[tip: x86/entry] x86/idtentry: Provide IDTENTRY_IST

[tip-bot2 for Thomas Gleixner]

The following commit has been merged into the x86/entry branch of tip:

Commit-ID:     2f2ed27cb62200e4faa2a088131e972e26b5b585
Gitweb:        https://git.kernel.org/tip/2f2ed27cb62200e4faa2a088131e972e26b5b585
Author:        Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate:    Tue, 25 Feb 2020 23:33:22 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 19 May 2020 16:04:07 +02:00

x86/idtentry: 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@xxxxxxxxxxxxx>
Reviewed-by: Alexandre Chartre <alexandre.chartre@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200505135314.137125609@xxxxxxxxxxxxx



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

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 3dc4d5b..3edd6d0 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -132,6 +132,42 @@ static __always_inline void __##func(struct pt_regs *regs,		\
 #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 @@ __visible noinstr void func(struct pt_regs *regs)
 #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__ */
 
 /*