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um: Implement time-travel=ext

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This implements synchronized time-travel mode which - using a special
application on a unix socket - lets multiple machines take part in a
time-travelling simulation together.

The protocol for the unix domain socket is defined in the new file
include/uapi/linux/um_timetravel.h.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg
2020-02-13 14:26:47 +01:00
committed by Richard Weinberger
parent dd9ada5627
commit 88ce642492
7 changed files with 563 additions and 17 deletions
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27
arch/um/include/linux/time-internal.h
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@@ -15,6 +15,7 @@ enum time_travel_mode {
TT_MODE_OFF,
TT_MODE_BASIC,
TT_MODE_INFCPU,
TT_MODE_EXTERNAL,
};
#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
@@ -35,6 +36,24 @@ time_travel_set_event_fn(struct time_travel_event *e,
{
e->fn = fn;
}
void __time_travel_propagate_time(void);
static inline void time_travel_propagate_time(void)
{
if (time_travel_mode == TT_MODE_EXTERNAL)
__time_travel_propagate_time();
}
void __time_travel_wait_readable(int fd);
static inline void time_travel_wait_readable(int fd)
{
if (time_travel_mode == TT_MODE_EXTERNAL)
__time_travel_wait_readable(fd);
}
void time_travel_add_irq_event(struct time_travel_event *e);
#else
struct time_travel_event {
};
@@ -47,5 +66,13 @@ static inline void time_travel_sleep(unsigned long long duration)
/* this is a macro so the event/function need not exist */
#define time_travel_set_event_fn(e, fn) do {} while (0)
static inline void time_travel_propagate_time(void)
{
}
static inline void time_travel_wait_readable(int fd)
{
}
#endif /* CONFIG_UML_TIME_TRAVEL_SUPPORT */
#endif /* __TIMER_INTERNAL_H__ */

1
arch/um/include/shared/os.h
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@@ -181,6 +181,7 @@ extern int os_falloc_punch(int fd, unsigned long long offset, int count);
extern int os_eventfd(unsigned int initval, int flags);
extern int os_sendmsg_fds(int fd, const void *buf, unsigned int len,
const int *fds, unsigned int fds_num);
int os_poll(unsigned int n, const int *fds);
/* start_up.c */
extern void os_early_checks(void);