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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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45
include/hw/virtio/vhost-user-device.h Normal file
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/*
* Vhost-user generic virtio device
*
* Copyright (c) 2023 Linaro Ltd
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef QEMU_VHOST_USER_DEVICE_H
#define QEMU_VHOST_USER_DEVICE_H
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-user.h"
#define TYPE_VHOST_USER_BASE "vhost-user-base"
OBJECT_DECLARE_TYPE(VHostUserBase, VHostUserBaseClass, VHOST_USER_BASE)
struct VHostUserBase {
VirtIODevice parent;
/* Properties */
CharBackend chardev;
uint16_t virtio_id;
uint32_t num_vqs;
/* State tracking */
VhostUserState vhost_user;
struct vhost_virtqueue *vhost_vq;
struct vhost_dev vhost_dev;
GPtrArray *vqs;
bool connected;
};
/* needed so we can use the base realize after specialisation
tweaks */
struct VHostUserBaseClass {
/*< private >*/
VirtioDeviceClass parent_class;
/*< public >*/
DeviceRealize parent_realize;
};
/* shared for the benefit of the derived pci class */
#define TYPE_VHOST_USER_DEVICE "vhost-user-device"
#endif /* QEMU_VHOST_USER_DEVICE_H */