Interesting, thanks Leonardo!
Tested on Bionic (4.15) and Disco (4.18).
Default:
sudo modprobe kvm_pr
modprobe: ERROR: could not insert 'kvm_pr': Input/output error
Added "disable_radix" to the guest kernel commandline and retried loading the
module again.
Bionic: Malformed early option 'disable_radix'
Disco: accepts the option
With that option set kvm_pr can be loaded.
Thanks now all fits together, and that is "enough" for me.
If there are kernel fixes that you'd want in Bionic to get disable_radix
to work we can add a kernel task (I don't need it).
TL;DR: for Disco forward I should be able to enable P9 based nested
tests with that tweak in place.
** Also affects: qemu (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Wishlist
** Changed in: qemu (Ubuntu)
Status: New => Invalid
** Changed in: qemu (Ubuntu Bionic)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1778854
Title:
kvm_pr on power9 not loadable
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