[PATCH] powerpc/pseries: export LPAR security flavor in lparcfg

[Michael Ellerman]

Laurent Dufour <ldufour at linux.ibm.com> writes:
> This is helpful to read the security flavor from inside the LPAR.

We already have /sys/kernel/debug/powerpc/security_features.

Is that not sufficient?

> Export it like this in /proc/powerpc/lparcfg:
>
> $ grep security_flavor /proc/powerpc/lparcfg
> security_flavor=1
>
> Value means:
> 0 Speculative execution fully enabled
> 1 Speculative execution controls to mitigate user-to-kernel attacks
> 2 Speculative execution controls to mitigate user-to-kernel and
>   user-to-user side-channel attacks

Those strings come from the FSP help, but we have no guarantee it won't
mean something different in future.

cheers