@Christian,
Yes. This following patch fixes the problem
 https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg01020.html
 
I saw your ping on the patch. I am not sure why it is not picked up. I am going 
ping them today.

>If I might ask - how does the kernel fix you referenced interact with this 
>proposed qemu change?
>Assumptions (please correct me):
Problem seem to happen when guest tries to access the SPEC_CTRL register to 
with the wrong settings. The kernel fix avoids writing those values and avoids 
#GP fault.
  
>1. with the qemu change and using that Rome-v2 it would ask to expose both 
>features and no more crash (even >on unfixed kernels)
Yes. With Qemu patch EPYC-Rome v2 this issue will be fixed.

>2. with the kernel fix it will no more crash, even with an unfixed qemu?
Yes, That is correct. We need at lease one of these patches to fix this problem.

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https://bugs.launchpad.net/bugs/1915063

Title:
  Windows 10 wil not install using qemu-system-x86_64

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