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conf: add ability to configure a vdpa block disk device

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vDPA block devices can be configured as follows:

    <disk type='vhostvdpa'>
      <source dev='/dev/vhost-vdpa-0'/>
    </disk>

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jonathon Jongsma
2023-02-06 14:20:01 -06:00
parent 78862b67e1
commit 1df106cc20
13 changed files with 63 additions and 3 deletions
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19
docs/formatdomain.rst
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@@ -2678,6 +2678,11 @@ paravirtualized driver is specified via the ``disk`` element.
</source>
<target dev='vdf' bus='virtio'/>
</disk>
<disk type='vhostvdpa' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/vhost-vdpa-0' />
<target dev='vdg' bus='virtio'/>
</disk>
</devices>
...
@@ -2688,8 +2693,9 @@ paravirtualized driver is specified via the ``disk`` element.
``type``
Valid values are "file", "block", "dir" ( :since:`since 0.7.5` ),
"network" ( :since:`since 0.8.7` ), or "volume" ( :since:`since 1.0.5` ),
or "nvme" ( :since:`since 6.0.0` ), or "vhostuser" ( :since:`since 7.1.0` )
and refer to the underlying source for the disk. :since:`Since 0.0.3`
or "nvme" ( :since:`since 6.0.0` ), or "vhostuser" ( :since:`since 7.1.0` ),
or "vhostvdpa" ( :since:`since 9.8.0 (QEMU 8.1.0)`) and refer to the
underlying source for the disk. :since:`Since 0.0.3`
``device``
Indicates how the disk is to be exposed to the guest OS. Possible values
for this attribute are "floppy", "disk", "cdrom", and "lun", defaulting to
@@ -2879,6 +2885,15 @@ paravirtualized driver is specified via the ``disk`` element.
``<disk>`` XML for this disk type. Additionally features such as blockjobs,
incremental backups and snapshots are not supported for this disk type.
``vhostvdpa``
Enables the hypervisor to connect to a vDPA block device. Requires shared
memory configured for the VM, for more details see ``access`` mode for
``memoryBacking`` element (See `Memory Backing`_).
The ``source`` element has a mandatory attribute ``dev`` that specifies
the fully-qualified path to the vhost-vdpa character device (e.g.
``/dev/vhost-vdpa-0``).
With "file", "block", and "volume", one or more optional sub-elements
``seclabel`` (See `Security label`_) can be used to override the domain
security labeling policy for just that source file.