[Bug 203837] New: Booting kernel under KVM immediately freezes host

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203837

            Bug ID: 203837
           Summary: Booting kernel under KVM immediately freezes host
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: v5.2-rc2
          Hardware: PPC-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: PPC-64
          Assignee: platform_ppc-64@kernel-bugs.osdl.org
          Reporter: shawn@anastas.io
        Regression: No

Created attachment 283133
  --> https://bugzilla.kernel.org/attachment.cgi?id=283133&action=edit
Guest kernel config

When booting kernel v5.2-rc2 (and confirmed up to 156c05917) in a VM on a
POWER9 host running kernel 5.1.7, the host immediately locks up and
becomes unresponsive to the point of requiring a hard reset.

The last guest kernel message printed to the screen before the
host locks up is:

[    0.013940] smp: Bringing up secondary CPUs ...

Due to the nature of the bug, it is very difficult to bisect, since a manual
host reset is required each time the bug is encountered. Also, my only
POWER machine is my primary workstation.

The bug has also been confirmed on other host kernel versions (down to 5.0.x).
When downgrading the guest kernel to 5.1.0, the issue is not present.

The guest kernel .config is attached.

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