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virtio: add vhost-user-base and a generic vhost-user-device

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In theory we shouldn't need to repeat so much boilerplate to support
vhost-user backends. This provides a generic vhost-user-base QOM
object and a derived vhost-user-device for which the user needs to
provide the few bits of information that aren't currently provided by
the vhost-user protocol. This should provide a baseline implementation
from which the other vhost-user stub can specialise.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230710153522.3469097-8-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Bennée 2023-07-10 16:35:09 +01:00 • committed by Michael S. Tsirkin
parent f05356f84d
commit eee7780973
4 changed files with 443 additions and 0 deletions
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71
hw/virtio/vhost-user-device-pci.c Normal file
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/*
* Vhost-user generic virtio device PCI glue
*
* Copyright (c) 2023 Linaro Ltd
* Author: Alex Bennée <alex.bennee@linaro.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "hw/qdev-properties.h"
#include "hw/virtio/vhost-user-device.h"
#include "hw/virtio/virtio-pci.h"
struct VHostUserDevicePCI {
VirtIOPCIProxy parent_obj;
VHostUserBase vub;
};
typedef struct VHostUserDevicePCI VHostUserDevicePCI;
#define TYPE_VHOST_USER_DEVICE_PCI "vhost-user-device-pci-base"
DECLARE_INSTANCE_CHECKER(VHostUserDevicePCI,
VHOST_USER_DEVICE_PCI,
TYPE_VHOST_USER_DEVICE_PCI)
static void vhost_user_device_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
{
VHostUserDevicePCI *dev = VHOST_USER_DEVICE_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vub);
vpci_dev->nvectors = 1;
qdev_realize(vdev, BUS(&vpci_dev->bus), errp);
}
static void vhost_user_device_pci_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
k->realize = vhost_user_device_pci_realize;
set_bit(DEVICE_CATEGORY_INPUT, 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_COMMUNICATION_OTHER;
}
static void vhost_user_device_pci_instance_init(Object *obj)
{
VHostUserDevicePCI *dev = VHOST_USER_DEVICE_PCI(obj);
virtio_instance_init_common(obj, &dev->vub, sizeof(dev->vub),
TYPE_VHOST_USER_DEVICE);
}
static const VirtioPCIDeviceTypeInfo vhost_user_device_pci_info = {
.base_name = TYPE_VHOST_USER_DEVICE_PCI,
.non_transitional_name = "vhost-user-device-pci",
.instance_size = sizeof(VHostUserDevicePCI),
.instance_init = vhost_user_device_pci_instance_init,
.class_init = vhost_user_device_pci_class_init,
};
static void vhost_user_device_pci_register(void)
{
virtio_pci_types_register(&vhost_user_device_pci_info);
}
type_init(vhost_user_device_pci_register);