[PATCH V3 2/2] powerpc: Update to new option-vector-5 format for CAS

[Paul Mackerras]

On Tue, Feb 28, 2017 at 05:03:48PM +1100, Suraj Jitindar Singh wrote:
> On POWER9 the ibm,client-architecture-support (CAS) negotiation process
> has been updated to change how the host to guest negotiation is done for
> the new hash/radix mmu as well as the nest mmu, process tables and guest
> translation shootdown (GTSE).
> 
> The host tells the guest which options it supports in
> ibm,arch-vec-5-platform-support. The guest then chooses a subset of these
> to request in the CAS call and these are agreed to in the
> ibm,architecture-vec-5 property of the chosen node.
> 
> Thus we read ibm,arch-vec-5-platform-support and make our selection before
> calling CAS. We then parse the ibm,architecture-vec-5 property of the
> chosen node to check whether we should run as hash or radix.
> 
> ibm,arch-vec-5-platform-support format:
> 
> index value pairs: <index, val> ... <index, val>
> 
> index: Option vector 5 byte number
> val:   Some representation of supported values
> 
> Signed-off-by: Suraj Jitindar Singh <sjitindarsingh at gmail.com>

It would be good if the description mentioned the PAPR architecture
change request "CAS option vector additions for P9".

Apart from that,

Acked-by: Paul Mackerras <paulus at ozlabs.org>