Qemu 6.2 breaks Looking Glass ivshmem KVMFR

Operating Systems & Open Source Looking Glass
1

Hello All,
Just wanted to give some heads up that it appears the Qemu 6.2 release breaks shared memory config for Looking Glass using ivshmem-plain.

Trying to run my windows VM gives this error:
error: internal error: qemu unexpectedly closed the monitor:

2021-12-18T15:25:11.382697Z qemu-system-x86_64: -device {“driver”:“pcie-root-port”,“port”:8,“chassis”:1,“id”:“pci.1”,“bus”:“pcie.0”,“multifunction”:true,“addr”:“0x1”}: PCI: slot 1 function 0 not available for pcie-root-port, in use by ivshmem-plain

reverting to qemu 6.1 runs fine.

2 Likes
2

The error you have here is not caused by ivshmem/qemu6.2 but rather a faulty launch configuration of QEMU. not availble for pcie-root-port means the bus number assignment given is already taken by your ivshmem-plane device, either libvirt is not ready for qemu 6.2, or needs updating, or your custom args/launch scripts are bugged.

3 Likes
3

The docs were just updated with a new way to set the KVMFR device in the XML that will solve this issue. Take a look here

3 Likes
4

Thanks!! The new syntax works.

5

Oh, good to know. Though, it is a bit frustrating they have us change the syntax like that.