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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-29 10:29:20 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-30 19:49:24 +0200
commitb359e8a434cc3d09847010fc4aeccf48d69740e4 (patch)
tree8911c299dc1768c78d5452a1e7e0efd2fc8d5abb /arch/x86
parentdc1e35c6e95e8923cf1d3510438b63c600fee1e2 (diff)
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 'arch/x86')
-rw-r--r--arch/x86/kernel/cpu/common.c5
-rw-r--r--arch/x86/kernel/i387.c5
-rw-r--r--arch/x86/kernel/traps_64.c2
3 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index fabbcb7020f..6c2b9e756db 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -709,7 +709,10 @@ void __cpuinit cpu_init(void)
/*
* Force FPU initialization:
*/
- current_thread_info()->status = 0;
+ if (cpu_has_xsave)
+ current_thread_info()->status = TS_XSAVE;
+ else
+ current_thread_info()->status = 0;
clear_used_math();
mxcsr_feature_mask_init();
diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index e22a9a9dce8..b778e17e4b0 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -97,7 +97,10 @@ void __cpuinit fpu_init(void)
mxcsr_feature_mask_init();
/* clean state in init */
- current_thread_info()->status = 0;
+ if (cpu_has_xsave)
+ current_thread_info()->status = TS_XSAVE;
+ else
+ current_thread_info()->status = 0;
clear_used_math();
}
#endif /* CONFIG_X86_64 */
diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
index 3580a7938a2..38eb76156a4 100644
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -1134,7 +1134,7 @@ asmlinkage void math_state_restore(void)
/*
* Paranoid restore. send a SIGSEGV if we fail to restore the state.
*/
- if (unlikely(restore_fpu_checking(&me->thread.xstate->fxsave))) {
+ if (unlikely(restore_fpu_checking(me))) {
stts();
force_sig(SIGSEGV, me);
return;