Comment 47 for bug 1580459

I was also experiencing the host hard locking when shutting down a Windows 10 guest with a Nvidia GPU passed-through, but the issue appears to be completely solved after switching the card to MSI mode in the Windows guest.

However, I would be interested in understanding *why* using the card in line-interrupt mode in the guest causes the host to lockup when the guest relinquishes control of the device. Is it a bug in qemu or vfio, or even the Linux kernel?

I don't know if its relevant, but I've noticed when the card is not being used by the guest it is listed as MSI: Enable- by lspci, suggesting that vfio is keeping the card in line-interrupt mode when not in use.