qemu-kvm-rhev-2.9.0-8.el7.aarch64 does not have "CONFIG_USB=y" in "default-configs/aarch64-softmmu.mak". Therefore the source file "hw/usb/dev-hid.c" is not built into the aarch64 emulator, and it lacks the "usb-tablet" and "usb-kbd" devices.
Without USB human input devices, virtio-gpu-pci is useless, because the user won't be able to type, and to point n' click, while using the graphical display.
Please enable CONFIG_USB.
(Regarding host controllers, we already have CONFIG_USB_XHCI=y, from bug 1446570.)
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2017:3169