2a2359b844
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>
439 lines
13 KiB
Python
439 lines
13 KiB
Python
# -*- Mode: Python -*-
|
|
# vim: filetype=python
|
|
|
|
##
|
|
# == Block device exports
|
|
##
|
|
|
|
{ 'include': 'sockets.json' }
|
|
{ 'include': 'block-core.json' }
|
|
|
|
##
|
|
# @NbdServerOptions:
|
|
#
|
|
# Keep this type consistent with the nbd-server-start arguments. The only
|
|
# intended difference is using SocketAddress instead of SocketAddressLegacy.
|
|
#
|
|
# @addr: Address on which to listen.
|
|
# @tls-creds: ID of the TLS credentials object (since 2.6).
|
|
# @tls-authz: ID of the QAuthZ authorization object used to validate
|
|
# the client's x509 distinguished name. This object is
|
|
# is only resolved at time of use, so can be deleted and
|
|
# recreated on the fly while the NBD server is active.
|
|
# If missing, it will default to denying access (since 4.0).
|
|
# @max-connections: The maximum number of connections to allow at the same
|
|
# time, 0 for unlimited. Setting this to 1 also stops
|
|
# the server from advertising multiple client support
|
|
# (since 5.2; default: 0)
|
|
#
|
|
# Since: 4.2
|
|
##
|
|
{ 'struct': 'NbdServerOptions',
|
|
'data': { 'addr': 'SocketAddress',
|
|
'*tls-creds': 'str',
|
|
'*tls-authz': 'str',
|
|
'*max-connections': 'uint32' } }
|
|
|
|
##
|
|
# @nbd-server-start:
|
|
#
|
|
# Start an NBD server listening on the given host and port. Block
|
|
# devices can then be exported using @nbd-server-add. The NBD
|
|
# server will present them as named exports; for example, another
|
|
# QEMU instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
|
|
#
|
|
# Keep this type consistent with the NbdServerOptions type. The only intended
|
|
# difference is using SocketAddressLegacy instead of SocketAddress.
|
|
#
|
|
# @addr: Address on which to listen.
|
|
# @tls-creds: ID of the TLS credentials object (since 2.6).
|
|
# @tls-authz: ID of the QAuthZ authorization object used to validate
|
|
# the client's x509 distinguished name. This object is
|
|
# is only resolved at time of use, so can be deleted and
|
|
# recreated on the fly while the NBD server is active.
|
|
# If missing, it will default to denying access (since 4.0).
|
|
# @max-connections: The maximum number of connections to allow at the same
|
|
# time, 0 for unlimited. Setting this to 1 also stops
|
|
# the server from advertising multiple client support
|
|
# (since 5.2; default: 0).
|
|
#
|
|
# Returns: error if the server is already running.
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'command': 'nbd-server-start',
|
|
'data': { 'addr': 'SocketAddressLegacy',
|
|
'*tls-creds': 'str',
|
|
'*tls-authz': 'str',
|
|
'*max-connections': 'uint32' },
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @BlockExportOptionsNbdBase:
|
|
#
|
|
# An NBD block export (common options shared between nbd-server-add and
|
|
# the NBD branch of block-export-add).
|
|
#
|
|
# @name: Export name. If unspecified, the @device parameter is used as the
|
|
# export name. (Since 2.12)
|
|
#
|
|
# @description: Free-form description of the export, up to 4096 bytes.
|
|
# (Since 5.0)
|
|
#
|
|
# Since: 5.0
|
|
##
|
|
{ 'struct': 'BlockExportOptionsNbdBase',
|
|
'data': { '*name': 'str', '*description': 'str' } }
|
|
|
|
##
|
|
# @BlockExportOptionsNbd:
|
|
#
|
|
# An NBD block export (distinct options used in the NBD branch of
|
|
# block-export-add).
|
|
#
|
|
# @bitmaps: Also export each of the named dirty bitmaps reachable from
|
|
# @device, so the NBD client can use NBD_OPT_SET_META_CONTEXT with
|
|
# the metadata context name "qemu:dirty-bitmap:BITMAP" to inspect
|
|
# each bitmap.
|
|
# Since 7.1 bitmap may be specified by node/name pair.
|
|
#
|
|
# @allocation-depth: Also export the allocation depth map for @device, so
|
|
# the NBD client can use NBD_OPT_SET_META_CONTEXT with
|
|
# the metadata context name "qemu:allocation-depth" to
|
|
# inspect allocation details. (since 5.2)
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'struct': 'BlockExportOptionsNbd',
|
|
'base': 'BlockExportOptionsNbdBase',
|
|
'data': { '*bitmaps': ['BlockDirtyBitmapOrStr'],
|
|
'*allocation-depth': 'bool' } }
|
|
|
|
##
|
|
# @BlockExportOptionsVhostUserBlk:
|
|
#
|
|
# A vhost-user-blk block export.
|
|
#
|
|
# @addr: The vhost-user socket on which to listen. Both 'unix' and 'fd'
|
|
# SocketAddress types are supported. Passed fds must be UNIX domain
|
|
# sockets.
|
|
# @logical-block-size: Logical block size in bytes. Defaults to 512 bytes.
|
|
# @num-queues: Number of request virtqueues. Must be greater than 0. Defaults
|
|
# to 1.
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'struct': 'BlockExportOptionsVhostUserBlk',
|
|
'data': { 'addr': 'SocketAddress',
|
|
'*logical-block-size': 'size',
|
|
'*num-queues': 'uint16'} }
|
|
|
|
##
|
|
# @FuseExportAllowOther:
|
|
#
|
|
# Possible allow_other modes for FUSE exports.
|
|
#
|
|
# @off: Do not pass allow_other as a mount option.
|
|
#
|
|
# @on: Pass allow_other as a mount option.
|
|
#
|
|
# @auto: Try mounting with allow_other first, and if that fails, retry
|
|
# without allow_other.
|
|
#
|
|
# Since: 6.1
|
|
##
|
|
{ 'enum': 'FuseExportAllowOther',
|
|
'data': ['off', 'on', 'auto'] }
|
|
|
|
##
|
|
# @BlockExportOptionsFuse:
|
|
#
|
|
# Options for exporting a block graph node on some (file) mountpoint
|
|
# as a raw image.
|
|
#
|
|
# @mountpoint: Path on which to export the block device via FUSE.
|
|
# This must point to an existing regular file.
|
|
#
|
|
# @growable: Whether writes beyond the EOF should grow the block node
|
|
# accordingly. (default: false)
|
|
#
|
|
# @allow-other: If this is off, only qemu's user is allowed access to
|
|
# this export. That cannot be changed even with chmod or
|
|
# chown.
|
|
# Enabling this option will allow other users access to
|
|
# the export with the FUSE mount option "allow_other".
|
|
# Note that using allow_other as a non-root user requires
|
|
# user_allow_other to be enabled in the global fuse.conf
|
|
# configuration file.
|
|
# In auto mode (the default), the FUSE export driver will
|
|
# first attempt to mount the export with allow_other, and
|
|
# if that fails, try again without.
|
|
# (since 6.1; default: auto)
|
|
#
|
|
# Since: 6.0
|
|
##
|
|
{ 'struct': 'BlockExportOptionsFuse',
|
|
'data': { 'mountpoint': 'str',
|
|
'*growable': 'bool',
|
|
'*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:
|
|
#
|
|
# An NBD block export, per legacy nbd-server-add command.
|
|
#
|
|
# @device: The device name or node name of the node to be exported
|
|
#
|
|
# @writable: Whether clients should be able to write to the device via the
|
|
# NBD connection (default false).
|
|
#
|
|
# @bitmap: Also export a single dirty bitmap reachable from @device, so the
|
|
# NBD client can use NBD_OPT_SET_META_CONTEXT with the metadata
|
|
# context name "qemu:dirty-bitmap:BITMAP" to inspect the bitmap
|
|
# (since 4.0).
|
|
#
|
|
# Since: 5.0
|
|
##
|
|
{ 'struct': 'NbdServerAddOptions',
|
|
'base': 'BlockExportOptionsNbdBase',
|
|
'data': { 'device': 'str',
|
|
'*writable': 'bool', '*bitmap': 'str' } }
|
|
|
|
##
|
|
# @nbd-server-add:
|
|
#
|
|
# Export a block node to QEMU's embedded NBD server.
|
|
#
|
|
# The export name will be used as the id for the resulting block export.
|
|
#
|
|
# Features:
|
|
# @deprecated: This command is deprecated. Use @block-export-add instead.
|
|
#
|
|
# Returns: error if the server is not running, or export with the same name
|
|
# already exists.
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'command': 'nbd-server-add',
|
|
'data': 'NbdServerAddOptions', 'boxed': true, 'features': ['deprecated'],
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @BlockExportRemoveMode:
|
|
#
|
|
# Mode for removing a block export.
|
|
#
|
|
# @safe: Remove export if there are no existing connections, fail otherwise.
|
|
#
|
|
# @hard: Drop all connections immediately and remove export.
|
|
#
|
|
# TODO: Potential additional modes to be added in the future:
|
|
#
|
|
# hide: Just hide export from new clients, leave existing connections as is.
|
|
# Remove export after all clients are disconnected.
|
|
#
|
|
# soft: Hide export from new clients, answer with ESHUTDOWN for all further
|
|
# requests from existing clients.
|
|
#
|
|
# Since: 2.12
|
|
##
|
|
{'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']}
|
|
|
|
##
|
|
# @nbd-server-remove:
|
|
#
|
|
# Remove NBD export by name.
|
|
#
|
|
# @name: Block export id.
|
|
#
|
|
# @mode: Mode of command operation. See @BlockExportRemoveMode description.
|
|
# Default is 'safe'.
|
|
#
|
|
# Features:
|
|
# @deprecated: This command is deprecated. Use @block-export-del instead.
|
|
#
|
|
# Returns: error if
|
|
# - the server is not running
|
|
# - export is not found
|
|
# - mode is 'safe' and there are existing connections
|
|
#
|
|
# Since: 2.12
|
|
##
|
|
{ 'command': 'nbd-server-remove',
|
|
'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'},
|
|
'features': ['deprecated'],
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @nbd-server-stop:
|
|
#
|
|
# Stop QEMU's embedded NBD server, and unregister all devices previously
|
|
# added via @nbd-server-add.
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'command': 'nbd-server-stop',
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @BlockExportType:
|
|
#
|
|
# An enumeration of block export types
|
|
#
|
|
# @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
|
|
##
|
|
{ 'enum': 'BlockExportType',
|
|
'data': [ 'nbd',
|
|
{ 'name': 'vhost-user-blk',
|
|
'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
|
|
{ 'name': 'fuse', 'if': 'CONFIG_FUSE' },
|
|
{ 'name': 'vduse-blk', 'if': 'CONFIG_VDUSE_BLK_EXPORT' } ] }
|
|
|
|
##
|
|
# @BlockExportOptions:
|
|
#
|
|
# 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 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)
|
|
#
|
|
# @writable: True if clients should be able to write to the export
|
|
# (default false)
|
|
#
|
|
# @writethrough: If true, caches are flushed after every write request to the
|
|
# export before completion is signalled. (since: 5.2;
|
|
# default: false)
|
|
#
|
|
# @iothread: The name of the iothread object where the export will run. The
|
|
# default is to use the thread currently associated with the
|
|
# block node. (since: 5.2)
|
|
#
|
|
# @fixed-iothread: True prevents the block node from being moved to another
|
|
# thread while the export is active. If true and @iothread is
|
|
# given, export creation fails if the block node cannot be
|
|
# moved to the iothread. The default is false. (since: 5.2)
|
|
#
|
|
# Since: 4.2
|
|
##
|
|
{ 'union': 'BlockExportOptions',
|
|
'base': { 'type': 'BlockExportType',
|
|
'id': 'str',
|
|
'*fixed-iothread': 'bool',
|
|
'*iothread': 'str',
|
|
'node-name': 'str',
|
|
'*writable': 'bool',
|
|
'*writethrough': 'bool' },
|
|
'discriminator': 'type',
|
|
'data': {
|
|
'nbd': 'BlockExportOptionsNbd',
|
|
'vhost-user-blk': { 'type': 'BlockExportOptionsVhostUserBlk',
|
|
'if': 'CONFIG_VHOST_USER_BLK_SERVER' },
|
|
'fuse': { 'type': 'BlockExportOptionsFuse',
|
|
'if': 'CONFIG_FUSE' },
|
|
'vduse-blk': { 'type': 'BlockExportOptionsVduseBlk',
|
|
'if': 'CONFIG_VDUSE_BLK_EXPORT' }
|
|
} }
|
|
|
|
##
|
|
# @block-export-add:
|
|
#
|
|
# Creates a new block export.
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'command': 'block-export-add',
|
|
'data': 'BlockExportOptions', 'boxed': true,
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @block-export-del:
|
|
#
|
|
# Request to remove a block export. This drops the user's reference to the
|
|
# export, but the export may still stay around after this command returns until
|
|
# the shutdown of the export has completed.
|
|
#
|
|
# @id: Block export id.
|
|
#
|
|
# @mode: Mode of command operation. See @BlockExportRemoveMode description.
|
|
# Default is 'safe'.
|
|
#
|
|
# Returns: Error if the export is not found or @mode is 'safe' and the export
|
|
# is still in use (e.g. by existing client connections)
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'command': 'block-export-del',
|
|
'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' },
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @BLOCK_EXPORT_DELETED:
|
|
#
|
|
# Emitted when a block export is removed and its id can be reused.
|
|
#
|
|
# @id: Block export id.
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'event': 'BLOCK_EXPORT_DELETED',
|
|
'data': { 'id': 'str' } }
|
|
|
|
##
|
|
# @BlockExportInfo:
|
|
#
|
|
# Information about a single block export.
|
|
#
|
|
# @id: The unique identifier for the block export
|
|
#
|
|
# @type: The block export type
|
|
#
|
|
# @node-name: The node name of the block node that is exported
|
|
#
|
|
# @shutting-down: True if the export is shutting down (e.g. after a
|
|
# block-export-del command, but before the shutdown has
|
|
# completed)
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'struct': 'BlockExportInfo',
|
|
'data': { 'id': 'str',
|
|
'type': 'BlockExportType',
|
|
'node-name': 'str',
|
|
'shutting-down': 'bool' } }
|
|
|
|
##
|
|
# @query-block-exports:
|
|
#
|
|
# Returns: A list of BlockExportInfo describing all block exports
|
|
#
|
|
# Since: 5.2
|
|
##
|
|
{ 'command': 'query-block-exports', 'returns': ['BlockExportInfo'],
|
|
'allow-preconfig': true }
|