On Wed, 23 Jun 2021 23:05:14 +1000, Michael Ellerman wrote:

Commit a21d1becaa3f ("powerpc: Reintroduce is_kvm_guest() as a fast-path
check") added is_kvm_guest() and changed kvm_para_available() to use it.

is_kvm_guest() checks a static key, kvm_guest, and that static key is
set in check_kvm_guest().

The problem is check_kvm_guest() is only called on pseries, and even
then only in some configurations. That means is_kvm_guest() always
returns false on all non-pseries and some pseries depending on
configuration. That's a bug.

[...]

Applied to powerpc/next.

[1/1] powerpc: Fix is_kvm_guest() / kvm_para_available()
      https://git.kernel.org/powerpc/c/95839225639ba7c3d8d7231b542728dcf222bf2d

cheers