[PATCH] [Zesty] UBUNTU: SAUCE: powerpc/powernv: Tell OPAL about our MMU mode on POWER9

[Michael Ellerman]

Breno Leitao <leitao at debian.org> writes:

> diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
> index e0f856bfbfe8..a3b6de84f49c 100644
> --- a/arch/powerpc/platforms/powernv/opal.c
> +++ b/arch/powerpc/platforms/powernv/opal.c
> @@ -66,11 +68,24 @@ void opal_configure_cores(void)
>  	 * but it might clobber a bunch.
>  	 */
>  #ifdef __BIG_ENDIAN__
> -	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
> +	reinit_flags |= OPAL_REINIT_CPUS_HILE_BE;
>  #else
> -	opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
> +	reinit_flags |= OPAL_REINIT_CPUS_HILE_LE;
>  #endif
>  
> +	/*
> +	 * POWER9 always support running hash:
> +	 *  ie. Host hash  supports  hash guests
> +	 *      Host radix supports  hash/radix guests
> +	 */
> +	if (cpu_has_feature(CPU_FTR_ARCH_300)) {

This is wrong. It can break booting on bare-metal Power8 machines with
some versions of firmware.

Fix here:

https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=fixes&id=a70b487b07cf4201bc6702e7f646fa593b23009f

http://patchwork.ozlabs.org/patch/789381/


cheers