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x86, fpu: decouple non-lazy/eager fpu restore from xsave

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Decouple non-lazy/eager fpu restore policy from the existence of the xsave
feature. Introduce a synthetic CPUID flag to represent the eagerfpu
policy. "eagerfpu=on" boot paramter will enable the policy.

Requested-by: H. Peter Anvin <[email protected]>
Requested-by: Linus Torvalds <[email protected]>
Signed-off-by: Suresh Siddha <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>
This commit is contained in:
Suresh Siddha 2012-09-06 14:58:52 -07:00 • committed by H. Peter Anvin
commit 5d2bd7009f
8 changed files with 112 additions and 66 deletions
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4
Documentation/kernel-parameters.txt
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@ -1833,6 +1833,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
eagerfpu= [X86]
on enable eager fpu restore
off disable eager fpu restore
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.