alt Hacker NewsSo just to be clear, you have to boot up the physical machine with a kernel command-line argument to reserve some RAM for this to work? And the amount of RAM you reserve is for BAR memory? If you wanted multiple PCIem devices (can you do that?) you'd need to reserve RAM for each of them?
Hi! That's correct. We need a way to have a chunk of what Linux calls "Reserved" memory for the virtual BAR trick. Currently, PCIem only thinks about a single device (Since I first needed to have something that worked in order to check how feasible this all was), but there's planned support for multiple devices that can share a "Reserved" memory pool dynamically so you can have multiple BARs for multiple devices.