linux-kernel - [patch V4 part 4 08/24] x86/entry: Provide IDTENTRY

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Date:   Tue, 05 May 2020 15:49:34 +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 4 08/24] x86/entry: Provide IDTENTRY_IST

Same as IDTENTRY but for exceptions which run on Interrupt STacks (IST) on
64bit. For 32bit this maps to IDTENTRY.

There are 3 variants which will be used:
      IDTENTRY_MCE
      IDTENTRY_DB
      IDTENTRY_NMI

These map to IDTENTRY_IST, but only the MCE and DB variants are emitting
ASM code as the NMI entry needs hand crafted ASM still.

The function defines do not contain any idtenter/exit calls as these
exceptions need special treatment.

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


---
 arch/x86/include/asm/idtentry.h |   54 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -132,6 +132,42 @@ static __always_inline void __##func(str
 #define DEFINE_IDTENTRY_RAW(func)					\
 __visible noinstr void func(struct pt_regs *regs)
 
+#ifdef CONFIG_X86_64
+/**
+ * DECLARE_IDTENTRY_IST - Declare functions for IST handling IDT entry points
+ * @vector:	Vector number (ignored for C)
+ * @func:	Function name of the entry point
+ *
+ * Maps to DECLARE_IDTENTRY_RAW
+ */
+#define DECLARE_IDTENTRY_IST(vector, func)				\
+	DECLARE_IDTENTRY_RAW(vector, func)
+
+/**
+ * DEFINE_IDTENTRY_IST - Emit code for IST entry points
+ * @func:	Function name of the entry point
+ *
+ * Maps to DEFINE_IDTENTRY_RAW
+ */
+#define DEFINE_IDTENTRY_IST(func)					\
+	DEFINE_IDTENTRY_RAW(func)
+
+#else	/* CONFIG_X86_64 */
+/* Maps to a regular IDTENTRY on 32bit for now */
+# define DECLARE_IDTENTRY_IST		DECLARE_IDTENTRY
+# define DEFINE_IDTENTRY_IST		DEFINE_IDTENTRY
+#endif	/* !CONFIG_X86_64 */
+
+/* C-Code mapping */
+#define DECLARE_IDTENTRY_MCE		DECLARE_IDTENTRY_IST
+#define DEFINE_IDTENTRY_MCE		DEFINE_IDTENTRY_IST
+
+#define DECLARE_IDTENTRY_NMI		DECLARE_IDTENTRY_IST
+#define DEFINE_IDTENTRY_NMI		DEFINE_IDTENTRY_IST
+
+#define DECLARE_IDTENTRY_DEBUG		DECLARE_IDTENTRY_IST
+#define DEFINE_IDTENTRY_DEBUG		DEFINE_IDTENTRY_IST
+
 #else /* !__ASSEMBLY__ */
 
 /*
@@ -149,6 +185,24 @@ static __always_inline void __##func(str
 #define DECLARE_IDTENTRY_RAW(vector, func)				\
 	DECLARE_IDTENTRY(vector, func)
 
+#ifdef CONFIG_X86_64
+# define DECLARE_IDTENTRY_MCE(vector, func)				\
+	idtentry_mce_db vector asm_##func func
+
+# define DECLARE_IDTENTRY_DEBUG(vector, func)				\
+	idtentry_mce_db vector asm_##func func
+
+#else
+# define DECLARE_IDTENTRY_MCE(vector, func)				\
+	DECLARE_IDTENTRY(vector, func)
+
+# define DECLARE_IDTENTRY_DEBUG(vector, func)				\
+	DECLARE_IDTENTRY(vector, func)
+#endif
+
+/* No ASM code emitted for NMI */
+#define DECLARE_IDTENTRY_NMI(vector, func)
+
 #endif /* __ASSEMBLY__ */
 
 /*