00343e4b54
This commit introduces a new vhost-user device for block, it uses a
chardev to connect with the backend, same with Qemu virito-blk device,
Guest OS still uses the virtio-blk frontend driver.
To use it, start QEMU with command line like this:
qemu-system-x86_64 \
-chardev socket,id=char0,path=/path/vhost.socket \
-device vhost-user-blk-pci,chardev=char0,num-queues=2, \
bootindex=2... \
Users can use different parameters for `num-queues` and `bootindex`.
Different with exist Qemu virtio-blk host device, it makes more easy
for users to implement their own I/O processing logic, such as all
user space I/O stack against hardware block device. It uses the new
vhost messages(VHOST_USER_GET_CONFIG) to get block virtio config
information from backend process.
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
42 lines
995 B
C
42 lines
995 B
C
/*
|
|
* vhost-user-blk host device
|
|
* Copyright(C) 2017 Intel Corporation.
|
|
*
|
|
* Authors:
|
|
* Changpeng Liu <changpeng.liu@intel.com>
|
|
*
|
|
* Based on vhost-scsi.h, Copyright IBM, Corp. 2011
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef VHOST_USER_BLK_H
|
|
#define VHOST_USER_BLK_H
|
|
|
|
#include "standard-headers/linux/virtio_blk.h"
|
|
#include "qemu-common.h"
|
|
#include "hw/qdev.h"
|
|
#include "hw/block/block.h"
|
|
#include "chardev/char-fe.h"
|
|
#include "hw/virtio/vhost.h"
|
|
|
|
#define TYPE_VHOST_USER_BLK "vhost-user-blk"
|
|
#define VHOST_USER_BLK(obj) \
|
|
OBJECT_CHECK(VHostUserBlk, (obj), TYPE_VHOST_USER_BLK)
|
|
|
|
typedef struct VHostUserBlk {
|
|
VirtIODevice parent_obj;
|
|
CharBackend chardev;
|
|
int32_t bootindex;
|
|
struct virtio_blk_config blkcfg;
|
|
uint16_t num_queues;
|
|
uint32_t queue_size;
|
|
uint32_t config_wce;
|
|
uint32_t config_ro;
|
|
struct vhost_dev dev;
|
|
} VHostUserBlk;
|
|
|
|
#endif
|