[Bug 53641] New: nVMX: Windows as L2 guest doesn't work

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https://bugzilla.kernel.org/show_bug.cgi?id=53641

           Summary: nVMX: Windows as L2 guest doesn't work
           Product: Virtualization
           Version: unspecified
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx
        ReportedBy: nyh@xxxxxxxxxxxxxxxxxxx
        Regression: No


While Linux works fine as nested guests (L2), Windows of various versions do
not - which is of course a serious downside of KVM's nested VMX.

I verified this myself - seeing Windows 2000 hang on boot. It was also reported
by others and is not specific to Windows 2000, e.g. the following reports by
Gianluca Cecchi:

http://lists.fedoraproject.org/pipermail/virt/2011-June/002702.html
http://lists.fedoraproject.org/pipermail/virt/2011-November/002959.html
http://comments.gmane.org/gmane.comp.emulators.kvm.devel/82131

At some point during our research prototype, Windows L2 guests *did* work
(including Windows 2000), so it's probably not a big problem, but rather some
sneaky bug.

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