Commit-ID: f9de314b340f4816671f037e79ed01f685ac9787 Gitweb: http://git.kernel.org/tip/f9de314b340f4816671f037e79ed01f685ac9787 Author: Fenghua Yu <fenghua...@intel.com> AuthorDate: Thu, 29 May 2014 11:12:37 -0700 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Thu, 29 May 2014 14:31:25 -0700
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...@intel.com> Link: http://lkml.kernel.org/r/1401387164-43416-10-git-send-email-fenghua...@intel.com Signed-off-by: H. Peter Anvin <h...@linux.intel.com> --- arch/x86/include/asm/xsave.h | 37 ++++++++++++------------------------- 1 file changed, 12 insertions(+), 25 deletions(-) diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h index f9177a2..8b75824 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/