linux-kernel - [patch 03/16] x86/idtentry: Provide IDTENTRY

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Message-Id: <20200225224144.421221583@linutronix.de>
Date:   Tue, 25 Feb 2020 23:33:24 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [patch 03/16] x86/idtentry: Provide IDTENTRY_XEN for XEN/PV

XEN/PV has special wrappers for NMI and DB exceptions. They redirect these
exceptions through regular IDTENTRY points. Provide the necessary IDTENTRY
macros to make this work

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/idtentry.h |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -163,6 +163,18 @@ static __always_inline void __##func(str
 #define DECLARE_IDTENTRY_DEBUG		DECLARE_IDTENTRY_IST
 #define DEFINE_IDTENTRY_DEBUG		DEFINE_IDTENTRY_IST
 
+/**
+ * DECLARE_IDTENTRY_XEN - Declare functions for XEN redirect IDT entry points
+ * @vector:	Vector number (ignored for C)
+ * @func:	Function name of the entry point
+ *
+ * Used for xennmi and xendebug redirections. No DEFINE as this is all
+ * indirection magic.
+ */
+#define DECLARE_IDTENTRY_XEN(vector, func)			\
+	asmlinkage void xen_asm_exc_xen##func(void);		\
+	asmlinkage void asm_exc_xen##func(void)
+
 #else /* !__ASSEMBLY__ */
 
 /* Defines for ASM code to construct the IDT entries */
@@ -191,7 +203,11 @@ static __always_inline void __##func(str
 #endif
 
 /* No ASM code emitted for NMI */
-# define DECLARE_IDTENTRY_NMI(vector, func)
+#define DECLARE_IDTENTRY_NMI(vector, func)
+
+/* XEN NMI and DB wrapper */
+#define DECLARE_IDTENTRY_XEN(vector, func)			\
+	idtentry vector asm_exc_xen##func exc_##func has_error_code=0
 
 #endif /* __ASSEMBLY__ */