qemu/hw/virtio/vdpa-dev.c

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/*
* Vhost Vdpa Device
*
* Copyright (c) Huawei Technologies Co., Ltd. 2022. All Rights Reserved.
*
* Authors:
* Longpeng <longpeng2@huawei.com>
*
* Largely based on the "vhost-user-blk-pci.c" and "vhost-user-blk.c"
* implemented by:
* Changpeng Liu <changpeng.liu@intel.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include <linux/vhost.h>
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "hw/qdev-core.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/virtio-access.h"
#include "hw/virtio/vdpa-dev.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
static void
vhost_vdpa_device_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
/* Nothing to do */
}
static uint32_t
vhost_vdpa_device_get_u32(int fd, unsigned long int cmd, Error **errp)
{
uint32_t val = (uint32_t)-1;
if (ioctl(fd, cmd, &val) < 0) {
error_setg(errp, "vhost-vdpa-device: cmd 0x%lx failed: %s",
cmd, strerror(errno));
}
return val;
}
static void vhost_vdpa_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VhostVdpaDevice *v = VHOST_VDPA_DEVICE(vdev);
struct vhost_vdpa_iova_range iova_range;
uint16_t max_queue_size;
struct vhost_virtqueue *vqs;
int i, ret;
if (!v->vhostdev) {
error_setg(errp, "vhost-vdpa-device: vhostdev are missing");
return;
}
v->vhostfd = qemu_open(v->vhostdev, O_RDWR, errp);
if (*errp) {
return;
}
v->vdpa.device_fd = v->vhostfd;
v->vdev_id = vhost_vdpa_device_get_u32(v->vhostfd,
VHOST_VDPA_GET_DEVICE_ID, errp);
if (*errp) {
goto out;
}
max_queue_size = vhost_vdpa_device_get_u32(v->vhostfd,
VHOST_VDPA_GET_VRING_NUM, errp);
if (*errp) {
goto out;
}
if (v->queue_size > max_queue_size) {
error_setg(errp, "vhost-vdpa-device: invalid queue_size: %u (max:%u)",
v->queue_size, max_queue_size);
goto out;
} else if (!v->queue_size) {
v->queue_size = max_queue_size;
}
v->num_queues = vhost_vdpa_device_get_u32(v->vhostfd,
VHOST_VDPA_GET_VQS_COUNT, errp);
if (*errp) {
goto out;
}
if (!v->num_queues || v->num_queues > VIRTIO_QUEUE_MAX) {
error_setg(errp, "invalid number of virtqueues: %u (max:%u)",
v->num_queues, VIRTIO_QUEUE_MAX);
goto out;
}
v->dev.nvqs = v->num_queues;
vqs = g_new0(struct vhost_virtqueue, v->dev.nvqs);
v->dev.vqs = vqs;
v->dev.vq_index = 0;
v->dev.vq_index_end = v->dev.nvqs;
v->dev.backend_features = 0;
v->started = false;
ret = vhost_vdpa_get_iova_range(v->vhostfd, &iova_range);
if (ret < 0) {
error_setg(errp, "vhost-vdpa-device: get iova range failed: %s",
strerror(-ret));
goto free_vqs;
}
v->vdpa.iova_range = iova_range;
ret = vhost_dev_init(&v->dev, &v->vdpa, VHOST_BACKEND_TYPE_VDPA, 0, NULL);
if (ret < 0) {
error_setg(errp, "vhost-vdpa-device: vhost initialization failed: %s",
strerror(-ret));
goto free_vqs;
}
v->config_size = vhost_vdpa_device_get_u32(v->vhostfd,
VHOST_VDPA_GET_CONFIG_SIZE,
errp);
if (*errp) {
goto vhost_cleanup;
}
/*
* Invoke .post_init() to initialize the transport-specific fields
* before calling virtio_init().
*/
if (v->post_init && v->post_init(v, errp) < 0) {
goto vhost_cleanup;
}
v->config = g_malloc0(v->config_size);
ret = vhost_dev_get_config(&v->dev, v->config, v->config_size, NULL);
if (ret < 0) {
error_setg(errp, "vhost-vdpa-device: get config failed");
goto free_config;
}
virtio_init(vdev, v->vdev_id, v->config_size);
v->virtqs = g_new0(VirtQueue *, v->dev.nvqs);
for (i = 0; i < v->dev.nvqs; i++) {
v->virtqs[i] = virtio_add_queue(vdev, v->queue_size,
vhost_vdpa_device_dummy_handle_output);
}
return;
free_config:
g_free(v->config);
vhost_cleanup:
vhost_dev_cleanup(&v->dev);
free_vqs:
g_free(vqs);
out:
qemu_close(v->vhostfd);
v->vhostfd = -1;
}
static void vhost_vdpa_device_unrealize(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
int i;
virtio_set_status(vdev, 0);
for (i = 0; i < s->num_queues; i++) {
virtio_delete_queue(s->virtqs[i]);
}
g_free(s->virtqs);
virtio_cleanup(vdev);
g_free(s->config);
g_free(s->dev.vqs);
vhost_dev_cleanup(&s->dev);
qemu_close(s->vhostfd);
s->vhostfd = -1;
}
static void
vhost_vdpa_device_get_config(VirtIODevice *vdev, uint8_t *config)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
memcpy(config, s->config, s->config_size);
}
static void
vhost_vdpa_device_set_config(VirtIODevice *vdev, const uint8_t *config)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
int ret;
ret = vhost_dev_set_config(&s->dev, s->config, 0, s->config_size,
VHOST_SET_CONFIG_TYPE_MASTER);
if (ret) {
error_report("set device config space failed");
return;
}
}
static uint64_t vhost_vdpa_device_get_features(VirtIODevice *vdev,
uint64_t features,
Error **errp)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
uint64_t backend_features = s->dev.features;
if (!virtio_has_feature(features, VIRTIO_F_IOMMU_PLATFORM)) {
virtio_clear_feature(&backend_features, VIRTIO_F_IOMMU_PLATFORM);
}
return backend_features;
}
static int vhost_vdpa_device_start(VirtIODevice *vdev, Error **errp)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
int i, ret;
if (!k->set_guest_notifiers) {
error_setg(errp, "binding does not support guest notifiers");
return -ENOSYS;
}
ret = vhost_dev_enable_notifiers(&s->dev, vdev);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error enabling host notifiers");
return ret;
}
ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, true);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error binding guest notifier");
goto err_host_notifiers;
}
s->dev.acked_features = vdev->guest_features;
ret = vhost_dev_start(&s->dev, vdev, false);
if (ret < 0) {
error_setg_errno(errp, -ret, "Error starting vhost");
goto err_guest_notifiers;
}
s->started = true;
/*
* 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 < s->dev.nvqs; i++) {
vhost_virtqueue_mask(&s->dev, vdev, i, false);
}
return ret;
err_guest_notifiers:
k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
err_host_notifiers:
vhost_dev_disable_notifiers(&s->dev, vdev);
return ret;
}
static void vhost_vdpa_device_stop(VirtIODevice *vdev)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
int ret;
if (!s->started) {
return;
}
s->started = false;
if (!k->set_guest_notifiers) {
return;
}
vhost_dev_stop(&s->dev, vdev, false);
ret = k->set_guest_notifiers(qbus->parent, s->dev.nvqs, false);
if (ret < 0) {
error_report("vhost guest notifier cleanup failed: %d", ret);
return;
}
vhost_dev_disable_notifiers(&s->dev, vdev);
}
static void vhost_vdpa_device_set_status(VirtIODevice *vdev, uint8_t status)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(vdev);
bool should_start = virtio_device_started(vdev, status);
Error *local_err = NULL;
int ret;
if (!vdev->vm_running) {
should_start = false;
}
if (s->started == should_start) {
return;
}
if (should_start) {
ret = vhost_vdpa_device_start(vdev, &local_err);
if (ret < 0) {
error_reportf_err(local_err, "vhost-vdpa-device: start failed: ");
}
} else {
vhost_vdpa_device_stop(vdev);
}
}
static Property vhost_vdpa_device_properties[] = {
DEFINE_PROP_STRING("vhostdev", VhostVdpaDevice, vhostdev),
DEFINE_PROP_UINT16("queue-size", VhostVdpaDevice, queue_size, 0),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_vhost_vdpa_device = {
.name = "vhost-vdpa-device",
.unmigratable = 1,
.minimum_version_id = 1,
.version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_VIRTIO_DEVICE,
VMSTATE_END_OF_LIST()
},
};
static void vhost_vdpa_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
device_class_set_props(dc, vhost_vdpa_device_properties);
dc->desc = "VDPA-based generic device assignment";
dc->vmsd = &vmstate_vhost_vdpa_device;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
vdc->realize = vhost_vdpa_device_realize;
vdc->unrealize = vhost_vdpa_device_unrealize;
vdc->get_config = vhost_vdpa_device_get_config;
vdc->set_config = vhost_vdpa_device_set_config;
vdc->get_features = vhost_vdpa_device_get_features;
vdc->set_status = vhost_vdpa_device_set_status;
}
static void vhost_vdpa_device_instance_init(Object *obj)
{
VhostVdpaDevice *s = VHOST_VDPA_DEVICE(obj);
device_add_bootindex_property(obj, &s->bootindex, "bootindex",
NULL, DEVICE(obj));
}
static const TypeInfo vhost_vdpa_device_info = {
.name = TYPE_VHOST_VDPA_DEVICE,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VhostVdpaDevice),
.class_init = vhost_vdpa_device_class_init,
.instance_init = vhost_vdpa_device_instance_init,
};
static void register_vhost_vdpa_device_type(void)
{
type_register_static(&vhost_vdpa_device_info);
}
type_init(register_vhost_vdpa_device_type);