[vfio-users] BSOD with the new Windows 10 ISO (1803)

[Berillions]

Hello,

With the new "Spring Update" from Microsoft for Windows 10, there are issue
when Ryzen users want to update their VM to Win10 1803 or install directly
from the ISO. I don't know if this issue exist for Intel CPUs.

For my case, if i set -cpu to "host-passthrough" and try to install Win10
1803, i have a BSOD when i boot on the DVD with this error message : *System
Thread Exception Not Handled*
I have the same thing if i install Win10 1709 and update the system to
1803, BSOD when i reboot.

The only solution which exist is to set -cpu to "Core2Duo" only. For Ryzen
users, set to this and back to 'host-passthrough" failed. But this way
works for ThreadRipper users.

The performance are not really differents for me :
- Host-passthrough (Ryzen 1600) with 12 CPUs passed through : 1104
- Core2Duo with 12 CPUs passed through : 1066

But by curiosity, where can come from this issue ?
Vfio, Qemu or OVMF ?

Thanks,
Maxime
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