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Add vhost-user-backend

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Create a vhost-user-backend object that holds a connection to a
vhost-user backend (or "slave" process) and can be referenced from
virtio devices that support it. See later patches for input & gpu
usage.

Note: a previous iteration of this object made it user-creatable, and
allowed managed sub-process spawning, but that has been dropped for
now.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 20190503130034.24916-4-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Marc-André Lureau 2019-05-03 15:00:31 +02:00 • committed by Gerd Hoffmann
parent 78067fdef6
commit f24bb7287d
4 changed files with 270 additions and 0 deletions
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57
include/sysemu/vhost-user-backend.h Normal file
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/*
* QEMU vhost-user backend
*
* Copyright (C) 2018 Red Hat Inc
*
* Authors:
* Marc-André Lureau <marcandre.lureau@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_VHOST_USER_BACKEND_H
#define QEMU_VHOST_USER_BACKEND_H
#include "qom/object.h"
#include "exec/memory.h"
#include "qemu/option.h"
#include "qemu/bitmap.h"
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-user.h"
#include "chardev/char-fe.h"
#include "io/channel.h"
#define TYPE_VHOST_USER_BACKEND "vhost-user-backend"
#define VHOST_USER_BACKEND(obj) \
OBJECT_CHECK(VhostUserBackend, (obj), TYPE_VHOST_USER_BACKEND)
#define VHOST_USER_BACKEND_GET_CLASS(obj) \
OBJECT_GET_CLASS(VhostUserBackendClass, (obj), TYPE_VHOST_USER_BACKEND)
#define VHOST_USER_BACKEND_CLASS(klass) \
OBJECT_CLASS_CHECK(VhostUserBackendClass, (klass), TYPE_VHOST_USER_BACKEND)
typedef struct VhostUserBackend VhostUserBackend;
typedef struct VhostUserBackendClass VhostUserBackendClass;
struct VhostUserBackendClass {
ObjectClass parent_class;
};
struct VhostUserBackend {
/* private */
Object parent;
char *chr_name;
CharBackend chr;
VhostUserState vhost_user;
struct vhost_dev dev;
VirtIODevice *vdev;
bool started;
bool completed;
};
int vhost_user_backend_dev_init(VhostUserBackend *b, VirtIODevice *vdev,
unsigned nvqs, Error **errp);
void vhost_user_backend_start(VhostUserBackend *b);
void vhost_user_backend_stop(VhostUserBackend *b);
#endif