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Message-Id: <20230623111409.3047467-2-nik.borisov@suse.com>
Date: Fri, 23 Jun 2023 14:14:04 +0300
From: Nikolay Borisov <nik.borisov@...e.com>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, mohocko@...e.com, jslaby@...e.cz,
Nikolay Borisov <nik.borisov@...e.com>
Subject: [PATCH v4 1/6] x86: Introduce ia32_enabled()
IA32 support on 64bit kernels depends on whether CONFIG_IA32_EMULATION
is selected or not. As it is a compile time option it doesn't
provide the flexibility to have distributions set their own policy for
IA32 support and give the user the flexibility to override it.
As a first step introduce ia32_enabled() which abstracts whether IA32
compat is turned on or off. Upcoming patches will implement
the ability to set IA32 compat state at boot time.
Signed-off-by: Nikolay Borisov <nik.borisov@...e.com>
---
arch/x86/entry/common.c | 4 ++++
arch/x86/include/asm/ia32.h | 16 +++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 6c2826417b33..ef5a154a7413 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -96,6 +96,10 @@ static __always_inline int syscall_32_enter(struct pt_regs *regs)
return (int)regs->orig_ax;
}
+#ifdef CONFIG_IA32_EMULATION
+bool __ia32_enabled = true;
+#endif
+
/*
* Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL.
*/
diff --git a/arch/x86/include/asm/ia32.h b/arch/x86/include/asm/ia32.h
index fada857f0a1e..5a2ae24b1204 100644
--- a/arch/x86/include/asm/ia32.h
+++ b/arch/x86/include/asm/ia32.h
@@ -68,6 +68,20 @@ extern void ia32_pick_mmap_layout(struct mm_struct *mm);
#endif
-#endif /* CONFIG_IA32_EMULATION */
+extern bool __ia32_enabled;
+
+static inline bool ia32_enabled(void)
+{
+ return __ia32_enabled;
+}
+
+#else /* !CONFIG_IA32_EMULATION */
+
+static inline bool ia32_enabled(void)
+{
+ return IS_ENABLED(CONFIG_X86_32);
+}
+
+#endif
#endif /* _ASM_X86_IA32_H */
--
2.34.1
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