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replay: command line options

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This patch introduces command line options for enabling recording or replaying
virtual machine behavior. These options are added to icount command line
parameter. They include 'rr' which switches between record and replay
and 'rrfile' for specifying the filename for replay log.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162518.8676.70792.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2015-09-17 19:25:18 +03:00 committed by Paolo Bonzini
parent 0194749ac4
commit 4c27b85972
3 changed files with 22 additions and 5 deletions
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8
qemu-options.hx
View File

@ -3157,12 +3157,12 @@ re-inject them.
ETEXI
DEF("icount", HAS_ARG, QEMU_OPTION_icount, \
"-icount [shift=N|auto][,align=on|off][,sleep=no]\n" \
"-icount [shift=N|auto][,align=on|off][,sleep=no,rr=record|replay,rrfile=<filename>]\n" \
" enable virtual instruction counter with 2^N clock ticks per\n" \
" instruction, enable aligning the host and virtual clocks\n" \
" or disable real time cpu sleeping\n", QEMU_ARCH_ALL)
STEXI
@item -icount [shift=@var{N}|auto]
@item -icount [shift=@var{N}|auto][,rr=record|replay,rrfile=@var{filename}]
@findex -icount
Enable virtual instruction counter. The virtual cpu will execute one
instruction every 2^@var{N} ns of virtual time. If @code{auto} is specified
@ -3191,6 +3191,10 @@ Currently this option does not work when @option{shift} is @code{auto}.
Note: The sync algorithm will work for those shift values for which
the guest clock runs ahead of the host clock. Typically this happens
when the shift value is high (how high depends on the host machine).
When @option{rr} option is specified deterministic record/replay is enabled.
Replay log is written into @var{filename} file in record mode and
read from this file in replay mode.
ETEXI
DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \

4
replay/replay.c
View File

@ -295,6 +295,10 @@ void replay_start(void)
error_get_pretty(replay_blockers->data));
exit(1);
}
if (!use_icount) {
error_report("Please enable icount to use record/replay");
exit(1);
}
/* Timer for snapshotting will be set up here. */

15
vl.c
View File

@ -476,6 +476,12 @@ static QemuOptsList qemu_icount_opts = {
}, {
.name = "sleep",
.type = QEMU_OPT_BOOL,
}, {
.name = "rr",
.type = QEMU_OPT_STRING,
}, {
.name = "rrfile",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
@ -4014,6 +4020,8 @@ int main(int argc, char **argv, char **envp)
}
}
replay_configure(icount_opts);
opts = qemu_get_machine_opts();
optarg = qemu_opt_get(opts, "type");
if (optarg) {
@ -4447,9 +4455,10 @@ int main(int argc, char **argv, char **envp)
}
/* open the virtual block devices */
if (snapshot)
qemu_opts_foreach(qemu_find_opts("drive"),
drive_enable_snapshot, NULL, NULL);
if (snapshot || replay_mode != REPLAY_MODE_NONE) {
qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot,
NULL, NULL);
}
if (qemu_opts_foreach(qemu_find_opts("drive"), drive_init_func,
&machine_class->block_default_type, NULL)) {
exit(1);