x86/fpu/amx: Enable the AMX feature in 64-bit mode

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Add the AMX state components in XFEATURE_MASK_USER_SUPPORTED and the
TILE_DATA component to the dynamic states and update the permission check
table accordingly.

This is only effective on 64 bit kernels as for 32bit kernels
XFEATURE_MASK_TILE is defined as 0.

TILE_DATA is caller-saved state and the only dynamic state. Add build time
sanity check to ensure the assumption that every dynamic feature is caller-
saved.

Make AMX state depend on XFD as it is dynamic feature.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211021225527.10184-24-chang.seok.bae@intel.com

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Chang S. Bae 2021-10-21 15:55:27 -07:00 • committed by Borislav Petkov

parent db3e7321b4

commit 2308ee57d9

4 changed files with 13 additions and 4 deletions

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5

arch/x86/include/asm/fpu/xstate.h

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arch/x86/kernel/cpu/cpuid-deps.c

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arch/x86/kernel/fpu/core.c

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arch/x86/kernel/fpu/xstate.c

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