[qemu.git] / hw / virtio / vhost-vsock.c

/*
 * Virtio vsock device
 *
 * Copyright 2015 Red Hat, Inc.
 *
 * Authors:
 *  Stefan Hajnoczi <[email protected]>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or
 * (at your option) any later version.  See the COPYING file in the
 * top-level directory.
 */

#include <sys/ioctl.h>
#include "qemu/osdep.h"
#include "standard-headers/linux/virtio_vsock.h"
#include "qapi/error.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
#include "migration/migration.h"
#include "qemu/error-report.h"
#include "hw/virtio/vhost-vsock.h"
#include "qemu/iov.h"
#include "monitor/monitor.h"

enum {
    VHOST_VSOCK_SAVEVM_VERSION = 0,

    VHOST_VSOCK_QUEUE_SIZE = 128,
};

static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    struct virtio_vsock_config vsockcfg = {};

    virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid);
    memcpy(config, &vsockcfg, sizeof(vsockcfg));
}

static int vhost_vsock_set_guest_cid(VHostVSock *vsock)
{
    const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
    int ret;

    if (!vhost_ops->vhost_vsock_set_guest_cid) {
        return -ENOSYS;
    }

    ret = vhost_ops->vhost_vsock_set_guest_cid(&vsock->vhost_dev,
                                               vsock->conf.guest_cid);
    if (ret < 0) {
        return -errno;
    }
    return 0;
}

static int vhost_vsock_set_running(VHostVSock *vsock, int start)
{
    const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
    int ret;

    if (!vhost_ops->vhost_vsock_set_running) {
        return -ENOSYS;
    }

    ret = vhost_ops->vhost_vsock_set_running(&vsock->vhost_dev, start);
    if (ret < 0) {
        return -errno;
    }
    return 0;
}

static void vhost_vsock_start(VirtIODevice *vdev)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    int ret;
    int i;

    if (!k->set_guest_notifiers) {
        error_report("binding does not support guest notifiers");
        return;
    }

    ret = vhost_dev_enable_notifiers(&vsock->vhost_dev, vdev);
    if (ret < 0) {
        error_report("Error enabling host notifiers: %d", -ret);
        return;
    }

    ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, true);
    if (ret < 0) {
        error_report("Error binding guest notifier: %d", -ret);
        goto err_host_notifiers;
    }

    vsock->vhost_dev.acked_features = vdev->guest_features;
    ret = vhost_dev_start(&vsock->vhost_dev, vdev);
    if (ret < 0) {
        error_report("Error starting vhost: %d", -ret);
        goto err_guest_notifiers;
    }

    ret = vhost_vsock_set_running(vsock, 1);
    if (ret < 0) {
        error_report("Error starting vhost vsock: %d", -ret);
        goto err_dev_start;
    }

    /* 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 < vsock->vhost_dev.nvqs; i++) {
        vhost_virtqueue_mask(&vsock->vhost_dev, vdev, i, false);
    }

    return;

err_dev_start:
    vhost_dev_stop(&vsock->vhost_dev, vdev);
err_guest_notifiers:
    k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
err_host_notifiers:
    vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
}

static void vhost_vsock_stop(VirtIODevice *vdev)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
    VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
    int ret;

    if (!k->set_guest_notifiers) {
        return;
    }

    ret = vhost_vsock_set_running(vsock, 0);
    if (ret < 0) {
        error_report("vhost vsock set running failed: %d", ret);
        return;
    }

    vhost_dev_stop(&vsock->vhost_dev, vdev);

    ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
    if (ret < 0) {
        error_report("vhost guest notifier cleanup failed: %d", ret);
        return;
    }

    vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
}

static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);
    bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;

    if (!vdev->vm_running) {
        should_start = false;
    }

    if (vsock->vhost_dev.started == should_start) {
        return;
    }

    if (should_start) {
        vhost_vsock_start(vdev);
    } else {
        vhost_vsock_stop(vdev);
    }
}

static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
                                         uint64_t requested_features,
                                         Error **errp)
{
    /* No feature bits used yet */
    return requested_features;
}

static void vhost_vsock_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
    /* Do nothing */
}

static void vhost_vsock_guest_notifier_mask(VirtIODevice *vdev, int idx,
                                            bool mask)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);

    vhost_virtqueue_mask(&vsock->vhost_dev, vdev, idx, mask);
}

static bool vhost_vsock_guest_notifier_pending(VirtIODevice *vdev, int idx)
{
    VHostVSock *vsock = VHOST_VSOCK(vdev);

    return vhost_virtqueue_pending(&vsock->vhost_dev, idx);
}

static void vhost_vsock_send_transport_reset(VHostVSock *vsock)
{
    VirtQueueElement *elem;
    VirtQueue *vq = vsock->event_vq;
    struct virtio_vsock_event event = {
        .id = cpu_to_le32(VIRTIO_VSOCK_EVENT_TRANSPORT_RESET),
    };

    elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
    if (!elem) {
        error_report("vhost-vsock missed transport reset event");
        return;
    }

    if (elem->out_num) {
        error_report("invalid vhost-vsock event virtqueue element with "
                     "out buffers");
        goto out;
    }

    if (iov_from_buf(elem->in_sg, elem->in_num, 0,
                     &event, sizeof(event)) != sizeof(event)) {
        error_report("vhost-vsock event virtqueue element is too short");
        goto out;
    }

    virtqueue_push(vq, elem, sizeof(event));
    virtio_notify(VIRTIO_DEVICE(vsock), vq);

out:
    g_free(elem);
}

static void vhost_vsock_post_load_timer_cleanup(VHostVSock *vsock)
{
    if (!vsock->post_load_timer) {
        return;
    }

    timer_del(vsock->post_load_timer);
    timer_free(vsock->post_load_timer);
    vsock->post_load_timer = NULL;
}

static void vhost_vsock_post_load_timer_cb(void *opaque)
{
    VHostVSock *vsock = opaque;

    vhost_vsock_post_load_timer_cleanup(vsock);
    vhost_vsock_send_transport_reset(vsock);
}

static void vhost_vsock_pre_save(void *opaque)
{
    VHostVSock *vsock = opaque;

    /* At this point, backend must be stopped, otherwise
     * it might keep writing to memory. */
    assert(!vsock->vhost_dev.started);
}

static int vhost_vsock_post_load(void *opaque, int version_id)
{
    VHostVSock *vsock = opaque;
    VirtIODevice *vdev = VIRTIO_DEVICE(vsock);

    if (virtio_queue_get_addr(vdev, 2)) {
        /* Defer transport reset event to a vm clock timer so that virtqueue
         * changes happen after migration has completed.
         */
        assert(!vsock->post_load_timer);
        vsock->post_load_timer =
            timer_new_ns(QEMU_CLOCK_VIRTUAL,
                         vhost_vsock_post_load_timer_cb,
                         vsock);
        timer_mod(vsock->post_load_timer, 1);
    }
    return 0;
}

static const VMStateDescription vmstate_virtio_vhost_vsock = {
    .name = "virtio-vhost_vsock",
    .minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION,
    .version_id = VHOST_VSOCK_SAVEVM_VERSION,
    .fields = (VMStateField[]) {
        VMSTATE_VIRTIO_DEVICE,
        VMSTATE_END_OF_LIST()
    },
    .pre_save = vhost_vsock_pre_save,
    .post_load = vhost_vsock_post_load,
};

static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    VHostVSock *vsock = VHOST_VSOCK(dev);
    int vhostfd;
    int ret;

    /* Refuse to use reserved CID numbers */
    if (vsock->conf.guest_cid <= 2) {
        error_setg(errp, "guest-cid property must be greater than 2");
        return;
    }

    if (vsock->conf.guest_cid > UINT32_MAX) {
        error_setg(errp, "guest-cid property must be a 32-bit number");
        return;
    }

    if (vsock->conf.vhostfd) {
        vhostfd = monitor_fd_param(cur_mon, vsock->conf.vhostfd, errp);
        if (vhostfd == -1) {
            error_prepend(errp, "vhost-vsock: unable to parse vhostfd: ");
            return;
        }
    } else {
        vhostfd = open("/dev/vhost-vsock", O_RDWR);
        if (vhostfd < 0) {
            error_setg_errno(errp, -errno,
                             "vhost-vsock: failed to open vhost device");
            return;
        }
    }

    virtio_init(vdev, "vhost-vsock", VIRTIO_ID_VSOCK,
                sizeof(struct virtio_vsock_config));

    /* Receive and transmit queues belong to vhost */
    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
    virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);

    /* The event queue belongs to QEMU */
    vsock->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
                                       vhost_vsock_handle_output);

    vsock->vhost_dev.nvqs = ARRAY_SIZE(vsock->vhost_vqs);
    vsock->vhost_dev.vqs = vsock->vhost_vqs;
    ret = vhost_dev_init(&vsock->vhost_dev, (void *)(uintptr_t)vhostfd,
                         VHOST_BACKEND_TYPE_KERNEL, 0);
    if (ret < 0) {
        error_setg_errno(errp, -ret, "vhost-vsock: vhost_dev_init failed");
        goto err_virtio;
    }

    ret = vhost_vsock_set_guest_cid(vsock);
    if (ret < 0) {
        error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
        goto err_vhost_dev;
    }

    vsock->post_load_timer = NULL;
    return;

err_vhost_dev:
    vhost_dev_cleanup(&vsock->vhost_dev);
err_virtio:
    virtio_cleanup(vdev);
    close(vhostfd);
    return;
}

static void vhost_vsock_device_unrealize(DeviceState *dev, Error **errp)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    VHostVSock *vsock = VHOST_VSOCK(dev);

    vhost_vsock_post_load_timer_cleanup(vsock);

    /* This will stop vhost backend if appropriate. */
    vhost_vsock_set_status(vdev, 0);

    vhost_dev_cleanup(&vsock->vhost_dev);
    virtio_cleanup(vdev);
}

static Property vhost_vsock_properties[] = {
    DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
    DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
    DEFINE_PROP_END_OF_LIST(),
};

static void vhost_vsock_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);

    dc->props = vhost_vsock_properties;
    dc->vmsd = &vmstate_virtio_vhost_vsock;
    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
    vdc->realize = vhost_vsock_device_realize;
    vdc->unrealize = vhost_vsock_device_unrealize;
    vdc->get_features = vhost_vsock_get_features;
    vdc->get_config = vhost_vsock_get_config;
    vdc->set_status = vhost_vsock_set_status;
    vdc->guest_notifier_mask = vhost_vsock_guest_notifier_mask;
    vdc->guest_notifier_pending = vhost_vsock_guest_notifier_pending;
}

static const TypeInfo vhost_vsock_info = {
    .name = TYPE_VHOST_VSOCK,
    .parent = TYPE_VIRTIO_DEVICE,
    .instance_size = sizeof(VHostVSock),
    .class_init = vhost_vsock_class_init,
};

static void vhost_vsock_register_types(void)
{
    type_register_static(&vhost_vsock_info);
}

type_init(vhost_vsock_register_types)
Commit	Line	Data
fc0b9b0e SH	1	/*
	2	* Virtio vsock device
	3	*
	4	* Copyright 2015 Red Hat, Inc.
	5	*
	6	* Authors:
	7	* Stefan Hajnoczi <[email protected]>
	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 <sys/ioctl.h>
	15	#include "qemu/osdep.h"
	16	#include "standard-headers/linux/virtio_vsock.h"
	17	#include "qapi/error.h"
	18	#include "hw/virtio/virtio-bus.h"
	19	#include "hw/virtio/virtio-access.h"
	20	#include "migration/migration.h"
	21	#include "qemu/error-report.h"
	22	#include "hw/virtio/vhost-vsock.h"
	23	#include "qemu/iov.h"
	24	#include "monitor/monitor.h"
	25
	26	enum {
	27	VHOST_VSOCK_SAVEVM_VERSION = 0,
	28
	29	VHOST_VSOCK_QUEUE_SIZE = 128,
	30	};
	31
	32	static void vhost_vsock_get_config(VirtIODevice vdev, uint8_t config)
	33	{
	34	VHostVSock *vsock = VHOST_VSOCK(vdev);
	35	struct virtio_vsock_config vsockcfg = {};
	36
	37	virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid);
	38	memcpy(config, &vsockcfg, sizeof(vsockcfg));
	39	}
	40
	41	static int vhost_vsock_set_guest_cid(VHostVSock *vsock)
	42	{
	43	const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
	44	int ret;
	45
	46	if (!vhost_ops->vhost_vsock_set_guest_cid) {
	47	return -ENOSYS;
	48	}
	49
	50	ret = vhost_ops->vhost_vsock_set_guest_cid(&vsock->vhost_dev,
	51	vsock->conf.guest_cid);
	52	if (ret < 0) {
	53	return -errno;
	54	}
	55	return 0;
	56	}
	57
	58	static int vhost_vsock_set_running(VHostVSock *vsock, int start)
	59	{
	60	const VhostOps *vhost_ops = vsock->vhost_dev.vhost_ops;
	61	int ret;
	62
	63	if (!vhost_ops->vhost_vsock_set_running) {
	64	return -ENOSYS;
65	}
66
67	ret = vhost_ops->vhost_vsock_set_running(&vsock->vhost_dev, start);
68	if (ret < 0) {
69	return -errno;
70	}
71	return 0;
72	}
73
74	static void vhost_vsock_start(VirtIODevice *vdev)
75	{
76	VHostVSock *vsock = VHOST_VSOCK(vdev);
77	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
78	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
79	int ret;
80	int i;
81
82	if (!k->set_guest_notifiers) {
83	error_report("binding does not support guest notifiers");
84	return;
85	}
86
87	ret = vhost_dev_enable_notifiers(&vsock->vhost_dev, vdev);
88	if (ret < 0) {
89	error_report("Error enabling host notifiers: %d", -ret);
90	return;
91	}
92
93	ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, true);
94	if (ret < 0) {
95	error_report("Error binding guest notifier: %d", -ret);
96	goto err_host_notifiers;
97	}
98
99	vsock->vhost_dev.acked_features = vdev->guest_features;
100	ret = vhost_dev_start(&vsock->vhost_dev, vdev);
101	if (ret < 0) {
102	error_report("Error starting vhost: %d", -ret);
103	goto err_guest_notifiers;
104	}
105
106	ret = vhost_vsock_set_running(vsock, 1);
107	if (ret < 0) {
108	error_report("Error starting vhost vsock: %d", -ret);
109	goto err_dev_start;
110	}
111
112	/* guest_notifier_mask/pending not used yet, so just unmask
113	* everything here. virtio-pci will do the right thing by
114	* enabling/disabling irqfd.
115	*/
116	for (i = 0; i < vsock->vhost_dev.nvqs; i++) {
117	vhost_virtqueue_mask(&vsock->vhost_dev, vdev, i, false);
118	}
119
120	return;
121
122	err_dev_start:
123	vhost_dev_stop(&vsock->vhost_dev, vdev);
124	err_guest_notifiers:
125	k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
126	err_host_notifiers:
127	vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
128	}
129
130	static void vhost_vsock_stop(VirtIODevice *vdev)
131	{
132	VHostVSock *vsock = VHOST_VSOCK(vdev);
133	BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
134	VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
135	int ret;
136
137	if (!k->set_guest_notifiers) {
138	return;
139	}
140
141	ret = vhost_vsock_set_running(vsock, 0);
142	if (ret < 0) {
143	error_report("vhost vsock set running failed: %d", ret);
144	return;
145	}
146
147	vhost_dev_stop(&vsock->vhost_dev, vdev);
148
149	ret = k->set_guest_notifiers(qbus->parent, vsock->vhost_dev.nvqs, false);
150	if (ret < 0) {
151	error_report("vhost guest notifier cleanup failed: %d", ret);
152	return;
153	}
154
155	vhost_dev_disable_notifiers(&vsock->vhost_dev, vdev);
156	}
157
158	static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
159	{
160	VHostVSock *vsock = VHOST_VSOCK(vdev);
161	bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
162
163	if (!vdev->vm_running) {
164	should_start = false;
165	}
166
167	if (vsock->vhost_dev.started == should_start) {
168	return;
169	}
170
171	if (should_start) {
172	vhost_vsock_start(vdev);
173	} else {
174	vhost_vsock_stop(vdev);
175	}
176	}
177
178	static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
179	uint64_t requested_features,
180	Error **errp)
181	{
182	/* No feature bits used yet */
183	return requested_features;
184	}
185
186	static void vhost_vsock_handle_output(VirtIODevice vdev, VirtQueue vq)
187	{
188	/* Do nothing */
189	}
190
191	static void vhost_vsock_guest_notifier_mask(VirtIODevice *vdev, int idx,
192	bool mask)
193	{
194	VHostVSock *vsock = VHOST_VSOCK(vdev);
195
196	vhost_virtqueue_mask(&vsock->vhost_dev, vdev, idx, mask);
197	}
198
199	static bool vhost_vsock_guest_notifier_pending(VirtIODevice *vdev, int idx)
200	{
201	VHostVSock *vsock = VHOST_VSOCK(vdev);
202
203	return vhost_virtqueue_pending(&vsock->vhost_dev, idx);
204	}
205
206	static void vhost_vsock_send_transport_reset(VHostVSock *vsock)
207	{
208	VirtQueueElement *elem;
209	VirtQueue *vq = vsock->event_vq;
210	struct virtio_vsock_event event = {
211	.id = cpu_to_le32(VIRTIO_VSOCK_EVENT_TRANSPORT_RESET),
212	};
213
214	elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
215	if (!elem) {
216	error_report("vhost-vsock missed transport reset event");
217	return;
218	}
219
220	if (elem->out_num) {
221	error_report("invalid vhost-vsock event virtqueue element with "
222	"out buffers");
223	goto out;
224	}
225
226	if (iov_from_buf(elem->in_sg, elem->in_num, 0,
227	&event, sizeof(event)) != sizeof(event)) {
228	error_report("vhost-vsock event virtqueue element is too short");
229	goto out;
230	}
231
232	virtqueue_push(vq, elem, sizeof(event));
233	virtio_notify(VIRTIO_DEVICE(vsock), vq);
234
235	out:
236	g_free(elem);
237	}
238
fc0b9b0e SH	239	static void vhost_vsock_post_load_timer_cleanup(VHostVSock *vsock)
	240	{
	241	if (!vsock->post_load_timer) {
	242	return;
	243	}
	244
	245	timer_del(vsock->post_load_timer);
	246	timer_free(vsock->post_load_timer);
	247	vsock->post_load_timer = NULL;
	248	}
	249
	250	static void vhost_vsock_post_load_timer_cb(void *opaque)
	251	{
	252	VHostVSock *vsock = opaque;
	253
	254	vhost_vsock_post_load_timer_cleanup(vsock);
	255	vhost_vsock_send_transport_reset(vsock);
	256	}
	257
81cc8a65	258	static void vhost_vsock_pre_save(void *opaque)
fc0b9b0e SH	259	{
fc0b9b0e SH	260	VHostVSock *vsock = opaque;
fc0b9b0e	261
81cc8a65 HP	262	/* At this point, backend must be stopped, otherwise
	263	* it might keep writing to memory. */
	264	assert(!vsock->vhost_dev.started);
	265	}
	266
	267	static int vhost_vsock_post_load(void *opaque, int version_id)
	268	{
	269	VHostVSock *vsock = opaque;
	270	VirtIODevice *vdev = VIRTIO_DEVICE(vsock);
fc0b9b0e SH	271
	272	if (virtio_queue_get_addr(vdev, 2)) {
	273	/* Defer transport reset event to a vm clock timer so that virtqueue
	274	* changes happen after migration has completed.
	275	*/
	276	assert(!vsock->post_load_timer);
	277	vsock->post_load_timer =
	278	timer_new_ns(QEMU_CLOCK_VIRTUAL,
	279	vhost_vsock_post_load_timer_cb,
	280	vsock);
	281	timer_mod(vsock->post_load_timer, 1);
	282	}
fc0b9b0e SH	283	return 0;
	284	}
	285
81cc8a65 HP	286	static const VMStateDescription vmstate_virtio_vhost_vsock = {
	287	.name = "virtio-vhost_vsock",
	288	.minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION,
	289	.version_id = VHOST_VSOCK_SAVEVM_VERSION,
	290	.fields = (VMStateField[]) {
	291	VMSTATE_VIRTIO_DEVICE,
	292	VMSTATE_END_OF_LIST()
	293	},
	294	.pre_save = vhost_vsock_pre_save,
	295	.post_load = vhost_vsock_post_load,
	296	};
fc0b9b0e SH	297
	298	static void vhost_vsock_device_realize(DeviceState dev, Error *errp)
	299	{
	300	VirtIODevice *vdev = VIRTIO_DEVICE(dev);
	301	VHostVSock *vsock = VHOST_VSOCK(dev);
	302	int vhostfd;
	303	int ret;
	304
	305	/* Refuse to use reserved CID numbers */
	306	if (vsock->conf.guest_cid <= 2) {
	307	error_setg(errp, "guest-cid property must be greater than 2");
	308	return;
	309	}
	310
	311	if (vsock->conf.guest_cid > UINT32_MAX) {
	312	error_setg(errp, "guest-cid property must be a 32-bit number");
	313	return;
	314	}
	315
	316	if (vsock->conf.vhostfd) {
	317	vhostfd = monitor_fd_param(cur_mon, vsock->conf.vhostfd, errp);
	318	if (vhostfd == -1) {
	319	error_prepend(errp, "vhost-vsock: unable to parse vhostfd: ");
	320	return;
	321	}
	322	} else {
	323	vhostfd = open("/dev/vhost-vsock", O_RDWR);
	324	if (vhostfd < 0) {
	325	error_setg_errno(errp, -errno,
	326	"vhost-vsock: failed to open vhost device");
	327	return;
	328	}
	329	}
	330
	331	virtio_init(vdev, "vhost-vsock", VIRTIO_ID_VSOCK,
	332	sizeof(struct virtio_vsock_config));
	333
	334	/* Receive and transmit queues belong to vhost */
	335	virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
	336	virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE, vhost_vsock_handle_output);
	337
	338	/* The event queue belongs to QEMU */
	339	vsock->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
	340	vhost_vsock_handle_output);
	341
	342	vsock->vhost_dev.nvqs = ARRAY_SIZE(vsock->vhost_vqs);
	343	vsock->vhost_dev.vqs = vsock->vhost_vqs;
	344	ret = vhost_dev_init(&vsock->vhost_dev, (void *)(uintptr_t)vhostfd,
	345	VHOST_BACKEND_TYPE_KERNEL, 0);
	346	if (ret < 0) {
	347	error_setg_errno(errp, -ret, "vhost-vsock: vhost_dev_init failed");
	348	goto err_virtio;
	349	}
	350
	351	ret = vhost_vsock_set_guest_cid(vsock);
	352	if (ret < 0) {
	353	error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
	354	goto err_vhost_dev;
	355	}
	356
	357	vsock->post_load_timer = NULL;
	358	return;
	359
	360	err_vhost_dev:
361	vhost_dev_cleanup(&vsock->vhost_dev);
362	err_virtio:
363	virtio_cleanup(vdev);
364	close(vhostfd);
365	return;
366	}
367
368	static void vhost_vsock_device_unrealize(DeviceState dev, Error *errp)
369	{
370	VirtIODevice *vdev = VIRTIO_DEVICE(dev);
371	VHostVSock *vsock = VHOST_VSOCK(dev);
372
373	vhost_vsock_post_load_timer_cleanup(vsock);
374
375	/* This will stop vhost backend if appropriate. */
376	vhost_vsock_set_status(vdev, 0);
377
378	vhost_dev_cleanup(&vsock->vhost_dev);
379	virtio_cleanup(vdev);
380	}
381
382	static Property vhost_vsock_properties[] = {
383	DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
384	DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
385	DEFINE_PROP_END_OF_LIST(),
386	};
387
388	static void vhost_vsock_class_init(ObjectClass klass, void data)
389	{
390	DeviceClass *dc = DEVICE_CLASS(klass);
391	VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
392
393	dc->props = vhost_vsock_properties;
394	dc->vmsd = &vmstate_virtio_vhost_vsock;
395	set_bit(DEVICE_CATEGORY_MISC, dc->categories);
396	vdc->realize = vhost_vsock_device_realize;
397	vdc->unrealize = vhost_vsock_device_unrealize;
398	vdc->get_features = vhost_vsock_get_features;
399	vdc->get_config = vhost_vsock_get_config;
400	vdc->set_status = vhost_vsock_set_status;
401	vdc->guest_notifier_mask = vhost_vsock_guest_notifier_mask;
402	vdc->guest_notifier_pending = vhost_vsock_guest_notifier_pending;
403	}
404
405	static const TypeInfo vhost_vsock_info = {
406	.name = TYPE_VHOST_VSOCK,
407	.parent = TYPE_VIRTIO_DEVICE,
408	.instance_size = sizeof(VHostVSock),
409	.class_init = vhost_vsock_class_init,
410	};
411
412	static void vhost_vsock_register_types(void)
413	{
414	type_register_static(&vhost_vsock_info);
415	}
416
417	type_init(vhost_vsock_register_types)