Did you change any BIOS setting recently?
I had host crashes with WIn10 VM while installing AMD Radeon driver inside VM. I don’t know exactly what the issue ws but I was able to fix it by disabling
“Above 4G memory / Crypto Currency mining” option in BIOS
Motherboard: MSI B550 Tomahawk
Host GPU: RX550
Guest GPU: 6800XT
Not sure if it is applied to your case