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icount: fix shift=auto for record/replay

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This patch fixes shift=auto when record/replay is enabled.
Now user does not need to guess the best shift value.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>

--

v2:
  moved icount_time_shift to vmstate subsection
Message-Id: <158988500050.15192.692077802469400393.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-05-19 13:43:20 +03:00 committed by Paolo Bonzini
parent ea81f98bce
commit b8164e68e5
1 changed files with 19 additions and 1 deletions
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20
cpus.c
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@ -379,7 +379,8 @@ static void icount_adjust(void)
seqlock_write_lock(&timers_state.vm_clock_seqlock,
&timers_state.vm_clock_lock);
cur_time = cpu_get_clock_locked();
cur_time = REPLAY_CLOCK_LOCKED(REPLAY_CLOCK_VIRTUAL_RT,
cpu_get_clock_locked());
cur_icount = cpu_get_icount_locked();
delta = cur_icount - cur_time;
@ -647,6 +648,11 @@ static bool adjust_timers_state_needed(void *opaque)
return s->icount_rt_timer != NULL;
}
static bool shift_state_needed(void *opaque)
{
return use_icount == 2;
}
/*
* Subsection for warp timer migration is optional, because may not be created
*/
@ -674,6 +680,17 @@ static const VMStateDescription icount_vmstate_adjust_timers = {
}
};
static const VMStateDescription icount_vmstate_shift = {
.name = "timer/icount/shift",
.version_id = 1,
.minimum_version_id = 1,
.needed = shift_state_needed,
.fields = (VMStateField[]) {
VMSTATE_INT16(icount_time_shift, TimersState),
VMSTATE_END_OF_LIST()
}
};
/*
* This is a subsection for icount migration.
*/
@ -690,6 +707,7 @@ static const VMStateDescription icount_vmstate_timers = {
.subsections = (const VMStateDescription*[]) {
&icount_vmstate_warp_timer,
&icount_vmstate_adjust_timers,
&icount_vmstate_shift,
NULL
}
};