This patch prepares the introduction of vhost-user-vsock, moving the common code usable for both vhost-vsock and vhost-user-vsock devices, in the new vhost-vsock-common parent class. While moving the code, fixed checkpatch warnings about block comments. Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20200522122512.87413-2-sgarzare@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
234 lines
6.4 KiB
C
234 lines
6.4 KiB
C
/*
|
|
* Virtio vsock device
|
|
*
|
|
* Copyright 2015 Red Hat, Inc.
|
|
*
|
|
* Authors:
|
|
* Stefan Hajnoczi <stefanha@redhat.com>
|
|
*
|
|
* 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 "qemu/osdep.h"
|
|
#include "standard-headers/linux/virtio_vsock.h"
|
|
#include "qapi/error.h"
|
|
#include "hw/virtio/virtio-access.h"
|
|
#include "qemu/error-report.h"
|
|
#include "hw/qdev-properties.h"
|
|
#include "hw/virtio/vhost-vsock.h"
|
|
#include "monitor/monitor.h"
|
|
|
|
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(VirtIODevice *vdev)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
VHostVSock *vsock = VHOST_VSOCK(vdev);
|
|
const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
|
|
int ret;
|
|
|
|
if (!vhost_ops->vhost_vsock_set_guest_cid) {
|
|
return -ENOSYS;
|
|
}
|
|
|
|
ret = vhost_ops->vhost_vsock_set_guest_cid(&vvc->vhost_dev,
|
|
vsock->conf.guest_cid);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int vhost_vsock_set_running(VirtIODevice *vdev, int start)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
|
|
int ret;
|
|
|
|
if (!vhost_ops->vhost_vsock_set_running) {
|
|
return -ENOSYS;
|
|
}
|
|
|
|
ret = vhost_ops->vhost_vsock_set_running(&vvc->vhost_dev, start);
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
|
|
int ret;
|
|
|
|
if (!vdev->vm_running) {
|
|
should_start = false;
|
|
}
|
|
|
|
if (vvc->vhost_dev.started == should_start) {
|
|
return;
|
|
}
|
|
|
|
if (should_start) {
|
|
ret = vhost_vsock_common_start(vdev);
|
|
if (ret < 0) {
|
|
return;
|
|
}
|
|
|
|
ret = vhost_vsock_set_running(vdev, 1);
|
|
if (ret < 0) {
|
|
vhost_vsock_common_stop(vdev);
|
|
error_report("Error starting vhost vsock: %d", -ret);
|
|
return;
|
|
}
|
|
} else {
|
|
ret = vhost_vsock_set_running(vdev, 0);
|
|
if (ret < 0) {
|
|
error_report("vhost vsock set running failed: %d", ret);
|
|
return;
|
|
}
|
|
|
|
vhost_vsock_common_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 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_common_pre_save,
|
|
.post_load = vhost_vsock_common_post_load,
|
|
};
|
|
|
|
static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
|
|
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;
|
|
}
|
|
}
|
|
|
|
vhost_vsock_common_realize(vdev, "vhost-vsock");
|
|
|
|
ret = vhost_dev_init(&vvc->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(vdev);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
|
|
goto err_vhost_dev;
|
|
}
|
|
|
|
return;
|
|
|
|
err_vhost_dev:
|
|
vhost_dev_cleanup(&vvc->vhost_dev);
|
|
/* vhost_dev_cleanup() closes the vhostfd passed to vhost_dev_init() */
|
|
vhostfd = -1;
|
|
err_virtio:
|
|
vhost_vsock_common_unrealize(vdev);
|
|
if (vhostfd >= 0) {
|
|
close(vhostfd);
|
|
}
|
|
return;
|
|
}
|
|
|
|
static void vhost_vsock_device_unrealize(DeviceState *dev)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
|
|
/* This will stop vhost backend if appropriate. */
|
|
vhost_vsock_set_status(vdev, 0);
|
|
|
|
vhost_dev_cleanup(&vvc->vhost_dev);
|
|
vhost_vsock_common_unrealize(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);
|
|
|
|
device_class_set_props(dc, vhost_vsock_properties);
|
|
dc->vmsd = &vmstate_virtio_vhost_vsock;
|
|
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;
|
|
}
|
|
|
|
static const TypeInfo vhost_vsock_info = {
|
|
.name = TYPE_VHOST_VSOCK,
|
|
.parent = TYPE_VHOST_VSOCK_COMMON,
|
|
.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)
|