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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-13 18:20:04 -0600 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-13 18:20:04 -0600 |
| commit | 7453f33b2e07fc2835e24cda0893de83c78d8d76 (patch) | |
| tree | 02d82193515fcc94cf39e284fd325c4491913331 /Documentation | |
| parent | fd1cf90580289f83f9c972bb367a74d846d281c4 (diff) | |
| parent | d0f2dd186133a0241a2ccefb188a0e49e8187859 (diff) | |
Merge branch 'x86-xsave-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/xsave changes from Peter Anvin:
"This is a patchset to support the XSAVES instruction required to
support context switch of supervisor-only features in upcoming
silicon.
This patchset missed the 3.16 merge window, which is why it is based
on 3.15-rc7"
* 'x86-xsave-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, xsave: Add forgotten inline annotation
x86/xsaves: Clean up code in xstate offsets computation in xsave area
x86/xsave: Make it clear that the XSAVE macros use (%edi)/(%rdi)
Define kernel API to get address of each state in xsave area
x86/xsaves: Enable xsaves/xrstors
x86/xsaves: Call booting time xsaves and xrstors in setup_init_fpu_buf
x86/xsaves: Save xstate to task's xsave area in __save_fpu during booting time
x86/xsaves: Add xsaves and xrstors support for booting time
x86/xsaves: Clear reserved bits in xsave header
x86/xsaves: Use xsave/xrstor for saving and restoring user space context
x86/xsaves: Use xsaves/xrstors for context switch
x86/xsaves: Use xsaves/xrstors to save and restore xsave area
x86/xsaves: Define a macro for handling xsave/xrstor instruction fault
x86/xsaves: Define macros for xsave instructions
x86/xsaves: Change compacted format xsave area header
x86/alternative: Add alternative_input_2 to support alternative with two features and input
x86/xsaves: Add a kernel parameter noxsaves to disable xsaves/xrstors
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a8eb6afce6a4..5ae8608ca9f5 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2200,6 +2200,21 @@ 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. + noxsaveopt [X86] Disables xsaveopt used in saving x86 extended + register states. The kernel will fall back to use + xsave to save the states. By using this parameter, + performance of saving the states is degraded because + xsave doesn't support modified optimization while + xsaveopt supports it on xsaveopt enabled systems. + + noxsaves [X86] Disables xsaves and xrstors used in saving and + restoring x86 extended register state in compacted + form of xsave area. The kernel will fall back to use + xsaveopt and xrstor to save and restore the states + in standard form of xsave area. By using this + parameter, xsave area per process might occupy more + memory on xsaves enabled systems. + eagerfpu= [X86] on enable eager fpu restore off disable eager fpu restore |