hw/virtio: Add boilerplate for vhost-user-scmi device

This creates the QEMU side of the vhost-user-scmi device which connects to
the remote daemon.  It is based on code of similar vhost-user devices.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Message-Id: <20230628100524.342666-2-mzamazal@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Milan Zamazal 2023-06-28 12:05:22 +02:00 committed by Michael S. Tsirkin
parent 31f137e3d6
commit a5dab090e1
5 changed files with 348 additions and 0 deletions

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@ -2217,6 +2217,12 @@ F: hw/virtio/vhost-user-gpio*
F: include/hw/virtio/vhost-user-gpio.h
F: tests/qtest/libqos/virtio-gpio.*
vhost-user-scmi
R: mzamazal@redhat.com
S: Supported
F: hw/virtio/vhost-user-scmi*
F: include/hw/virtio/vhost-user-scmi.h
virtio-crypto
M: Gonglei <arei.gonglei@huawei.com>
S: Supported

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@ -96,3 +96,8 @@ config VHOST_VDPA_DEV
bool
default y
depends on VIRTIO && VHOST_VDPA && LINUX
config VHOST_USER_SCMI
bool
default y
depends on VIRTIO && VHOST_USER

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@ -35,6 +35,7 @@ specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhost-user
specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhost-user-rng.c'))
specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_GPIO', if_true: files('vhost-user-gpio.c'))
specific_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_GPIO'], if_true: files('vhost-user-gpio-pci.c'))
specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_SCMI', if_true: files('vhost-user-scmi.c'))
virtio_pci_ss = ss.source_set()
virtio_pci_ss.add(when: 'CONFIG_VHOST_VSOCK', if_true: files('vhost-vsock-pci.c'))

306
hw/virtio/vhost-user-scmi.c Normal file
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@ -0,0 +1,306 @@
/*
* Vhost-user SCMI virtio device
*
* SPDX-FileCopyrightText: Red Hat, Inc.
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Implementation based on other vhost-user devices in QEMU.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/virtio/virtio-bus.h"
#include "hw/virtio/vhost-user-scmi.h"
#include "standard-headers/linux/virtio_ids.h"
#include "standard-headers/linux/virtio_scmi.h"
#include "trace.h"
/*
* In this version, we don't support VIRTIO_SCMI_F_SHARED_MEMORY.
* Note that VIRTIO_SCMI_F_SHARED_MEMORY is currently not supported in
* Linux VirtIO SCMI guest driver.
*/
static const int feature_bits[] = {
VIRTIO_F_VERSION_1,
VIRTIO_F_NOTIFY_ON_EMPTY,
VIRTIO_RING_F_INDIRECT_DESC,
VIRTIO_RING_F_EVENT_IDX,
VIRTIO_F_RING_RESET,
VIRTIO_SCMI_F_P2A_CHANNELS,
VHOST_INVALID_FEATURE_BIT
};
static int vu_scmi_start(VirtIODevice *vdev)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
struct vhost_dev *vhost_dev = &scmi->vhost_dev;
int ret, i;
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return -ENOSYS;
}
ret = vhost_dev_enable_notifiers(vhost_dev, vdev);
if (ret < 0) {
error_report("Error enabling host notifiers: %d", ret);
return ret;
}
ret = k->set_guest_notifiers(qbus->parent, vhost_dev->nvqs, true);
if (ret < 0) {
error_report("Error binding guest notifier: %d", ret);
goto err_host_notifiers;
}
vhost_ack_features(&scmi->vhost_dev, feature_bits, vdev->guest_features);
ret = vhost_dev_start(&scmi->vhost_dev, vdev, true);
if (ret < 0) {
error_report("Error starting vhost-user-scmi: %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 < scmi->vhost_dev.nvqs; i++) {
vhost_virtqueue_mask(&scmi->vhost_dev, vdev, i, false);
}
return 0;
err_guest_notifiers:
k->set_guest_notifiers(qbus->parent, vhost_dev->nvqs, false);
err_host_notifiers:
vhost_dev_disable_notifiers(vhost_dev, vdev);
return ret;
}
static void vu_scmi_stop(VirtIODevice *vdev)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
struct vhost_dev *vhost_dev = &scmi->vhost_dev;
int ret;
if (!k->set_guest_notifiers) {
return;
}
vhost_dev_stop(vhost_dev, vdev, true);
ret = k->set_guest_notifiers(qbus->parent, vhost_dev->nvqs, false);
if (ret < 0) {
error_report("vhost guest notifier cleanup failed: %d", ret);
return;
}
vhost_dev_disable_notifiers(vhost_dev, vdev);
}
static void vu_scmi_set_status(VirtIODevice *vdev, uint8_t status)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
bool should_start = virtio_device_should_start(vdev, status);
if (!scmi->connected) {
return;
}
if (vhost_dev_is_started(&scmi->vhost_dev) == should_start) {
return;
}
if (should_start) {
vu_scmi_start(vdev);
} else {
vu_scmi_stop(vdev);
}
}
static uint64_t vu_scmi_get_features(VirtIODevice *vdev, uint64_t features,
Error **errp)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
return vhost_get_features(&scmi->vhost_dev, feature_bits, features);
}
static void vu_scmi_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
/*
* Not normally called; it's the daemon that handles the queue;
* however virtio's cleanup path can call this.
*/
}
static void vu_scmi_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
if (idx == VIRTIO_CONFIG_IRQ_IDX) {
return;
}
vhost_virtqueue_mask(&scmi->vhost_dev, vdev, idx, mask);
}
static bool vu_scmi_guest_notifier_pending(VirtIODevice *vdev, int idx)
{
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
return vhost_virtqueue_pending(&scmi->vhost_dev, idx);
}
static void vu_scmi_connect(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
if (scmi->connected) {
return;
}
scmi->connected = true;
/* restore vhost state */
if (virtio_device_started(vdev, vdev->status)) {
vu_scmi_start(vdev);
}
}
static void vu_scmi_disconnect(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCMI *scmi = VHOST_USER_SCMI(vdev);
if (!scmi->connected) {
return;
}
scmi->connected = false;
if (vhost_dev_is_started(&scmi->vhost_dev)) {
vu_scmi_stop(vdev);
}
}
static void vu_scmi_event(void *opaque, QEMUChrEvent event)
{
DeviceState *dev = opaque;
switch (event) {
case CHR_EVENT_OPENED:
vu_scmi_connect(dev);
break;
case CHR_EVENT_CLOSED:
vu_scmi_disconnect(dev);
break;
case CHR_EVENT_BREAK:
case CHR_EVENT_MUX_IN:
case CHR_EVENT_MUX_OUT:
/* Ignore */
break;
}
}
static void do_vhost_user_cleanup(VirtIODevice *vdev, VHostUserSCMI *scmi)
{
virtio_delete_queue(scmi->cmd_vq);
virtio_delete_queue(scmi->event_vq);
g_free(scmi->vhost_dev.vqs);
virtio_cleanup(vdev);
vhost_user_cleanup(&scmi->vhost_user);
}
static void vu_scmi_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCMI *scmi = VHOST_USER_SCMI(dev);
int ret;
if (!scmi->chardev.chr) {
error_setg(errp, "vhost-user-scmi: chardev is mandatory");
return;
}
vdev->host_features |= (1ULL << VIRTIO_SCMI_F_P2A_CHANNELS);
if (!vhost_user_init(&scmi->vhost_user, &scmi->chardev, errp)) {
return;
}
virtio_init(vdev, VIRTIO_ID_SCMI, 0);
scmi->cmd_vq = virtio_add_queue(vdev, 256, vu_scmi_handle_output);
scmi->event_vq = virtio_add_queue(vdev, 256, vu_scmi_handle_output);
scmi->vhost_dev.nvqs = 2;
scmi->vhost_dev.vqs = g_new0(struct vhost_virtqueue, scmi->vhost_dev.nvqs);
ret = vhost_dev_init(&scmi->vhost_dev, &scmi->vhost_user,
VHOST_BACKEND_TYPE_USER, 0, errp);
if (ret < 0) {
error_setg_errno(errp, -ret,
"vhost-user-scmi: vhost_dev_init() failed");
do_vhost_user_cleanup(vdev, scmi);
return;
}
qemu_chr_fe_set_handlers(&scmi->chardev, NULL, NULL, vu_scmi_event, NULL,
dev, NULL, true);
return;
}
static void vu_scmi_device_unrealize(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VHostUserSCMI *scmi = VHOST_USER_SCMI(dev);
vu_scmi_set_status(vdev, 0);
vhost_dev_cleanup(&scmi->vhost_dev);
do_vhost_user_cleanup(vdev, scmi);
}
static const VMStateDescription vu_scmi_vmstate = {
.name = "vhost-user-scmi",
.unmigratable = 1,
};
static Property vu_scmi_properties[] = {
DEFINE_PROP_CHR("chardev", VHostUserSCMI, chardev),
DEFINE_PROP_END_OF_LIST(),
};
static void vu_scmi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
device_class_set_props(dc, vu_scmi_properties);
dc->vmsd = &vu_scmi_vmstate;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
vdc->realize = vu_scmi_device_realize;
vdc->unrealize = vu_scmi_device_unrealize;
vdc->get_features = vu_scmi_get_features;
vdc->set_status = vu_scmi_set_status;
vdc->guest_notifier_mask = vu_scmi_guest_notifier_mask;
vdc->guest_notifier_pending = vu_scmi_guest_notifier_pending;
}
static const TypeInfo vu_scmi_info = {
.name = TYPE_VHOST_USER_SCMI,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VHostUserSCMI),
.class_init = vu_scmi_class_init,
};
static void vu_scmi_register_types(void)
{
type_register_static(&vu_scmi_info);
}
type_init(vu_scmi_register_types)

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@ -0,0 +1,30 @@
/*
* Vhost-user SCMI virtio device
*
* Copyright (c) 2023 Red Hat, Inc.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef _QEMU_VHOST_USER_SCMI_H
#define _QEMU_VHOST_USER_SCMI_H
#include "hw/virtio/virtio.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-user.h"
#define TYPE_VHOST_USER_SCMI "vhost-user-scmi"
OBJECT_DECLARE_SIMPLE_TYPE(VHostUserSCMI, VHOST_USER_SCMI);
struct VHostUserSCMI {
VirtIODevice parent;
CharBackend chardev;
struct vhost_virtqueue *vhost_vqs;
struct vhost_dev vhost_dev;
VhostUserState vhost_user;
VirtQueue *cmd_vq;
VirtQueue *event_vq;
bool connected;
};
#endif /* _QEMU_VHOST_USER_SCMI_H */