As the question states. From my understanding KVM and Openstack both support PCI Passthrough. However, we have a compute node that will have multiple GPUs (8 GPUS in a single machine (same CPU bus)). Will openstack allow me to add this node as a compute node and assign VMs with multiple GPUs? In my case as an example, we will have 8GPUs on a single node. Can I create a VM1 with openstack/KVM and assign 4 GPUs to, make another VM2 with GPUs and then VM3 with 1GPU and then VM4 with 1GPU? Or any combination of that?

From my understanding KVM supports it on the that side of the question. https://www.pugetsystems.com/labs/articles/Multiheaded-NVIDIA-Gaming-using-Ubuntu-14-04-KVM-585/ (https://www.pugetsystems.com/labs/art...)