[Bug 199939] New: guest crashes indentify_cpu

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https://bugzilla.kernel.org/show_bug.cgi?id=199939

            Bug ID: 199939
           Summary: guest crashes indentify_cpu
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.16.2, 4.17
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx
          Reporter: bugzilla-ko20180606@xxxxxxxxxx
        Regression: No

Created attachment 276331
  --> https://bugzilla.kernel.org/attachment.cgi?id=276331&action=edit
image of the kernel crash error in guest

Just got new virtual hosts using the AMD EPYC 7281 processor and am having
issues with guests crashing on start-up as per the attached snapshot.

If I use 4.9.103 or the default Debian stretch kernel there is no crash and
guest boots normally.

If I use the 4.6 Debian kernel from stretch-backports, my own 4.16.2 or 4.17rc7
then the guest crashes as per the attached image.

QEMU version is 2.12.

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