Kirill A. Shutemov 2f8794bd08 x86/mm: Provide arch_prctl() interface for LAM ... Add a few of arch_prctl() handles: - ARCH_ENABLE_TAGGED_ADDR enabled LAM. The argument is required number of tag bits. It is rounded up to the nearest LAM mode that can provide it. For now only LAM_U57 is supported, with 6 tag bits. - ARCH_GET_UNTAG_MASK returns untag mask. It can indicates where tag bits located in the address. - ARCH_GET_MAX_TAG_BITS returns the maximum tag bits user can request. Zero if LAM is not supported. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Alexander Potapenko <glider@google.com> Link: https://lore.kernel.org/all/20230312112612.31869-9-kirill.shutemov%40linux.intel.com		2023-03-16 13:08:39 -07:00
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asm	x86/mm: Provide arch_prctl() interface for LAM	2023-03-16 13:08:39 -07:00
uapi/asm	x86/mm: Provide arch_prctl() interface for LAM	2023-03-16 13:08:39 -07:00