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title | description | published | date | tags | editor | dateCreated |
---|---|---|---|---|---|---|
Share a host directory with a guest using virtiofs | true | 2023-01-24T16:27:16.582Z | markdown | 2022-08-13T00:16:17.437Z |
Sharing a directory
As of January 2023, virtio-fs is only available for virtual machines managed by the system libvirt instance (
qemu:///system
) {.is-info}
As of January 2023, virtio-fs does not feature a read-only mode. Do not share a host directory with a untrusted guest. {.is-warning}
Virtio-fs, shorts for virtio shared filesystem, allows you to share a directory located on the host with a guest. It is designed to be fast and optimized for local usage, when the host and the guest are located on the same physical machine.
The guest
Edit XML configuration
- Memory backing needs to be added to the XML definition:
<domain type="kvm">
[...]
<memoryBacking>
<source type="memfb"/>
<access mode="shared/>"
</memoryBacking>
[...]
</domain>
- A filesystem device has to be added.
<domain type="kvm">
[...]
<devices>
[...]
<filesystem type="mount" accessmode="passthrough">
<driver type="virtiofs"/>
<source dir="/mnt/"> # The host directory to be shared with the guest
<target dir="share"/> # Contrary to what the name implies, this is the tag used inside the guest
</filesystem>
[...]
</devices>
[...]
</domain>
Mount the folder inside the guest
- Inside the guest VM, mount the folder using the following commmand to mount the
/mnt
host directory on the guest, using also the/mnt
point:
# mount -t virtiofs share /mnt/
Resources
- Official website: https://virtio-fs.gitlab.io/index.html#status
- In the context of a Windows guest: https://github.com/virtio-win/kvm-guest-drivers-windows/wiki/VirtIO-FS:-Shared-file-system