QEMU 2.8.0-r1 with vfio VGA passthrough on Gentoo 4.8.17-hardened-r2 hangs on Radeon RX 480 reset

I have Gentoo 4.8.17-hardened-r2 compiled for AMD64 running on an AMD FX 8350 CPU with an Asus M5A99X EVO R2.0 motherboard, and I have a QEMU 2.8.0-r1 VM with vfio PCI passthrough to an Asus AMD Radeon RX 480 DUAL video card, using Windows 10 Anniversary Edition as guest OS. Whenever my guest OS tries to do what I believe is a GPU disconnection, my entire VM hangs and keeps eating all the CPU cores I have assigned to it. This means I have to do many convoluted workarounds to install my display drivers, which happens rather often because Windows 10's rolling release model also happens to include the latest Radeon drivers. Recently I attempted to change my simulated motherboard from default to Q35 hoping to take advantage of the better PCIE support, and this resulted in a situation where I cannot work around this issue anymore and ended up forcefully having to at least find out why QEMU hangs when Windows 10 disconnects from my GPU.