linux-kernel - [PATCH v11 22/29] x86/fpu/amx: Enable the AMX feature in 64-bit mode

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Date:   Fri,  1 Oct 2021 15:37:21 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     bp@...e.de, luto@...nel.org, tglx@...utronix.de, mingo@...nel.org,
        x86@...nel.org
Cc:     len.brown@...el.com, lenb@...nel.org, dave.hansen@...el.com,
        thiago.macieira@...el.com, jing2.liu@...el.com,
        ravi.v.shankar@...el.com, linux-kernel@...r.kernel.org,
        chang.seok.bae@...el.com
Subject: [PATCH v11 22/29] x86/fpu/amx: Enable the AMX feature in 64-bit mode

In 64-bit mode, include the AMX state components in
XFEATURE_MASK_USER_SUPPORTED.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Reviewed-by: Len Brown <len.brown@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.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 0e355dfe711b..0b337e913423 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -37,7 +37,8 @@
 				      XFEATURE_MASK_Hi16_ZMM	 | \
 				      XFEATURE_MASK_PKRU | \
 				      XFEATURE_MASK_BNDREGS | \
-				      XFEATURE_MASK_BNDCSR)
+				      XFEATURE_MASK_BNDCSR | \
+				      XFEATURE_MASK_XTILE)
 
 /* Require ARCH_SET_STATE_ENABLE from XTILE_CFG and later states */
 #define XFEATURE_MASK_PERMISSION_REQUIRED GENMASK_ULL(63, XFEATURE_XTILE_CFG)
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 2ebc98c4b496..43539893dd82 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -492,7 +492,8 @@ 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
@@ -1008,6 +1009,9 @@ 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;
 
-- 
2.17.1