From: Michael Ellerman <mpe@ellerman.id.au>
To: Laurent Dufour <ldufour@linux.ibm.com>,
benh@kernel.crashing.org, paulus@samba.org,
linuxppc-dev@lists.ozlabs.org
Cc: nathanl@linux.ibm.com, cheloha@linux.ibm.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/pseries: export LPAR security flavor in lparcfg
Date: Fri, 05 Mar 2021 17:23:21 +1100 [thread overview]
Message-ID: <871rcuruee.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <20210304114240.54112-1-ldufour@linux.ibm.com>
Laurent Dufour <ldufour@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
next prev parent reply other threads:[~2021-03-05 6:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 11:42 Laurent Dufour
2021-03-05 6:23 ` Michael Ellerman [this message]
2021-03-05 8:04 ` Laurent Dufour
2021-03-05 11:43 ` Michael Ellerman
2021-03-05 11:45 ` Laurent Dufour
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