I would like to do a 4K passthrough and have therefore set my IVSHMEM to 64 MB. However my “Max Frame Size” is only 29 MiB and I get the error
Memory frame size of 33177600 bytes exceeds maximum space available
Is the Max Frame Size something that’s limited by my GPU (GT 1030) or can I change this somehow?
That can be changed in Libvirt or QEMU, depending on which one you are using.
I think you have to completely shut down the VM before changes will take effect.
I changed it to 64MB in libvirt and it didn’t work, but I now set it to 128 MB and it works flawlessly 
Libvirt first gave me an error after changing the memory to 128 MB but it worked after deleting /dev/shm/looking-glass, recreating it by hitting “Apply” in virtmanager and then using the command from the wiki:
touch /dev/shm/looking-glass && chown <your user name>:kvm /dev/shm/looking-glass && chmod 660 /dev/shm/looking-glass
Maybe this help someone in the future with the same issue
If you are doing 4k, that sounds right.
The formula is:
width x height x 4 x 2 = total bytes
total bytes / 1024 / 1024 = total megabytes + 2 = final total
So for 4k that would be:
3840 x 2160 x 4 x 2 = total bytes
total bytes / 1024 / 1024 = 63.28mb + 2mb = 65.28 mb
Note that 65.28mb is larger than 64mb, so you need to round up to a size of 128mb
Yeah, I forgot the 2mb… I though the “total megabytes” was the value I’m supposed to enter in libvirt and therefore subtracted 2. Silly mistake