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authorAnton Blanchard <anton@samba.org>2015-10-29 01:44:06 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2015-12-01 03:52:26 +0100
commit3eb5d5888dc68c9b187998ca4249b8b9fa481eeb (patch)
tree16c17e1867d56207321c404f361c1115aac6320e /Documentation
parentpowerpc: Create disable_kernel_{fp,altivec,vsx,spe}() (diff)
downloadlinux-3eb5d5888dc68c9b187998ca4249b8b9fa481eeb.tar.xz
linux-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')
-rw-r--r--Documentation/kernel-parameters.txt6
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