Arch Linux

Description:
Updating to linux 5.8.1.arch1-1 has caused a Windows VM being operated through libvirt/QEMU to bluescreen on start (see screenshot)
VM is known good and booting, using linux-lts 5.4.58-1 allows VM to boot properly. This issue is new as of 5.8, 5.7 did not have this issue for me.

Quick google search failed to find any mention upstream, or anywhere else. I did find mention of a similar issue to do with Zen 2 and a
speculative execution bug of some sort relating specifically to Zen 2 chips (which I am using).

Additional info:
CPU: Ryzen 9 3950X
Motherboard: GIGABYTE X570 AORUS ELITE WIFI
libvirt version: libvirt 6.5.0-1
QEMU version: qemu 5.1.0-1
virt-manager version: virt-manager 2.2.1-2
Windows 10 Version: Pro 2004, Build 19041.450

Steps to reproduce:
AMD Zen 2 CPU may be required to reproduce this bug

Prepare a Windows 10 VM using QEMU/KVM using libvirt and virt-manager, 8 vCPUs (4 cores, SMT2 configured topology), 16GB RAM, virtio storage and network, Q35, OVMF EFI

Install and boot linux 5.8.1.arch1-1 (if not already) and boot the Windows 10 VM, a BSoD will occur with stop code "KERNEL SECURITY CHECK FAILURE" (see screenshot)

Install and boot linux-lts 5.4.58-1 and boot the Windows 10 VM, it will boot up without problem.