linux-kernel - [RFC PATCH 19/73] x86/entry: Export 32-bit ignore syscall entry and __ia32

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Date: Mon, 26 Feb 2024 22:35:36 +0800
From: Lai Jiangshan <jiangshanlai@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Hou Wenlong <houwenlong.hwl@...group.com>,
	Lai Jiangshan <jiangshan.ljs@...group.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>,
	kvm@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	x86@...nel.org,
	Kees Cook <keescook@...omium.org>,
	Juergen Gross <jgross@...e.com>,
	Andy Lutomirski <luto@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [RFC PATCH 19/73] x86/entry: Export 32-bit ignore syscall entry and __ia32_enabled variable

From: Hou Wenlong <houwenlong.hwl@...group.com>

For PVM hypervisor, it ignores 32-bit syscall for guest currenlty.
Therefore, export 32-bit ignore syscall entry and __ia32_enabled
variable for PVM module.

Suggested-by: Lai Jiangshan <jiangshan.ljs@...group.com>
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.com>
---
 arch/x86/entry/common.c   | 1 +
 arch/x86/entry/entry_64.S | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 6356060caaf3..00ff701aa1be 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -141,6 +141,7 @@ static __always_inline int syscall_32_enter(struct pt_regs *regs)
 
 #ifdef CONFIG_IA32_EMULATION
 bool __ia32_enabled __ro_after_init = !IS_ENABLED(CONFIG_IA32_EMULATION_DEFAULT_DISABLED);
+EXPORT_SYMBOL_GPL(__ia32_enabled);
 
 static int ia32_emulation_override_cmdline(char *arg)
 {
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 65bfebebeab6..5b25ea4a16ae 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1527,6 +1527,7 @@ SYM_CODE_START(entry_SYSCALL32_ignore)
 	mov	$-ENOSYS, %eax
 	sysretl
 SYM_CODE_END(entry_SYSCALL32_ignore)
+EXPORT_SYMBOL_GPL(entry_SYSCALL32_ignore)
 
 .pushsection .text, "ax"
 	__FUNC_ALIGN
-- 
2.19.1.6.gb485710b