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>
259 lines
7.2 KiB
C
259 lines
7.2 KiB
C
/*
|
|
* Parent class for vhost-vsock devices
|
|
*
|
|
* Copyright 2015-2020 Red Hat, Inc.
|
|
*
|
|
* 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 "qemu/iov.h"
|
|
#include "monitor/monitor.h"
|
|
|
|
int vhost_vsock_common_start(VirtIODevice *vdev)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(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 -ENOSYS;
|
|
}
|
|
|
|
ret = vhost_dev_enable_notifiers(&vvc->vhost_dev, vdev);
|
|
if (ret < 0) {
|
|
error_report("Error enabling host notifiers: %d", -ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, true);
|
|
if (ret < 0) {
|
|
error_report("Error binding guest notifier: %d", -ret);
|
|
goto err_host_notifiers;
|
|
}
|
|
|
|
vvc->vhost_dev.acked_features = vdev->guest_features;
|
|
ret = vhost_dev_start(&vvc->vhost_dev, vdev);
|
|
if (ret < 0) {
|
|
error_report("Error starting vhost: %d", -ret);
|
|
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 < vvc->vhost_dev.nvqs; i++) {
|
|
vhost_virtqueue_mask(&vvc->vhost_dev, vdev, i, false);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_guest_notifiers:
|
|
k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false);
|
|
err_host_notifiers:
|
|
vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev);
|
|
return ret;
|
|
}
|
|
|
|
void vhost_vsock_common_stop(VirtIODevice *vdev)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(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;
|
|
}
|
|
|
|
vhost_dev_stop(&vvc->vhost_dev, vdev);
|
|
|
|
ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false);
|
|
if (ret < 0) {
|
|
error_report("vhost guest notifier cleanup failed: %d", ret);
|
|
return;
|
|
}
|
|
|
|
vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev);
|
|
}
|
|
|
|
|
|
static void vhost_vsock_common_handle_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/* Do nothing */
|
|
}
|
|
|
|
static void vhost_vsock_common_guest_notifier_mask(VirtIODevice *vdev, int idx,
|
|
bool mask)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
|
|
vhost_virtqueue_mask(&vvc->vhost_dev, vdev, idx, mask);
|
|
}
|
|
|
|
static bool vhost_vsock_common_guest_notifier_pending(VirtIODevice *vdev,
|
|
int idx)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
|
|
return vhost_virtqueue_pending(&vvc->vhost_dev, idx);
|
|
}
|
|
|
|
static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc)
|
|
{
|
|
VirtQueueElement *elem;
|
|
VirtQueue *vq = vvc->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(vvc), vq);
|
|
|
|
out:
|
|
g_free(elem);
|
|
}
|
|
|
|
static void vhost_vsock_common_post_load_timer_cleanup(VHostVSockCommon *vvc)
|
|
{
|
|
if (!vvc->post_load_timer) {
|
|
return;
|
|
}
|
|
|
|
timer_del(vvc->post_load_timer);
|
|
timer_free(vvc->post_load_timer);
|
|
vvc->post_load_timer = NULL;
|
|
}
|
|
|
|
static void vhost_vsock_common_post_load_timer_cb(void *opaque)
|
|
{
|
|
VHostVSockCommon *vvc = opaque;
|
|
|
|
vhost_vsock_common_post_load_timer_cleanup(vvc);
|
|
vhost_vsock_common_send_transport_reset(vvc);
|
|
}
|
|
|
|
int vhost_vsock_common_pre_save(void *opaque)
|
|
{
|
|
VHostVSockCommon *vvc = opaque;
|
|
|
|
/*
|
|
* At this point, backend must be stopped, otherwise
|
|
* it might keep writing to memory.
|
|
*/
|
|
assert(!vvc->vhost_dev.started);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vhost_vsock_common_post_load(void *opaque, int version_id)
|
|
{
|
|
VHostVSockCommon *vvc = opaque;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(vvc);
|
|
|
|
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(!vvc->post_load_timer);
|
|
vvc->post_load_timer =
|
|
timer_new_ns(QEMU_CLOCK_VIRTUAL,
|
|
vhost_vsock_common_post_load_timer_cb,
|
|
vvc);
|
|
timer_mod(vvc->post_load_timer, 1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void vhost_vsock_common_realize(VirtIODevice *vdev, const char *name)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
|
|
virtio_init(vdev, name, VIRTIO_ID_VSOCK,
|
|
sizeof(struct virtio_vsock_config));
|
|
|
|
/* Receive and transmit queues belong to vhost */
|
|
vvc->recv_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
|
|
vhost_vsock_common_handle_output);
|
|
vvc->trans_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
|
|
vhost_vsock_common_handle_output);
|
|
|
|
/* The event queue belongs to QEMU */
|
|
vvc->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
|
|
vhost_vsock_common_handle_output);
|
|
|
|
vvc->vhost_dev.nvqs = ARRAY_SIZE(vvc->vhost_vqs);
|
|
vvc->vhost_dev.vqs = vvc->vhost_vqs;
|
|
|
|
vvc->post_load_timer = NULL;
|
|
}
|
|
|
|
void vhost_vsock_common_unrealize(VirtIODevice *vdev)
|
|
{
|
|
VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
|
|
|
|
vhost_vsock_common_post_load_timer_cleanup(vvc);
|
|
|
|
virtio_delete_queue(vvc->recv_vq);
|
|
virtio_delete_queue(vvc->trans_vq);
|
|
virtio_delete_queue(vvc->event_vq);
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void vhost_vsock_common_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
vdc->guest_notifier_mask = vhost_vsock_common_guest_notifier_mask;
|
|
vdc->guest_notifier_pending = vhost_vsock_common_guest_notifier_pending;
|
|
}
|
|
|
|
static const TypeInfo vhost_vsock_common_info = {
|
|
.name = TYPE_VHOST_VSOCK_COMMON,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VHostVSockCommon),
|
|
.class_init = vhost_vsock_common_class_init,
|
|
.abstract = true,
|
|
};
|
|
|
|
static void vhost_vsock_common_register_types(void)
|
|
{
|
|
type_register_static(&vhost_vsock_common_info);
|
|
}
|
|
|
|
type_init(vhost_vsock_common_register_types)
|