1) Change the default CPUID bits from 6/2/3 to 6/6/1, this passes the Linux kernel check. But I am not sure if that would introduce regressions, since some OSes apply quirks if they detect certain models (like we had with the sysenter issue in the past) 2) Only change the CPUID bits to 6/6/1 if we use SMP. Still has the above drawback, but would be limited to SMP guests only. 3) Set kvm64/kvm32 as the default CPU model if KVM is enabled. This would limit the report and taint to TCG, where SMP is rarely used. Additionally less people (if any) use it for production systems. 4) Make the Linux' kernel quirk dependent on the missing hypervisor bit. I don't think this will be accepted easily upstream (and I don't want to support Ingo's recent ideas ;-), also this would not fix older kernels. I can easily provide patches for all solutions, but I'd like to get advice from people on which one to pursue.
Doing (3) seems the most sensible thing to do, and it does not prevent doing (1) later on for TCG only.
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