258 lines
7.2 KiB
C
258 lines
7.2 KiB
C
/*
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* Parent class for vhost-vsock devices
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*
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* Copyright 2015-2020 Red Hat, Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "standard-headers/linux/virtio_vsock.h"
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#include "qapi/error.h"
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#include "hw/virtio/virtio-access.h"
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#include "qemu/error-report.h"
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#include "hw/qdev-properties.h"
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#include "hw/virtio/vhost-vsock.h"
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#include "qemu/iov.h"
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#include "monitor/monitor.h"
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int vhost_vsock_common_start(VirtIODevice *vdev)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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int ret;
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int i;
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if (!k->set_guest_notifiers) {
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error_report("binding does not support guest notifiers");
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return -ENOSYS;
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}
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ret = vhost_dev_enable_notifiers(&vvc->vhost_dev, vdev);
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if (ret < 0) {
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error_report("Error enabling host notifiers: %d", -ret);
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return ret;
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}
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ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, true);
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if (ret < 0) {
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error_report("Error binding guest notifier: %d", -ret);
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goto err_host_notifiers;
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}
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vvc->vhost_dev.acked_features = vdev->guest_features;
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ret = vhost_dev_start(&vvc->vhost_dev, vdev);
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if (ret < 0) {
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error_report("Error starting vhost: %d", -ret);
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goto err_guest_notifiers;
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}
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/*
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* guest_notifier_mask/pending not used yet, so just unmask
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* everything here. virtio-pci will do the right thing by
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* enabling/disabling irqfd.
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*/
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for (i = 0; i < vvc->vhost_dev.nvqs; i++) {
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vhost_virtqueue_mask(&vvc->vhost_dev, vdev, i, false);
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}
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return 0;
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err_guest_notifiers:
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k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false);
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err_host_notifiers:
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vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev);
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return ret;
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}
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void vhost_vsock_common_stop(VirtIODevice *vdev)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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int ret;
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if (!k->set_guest_notifiers) {
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return;
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}
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vhost_dev_stop(&vvc->vhost_dev, vdev);
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ret = k->set_guest_notifiers(qbus->parent, vvc->vhost_dev.nvqs, false);
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if (ret < 0) {
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error_report("vhost guest notifier cleanup failed: %d", ret);
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return;
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}
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vhost_dev_disable_notifiers(&vvc->vhost_dev, vdev);
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}
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static void vhost_vsock_common_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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/* Do nothing */
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}
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static void vhost_vsock_common_guest_notifier_mask(VirtIODevice *vdev, int idx,
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bool mask)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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vhost_virtqueue_mask(&vvc->vhost_dev, vdev, idx, mask);
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}
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static bool vhost_vsock_common_guest_notifier_pending(VirtIODevice *vdev,
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int idx)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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return vhost_virtqueue_pending(&vvc->vhost_dev, idx);
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}
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static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc)
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{
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VirtQueueElement *elem;
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VirtQueue *vq = vvc->event_vq;
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struct virtio_vsock_event event = {
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.id = cpu_to_le32(VIRTIO_VSOCK_EVENT_TRANSPORT_RESET),
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};
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elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
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if (!elem) {
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error_report("vhost-vsock missed transport reset event");
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return;
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}
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if (elem->out_num) {
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error_report("invalid vhost-vsock event virtqueue element with "
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"out buffers");
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goto out;
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}
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if (iov_from_buf(elem->in_sg, elem->in_num, 0,
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&event, sizeof(event)) != sizeof(event)) {
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error_report("vhost-vsock event virtqueue element is too short");
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goto out;
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}
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virtqueue_push(vq, elem, sizeof(event));
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virtio_notify(VIRTIO_DEVICE(vvc), vq);
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out:
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g_free(elem);
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}
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static void vhost_vsock_common_post_load_timer_cleanup(VHostVSockCommon *vvc)
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{
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if (!vvc->post_load_timer) {
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return;
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}
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timer_del(vvc->post_load_timer);
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timer_free(vvc->post_load_timer);
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vvc->post_load_timer = NULL;
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}
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static void vhost_vsock_common_post_load_timer_cb(void *opaque)
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{
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VHostVSockCommon *vvc = opaque;
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vhost_vsock_common_post_load_timer_cleanup(vvc);
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vhost_vsock_common_send_transport_reset(vvc);
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}
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int vhost_vsock_common_pre_save(void *opaque)
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{
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VHostVSockCommon *vvc = opaque;
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/*
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* At this point, backend must be stopped, otherwise
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* it might keep writing to memory.
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*/
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assert(!vvc->vhost_dev.started);
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return 0;
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}
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int vhost_vsock_common_post_load(void *opaque, int version_id)
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{
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VHostVSockCommon *vvc = opaque;
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VirtIODevice *vdev = VIRTIO_DEVICE(vvc);
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if (virtio_queue_get_addr(vdev, 2)) {
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/*
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* Defer transport reset event to a vm clock timer so that virtqueue
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* changes happen after migration has completed.
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*/
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assert(!vvc->post_load_timer);
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vvc->post_load_timer =
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timer_new_ns(QEMU_CLOCK_VIRTUAL,
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vhost_vsock_common_post_load_timer_cb,
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vvc);
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timer_mod(vvc->post_load_timer, 1);
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}
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return 0;
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}
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void vhost_vsock_common_realize(VirtIODevice *vdev, const char *name)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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virtio_init(vdev, name, VIRTIO_ID_VSOCK,
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sizeof(struct virtio_vsock_config));
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/* Receive and transmit queues belong to vhost */
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vvc->recv_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
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vhost_vsock_common_handle_output);
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vvc->trans_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
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vhost_vsock_common_handle_output);
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/* The event queue belongs to QEMU */
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vvc->event_vq = virtio_add_queue(vdev, VHOST_VSOCK_QUEUE_SIZE,
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vhost_vsock_common_handle_output);
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vvc->vhost_dev.nvqs = ARRAY_SIZE(vvc->vhost_vqs);
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vvc->vhost_dev.vqs = vvc->vhost_vqs;
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vvc->post_load_timer = NULL;
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}
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void vhost_vsock_common_unrealize(VirtIODevice *vdev)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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vhost_vsock_common_post_load_timer_cleanup(vvc);
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virtio_delete_queue(vvc->recv_vq);
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virtio_delete_queue(vvc->trans_vq);
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virtio_delete_queue(vvc->event_vq);
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virtio_cleanup(vdev);
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}
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static void vhost_vsock_common_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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vdc->guest_notifier_mask = vhost_vsock_common_guest_notifier_mask;
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vdc->guest_notifier_pending = vhost_vsock_common_guest_notifier_pending;
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}
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static const TypeInfo vhost_vsock_common_info = {
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.name = TYPE_VHOST_VSOCK_COMMON,
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.parent = TYPE_VIRTIO_DEVICE,
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.instance_size = sizeof(VHostVSockCommon),
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.class_init = vhost_vsock_common_class_init,
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.abstract = true,
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};
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static void vhost_vsock_common_register_types(void)
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{
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type_register_static(&vhost_vsock_common_info);
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}
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type_init(vhost_vsock_common_register_types)
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