On Wed, 03 Oct 2018 15:13:47 +0000 (GMT) Allen Dial <ad...@mac.com> wrote: > Questions: > 1. Is there a known command line, vfio, or grub statemnet that will > allow this passed through gpu to work after guest shutdown or resart > without requireing a state change of the host?
None that I'm aware of. > 2. Are vfio or qemu "quirks" items that can help in situations like > these and are "quirks" configurable or initializable somehow? There are numerous quirks in vfio and QEMU, and I encourage vendors to add more, but they're generally made to work automatically for the devices where they apply. We have some quirks for the older Bonaire and Hawaii AMD GPUs, but nothing for the more recent ones. IIRC there were some patches in the amdgpu driver to help reset the card, but that probably only helps for a Linux guest, or perhaps if you bind the device back to the amdgpu driver in the host. > 3. Is there a place where I can go to reference all of the vfio > related kernel options and or paramaters that can be set and is there > a description of each of the possible options/parameters and how to > use them? You can run modinfo on the vfio kernel options, there's not a lot there though. In QEMU you can see the device options via '-device vfio-pci,?'. In both cases, most of the options are for debugging, but ask for anything you're not sure of. QEMU doesn't provide a way to describe the options. In general, AMD folks tend to deny that there are reset issues, so except for the Bonaire/Hawaii quirks above where they admit there's a silicon issue, we haven't gotten much support for additional quirks. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
