diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2014-05-29 20:12:37 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-05-29 23:31:25 +0200 |
| commit | f9de314b340f4816671f037e79ed01f685ac9787 (patch) | |
| tree | 13df1f8ba497a3bef4b272c529c942dfb593aa54 /arch/x86 | |
| parent | x86/xsaves: Use xsaves/xrstors to save and restore xsave area (diff) | |
| download | linux-f9de314b340f4816671f037e79ed01f685ac9787.tar.xz linux-f9de314b340f4816671f037e79ed01f685ac9787.zip | |
x86/xsaves: Use xsaves/xrstors for context switch
If xsaves is eanbled, use xsaves/xrstors for context switch to support
compacted format xsave area to occupy less memory and modified optimization
to improve saving performance.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-10-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/xsave.h | 37 |
1 files changed, 12 insertions, 25 deletions
diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h index f9177a2a97e9..8b75824e41dd 100644 --- a/arch/x86/include/asm/xsave.h +++ b/arch/x86/include/asm/xsave.h @@ -129,22 +129,20 @@ static inline int xrstor_state(struct xsave_struct *fx, u64 mask) return err; } -static inline int fpu_xrstor_checking(struct xsave_struct *fx) +/* + * Save xstate context for old process during context switch. + */ +static inline void fpu_xsave(struct fpu *fpu) { - int err; - - asm volatile("1: .byte " REX_PREFIX "0x0f,0xae,0x2f\n\t" - "2:\n" - ".section .fixup,\"ax\"\n" - "3: movl $-1,%[err]\n" - " jmp 2b\n" - ".previous\n" - _ASM_EXTABLE(1b, 3b) - : [err] "=r" (err) - : "D" (fx), "m" (*fx), "a" (-1), "d" (-1), "0" (0) - : "memory"); + xsave_state(&fpu->state->xsave, -1); +} - return err; +/* + * Restore xstate context for new process during context switch. + */ +static inline int fpu_xrstor_checking(struct xsave_struct *fx) +{ + return xrstor_state(fx, -1); } static inline int xsave_user(struct xsave_struct __user *buf) @@ -194,15 +192,4 @@ static inline int xrestore_user(struct xsave_struct __user *buf, u64 mask) return err; } -static inline void fpu_xsave(struct fpu *fpu) -{ - /* This, however, we can work around by forcing the compiler to select - an addressing mode that doesn't require extended registers. */ - alternative_input( - ".byte " REX_PREFIX "0x0f,0xae,0x27", - ".byte " REX_PREFIX "0x0f,0xae,0x37", - X86_FEATURE_XSAVEOPT, - [fx] "D" (&fpu->state->xsave), "a" (-1), "d" (-1) : - "memory"); -} #endif |