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

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