[PATCH] powerpc/64s: handle ISA v3.1 local copy-paste context switches

[Paul Mackerras]

On Tue, Aug 25, 2020 at 05:55:35PM +1000, Nicholas Piggin wrote:
> The ISA v3.1 the copy-paste facility has a new memory move functionality
> which allows the copy buffer to be pasted to domestic memory (RAM) as
> opposed to foreign memory (accelerator).
> 
> This means the POWER9 trick of avoiding the cp_abort on context switch if
> the process had not mapped foreign memory does not work on POWER10. Do the
> cp_abort unconditionally there.
> 
> KVM must also cp_abort on guest exit to prevent copy buffer state leaking
> between contexts.
> 
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

For the KVM part:

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