Messages in this thread | | | Subject | Re: [PATCH] powerpc/pseries: export LPAR security flavor in lparcfg | From | Laurent Dufour <> | Date | Fri, 5 Mar 2021 09:04:20 +0100 |
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Le 05/03/2021 à 07:23, Michael Ellerman a écrit : > 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?
Not really, it only reports that security mitigation are on or off but not the level set through the ASMI menu. Furthermore, reporting it through /proc/powerpc/lparcfg allows an easy processing by the lparstat command (see below).
> >> 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.
I think this is nailed down, those strings came from: https://www.ibm.com/support/pages/node/715841
Where it is written (regarding AIX):
On an LPAR, one can use lparstat -x to display the current mitigation mode: 0 = Speculative execution fully enabled 1 = Speculative execution controls to mitigate user-to-kernel side-channel attacks 2 = Speculative execution controls to mitigate user-to-kernel and user-to-user side-channel attacks
We have been requested to provide almost the same, which I proposed in powerpc-utils: https://groups.google.com/g/powerpc-utils-devel/c/NaKXvdyl_UI/m/wa2stpIDAQAJ
Thanks, Laurent.
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