[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v3 4/6] vduse-blk: implements vduse-blk export
From: |
Eric Blake |
Subject: |
Re: [PATCH v3 4/6] vduse-blk: implements vduse-blk export |
Date: |
Mon, 21 Mar 2022 08:25:14 -0500 |
User-agent: |
NeoMutt/20211029-454-6adf99 |
On Mon, Mar 21, 2022 at 03:14:37PM +0800, Xie Yongji wrote:
> 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>
> ---
Looking at just the QAPI:
> +++ b/qapi/block-export.json
> @@ -170,6 +170,22 @@
> '*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 128.
> +# @logical-block-size: Logical block size in bytes. Defaults to 512 bytes.
Any restrictions on this not being allowed to be smaller than 512, or
that it must be a power of 2, or that it has a maximum size? If so,
they should be documented.
> +#
> +# Since: 7.0
This is a new feature, and is too late for 7.0, so this line should
mention 7.1.
> +##
> +{ 'struct': 'BlockExportOptionsVduseBlk',
> + 'data': { '*num-queues': 'uint16',
> + '*queue-size': 'uint16',
> + '*logical-block-size': 'size'} }
> +
> ##
> # @NbdServerAddOptions:
> #
> @@ -273,6 +289,7 @@
> # @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 7.0)
Another spot for 7.1.
> #
> # Since: 4.2
> ##
> @@ -280,7 +297,8 @@
> '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:
> @@ -324,7 +342,9 @@
> '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' }
> } }
>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
- [PATCH v3 0/6] Support exporting BDSs via VDUSE, Xie Yongji, 2022/03/21
- [PATCH v3 1/6] block: Support passing NULL ops to blk_set_dev_ops(), Xie Yongji, 2022/03/21
- [PATCH v3 2/6] linux-headers: Add vduse.h, Xie Yongji, 2022/03/21
- [PATCH v3 4/6] vduse-blk: implements vduse-blk export, Xie Yongji, 2022/03/21
- Re: [PATCH v3 4/6] vduse-blk: implements vduse-blk export,
Eric Blake <=
- [PATCH v3 3/6] libvduse: Add VDUSE (vDPA Device in Userspace) library, Xie Yongji, 2022/03/21
- [PATCH v3 5/6] vduse-blk: Add vduse-blk resize support, Xie Yongji, 2022/03/21
- [PATCH v3 6/6] libvduse: Add support for reconnecting, Xie Yongji, 2022/03/21