x86/idtentry: Provide IDTENTRY_XEN for XEN/PV (9cce81cf) · Commits · 戴 / test

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@linutronix.de> Reviewed-by:

Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by:

Peter Zijlstra <peterz@infradead.org> Acked-by:

Andy Lutomirski <luto@kernel.org> Link: https://lkml.kernel.org/r/20200505135314.518622698@linutronix.de

arch/x86/include/asm/idtentry.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -168,6 +168,18 @@ __visible noinstr void func(struct pt_regs *regs)
		#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 ASM
		* 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__ */

		/*
		@@ -203,6 +215,10 @@ __visible noinstr void func(struct pt_regs *regs)
		/* No ASM code emitted for NMI */
		#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 sane=1

		#endif /* __ASSEMBLY__ */

		/*

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