[Bug 217307] windows guest entering boot loop when nested virtualization enabled and hyperv installed

bugzilla-daemon
2023-07-10T19:47:09Z

--- Comment #18 from Sean Christopherson (seanjc@google.com) ---
> it seems that my problem is something that exclusively affects 12th gen and
> above

Can you try running a single vCPU VM, and pin that vCPU to a pCPU on a P-Core?
If this is indeed specific to 12th gen CPUs, then my guess is that hybrid CPUs
are to blame. E.g. KVM already disables vPMU (commit 4d7404e5ee00 "KVM:
x86/pmu: Disable vPMU support on hybrid CPUs (host PMUs)"), I wouldn't be at
all surprised if there are more problems lurking.