[PATCH 4.19] powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle

[Greg KH]

On Wed, Apr 15, 2020 at 10:40:05PM +1000, Andrew Donnellan wrote:
> From: Michael Ellerman <mpe at ellerman.id.au>
> 
> commit 53a712bae5dd919521a58d7bad773b949358add0 upstream.
> 
> In order to implement KUAP (Kernel Userspace Access Protection) on
> Power9 we will be using the AMR, and therefore indirectly the
> UAMOR/AMOR.
> 
> So save/restore these regs in the idle code.
> 
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> [ajd: Backport to 4.19 tree, CVE-2020-11669]
> Signed-off-by: Andrew Donnellan <ajd at linux.ibm.com>
> ---
>  arch/powerpc/kernel/idle_book3s.S | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)

This and the 4.14 patch now queued up, thanks.

greg k-h