Hi, This is a followup to my original PCI passthrough issue, which has been resolved, though not as smoothly as I would like. Here is a brief recap: I am using PCI passthrough to a VM with an Ath9k wifi adapter. This was causing my host machine to lock up/freeze when starting the VM. Adding a line to drivers/pci/quirks.c resolve the issue. Here is the original thread: https://marc.info/?l=linux-wireless&m=154689580213002&w=2 By "resolved" I mean the host doesn't lock up, but I am still seeing weird behavior. When starting the VM I see this: qemu-system-x86_64: vfio-pci: Cannot read device rom at 0000:08:00.0 Device option ROM contents are probably invalid (check dmesg). Skip option ROM probe with rombar=0, or load from file with romfile= [ 5.312843] irq 11: nobody cared (try booting with the "irqpoll" option) [ 5.312843] handlers: [ 5.312843] [<0000000002e29ed0>] vp_interrupt [ 5.312843] [<00000000d9d80d45>] ath_isr [ 5.312843] Disabling IRQ #11 At this point it hangs for a minute or two, sometimes re-printing the same "irq 11: nobody cared" message with a stack trace (sometimes up to 3 times). But eventually it boots into the VM and the adapter appears to work as expected. I have tried to get rid of the ROM contents print by adding "rombar=0", which didn't seem to change anything. Similarly I tried "irqpoll" which again didn't change the behavior (note both changes were on the guest kernel boot, not host). I don't see any such prints in my host kernel log during boot, so it seems to be specific to PCI passthrough. Since the adapter appears to work I could care less about these prints, I am just hoping to resolve the 1-2min hang when booting the VM. Thanks, James
