megaraid sas 8708em2

I have a Windows 10 VM that was working at some point earlier this year, that now will no longer boot. The host was running PVE 7.x when it last worked, but has received updates to PVE 8.3.1 in the intervening months. The OVMF(UEFI) doesn't show any of the disks any more. If I boot the Windows...