On Thu, Sep 07, 2023 at 01:55:46PM -0600, Alex Williamson wrote: > There's perhaps an argument whether userspace should compose this > device itself, for example finding the firmware attributes in sysfs and > directly mmap'ing the coherent memory via /dev/mem to back a virtual > BAR or otherwise pass-through this associated region. I don't think this works, secure boot turns off /dev/mem and other things that would let you do this AFAIK. > I've previously raised the point whether the coherent region here > might be exposed as a device specific region (such as we do for the > above IGD regions) rather than a virtual BAR, but the NVIDIA folks feel > strongly that the BAR approach is correct. I think it really depends on what the qemu side wants to do.. > Please continue the discussion, but I'm not seeing anything here that > feels significantly different than what we created vfio-pci variant > drivers to do. Right, the driver seems fine for what the infrastructure was created to do. Jason
