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replay: vmstate for replay module 

This patch introduces vmstate for replay data structures.
It allows saving and loading vmstate while replaying.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20160926080810.6992.68420.stgit@PASHA-ISP>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2016-09-26 11:08:10 +03:00 committed by Paolo Bonzini
parent f186d64d8f
commit 306e196fa2
4 changed files with 71 additions and 0 deletions
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1
replay/Makefile.objs
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@ -4,3 +4,4 @@ common-obj-y += replay-events.o
common-obj-y += replay-time.o
common-obj-y += replay-input.o
common-obj-y += replay-char.o
common-obj-y += replay-snapshot.o

9
replay/replay-internal.h
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@ -66,6 +66,8 @@ typedef struct ReplayState {
unsigned int data_kind;
/*! Flag which indicates that event is not processed yet. */
unsigned int has_unread_data;
/*! Temporary variable for saving current log offset. */
uint64_t file_offset;
} ReplayState;
extern ReplayState replay_state;
@ -157,4 +159,11 @@ void replay_event_char_read_save(void *opaque);
/*! Reads char event read from the file. */
void *replay_event_char_read_load(void);
/* VMState-related functions */
/* Registers replay VMState.
Should be called before virtual devices initialization
to make cached timers available for post_load functions. */
void replay_vmstate_register(void);
#endif

60
replay/replay-snapshot.c Normal file
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@ -0,0 +1,60 @@
/*
* replay-snapshot.c
*
* Copyright (c) 2010-2016 Institute for System Programming
* of the Russian Academy of Sciences.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "sysemu/sysemu.h"
#include "monitor/monitor.h"
#include "qapi/qmp/qstring.h"
#include "qemu/error-report.h"
#include "migration/vmstate.h"
static void replay_pre_save(void *opaque)
{
ReplayState *state = opaque;
state->file_offset = ftell(replay_file);
}
static int replay_post_load(void *opaque, int version_id)
{
ReplayState *state = opaque;
fseek(replay_file, state->file_offset, SEEK_SET);
/* If this was a vmstate, saved in recording mode,
we need to initialize replay data fields. */
replay_fetch_data_kind();
return 0;
}
static const VMStateDescription vmstate_replay = {
.name = "replay",
.version_id = 1,
.minimum_version_id = 1,
.pre_save = replay_pre_save,
.post_load = replay_post_load,
.fields = (VMStateField[]) {
VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
VMSTATE_UINT64(current_step, ReplayState),
VMSTATE_INT32(instructions_count, ReplayState),
VMSTATE_UINT32(data_kind, ReplayState),
VMSTATE_UINT32(has_unread_data, ReplayState),
VMSTATE_UINT64(file_offset, ReplayState),
VMSTATE_END_OF_LIST()
},
};
void replay_vmstate_register(void)
{
vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
}

1
replay/replay.c
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@ -292,6 +292,7 @@ void replay_configure(QemuOpts *opts)
exit(1);
}
replay_vmstate_register();
replay_enable(fname, mode);
out: