[libvirt-users] Debugging Windows 10 Guest Flakiness

Hello, I'm not sure if I'm asking this question in the right place, so please redirect me if there's a better list. I recently set up a Windows 10 guest on an Arch Linux host with libvirt and KVM/Qemu, using IOMMU to enable GPU passthrough. I followed this guide to set up the VM: https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF The problem that I'm having is that the guest is very flaky: sometimes the guest will just hang indefinitely, and sometimes the guest loses network connectivity. Usually when either of these behaviors happens, restarting the libvirtd daemon on the host resolves the issue, but that's not always true, and sometimes when I restart libvirtd it causes my entire (host) machine to lock up! I have enabled log_output level 1 in /etc/libvirt/libvirtd.conf and have monitored the log file during one of these hangs, but I don't see any obvious errors or problems in the log file itself (and there's a lot of information to sort through, so I may have missed something). Some specifics about my setup: Motherboard: ASUS Sabertooth X79 CPU: Intel i7 4930K Host GPU: GeForce GT 730 Guest GPU: GeForce GTX 780 Virtual network interface: NAT with the virtio driver I'm *reasonably* confident that the problem is not with the GPU passthrough setup, as I'm able to run FurMark (a GPU burn-in tool) on the guest with no problems. However, I haven't yet been able to reliably reproduce the error at all, so I'm pretty much at a loss as to where to go from here. Can anyone on this list point me in a good direction to look, or have you seen anything like this before? I'm happy to provide debug logs or any other information that is helpful, as well. Thanks for your time, David