I have an Windows XP SP3 VM up and running except I don't know what to use for the VGA driver. I successfully used virtio drives for the ethernet, PCI device, and PCI simple comm. controller, but none of the virtio drivers will work for the VGA. I'm passing through an integrated graphics Intel HD 630, i3-7100 CPU

You would use the driver for the integrated graphics.  But I doubt Intel created much less supports that on XP.   Google will be your friend.

Kaby Lake and newer CPUs only supported by Windows 10 per Microsoft announcement in April of 2017.  Your last option for XP support would probably have been 1155 chipset which was Sandy/Ivy Bridge.  Maybe some 1150 boards/CPUs.  Can always get an add-on GPU that meets your needs and pass it through.

Thanks, that makes sense. For some reason I was thinking that since I used the virtio drivers for everything else, that I would use them for the graphics as well.