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x86: introduce noxsave boot parameter

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Introduce "noxsave" boot parameter which will disable the cpu's xsave/xrstor
capabilities. Useful for debugging and working around xsave related issues.

[ Impact: make it possible to debug problems in the field ]

Signed-off-by: Suresh Siddha <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Suresh Siddha 2009-05-22 12:17:45 -07:00 • committed by H. Peter Anvin
commit 0c752a9335
2 changed files with 11 additions and 0 deletions
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4
Documentation/kernel-parameters.txt
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@ -1535,6 +1535,10 @@ and is between 256 and 4096 characters. It is defined in the file
register save and restore. The kernel will only save
legacy floating-point registers on task switch.
noxsave [BUGS=X86] Disables x86 extended register state save
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
wfi(ARM) instruction doesn't work correctly and not to
use it. This is also useful when using JTAG debugger.