(vdev);
37 const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
38 int ret;
39
40 if (!vhost_ops->vhost_vsock_set_guest_cid) {
41 return -ENOSYS;
42 }
43
44 ret = vhost_ops->vhost_vsock_set_guest_cid(&vvc->vhost_dev,
45 vsock->conf.guest_cid);
46 if (ret < 0) {
47 return -errno;
48 }
49 return 0;
50 }
51
52 static int vhost_vsock_set_running(VirtIODevice *vdev, int start)
53 {
54 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
55 const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
56 int ret;
57
58 if (!vhost_ops->vhost_vsock_set_running) {
59 return -ENOSYS;
60 }
61
62 ret = vhost_ops->vhost_vsock_set_running(&vvc->vhost_dev, start);
63 if (ret < 0) {
64 return -errno;
65 }
66 return 0;
67 }
68
69
70 static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
71 {
72 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
73 bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
74 int ret;
75
76 if (!vdev->vm_running) {
77 should_start = false;
78 }
79
80 if (vvc->vhost_dev.started == should_start) {
81 return;
82 }
83
84 if (should_start) {
85 ret = vhost_vsock_common_start(vdev);
86 if (ret < 0) {
87 return;
88 }
89
90 ret = vhost_vsock_set_running(vdev, 1);
91 if (ret < 0) {
92 vhost_vsock_common_stop(vdev);
93 error_report("Error starting vhost vsock: %d", -ret);
94 return;
95 }
96 } else {
97 ret = vhost_vsock_set_running(vdev, 0);
98 if (ret < 0) {
99 error_report("vhost vsock set running failed: %d", ret);
100 return;
101 }
102
103 vhost_vsock_common_stop(vdev);
104 }
105 }
106
107 static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
108 uint64_t requested_features,
109 Error **errp)
110 {
111 return vhost_vsock_common_get_features(vdev, requested_features, errp);
112 }
113
114 static const VMStateDescription vmstate_virtio_vhost_vsock = {
115 .name = "virtio-vhost_vsock",
116 .minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION,
117 .version_id = VHOST_VSOCK_SAVEVM_VERSION,
118 .fields = (VMStateField[]) {
119 VMSTATE_VIRTIO_DEVICE,
120 VMSTATE_END_OF_LIST()
121 },
122 .pre_save = vhost_vsock_common_pre_save,
123 .post_load = vhost_vsock_common_post_load,
124 };
125
126 static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
127 {
128 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
129 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
130 VHostVSock *vsock = VHOST_VSOCK(dev);
131 int vhostfd;
132 int ret;
133
134 /* Refuse to use reserved CID numbers */
135 if (vsock->conf.guest_cid <= 2) {
136 error_setg(errp, "guest-cid property must be greater than 2");
137 return;
138 }
139
140 if (vsock->conf.guest_cid > UINT32_MAX) {
141 error_setg(errp, "guest-cid property must be a 32-bit number");
142 return;
143 }
144
145 if (vsock->conf.vhostfd) {
146 vhostfd = monitor_fd_param(monitor_cur(), vsock->conf.vhostfd, errp);
147 if (vhostfd == -1) {
148 error_prepend(errp, "vhost-vsock: unable to parse vhostfd: ");
149 return;
150 }
151
152 ret = qemu_try_set_nonblock(vhostfd);
153 if (ret < 0) {
154 error_setg_errno(errp, -ret,
155 "vhost-vsock: unable to set non-blocking mode");
156 return;
157 }
158 } else {
159 vhostfd = open("/dev/vhost-vsock", O_RDWR);
160 if (vhostfd < 0) {
161 error_setg_errno(errp, errno,
162 "vhost-vsock: failed to open vhost device");
163 return;
164 }
165
166 qemu_set_nonblock(vhostfd);
167 }
168
169 vhost_vsock_common_realize(vdev, "vhost-vsock");
170
171 ret = vhost_dev_init(&vvc->vhost_dev, (void *)(uintptr_t)vhostfd,
172 VHOST_BACKEND_TYPE_KERNEL, 0, errp);
173 if (ret < 0) {
174 /*
175 * vhostfd is closed by vhost_dev_cleanup, which is called
176 * by vhost_dev_init on initialization error.
177 */
178 goto err_virtio;
179 }
180
181 ret = vhost_vsock_set_guest_cid(vdev);
182 if (ret < 0) {
183 error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
184 goto err_vhost_dev;
185 }
186
187 return;
188
189 err_vhost_dev:
190 /* vhost_dev_cleanup() closes the vhostfd passed to vhost_dev_init() */
191 vhost_dev_cleanup(&vvc->vhost_dev);
192 err_virtio:
193 vhost_vsock_common_unrealize(vdev);
194 }
195
196 static void vhost_vsock_device_unrealize(DeviceState *dev)
197 {
198 VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
199 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
200
201 /* This will stop vhost backend if appropriate. */
202 vhost_vsock_set_status(vdev, 0);
203
204 vhost_dev_cleanup(&vvc->vhost_dev);
205 vhost_vsock_common_unrealize(vdev);
206 }
207
208 static Property vhost_vsock_properties[] = {
209 DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
210 DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
211 DEFINE_PROP_END_OF_LIST(),
212 };
213
214 static void vhost_vsock_class_init(ObjectClass *klass, void *data)
215 {
216 DeviceClass *dc = DEVICE_CLASS(klass);
217 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
218
219 device_class_set_props(dc, vhost_vsock_properties);
220 dc->vmsd = &vmstate_virtio_vhost_vsock;
221 vdc->realize = vhost_vsock_device_realize;
222 vdc->unrealize = vhost_vsock_device_unrealize;
223 vdc->get_features = vhost_vsock_get_features;
224 vdc->get_config = vhost_vsock_get_config;
225 vdc->set_status = vhost_vsock_set_status;
226 }
227
228 static const TypeInfo vhost_vsock_info = {
229 .name = TYPE_VHOST_VSOCK,
230 .parent = TYPE_VHOST_VSOCK_COMMON,
231 .instance_size = sizeof(VHostVSock),
232 .class_init = vhost_vsock_class_init,
233 };
234
235 static void vhost_vsock_register_types(void)
236 {
237 type_register_static(&vhost_vsock_info);
238 }
239
240 type_init(vhost_vsock_register_types)