[PATCH v3 4/9] KVM: PPC: Ultravisor: Add generic ultravisor call handler

[Paul Mackerras]

On Thu, Jun 06, 2019 at 02:36:09PM -0300, Claudio Carvalho wrote:
> From: Ram Pai <linuxram at us.ibm.com>
> 
> Add the ucall() function, which can be used to make ultravisor calls
> with varied number of in and out arguments. Ultravisor calls can be made
> from the host or guests.
> 
> This copies the implementation of plpar_hcall().

Again, we will want all of this on every powernv-capable kernel, since
they will all need to do UV_WRITE_PATE, even if they have no other
support for the ultravisor.

Paul.