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| author | Suresh Siddha | 2008-07-29 19:29:20 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2008-07-30 19:49:24 +0200 |
| commit | b359e8a434cc3d09847010fc4aeccf48d69740e4 (patch) | |
| tree | 8911c299dc1768c78d5452a1e7e0efd2fc8d5abb /include/asm-x86/processor.h | |
| parent | x86, xsave: enable xsave/xrstor on cpus with xsave support (diff) | |
| download | kernel-qcow2-linux-b359e8a434cc3d09847010fc4aeccf48d69740e4.tar.gz kernel-qcow2-linux-b359e8a434cc3d09847010fc4aeccf48d69740e4.tar.xz kernel-qcow2-linux-b359e8a434cc3d09847010fc4aeccf48d69740e4.zip | |
x86, xsave: context switch support using xsave/xrstor
Uses xsave/xrstor (instead of traditional fxsave/fxrstor) in context switch
when available.
Introduces TS_XSAVE flag, which determine the need to use xsave/xrstor
instructions during context switch instead of the legacy fxsave/fxrstor
instructions. Thread-synchronous status word is already in L1 cache during
this code patch and thus minimizes the performance penality compared to
(cpu_has_xsave) checks.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86/processor.h')
| -rw-r--r-- | include/asm-x86/processor.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h index d7c0221c0278..77b7af6b573b 100644 --- a/include/asm-x86/processor.h +++ b/include/asm-x86/processor.h @@ -362,6 +362,7 @@ union thread_xstate { struct i387_fsave_struct fsave; struct i387_fxsave_struct fxsave; struct i387_soft_struct soft; + struct xsave_struct xsave; }; #ifdef CONFIG_X86_64 |