From a03c376ebaf38394a63a75292329f38a47520c2c Mon Sep 17 00:00:00 2001 From: "Chang S. Bae" Date: Fri, 20 Jan 2023 16:18:58 -0800 Subject: [PATCH] x86/arch_prctl: Add AMX feature numbers as ABI constants Each distinct XSAVE feature has a number assigned to it. Among other things, the number determines the ordering of features in the XSAVE buffer and is also used to generate XSAVE bitmasks like the value for XCR0. AMX state is dynamically enabled by the architecture-specific prctl(). This prctl() takes one XSAVE feature number as an argument. However, the feature numbers are not defined in any readily available userspace headers. The means that each userspace app trying to use dynamic feature prctl()s will likely end up defining their own constants for each feature. Since these feature numbers are a part of the uabi, expose them in the prctl() uabi header. Save everyone the trouble of looking them up and defining their own. [ dhansen: expand changelog a bit ] Signed-off-by: Chang S. Bae Signed-off-by: Dave Hansen Reviewed-by: Tony Luck Link: https://lore.kernel.org/all/20230121001900.14900-3-chang.seok.bae%40intel.com --- arch/x86/include/uapi/asm/prctl.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h index 500b96e71f1868..f298c778f856e9 100644 --- a/arch/x86/include/uapi/asm/prctl.h +++ b/arch/x86/include/uapi/asm/prctl.h @@ -16,6 +16,9 @@ #define ARCH_GET_XCOMP_GUEST_PERM 0x1024 #define ARCH_REQ_XCOMP_GUEST_PERM 0x1025 +#define ARCH_XCOMP_TILECFG 17 +#define ARCH_XCOMP_TILEDATA 18 + #define ARCH_MAP_VDSO_X32 0x2001 #define ARCH_MAP_VDSO_32 0x2002 #define ARCH_MAP_VDSO_64 0x2003