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context_tracking: Move exception handling to generic code

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Exceptions handling on context tracking should share common
treatment: on entry we exit user mode if the exception triggered
in that context. Then on exception exit we return to that previous
context.

Generalize this to avoid duplication across archs.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Mats Liljegren <mats.liljegren@enea.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Frederic Weisbecker 2013-02-24 00:23:25 +01:00
parent 6dbe51c251
commit 56dd9470d7
5 changed files with 19 additions and 26 deletions
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21
arch/x86/include/asm/context_tracking.h
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@ -1,31 +1,10 @@
#ifndef _ASM_X86_CONTEXT_TRACKING_H
#define _ASM_X86_CONTEXT_TRACKING_H
#ifndef __ASSEMBLY__
#include <linux/context_tracking.h>
#include <asm/ptrace.h>
static inline void exception_enter(struct pt_regs *regs)
{
user_exit();
}
static inline void exception_exit(struct pt_regs *regs)
{
#ifdef CONFIG_CONTEXT_TRACKING
if (user_mode(regs))
user_enter();
#endif
}
#else /* __ASSEMBLY__ */
#ifdef CONFIG_CONTEXT_TRACKING
# define SCHEDULE_USER call schedule_user
#else
# define SCHEDULE_USER call schedule
#endif
#endif /* !__ASSEMBLY__ */
#endif

2
arch/x86/kernel/kvm.c
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@ -20,6 +20,7 @@
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*/
#include <linux/context_tracking.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kvm_para.h>
@ -43,7 +44,6 @@
#include <asm/apicdef.h>
#include <asm/hypervisor.h>
#include <asm/kvm_guest.h>
#include <asm/context_tracking.h>
static int kvmapf = 1;

3
arch/x86/kernel/traps.c
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@ -12,6 +12,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/context_tracking.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/spinlock.h>
@ -55,8 +56,6 @@
#include <asm/i387.h>
#include <asm/fpu-internal.h>
#include <asm/mce.h>
#include <asm/context_tracking.h>
#include <asm/mach_traps.h>
#ifdef CONFIG_X86_64

2
arch/x86/mm/fault.c
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@ -13,12 +13,12 @@
#include <linux/perf_event.h> /* perf_sw_event */
#include <linux/hugetlb.h> /* hstate_index_to_shift */
#include <linux/prefetch.h> /* prefetchw */
#include <linux/context_tracking.h> /* exception_enter(), ... */
#include <asm/traps.h> /* dotraplinkage, ... */
#include <asm/pgalloc.h> /* pgd_*(), ... */
#include <asm/kmemcheck.h> /* kmemcheck_*(), ... */
#include <asm/fixmap.h> /* VSYSCALL_START */
#include <asm/context_tracking.h> /* exception_enter(), ... */
/*
* Page fault error code bits:

17
include/linux/context_tracking.h
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@ -1,10 +1,11 @@
#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H
#ifdef CONFIG_CONTEXT_TRACKING
#include <linux/sched.h>
#include <linux/percpu.h>
#include <asm/ptrace.h>
#ifdef CONFIG_CONTEXT_TRACKING
struct context_tracking {
/*
* When active is false, probes are unset in order
@ -33,12 +34,26 @@ static inline bool context_tracking_active(void)
extern void user_enter(void);
extern void user_exit(void);
static inline void exception_enter(struct pt_regs *regs)
{
user_exit();
}
static inline void exception_exit(struct pt_regs *regs)
{
if (user_mode(regs))
user_enter();
}
extern void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next);
#else
static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline void exception_enter(struct pt_regs *regs) { }
static inline void exception_exit(struct pt_regs *regs) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */