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From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, tglx@linutronix.de, dave.hansen@linux.intel.com,
	arjan@linux.intel.com, ravi.v.shankar@intel.com,
	chang.seok.bae@intel.com
Subject: [PATCH 07/23] x86/fpu: Add basic helpers for dynamically enabled features
Date: Thu, 21 Oct 2021 15:55:11 -0700	[thread overview]
Message-ID: <20211021225527.10184-8-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20211021225527.10184-1-chang.seok.bae@intel.com>

From: Thomas Gleixner <tglx@linutronix.de>

To allow building up the infrastructure required to support dynamically
enabled FPU features add:

 - XFEATURES_MASK_DYNAMIC

   This constant will hold xfeatures which can be dynamically enabled.

 - fpu_state_size_dynamic()

   A static branch for 64-bit and a simple 'return false' for 32-bit.

   This helper allows to add dynamic feature specific changes to common
   code which is shared between 32-bit and 64-bit without #ifdeffery.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
---
Changes from the tglx tree:
* Add the missing #ifdeffery. (Dave Hansen)
---
 arch/x86/include/asm/fpu/xstate.h | 14 ++++++++++++++
 arch/x86/kernel/fpu/core.c        |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 43ae89d4bcd2..023000e79348 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -43,6 +43,9 @@
 #define XFEATURE_MASK_USER_RESTORE	\
 	(XFEATURE_MASK_USER_SUPPORTED & ~XFEATURE_MASK_PKRU)
 
+/* Features which are dynamically enabled for a process on request */
+#define XFEATURE_MASK_USER_DYNAMIC	0ULL
+
 /* All currently supported supervisor features */
 #define XFEATURE_MASK_SUPERVISOR_SUPPORTED (XFEATURE_MASK_PASID)
 
@@ -96,4 +99,15 @@ int xfeature_size(int xfeature_nr);
 void xsaves(struct xregs_state *xsave, u64 mask);
 void xrstors(struct xregs_state *xsave, u64 mask);
 
+#ifdef CONFIG_X86_64
+DECLARE_STATIC_KEY_FALSE(__fpu_state_size_dynamic);
+#endif
+
+static __always_inline __pure bool fpu_state_size_dynamic(void)
+{
+	if (IS_ENABLED(CONFIG_X86_64))
+		return static_branch_unlikely(&__fpu_state_size_dynamic);
+	return false;
+}
+
 #endif
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index eb911c843386..ff7d239fe961 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -25,6 +25,10 @@
 #define CREATE_TRACE_POINTS
 #include <asm/trace/fpu.h>
 
+#ifdef CONFIG_X86_64
+DEFINE_STATIC_KEY_FALSE(__fpu_state_size_dynamic);
+#endif
+
 /* The FPU state configuration data for kernel and user space */
 struct fpu_state_config	fpu_kernel_cfg __ro_after_init;
 struct fpu_state_config fpu_user_cfg __ro_after_init;
-- 
2.17.1


  parent reply	other threads:[~2021-10-21 23:05 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-21 22:55 [PATCH 00/23] x86: Support Intel Advanced Matrix Extensions (part 4) Chang S. Bae
2021-10-21 22:55 ` [PATCH 01/23] signal: Add an optional check for altstack size Chang S. Bae
2021-10-22  0:06   ` Bae, Chang Seok
2021-10-22 15:20   ` Eric W. Biederman
2021-10-22 20:58     ` Bae, Chang Seok
2021-10-22 22:51     ` Dave Hansen
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 02/23] x86/signal: Implement sigaltstack size validation Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 03/23] x86/fpu/xstate: Provide xstate_calculate_size() Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 04/23] x86/fpu: Add members to struct fpu to cache permission information Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 05/23] x86/fpu: Add fpu_state_config::legacy_features Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 06/23] x86/arch_prctl: Add controls for dynamic XSTATE components Chang S. Bae
2021-10-24 21:17   ` Borislav Petkov
2021-10-26  9:11     ` [PATCH] Documentation/x86: Add documentation for using dynamic XSTATE features Chang S. Bae
2021-10-26 16:16       ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-28 13:10       ` tip-bot2 for Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] x86/arch_prctl: Add controls for dynamic XSTATE components tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` Chang S. Bae [this message]
2021-10-26 16:16   ` [tip: x86/fpu] x86/fpu: Add basic helpers for dynamically enabled features tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 08/23] x86/signal: Use fpu::__state_user_size for sigalt stack validation Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 09/23] x86/fpu/signal: Prepare for variable sigframe length Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 10/23] x86/fpu: Prepare fpu_clone() for dynamically enabled features Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 11/23] x86/fpu: Reset permission and fpstate on exec() Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 12/23] x86/cpufeatures: Add eXtended Feature Disabling (XFD) feature bit Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 13/23] x86/msr-index: Add MSRs for XFD Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 14/23] x86/fpu: Add XFD state to fpstate Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 15/23] x86/fpu: Add sanity checks for XFD Chang S. Bae
2021-10-25  8:11   ` Borislav Petkov
2021-10-25 20:15     ` Thomas Gleixner
2021-10-25  8:33   ` Mika Penttilä
2021-10-25 18:13     ` Thomas Gleixner
2021-10-25 19:57       ` Dave Hansen
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Thomas Gleixner
2021-10-21 22:55 ` [PATCH 16/23] x86/fpu: Update XFD state where required Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 17/23] x86/fpu/xstate: Add XFD #NM handler Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 18/23] x86/fpu/xstate: Add fpstate_realloc()/free() Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 19/23] x86/fpu/xstate: Prepare XSAVE feature table for gaps in state component numbers Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 20/23] x86/fpu/amx: Define AMX state components and have it used for boot-time checks Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 21/23] x86/fpu: Calculate the default sizes independently Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 22/23] x86/fpu: Add XFD handling for dynamic states Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae
2021-10-21 22:55 ` [PATCH 23/23] x86/fpu/amx: Enable the AMX feature in 64-bit mode Chang S. Bae
2021-10-26 16:16   ` [tip: x86/fpu] " tip-bot2 for Chang S. Bae

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