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/*
* Based on vhost-user-input.c of QEMU project
*
* Copyright (c) 2022 Virtual Open Systems SAS.
*
* 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 <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <sys/param.h>
/* Project header files */
#include "vhost_user_input.h"
#ifdef DEBUG
#define DBG(...) printf("vhost-user-input: " __VA_ARGS__)
#else
#define DBG(...)
#endif /* DEBUG */
static int vhost_input_config_change(struct vhost_dev *dev)
{
DBG("vhost-user-input: unhandled backend config change\n");
return -1;
}
const VhostDevConfigOps config_ops = {
.vhost_dev_config_notifier = vhost_input_config_change,
};
static void vhost_input_change_active(VirtIOInput *vinput)
{
DBG("vhost_input_change_active(...)\n");
VhostUserInput *vhuinput = global_vdev->vhuinput;
if (vinput->active) {
vhost_user_backend_start(global_vdev);
} else {
vhost_user_backend_stop(global_vdev);
}
}
static void vhost_input_get_config(VirtIODevice *vdev, uint8_t *config_data)
{
DBG("vhost_input_get_config(...)\n");
VirtIOInput *vinput = vdev->vinput;
VhostUserInput *vhi = vdev->vhuinput;
int ret;
memset(config_data, 0, vinput->cfg_size);
ret = vhost_dev_get_config(vhi->vhost_dev, config_data, vinput->cfg_size);
if (ret) {
DBG("vhost_input_get_config failed\n");
return;
}
}
static void vhost_input_set_config(VirtIODevice *vdev,
const uint8_t *config_data)
{
DBG("vhost_input_set_config(...)\n");
VhostUserInput *vhi = vdev->vhuinput;
int ret;
ret = vhost_dev_set_config(vhi->vhost_dev, config_data,
0, sizeof(virtio_input_config),
VHOST_SET_CONFIG_TYPE_MASTER);
if (ret) {
DBG("vhost_input_set_config failed\n");
return;
}
virtio_notify_config(vdev);
}
static struct vhost_dev *vhost_input_get_vhost(VirtIODevice *vdev)
{
DBG("vhost_input_get_vhost(...)\n");
return vdev->vhuinput->vhost_dev;
}
static void vhost_input_class_init(VirtIODevice *vdev)
{
DBG("vhost_input_class_init(...)\n");
/* Comment out the following lines to get the local config */
vdev->vdev_class->get_config = vhost_input_get_config;
vdev->vdev_class->set_config = vhost_input_set_config;
vdev->vdev_class->get_vhost = vhost_input_get_vhost;
vdev->vhuinput->vdev_input->input_class->realize = vhost_user_input_realize;
vdev->vhuinput->vdev_input->input_class->change_active =
vhost_input_change_active;
vdev->vdev_class->update_mem_table = update_mem_table;
}
void vhost_user_input_init(VirtIODevice *vdev)
{
DBG("vhost_user_input_init(...)\n");
struct VirtIOInputClass *input_class = (struct VirtIOInputClass *)malloc(
sizeof(struct VirtIOInputClass));
VirtIOInput *vinput = (VirtIOInput *)malloc(sizeof(VirtIOInput));
VhostUserInput *vhuinput = (VhostUserInput *)malloc(sizeof(VhostUserInput));
vdev->vinput = vinput;
vdev->vinput->input_class = input_class;
vdev->vhuinput = vhuinput;
vdev->nvqs = &dev->nvqs;
vhuinput->vdev = vdev;
vhuinput->vhost_dev = dev;
vhuinput->vdev_input = vinput;
/*
* Call first the virtio_input class init to set up
* the basic functionality.
*/
virtio_input_class_init(vdev);
/* Then call the vhost_user class init */
vhost_input_class_init(vdev);
/* finally initialize the bus */
virtio_loopback_bus_init(vdev->vbus);
}
void vhost_user_input_realize()
{
int nvqs = 2; /* qemu choice: 2 */
DBG("vhost_user_input_realize()\n");
vhost_dev_set_config_notifier(global_vdev->vhuinput->vhost_dev,
&config_ops);
global_vdev->vhuinput->vdev_input->cfg_size =
sizeof_field(virtio_input_config, u);
global_vdev->vhuinput->vhost_dev->vq_index = 0;
global_vdev->vhuinput->vhost_dev->backend_features = 0;
global_vdev->vhuinput->vhost_dev->num_queues = nvqs;
global_vdev->vq = (struct VirtQueue *)malloc(
sizeof(struct VirtQueue) * nvqs);
global_vdev->vhuinput->vhost_dev->nvqs = nvqs;
global_vdev->vhuinput->vhost_dev->vqs = (struct vhost_virtqueue *)malloc(
sizeof(struct vhost_virtqueue) * nvqs);
vhost_dev_init(global_vdev->vhuinput->vhost_dev);
/* Pass the new obtained features */
global_vdev->host_features = global_vdev->vhuinput->vhost_dev->features;
}
void vhost_user_backend_start(VirtIODevice *vdev)
{
VirtioBus *k = vdev->vbus;
int ret, i;
DBG("vhost_user_backend_start(...)\n");
if (vdev->started) {
DBG("Device has already been started!\n");
return;
}
if (!k->set_guest_notifiers) {
DBG("binding does not support guest notifiers\n");
return;
}
ret = vhost_dev_enable_notifiers(vdev->vhuinput->vhost_dev, vdev);
if (ret < 0) {
DBG("vhost_dev_enable_notifiers failed!\n");
return;
}
DBG("k->set_guest_notifiers, nvqs: %d\n", vdev->vhuinput->vhost_dev->nvqs);
ret = k->set_guest_notifiers(vdev, vdev->vhuinput->vhost_dev->nvqs, true);
if (ret < 0) {
DBG("Error binding guest notifier\n");
}
vdev->vhuinput->vhost_dev->acked_features = vdev->guest_features;
ret = vhost_dev_start(vdev->vhuinput->vhost_dev, vdev);
if (ret < 0) {
DBG("Error start vhost dev\n");
return;
}
/*
* 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 < vdev->vhuinput->vhost_dev->nvqs; i++) {
vhost_virtqueue_mask(vdev->vhuinput->vhost_dev, vdev,
vdev->vhuinput->vhost_dev->vq_index + i, false);
}
vdev->started = true;
return;
}
void vhost_user_backend_stop(VirtIODevice *vdev)
{
DBG("vhost_user_backend_stop() not yet implemented\n");
}
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