Thomas Gleixner 08ded2cd18 x86/fpu: Get rid of the FNSAVE optimization ... The FNSAVE support requires conditionals in quite some call paths because FNSAVE reinitializes the FPU hardware. If the save has to preserve the FPU register state then the caller has to conditionally restore it from memory when FNSAVE is in use. This also requires a conditional in context switch because the restore avoidance optimization cannot work with FNSAVE. As this only affects 20+ years old CPUs there is really no reason to keep this optimization effective for FNSAVE. It's about time to not optimize for antiques anymore. Just unconditionally FRSTOR the save content to the registers and clean up the conditionals all over the place. Suggested-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121454.617369268@linutronix.de		2021-06-23 18:29:41 +02:00
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api.h	x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update_pasid()	2021-06-03 16:33:09 +02:00
internal.h	x86/fpu: Get rid of the FNSAVE optimization	2021-06-23 18:29:41 +02:00
regset.h	x86: switch to ->regset_get()	2020-07-27 14:31:07 -04:00
signal.h	x86/signal: Introduce helpers to get the maximum signal frame size	2021-05-19 11:46:27 +02:00
types.h	x86/fpu/xstate: Add supervisor PASID state for ENQCMD	2020-09-17 20:22:10 +02:00
xcr.h	x86/fpu: Move xgetbv()/xsetbv() into a separate header	2020-09-07 19:54:20 +02:00
xstate.h	x86/fpu: Rename xstate copy functions which are related to UABI	2021-06-23 18:23:14 +02:00