Overview of all resources in the cluster:
# pvesh get /cluster/resources
Status for all KVM VMs on a specific node:
# pvesh get /nodes/<NODENAME>/qemu
or a single VM:
# pvesh get /nodes/<NODENAME>/qemu/<VMID>/status/current
Would the nodes/<NODENAME>/qemu return an array of whatever /nodes/<NODENAME>/qemu/<VMID>/status/current would return?