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title: Share a host directory with a guest using virtiofs
description:
published: true
date: 2022-08-13T00:16:17.437Z
date: 2023-01-24T16:27:16.582Z
tags:
editor: markdown
dateCreated: 2022-08-13T00:16:17.437Z
---
# virtio-fs
# Sharing a directory
*to-be done*
> *As of January 2023, virtio-fs is only available for virtual machines managed by the system libvirt instance (`qemu:///system`)*
{.is-info}
* Memory backing needs to be added:
> *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](https://virtio-fs.gitlab.io/), 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">
@ -22,10 +32,10 @@ dateCreated: 2022-08-13T00:16:17.437Z
<access mode="shared/>"
</memoryBacking>
[...]
</domain>
</domain>
```
* Then a a directory can be shared using the following definition:
* A filesystem device has to be added.
```
<domain type="kvm">
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[...]
<filesystem type="mount" accessmode="passthrough">
<driver type="virtiofs"/>
<source dir="/mnt/"> # Host directory to be shared with the guest
<target dir="/mnt"/> # Directory on the guest
<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