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x86/idtentry: Provide IDTRENTRY_NOIST variants for #DB and #MC

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Provide NOIST entry point macros which allows to implement NOIST variants
of the C entry points. These are invoked when #DB or #MC enter from user
space. This allows explicit handling of the difference between user mode
and kernel mode entry later.

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/20200505135315.084882104@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:33:28 +01:00
parent df7ccaffd2
commit f08e32ec3c
1 changed files with 17 additions and 2 deletions
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19
arch/x86/include/asm/idtentry.h
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@ -138,10 +138,12 @@ __visible noinstr void func(struct pt_regs *regs)
* @vector: Vector number (ignored for C)
* @func: Function name of the entry point
*
* Maps to DECLARE_IDTENTRY_RAW
* Maps to DECLARE_IDTENTRY_RAW, but declares also the NOIST C handler
* which is called from the ASM entry point on user mode entry
*/
#define DECLARE_IDTENTRY_IST(vector, func) \
DECLARE_IDTENTRY_RAW(vector, func)
DECLARE_IDTENTRY_RAW(vector, func); \
__visible void noist_##func(struct pt_regs *regs)
/**
* DEFINE_IDTENTRY_IST - Emit code for IST entry points
@ -152,6 +154,17 @@ __visible noinstr void func(struct pt_regs *regs)
#define DEFINE_IDTENTRY_IST(func) \
DEFINE_IDTENTRY_RAW(func)
/**
* DEFINE_IDTENTRY_NOIST - Emit code for NOIST entry points which
* belong to a IST entry point (MCE, DB)
* @func: Function name of the entry point. Must be the same as
* the function name of the corresponding IST variant
*
* Maps to DEFINE_IDTENTRY_RAW().
*/
#define DEFINE_IDTENTRY_NOIST(func) \
DEFINE_IDTENTRY_RAW(noist_##func)
#else /* CONFIG_X86_64 */
/* Maps to a regular IDTENTRY on 32bit for now */
# define DECLARE_IDTENTRY_IST DECLARE_IDTENTRY
@ -161,12 +174,14 @@ __visible noinstr void func(struct pt_regs *regs)
/* C-Code mapping */
#define DECLARE_IDTENTRY_MCE DECLARE_IDTENTRY_IST
#define DEFINE_IDTENTRY_MCE DEFINE_IDTENTRY_IST
#define DEFINE_IDTENTRY_MCE_USER DEFINE_IDTENTRY_NOIST
#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
#define DEFINE_IDTENTRY_DEBUG_USER DEFINE_IDTENTRY_NOIST
/**
* DECLARE_IDTENTRY_XEN - Declare functions for XEN redirect IDT entry points