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x86/idtentry: Provide IDTENTRY_XEN for XEN/PV

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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
This commit is contained in:
Thomas Gleixner 2020-02-25 23:33:24 +01:00
parent aedbdeab00
commit 9cce81cff7
1 changed files with 16 additions and 0 deletions
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16
arch/x86/include/asm/idtentry.h
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@ -168,6 +168,18 @@ __visible noinstr void func(struct pt_regs *regs)
#define DECLARE_IDTENTRY_DEBUG DECLARE_IDTENTRY_IST #define DECLARE_IDTENTRY_DEBUG DECLARE_IDTENTRY_IST
#define DEFINE_IDTENTRY_DEBUG DEFINE_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__ */ #else /* !__ASSEMBLY__ */
/* /*
@ -203,6 +215,10 @@ __visible noinstr void func(struct pt_regs *regs)
/* No ASM code emitted for NMI */ /* 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 sane=1
#endif /* __ASSEMBLY__ */ #endif /* __ASSEMBLY__ */
/* /*