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virtio: Add vhost-user-rtc and vhost-user-rtc-pci

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Authored solely by me for Panasonic Automotive Systems Co., Ltd., but
based on existing vhost-user devices I wrote in 2025, so the copyright
is mixed.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260416-vhost-user-rtc-v2-1-100a53bfc6ce@linaro.org
Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
This commit is contained in:
Manos Pitsidianakis
2025-10-24 21:35:30 +03:00
parent edcc429e9e
commit e331d3089e
7 changed files with 173 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
MAINTAINERS
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@@ -2586,6 +2586,12 @@ S: Maintained
F: include/hw/virtio/vhost-user-spi.h
F: hw/virtio/vhost-user-spi*
vhost-user-rtc
M: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
S: Supported
F: include/hw/virtio/vhost-user-rtc.h
F: hw/virtio/vhost-user-rtc*
virtio-crypto
M: Gonglei <arei.gonglei@huawei.com>
S: Supported

3
docs/system/devices/virtio/vhost-user.rst
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@@ -61,6 +61,9 @@ platform details for what sort of virtio bus to use.
* - vhost-user-spi
- Proxy spi devices to host
- `vhost-device-spi <https://github.com/rust-vmm/vhost-device/tree/main/vhost-device-spi>`_
* - vhost-user-rtc
- Real time clock
- `vhost-device-rtc <https://github.com/rust-vmm/vhost-device/tree/main/vhost-device-rtc>`_
The referenced *daemons* are not exhaustive, any conforming backend
implementing the device and using the vhost-user protocol should work.

5
hw/virtio/Kconfig
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@@ -136,3 +136,8 @@ config VHOST_USER_TEST
bool
default y
depends on VIRTIO && VHOST_USER
config VHOST_USER_RTC
bool
default y
depends on VIRTIO && VHOST_USER

3
hw/virtio/meson.build
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@@ -27,6 +27,7 @@ if have_vhost
system_virtio_ss.add(when: 'CONFIG_VHOST_USER_SND', if_true: files('vhost-user-snd.c'))
system_virtio_ss.add(when: 'CONFIG_VHOST_USER_INPUT', if_true: files('vhost-user-input.c'))
system_virtio_ss.add(when: 'CONFIG_VHOST_USER_SPI', if_true: files('vhost-user-spi.c'))
system_virtio_ss.add(when: 'CONFIG_VHOST_USER_RTC', if_true: files('vhost-user-rtc.c'))
# PCI Stubs
system_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_TEST'],
@@ -43,6 +44,8 @@ if have_vhost
if_true: files('vhost-user-input-pci.c'))
system_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_SPI'],
if_true: files('vhost-user-spi-pci.c'))
system_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_RTC'],
if_true: files('vhost-user-rtc-pci.c'))
endif
if have_vhost_vdpa
system_virtio_ss.add(files('vhost-vdpa.c'))

70
hw/virtio/vhost-user-rtc-pci.c Normal file
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@@ -0,0 +1,70 @@
/*
* Vhost-user RTC virtio device PCI glue
*
* Copyright (c) 2025 Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
* Copyright 2026 Panasonic Automotive Systems Co., Ltd.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "hw/virtio/vhost-user-rtc.h"
#include "hw/virtio/virtio-pci.h"
struct VHostUserRTCPCI {
VirtIOPCIProxy parent_obj;
VHostUserRTC vdev;
};
typedef struct VHostUserRTCPCI VHostUserRTCPCI;
#define TYPE_VHOST_USER_RTC_PCI "vhost-user-rtc-pci-base"
DECLARE_INSTANCE_CHECKER(VHostUserRTCPCI, VHOST_USER_RTC_PCI,
TYPE_VHOST_USER_RTC_PCI)
static void vhost_user_rtc_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VHostUserRTCPCI *dev = VHOST_USER_RTC_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
vpci_dev->nvectors = 1;
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
}
static void vhost_user_rtc_pci_class_init(ObjectClass *klass, const void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
k->realize = vhost_user_rtc_pci_realize;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
pcidev_k->device_id = 0; /* Set by virtio-pci based on virtio id */
pcidev_k->revision = 0x00;
pcidev_k->class_id = PCI_CLASS_SYSTEM_RTC;
}
static void vhost_user_rtc_pci_instance_init(Object *obj)
{
VHostUserRTCPCI *dev = VHOST_USER_RTC_PCI(obj);
virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
TYPE_VHOST_USER_RTC);
}
static const VirtioPCIDeviceTypeInfo vhost_user_rtc_pci_info = {
.base_name = TYPE_VHOST_USER_RTC_PCI,
.non_transitional_name = "vhost-user-rtc-pci",
.instance_size = sizeof(VHostUserRTCPCI),
.instance_init = vhost_user_rtc_pci_instance_init,
.class_init = vhost_user_rtc_pci_class_init,
};
static void vhost_user_rtc_pci_register(void)
{
virtio_pci_types_register(&vhost_user_rtc_pci_info);
}
type_init(vhost_user_rtc_pci_register);

64
hw/virtio/vhost-user-rtc.c Normal file
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@@ -0,0 +1,64 @@
/*
* Vhost-user RTC virtio device
*
* Copyright (c) 2025 Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
* Copyright 2026 Panasonic Automotive Systems Co., Ltd.
*
* Simple wrapper of the generic vhost-user-device.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/virtio/vhost-user-rtc.h"
#include "standard-headers/linux/virtio_ids.h"
static const VMStateDescription vu_rtc_vmstate = {
.name = "vhost-user-rtc",
.unmigratable = 1,
};
static const Property vrtc_properties[] = {
DEFINE_PROP_CHR("chardev", VHostUserBase, chardev),
};
static void vu_rtc_base_realize(DeviceState *dev, Error **errp)
{
VHostUserBase *vub = VHOST_USER_BASE(dev);
VHostUserBaseClass *vubs = VHOST_USER_BASE_GET_CLASS(dev);
vub->virtio_id = VIRTIO_ID_CLOCK;
vub->num_vqs = 2;
vub->config_size = 0;
vub->vq_size = 1024;
vubs->parent_realize(dev, errp);
}
static void vu_rtc_class_init(ObjectClass *klass, const void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass);
dc->vmsd = &vu_rtc_vmstate;
device_class_set_props(dc, vrtc_properties);
device_class_set_parent_realize(dc, vu_rtc_base_realize,
&vubc->parent_realize);
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo vu_rtc_info = {
.name = TYPE_VHOST_USER_RTC,
.parent = TYPE_VHOST_USER_BASE,
.instance_size = sizeof(VHostUserRTC),
.class_init = vu_rtc_class_init,
};
static void vu_rtc_register_types(void)
{
type_register_static(&vu_rtc_info);
}
type_init(vu_rtc_register_types)

22
include/hw/virtio/vhost-user-rtc.h Normal file
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@@ -0,0 +1,22 @@
/*
* Vhost-user RTC virtio device
*
* Copyright (c) 2025 Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
* Copyright 2026 Panasonic Automotive Systems Co., Ltd.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef QEMU_VHOST_USER_RTC_H
#define QEMU_VHOST_USER_RTC_H
#include "hw/virtio/vhost-user-base.h"
#define TYPE_VHOST_USER_RTC "vhost-user-rtc"
OBJECT_DECLARE_SIMPLE_TYPE(VHostUserRTC, VHOST_USER_RTC)
struct VHostUserRTC {
VHostUserBase parent_obj;
};
#endif /* QEMU_VHOST_USER_RTC_H */