x86/fpu: Move xstate size to fpu_*_cfg
Use the new kernel and user space config storage to store and retrieve the XSTATE buffer sizes. The default and the maximum size are the same for now, but will change when support for dynamically enabled features is added. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20211014230739.296830097@linutronix.de
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