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Date:   Tue, 05 May 2020 15:44:10 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>
Subject: [patch V4 part 3 16/29] x86/entry: Convert Bounds exception to IDTENTRY

From: Thomas Gleixner <tglx@...utronix.de>

Convert #BR to IDTENTRY:
  - Implement the C entry point with DEFINE_IDTENTRY
  - Emit the ASM stub with DECLARE_IDTENTRY
  - Remove the ASM idtentry in 64bit
  - Remove the open coded ASM entry code in 32bit
  - Fixup the XEN/PV code
  - Remove the old prototyoes
  - Remove the RCU warning as the new entry macro ensures correctness

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/x86/entry/entry_32.S       |    7 -------
 arch/x86/entry/entry_64.S       |    1 -
 arch/x86/include/asm/idtentry.h |    1 +
 arch/x86/include/asm/traps.h    |    3 ---
 arch/x86/kernel/idt.c           |    2 +-
 arch/x86/kernel/traps.c         |    9 ++++-----
 arch/x86/xen/enlighten_pv.c     |    2 +-
 arch/x86/xen/xen-asm_64.S       |    2 +-
 8 files changed, 8 insertions(+), 19 deletions(-)

--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1325,13 +1325,6 @@ SYM_CODE_START(native_iret)
 SYM_CODE_END(native_iret)
 #endif
 
-SYM_CODE_START(bounds)
-	ASM_CLAC
-	pushl	$0
-	pushl	$do_bounds
-	jmp	common_exception
-SYM_CODE_END(bounds)
-
 SYM_CODE_START(invalid_op)
 	ASM_CLAC
 	pushl	$0
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1074,7 +1074,6 @@ apicinterrupt IRQ_WORK_VECTOR			irq_work
  */
 
 idtentry	X86_TRAP_BP		int3			do_int3				has_error_code=0
-idtentry	X86_TRAP_BR		bounds			do_bounds			has_error_code=0
 idtentry	X86_TRAP_UD		invalid_op		do_invalid_op			has_error_code=0
 idtentry	X86_TRAP_NM		device_not_available	do_device_not_available		has_error_code=0
 idtentry	X86_TRAP_OLD_MF		coprocessor_segment_overrun	do_coprocessor_segment_overrun	has_error_code=0
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -79,5 +79,6 @@ static __always_inline void __##func(str
 /* Simple exception entry points. No hardware error code */
 DECLARE_IDTENTRY(X86_TRAP_DE,		exc_divide_error);
 DECLARE_IDTENTRY(X86_TRAP_OF,		exc_overflow);
+DECLARE_IDTENTRY(X86_TRAP_BR,		exc_bounds);
 
 #endif
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -14,7 +14,6 @@
 asmlinkage void debug(void);
 asmlinkage void nmi(void);
 asmlinkage void int3(void);
-asmlinkage void bounds(void);
 asmlinkage void invalid_op(void);
 asmlinkage void device_not_available(void);
 #ifdef CONFIG_X86_64
@@ -39,7 +38,6 @@ asmlinkage void simd_coprocessor_error(v
 asmlinkage void xen_xennmi(void);
 asmlinkage void xen_xendebug(void);
 asmlinkage void xen_int3(void);
-asmlinkage void xen_bounds(void);
 asmlinkage void xen_invalid_op(void);
 asmlinkage void xen_device_not_available(void);
 asmlinkage void xen_double_fault(void);
@@ -61,7 +59,6 @@ asmlinkage void xen_simd_coprocessor_err
 dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
 dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
 dotraplinkage void do_int3(struct pt_regs *regs, long error_code);
-dotraplinkage void do_bounds(struct pt_regs *regs, long error_code);
 dotraplinkage void do_invalid_op(struct pt_regs *regs, long error_code);
 dotraplinkage void do_device_not_available(struct pt_regs *regs, long error_code);
 #if defined(CONFIG_X86_64) || defined(CONFIG_DOUBLEFAULT)
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -72,7 +72,7 @@ static const __initconst struct idt_data
 static const __initconst struct idt_data def_idts[] = {
 	INTG(X86_TRAP_DE,		asm_exc_divide_error),
 	INTG(X86_TRAP_NMI,		nmi),
-	INTG(X86_TRAP_BR,		bounds),
+	INTG(X86_TRAP_BR,		asm_exc_bounds),
 	INTG(X86_TRAP_UD,		invalid_op),
 	INTG(X86_TRAP_NM,		device_not_available),
 	INTG(X86_TRAP_OLD_MF,		coprocessor_segment_overrun),
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -402,18 +402,17 @@ dotraplinkage void do_double_fault(struc
 }
 #endif
 
-dotraplinkage void do_bounds(struct pt_regs *regs, long error_code)
+DEFINE_IDTENTRY(exc_bounds)
 {
-	RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
-	if (notify_die(DIE_TRAP, "bounds", regs, error_code,
+	if (notify_die(DIE_TRAP, "bounds", regs, 0,
 			X86_TRAP_BR, SIGSEGV) == NOTIFY_STOP)
 		return;
 	cond_local_irq_enable(regs);
 
 	if (!user_mode(regs))
-		die("bounds", regs, error_code);
+		die("bounds", regs, 0);
 
-	do_trap(X86_TRAP_BR, SIGSEGV, "bounds", regs, error_code, 0, NULL);
+	do_trap(X86_TRAP_BR, SIGSEGV, "bounds", regs, 0, 0, NULL);
 
 	cond_local_irq_disable(regs);
 }
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -624,7 +624,7 @@ static struct trap_array_entry trap_arra
 #endif
 	{ page_fault,                  xen_page_fault,                  false },
 	TRAP_ENTRY(exc_divide_error,			false ),
-	{ bounds,                      xen_bounds,                      false },
+	TRAP_ENTRY(exc_bounds,				false ),
 	{ invalid_op,                  xen_invalid_op,                  false },
 	{ device_not_available,        xen_device_not_available,        false },
 	{ coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false },
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -34,7 +34,7 @@ xen_pv_trap xendebug
 xen_pv_trap int3
 xen_pv_trap xennmi
 xen_pv_trap asm_exc_overflow
-xen_pv_trap bounds
+xen_pv_trap asm_exc_bounds
 xen_pv_trap invalid_op
 xen_pv_trap device_not_available
 xen_pv_trap double_fault

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