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From: Xin Li <xin3.li@intel.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org,
	brgerst@gmail.com, chang.seok.bae@intel.com
Subject: [PATCH v4 4/5] x86/gsseg: move load_gs_index() to its own new header file
Date: Wed, 19 Oct 2022 02:50:34 -0700	[thread overview]
Message-ID: <20221019095035.10823-5-xin3.li@intel.com> (raw)
In-Reply-To: <20221019095035.10823-1-xin3.li@intel.com>

From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

GS is a special segment on x86_64, move load_gs_index() to its own new
header file.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
---
 arch/x86/ia32/ia32_signal.c          |  1 +
 arch/x86/include/asm/gsseg.h         | 41 ++++++++++++++++++++++++++++
 arch/x86/include/asm/mmu_context.h   |  1 +
 arch/x86/include/asm/special_insns.h | 21 --------------
 arch/x86/kernel/paravirt.c           |  1 +
 arch/x86/kernel/tls.c                |  1 +
 6 files changed, 45 insertions(+), 21 deletions(-)
 create mode 100644 arch/x86/include/asm/gsseg.h

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index c9c3859322fa..14c739303099 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -34,6 +34,7 @@
 #include <asm/sigframe.h>
 #include <asm/sighandling.h>
 #include <asm/smap.h>
+#include <asm/gsseg.h>
 
 static inline void reload_segments(struct sigcontext_32 *sc)
 {
diff --git a/arch/x86/include/asm/gsseg.h b/arch/x86/include/asm/gsseg.h
new file mode 100644
index 000000000000..d15577c39e8d
--- /dev/null
+++ b/arch/x86/include/asm/gsseg.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_X86_GSSEG_H
+#define _ASM_X86_GSSEG_H
+
+#include <linux/types.h>
+
+#include <asm/asm.h>
+#include <asm/cpufeature.h>
+#include <asm/alternative.h>
+#include <asm/processor.h>
+#include <asm/nops.h>
+
+#ifdef CONFIG_X86_64
+
+extern asmlinkage void asm_load_gs_index(u16 selector);
+
+static inline void native_load_gs_index(unsigned int selector)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	asm_load_gs_index(selector);
+	local_irq_restore(flags);
+}
+
+#endif /* CONFIG_X86_64 */
+
+#ifndef CONFIG_PARAVIRT_XXL
+
+static inline void load_gs_index(unsigned int selector)
+{
+#ifdef CONFIG_X86_64
+	native_load_gs_index(selector);
+#else
+	loadsegment(gs, selector);
+#endif
+}
+
+#endif /* CONFIG_PARAVIRT_XXL */
+
+#endif /* _ASM_X86_GSSEG_H */
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index b8d40ddeab00..e01aa74a6de7 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -12,6 +12,7 @@
 #include <asm/tlbflush.h>
 #include <asm/paravirt.h>
 #include <asm/debugreg.h>
+#include <asm/gsseg.h>
 
 extern atomic64_t last_mm_ctx_id;
 
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index a71d0e8d4684..cfd9499b617c 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -120,17 +120,6 @@ static inline void native_wbinvd(void)
 	asm volatile("wbinvd": : :"memory");
 }
 
-extern asmlinkage void asm_load_gs_index(u16 selector);
-
-static inline void native_load_gs_index(unsigned int selector)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-	asm_load_gs_index(selector);
-	local_irq_restore(flags);
-}
-
 static inline unsigned long __read_cr4(void)
 {
 	return native_read_cr4();
@@ -184,16 +173,6 @@ static inline void wbinvd(void)
 	native_wbinvd();
 }
 
-
-static inline void load_gs_index(unsigned int selector)
-{
-#ifdef CONFIG_X86_64
-	native_load_gs_index(selector);
-#else
-	loadsegment(gs, selector);
-#endif
-}
-
 #endif /* CONFIG_PARAVIRT_XXL */
 
 static inline void clflush(volatile void *__p)
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 7ca2d46c08cc..00f6a92551d2 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -32,6 +32,7 @@
 #include <asm/special_insns.h>
 #include <asm/tlb.h>
 #include <asm/io_bitmap.h>
+#include <asm/gsseg.h>
 
 /*
  * nop stub, which must not clobber anything *including the stack* to
diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 3c883e064242..3ffbab0081f4 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -12,6 +12,7 @@
 #include <asm/ldt.h>
 #include <asm/processor.h>
 #include <asm/proto.h>
+#include <asm/gsseg.h>
 
 #include "tls.h"
 
-- 
2.34.1


  parent reply	other threads:[~2022-10-19 12:01 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-19  9:50 [PATCH v4 0/5] Enable LKGS instruction Xin Li
2022-10-19  9:50 ` [PATCH v4 1/5] x86/cpufeature: add the cpu feature bit for LKGS Xin Li
2022-10-19  9:50 ` [PATCH v4 2/5] x86/opcode: add the LKGS instruction to x86-opcode-map Xin Li
2022-10-19  9:50 ` [PATCH v4 3/5] x86/gsseg: make asm_load_gs_index() take an u16 Xin Li
2022-10-19  9:50 ` Xin Li [this message]
2022-10-19  9:50 ` [PATCH v4 5/5] x86/gsseg: use the LKGS instruction if available for load_gs_index() Xin Li
2022-10-19 12:16   ` Juergen Gross
2022-10-19 17:45     ` Li, Xin3
2022-10-19 18:01       ` H. Peter Anvin
2022-10-20  4:54         ` Juergen Gross
2022-10-20  6:05           ` Li, Xin3
2022-10-20  4:53       ` Juergen Gross
2022-10-20  5:58         ` Li, Xin3
2022-10-20  6:08           ` Juergen Gross
2022-10-20  6:24             ` Li, Xin3
2022-10-19 10:23 [PATCH v4 0/5] x86: Enable LKGS instruction Xin Li
2022-10-19 10:23 ` [PATCH v4 4/5] x86/gsseg: move load_gs_index() to its own new header file Xin Li

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