9p virtio - Revision history

Bsd: added categories

2015-05-31T13:39:31Z

added categories

← Older revision		Revision as of 09:39, 31 May 2015
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	That's it...now we can read/write files in that directory from either the host or the guest. (Note: likely to hit some issues w/ privileges since Fedora libvirt runs guests unprivileged and with SELinux confinement...careful use of chown, chmod and chcon should get it working).		That's it...now we can read/write files in that directory from either the host or the guest. (Note: likely to hit some issues w/ privileges since Fedora libvirt runs guests unprivileged and with SELinux confinement...careful use of chown, chmod and chcon should get it working).

			[[Category:Docs]][[Category:HowTo]]

Steil at 06:27, 1 August 2012

2012-08-01T06:27:18Z

← Older revision		Revision as of 02:27, 1 August 2012
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	# mkdir /tmp/host_files		# mkdir /tmp/host_files
	# mount -t 9p -~~otrans~~=virtio,version=9p2000.L hostshare /tmp/host_files		# mount -t 9p -o trans=virtio,version=9p2000.L hostshare /tmp/host_files

	That's it...now we can read/write files in that directory from either the host or the guest.		That's it...now we can read/write files in that directory from either the host or the guest.
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	# mkdir /tmp/host_files		# mkdir /tmp/host_files
	# mount -t 9p -~~otrans~~=virtio,version=9p2000.L /hostshare /tmp/host_files		# mount -t 9p -o trans=virtio,version=9p2000.L /hostshare /tmp/host_files

	That's it...now we can read/write files in that directory from either the host or the guest. (Note: likely to hit some issues w/ privileges since Fedora libvirt runs guests unprivileged and with SELinux confinement...careful use of chown, chmod and chcon should get it working).		That's it...now we can read/write files in that directory from either the host or the guest. (Note: likely to hit some issues w/ privileges since Fedora libvirt runs guests unprivileged and with SELinux confinement...careful use of chown, chmod and chcon should get it working).

Chrisw at 00:08, 16 September 2011

2011-09-16T00:08:00Z

New page

== Example Sharing Host files with the Guest ==

This example is based on qemu-kvm (0.15.0) as installed in Fedora 15.
Will first show how to do this manually, and second how to do it using the virt-manager tool. This HOWTO is documenting 9p virtio as the transport for sharing files.

In both cases we'll share files in /tmp/share on the host. In the guest, they'll show up in /tmp/host_files.

== Manually, using qemu-kvm command line ==

There are a nice set of details on the [http://wiki.qemu.org/Documentation/9psetup QEMU wiki] describing this, so this section will be quite short. To share host files w/ the guest, we use 9p over virtio in conjunction w/ a filesystem device exporting the portion of the host filesystem that we'd like to share with the guest.

# /usr/bin/qemu-kvm -m 1024 -name f15 -drive file=/images/f15.img,if=virtio
-fsdev local,security_model=passthrough,id=fsdev0,path=/tmp/share -device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare

This tells qemu to create a 9pvirtio device exposing the mount_tag <code>hostshare</code> (just a name to identify the mount point). That device is coupled to an fsdev named <code>fsdev0</code>, which specifies which portion of the host filesystem we are sharing, and in which mode (see [http://wiki.qemu.org/Documentation/9psetup QEMU wiki] for details on the security models).

Now, in the guest we need to mount the 9p filesystem from the host using the virtio transport. The mount_tag is used to identify the host's share.

# mkdir /tmp/host_files
# mount -t 9p -otrans=virtio,version=9p2000.L hostshare /tmp/host_files

That's it...now we can read/write files in that directory from either the host or the guest.

== Managed, using virt-manager ==

This assumes you've already installed a guest with virt-manager or virt-install and it's shut off.

Start virt-manager, and open your VM by double clicking on it. Click the virtual hardware details (lightbulb). Click Add Hardware, and choose a Filesystem. Chose the mode, we chose squash which translates to none (see [http://wiki.qemu.org/Documentation/9psetup QEMU wiki] for details on the security models), the source (we are sharing /tmp/share), and the target (we called this /hostshare).

[[Image:Screenshot-add-filesystem-share.png]]

Now, start the VM. In the guest we need to mount the 9p filesystem from the host using the virtio transport. The mount_tag is used to identify the host's share.

# mkdir /tmp/host_files
# mount -t 9p -otrans=virtio,version=9p2000.L /hostshare /tmp/host_files

That's it...now we can read/write files in that directory from either the host or the guest. (Note: likely to hit some issues w/ privileges since Fedora libvirt runs guests unprivileged and with SELinux confinement...careful use of chown, chmod and chcon should get it working).