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    Subject[PATCH v9 21/26] x86/fpu/amx: Enable the AMX feature in 64-bit mode
    Date
    In 64-bit mode, include the AMX state components in
    XFEATURE_MASK_USER_SUPPORTED.

    Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
    Reviewed-by: Len Brown <len.brown@intel.com>
    Cc: x86@kernel.org
    Cc: linux-kernel@vger.kernel.org
    ---
    Changes from v5:
    * Adjusted macro changes and moved the disabling code for non-64-bit mode
    for the new base changes.

    Changes from v4:
    * Removed the irrelevant line from the changelog. (Thomas Gleixner)
    ---
    arch/x86/include/asm/fpu/xstate.h | 3 ++-
    arch/x86/kernel/fpu/xstate.c | 6 +++++-
    2 files changed, 7 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
    index 912b420cb148..f934ce88c048 100644
    --- a/arch/x86/include/asm/fpu/xstate.h
    +++ b/arch/x86/include/asm/fpu/xstate.h
    @@ -35,7 +35,8 @@
    XFEATURE_MASK_Hi16_ZMM | \
    XFEATURE_MASK_PKRU | \
    XFEATURE_MASK_BNDREGS | \
    - XFEATURE_MASK_BNDCSR)
    + XFEATURE_MASK_BNDCSR | \
    + XFEATURE_MASK_XTILE)

    /*
    * Features which are restored when returning to user space.
    diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
    index dac01e4d7654..96056f49bcff 100644
    --- a/arch/x86/kernel/fpu/xstate.c
    +++ b/arch/x86/kernel/fpu/xstate.c
    @@ -538,7 +538,8 @@ static void __init print_xstate_offset_size(void)
    XFEATURE_MASK_PKRU | \
    XFEATURE_MASK_BNDREGS | \
    XFEATURE_MASK_BNDCSR | \
    - XFEATURE_MASK_PASID)
    + XFEATURE_MASK_PASID | \
    + XFEATURE_MASK_XTILE)

    /*
    * setup the xstate image representing the init state
    @@ -1054,6 +1055,9 @@ void __init fpu__init_system_xstate(void)
    xfeatures_mask_all &= XFEATURE_MASK_USER_SUPPORTED |
    XFEATURE_MASK_SUPERVISOR_SUPPORTED;

    + if (!IS_ENABLED(CONFIG_X86_64))
    + xfeatures_mask_all &= ~XFEATURE_MASK_XTILE;
    +
    /* Store it for paranoia check at the end */
    xfeatures = xfeatures_mask_all;
    /* Do not support the dynamically allocated buffer yet. */
    --
    2.17.1
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