You see in the referred upstream commits, this is how it landed

And keeping the patches close to as it is upstream helps

Otherwise one wonders why it is different than in the original commit

simplified explanation of the timeline
1. orginal code always exposed the capability
2. new code does mpt exposed it on AMD depending on 
CPUID_7_0_EDX_ARCH_CAPABILITIES
3. Even newer code made this controllable via a flag that is controlled by the 
machine type - so it can behave old or new way.
=> That code that was added and then removed actually only got moved to another 
place where it can be behind this controllable compat flag.

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https://bugs.launchpad.net/bugs/2131822

Title:
  Known Windows 11 KVM Issue AMD KMODE Exception

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