linux-kernel - [PATCH bpf 1/3] x86/mm: Move is_vsyscall_vaddr() into mm

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Message-Id: <20240119073019.1528573-2-houtao@huaweicloud.com>
Date: Fri, 19 Jan 2024 15:30:17 +0800
From: Hou Tao <houtao@...weicloud.com>
To: x86@...nel.org,
	bpf@...r.kernel.org
Cc: Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H . Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org,
	xingwei lee <xrivendell7@...il.com>,
	Jann Horn <jannh@...gle.com>,
	houtao1@...wei.com
Subject: [PATCH bpf 1/3] x86/mm: Move is_vsyscall_vaddr() into mm_internal.h

From: Hou Tao <houtao1@...wei.com>

Moving is_vsyscall_vaddr() into mm_internal.h to make it available for
copy_from_kernel_nofault_allowed() in arch/x86/mm/maccess.c.

Signed-off-by: Hou Tao <houtao1@...wei.com>
---
 arch/x86/mm/fault.c       | 11 ++---------
 arch/x86/mm/mm_internal.h | 13 +++++++++++++
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 679b09cfe241c..69e007761d9a9 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -38,6 +38,8 @@
 #define CREATE_TRACE_POINTS
 #include <asm/trace/exceptions.h>
 
+#include "mm_internal.h"
+
 /*
  * Returns 0 if mmiotrace is disabled, or if the fault is not
  * handled by mmiotrace:
@@ -798,15 +800,6 @@ show_signal_msg(struct pt_regs *regs, unsigned long error_code,
 	show_opcodes(regs, loglvl);
 }
 
-/*
- * The (legacy) vsyscall page is the long page in the kernel portion
- * of the address space that has user-accessible permissions.
- */
-static bool is_vsyscall_vaddr(unsigned long vaddr)
-{
-	return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR);
-}
-
 static void
 __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
 		       unsigned long address, u32 pkey, int si_code)
diff --git a/arch/x86/mm/mm_internal.h b/arch/x86/mm/mm_internal.h
index 3f37b5c80bb32..4ebf6051e1ed7 100644
--- a/arch/x86/mm/mm_internal.h
+++ b/arch/x86/mm/mm_internal.h
@@ -2,6 +2,10 @@
 #ifndef __X86_MM_INTERNAL_H
 #define __X86_MM_INTERNAL_H
 
+#include <uapi/asm/vsyscall.h>
+
+#include <asm/page_types.h>
+
 void *alloc_low_pages(unsigned int num);
 static inline void *alloc_low_page(void)
 {
@@ -25,4 +29,13 @@ void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache);
 
 extern unsigned long tlb_single_page_flush_ceiling;
 
+/*
+ * The (legacy) vsyscall page is the long page in the kernel portion
+ * of the address space that has user-accessible permissions.
+ */
+static inline bool is_vsyscall_vaddr(unsigned long vaddr)
+{
+	return unlikely((vaddr & PAGE_MASK) == VSYSCALL_ADDR);
+}
+
 #endif	/* __X86_MM_INTERNAL_H */
-- 
2.29.2