Chang S. Bae c351101678 x86/cpufeatures: Add eXtended Feature Disabling (XFD) feature bit ... Intel's eXtended Feature Disable (XFD) feature is an extension of the XSAVE architecture. XFD allows the kernel to enable a feature state in XCR0 and to receive a #NM trap when a task uses instructions accessing that state. This is going to be used to postpone the allocation of a larger XSTATE buffer for a task to the point where it is actually using a related instruction after the permission to use that facility has been granted. XFD is not used by the kernel, but only applied to userspace. This is a matter of policy as the kernel knows how a fpstate is reallocated and the XFD state. The compacted XSAVE format is adjustable for dynamic features. Make XFD depend on XSAVES. Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20211021225527.10184-13-chang.seok.bae@intel.com		2021-10-26 10:18:09 +02:00
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asm	x86/cpufeatures: Add eXtended Feature Disabling (XFD) feature bit	2021-10-26 10:18:09 +02:00
uapi/asm	x86/arch_prctl: Add controls for dynamic XSTATE components	2021-10-26 10:18:09 +02:00