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vduse-blk: Implement vduse-blk export

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This implements a VDUSE block backends based on
the libvduse library. We can use it to export the BDSs
for both VM and container (host) usage.

The new command-line syntax is:

$ qemu-storage-daemon \
    --blockdev file,node-name=drive0,filename=test.img \
    --export vduse-blk,node-name=drive0,id=vduse-export0,writable=on

After the qemu-storage-daemon started, we need to use
the "vdpa" command to attach the device to vDPA bus:

$ vdpa dev add name vduse-export0 mgmtdev vduse

Also the device must be removed via the "vdpa" command
before we stop the qemu-storage-daemon.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20220523084611.91-7-xieyongji@bytedance.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Xie Yongji 2022-05-23 16:46:09 +08:00 • committed by Kevin Wolf
parent a6caeee811
commit 2a2359b844
9 changed files with 407 additions and 4 deletions
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28
qapi/block-export.json
View file

@ -178,6 +178,23 @@
'*allow-other': 'FuseExportAllowOther' },
'if': 'CONFIG_FUSE' }
##
# @BlockExportOptionsVduseBlk:
#
# A vduse-blk block export.
#
# @num-queues: the number of virtqueues. Defaults to 1.
# @queue-size: the size of virtqueue. Defaults to 256.
# @logical-block-size: Logical block size in bytes. Range [512, PAGE_SIZE]
# and must be power of 2. Defaults to 512 bytes.
#
# Since: 7.1
##
{ 'struct': 'BlockExportOptionsVduseBlk',
'data': { '*num-queues': 'uint16',
'*queue-size': 'uint16',
'*logical-block-size': 'size'} }
##
# @NbdServerAddOptions:
#
@ -284,6 +301,7 @@
# @nbd: NBD export
# @vhost-user-blk: vhost-user-blk export (since 5.2)
# @fuse: FUSE export (since: 6.0)
# @vduse-blk: vduse-blk export (since 7.1)
#
# Since: 4.2
##
@ -291,7 +309,8 @@
'data': [ 'nbd',
{ 'name': 'vhost-user-blk',
'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
{ 'name': 'fuse', 'if': 'CONFIG_FUSE' } ] }
{ 'name': 'fuse', 'if': 'CONFIG_FUSE' },
{ 'name': 'vduse-blk', 'if': 'CONFIG_VDUSE_BLK_EXPORT' } ] }
##
# @BlockExportOptions:
@ -299,7 +318,8 @@
# Describes a block export, i.e. how single node should be exported on an
# external interface.
#
# @id: A unique identifier for the block export (across all export types)
# @id: A unique identifier for the block export (across the host for vduse-blk
# export type or across all export types for other types)
#
# @node-name: The node name of the block node to be exported (since: 5.2)
#
@ -335,7 +355,9 @@
'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk',
'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
'fuse': { 'type': 'BlockExportOptionsFuse',
'if': 'CONFIG_FUSE' }
'if': 'CONFIG_FUSE' },
'vduse-blk': { 'type': 'BlockExportOptionsVduseBlk',
'if': 'CONFIG_VDUSE_BLK_EXPORT' }
} }
##