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

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217307

--- Comment #10 from Michał Zegan (webczat@outlook.com) ---
Okay, i have done more tests.
So generally host-passthrough does not work, broadwell-notsx-ibrs,
skylake-notsx-ibrs and also nehalem do not work, kvm64 doesn't work, qemu64
works.
However, qemu64, even when I enable vmx and disable svm, boots without hyperv.
Windows shows that second level adress translation  is disabled.

I tried to use libvirt's xml files and even qemu sources to see difference
between qemu64 and broadwell-notsx-ibrs features, then enabled them all, the
effect is exactly the same. I mean cpuid features.

For these tests, everything like devices, secureboot, tpm, hyperv
enlightenments, were enabled.

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