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powerpc: Add ppc_strict_facility_enable boot option

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Add a boot option that strictly manages the MSR unavailable bits.
This catches kernel uses of FP/Altivec/SPE that would otherwise
corrupt user state.

Signed-off-by: Anton Blanchard <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Anton Blanchard 2015-10-29 11:44:06 +11:00 • committed by Michael Ellerman
commit 3eb5d5888d
4 changed files with 49 additions and 7 deletions
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6
Documentation/kernel-parameters.txt
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@ -2978,6 +2978,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
may be specified.
Format: <port>,<port>....
ppc_strict_facility_enable
[PPC] This option catches any kernel floating point,
Altivec, VSX and SPE outside of regions specifically
allowed (eg kernel_enable_fpu()/kernel_disable_fpu()).
There is some performance impact when enabling this.
print-fatal-signals=
[KNL] debug: print fatal signals