Configuring QEMU

Adding the IVSHMEM Virtual Device

This article assumes you already have a fully functional libvirt VM with PCI Passthrough working on a dedicated monitor. If you do not please ensure this is configured before you proceed.

If you are using libvirt, this does not apply to you.

Additional QEMU commands

Add the following to the commands to your QEMU command line, adjusting the bus to suit your particular configuration

-device ivshmem-plain,memdev=ivshmem,bus=pcie.0 \
-object memory-backend-file,id=ivshmem,share=on,mem-path=/dev/shm/looking-glass,size=32M

You will need to adjust the memory size to a value that is suitable for your desired maximum resolution using the following formula:

width x height x 4 x 2 = total bytes
total bytes / 1024 / 1024 = total megabytes + 2

For example, for a resolution of 1920x1080 (1080p)

1920 x 1080 x 4 x 2 = 16,588,800 bytes
16,588,800 / 1024 / 1024 = 15.82 MB + 2 = 17.82

You must round this value up to the nearest power of two, which with the above example would be 32MB

It is suggested that you create the shared memory file before starting the VM with the appropriate permissions for your system, this only needs to be done once at boot time, for example (this is a sample script only, do not use this without altering it for your requirements):

touch /dev/shm/looking-glass
chown user:kvm /dev/shm/looking-glass
chmod 660 /dev/shm/looking-glass

Support Looking Glass

Looking Glass is written and released open source by Geoffrey McRae.
If you would like to support this work he accepts donations on the following platforms: