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| author | Anton Blanchard <anton@samba.org> | 2015-10-29 11:44:06 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-01 13:52:26 +1100 |
| commit | 3eb5d5888dc68c9b187998ca4249b8b9fa481eeb (patch) | |
| tree | 16c17e1867d56207321c404f361c1115aac6320e /Documentation/kernel-parameters.txt | |
| parent | dc4fbba11e4661a6a77a1f89ba32f9082e6395ff (diff) | |
| download | lwn-3eb5d5888dc68c9b187998ca4249b8b9fa481eeb.tar.gz lwn-3eb5d5888dc68c9b187998ca4249b8b9fa481eeb.zip | |
powerpc: Add ppc_strict_facility_enable boot option
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 <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 742f69d18fc8..8978c26cacdd 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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 |