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QEMU - Sharing folders between Linux Host and Windows Guest

05/13/2018

In this post we will take a quick look on how to share a folder between a Linux Host and a Windows Guest within a QEMU environment.

Startup Script

Samba

QEMU uses Samba for sharing folders and files between hosts and guests. We activate the Samba Server on the host using the -net user,smb=/absolute/path/to/folder switch.

windows-10.sh

We supply our guest withg 2 CPUs and 4GB of RAM. The complete startup script is as follows:

#!/bin/sh
exec qemu-system-x86_64 -enable-kvm \
        -cpu host \
        -smp 2 \
        -enable-kvm \
        -drive file=windows-10.img,if=virtio \
        -net nic -net user,hostname=windows10vm,smb=/absolute/path/to/folder \
        -m 4G \
        -monitor stdio \
        -name "windows" \
        $@

First Run

When running the guest for the first time, we have to install the virtio drivers for Windows. To achieve this on Arch-Linux we do a simple yaourt -S virtio-win and call our script as follows:

./windows-10.sh -boot d -drive file=/path/to/win/image.iso,media=cdrom -drive file=/usr/share/virtio/virtio-win.iso,media=cdrom

Now we have to install the appropriate driver for our system to recognize the HDDs.

Accessing Samba Shares

Mapping Network Drive

To easily map a network drive, we go to This PC and click on Map network drive:

Then, we put the hosts adress with a QEMU-suffix to the folder text box - \\10.0.2.4\qemu:

Click on finish and we have our connected Samba drive:

And this is it! Now we're ready to share files between our Linux Host and our Windows Guest and vice versa.

Conclusion

In this post we covered howto share files between virtual machines based on QEMU. We wrote a little startup script, which spawns a Samba Server and mapped a network drive to the share.