Hello everyone, this is my first time post this question at this mailing list. And I'm not so well in English, so apologize first if I got any sentence wrong or the question doesn't mean so well. OK, I'm now trying the KVMGT on QEMU and it works well even I didn't set any virtual display. For now KVMGT only can launch with QEMU command line, I know that libvirt didn't support it yet. So I have to set command line for KVMGT features in one of the shell script (i.e /usr/bin/kvm). The problem is, KVMGT set itself as VGA device, that means the default virtual PCI address gave from QEMU is 0000:00:02.0. If I set KVMGT feature command on shell script file (i.e -vga vgt), I will get this error while creating the VM from virt-manager. qemu-system-x86_64: -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2: PCI: slot 2 function 0 not available for virtio-balloon-pci, in use by vgt-vga qemu-system-x86_64: -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2: Device 'virtio-balloon-pci' could not be initialized So I have to create the VM without KVMGT first, then manually edit virtual PCI address to avoid 0000:00:02.0 But I want to make it automatically for each creation in some reasons. How can I do? And appreciate first for every reply. Many thanks, Eddie.