Public bug reported:

Hi,
this might be the worst bug report ever, but there just isn't a lot more info 
available when the issue occurs.

I tried to set up 2nd level KVM on a P9 machine with kvm_pr but I run into 
(this is the series on commands I used on P8 btw):
  $ sudo modprobe kvm_pr
  modprobe: ERROR: could not insert 'kvm_pr': Input/output error

Unfortunately there is no dmesg message (not even with level set to
debug) or anything like it, so I'm stuck asking if P9 does not work with
kvm_pr at all or if there are other constraints one should know?

Note: while no more a problem for kvm_hv on P9 I disabled SMT but the
issue persists.

Modinfo LGTM and matches the kernel:
ubuntu@bionic-kvm:~$ modinfo kvm_pr
filename:       /lib/modules/4.15.0-23-generic/kernel/arch/powerpc/kvm/kvm-pr.ko
alias:          devname:kvm
alias:          char-major-10-232
license:        GPL
srcversion:     CE18B50FD03CB9D9C432700
depends:        kvm
intree:         Y
name:           kvm_pr
vermagic:       4.15.0-23-generic SMP mod_unload mprofile-kernel
signat:         PKCS#7
signer:         
sig_key:        
sig_hashalgo:   md4
ubuntu@bionic-kvm:~$ uname -a
Linux bionic-kvm 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 17:59:00 UTC 2018 
ppc64le ppc64le ppc64le GNU/Linux

It feels more that I'm missing something than a bug, but in that case I
have to ask what it is.

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1778854

Title:
  kvm_pr on power9 not loadable

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