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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 6/6] xl: allow domid to be preserved on save/restore or migrate
This patch adds a '-D' command line option to save and migrate to allow
the domain id to be incorporated into the saved domain configuration and
hence be preserved.
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
v2:
- Heavily re-worked based on new libxl_domain_create_info
---
docs/man/xl.1.pod.in | 14 ++++++++++++++
tools/xl/xl.h | 1 +
tools/xl/xl_cmdtable.c | 6 ++++--
tools/xl/xl_migrate.c | 15 ++++++++++-----
tools/xl/xl_saverestore.c | 19 ++++++++++++++-----
tools/xl/xl_vmcontrol.c | 3 ++-
6 files changed, 45 insertions(+), 13 deletions(-)
diff --git a/docs/man/xl.1.pod.in b/docs/man/xl.1.pod.in
index d4b5e8e362..937eda690f 100644
--- a/docs/man/xl.1.pod.in
+++ b/docs/man/xl.1.pod.in
@@ -490,6 +490,13 @@ Display huge (!) amount of debug information during the
migration process.
Leave the domain on the receive side paused after migration.
+=item B<-D>
+
+Preserve the B<domain-id> in the domain coniguration that is transferred
+such that it will be identical on the destination host, unless that
+configuration is overridden using the B<-C> option. Note that it is not
+possible to use this option for a 'localhost' migration.
+
=back
=item B<remus> [I<OPTIONS>] I<domain-id> I<host>
@@ -692,6 +699,13 @@ Leave the domain running after creating the snapshot.
Leave the domain paused after creating the snapshot.
+=item B<-D>
+
+Preserve the B<domain-id> in the domain coniguration that is embedded in
+the state file such that it will be identical when the domain is restored,
+unless that configuration is overridden. (See the B<restore> operation
+above).
+
=back
=item B<sharing> [I<domain-id>]
diff --git a/tools/xl/xl.h b/tools/xl/xl.h
index 2b4709efb2..06569c6c4a 100644
--- a/tools/xl/xl.h
+++ b/tools/xl/xl.h
@@ -99,6 +99,7 @@ struct save_file_header {
#define SAVEFILE_BYTEORDER_VALUE ((uint32_t)0x01020304UL)
void save_domain_core_begin(uint32_t domid,
+ int preserve_domid,
const char *override_config_file,
uint8_t **config_data_r,
int *config_len_r);
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 3b302b2f20..08335394e5 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -153,7 +153,8 @@ struct cmd_spec cmd_table[] = {
"[options] <Domain> <CheckpointFile> [<ConfigFile>]",
"-h Print this help.\n"
"-c Leave domain running after creating the snapshot.\n"
- "-p Leave domain paused after creating the snapshot."
+ "-p Leave domain paused after creating the snapshot.\n"
+ "-D Store the domain id in the configration."
},
{ "migrate",
&main_migrate, 0, 1,
@@ -167,7 +168,8 @@ struct cmd_spec cmd_table[] = {
"-e Do not wait in the background (on <host>) for the
death\n"
" of the domain.\n"
"--debug Print huge (!) amount of debug during the migration
process.\n"
- "-p Do not unpause domain after migrating it."
+ "-p Do not unpause domain after migrating it.\n"
+ "-D Preserve the domain id"
},
{ "restore",
&main_restore, 0, 1,
diff --git a/tools/xl/xl_migrate.c b/tools/xl/xl_migrate.c
index 22f0429b84..0813beb801 100644
--- a/tools/xl/xl_migrate.c
+++ b/tools/xl/xl_migrate.c
@@ -176,7 +176,8 @@ static void migrate_do_preamble(int send_fd, int recv_fd,
pid_t child,
}
-static void migrate_domain(uint32_t domid, const char *rune, int debug,
+static void migrate_domain(uint32_t domid, int preserve_domid,
+ const char *rune, int debug,
const char *override_config_file)
{
pid_t child = -1;
@@ -187,7 +188,7 @@ static void migrate_domain(uint32_t domid, const char
*rune, int debug,
uint8_t *config_data;
int config_len, flags = LIBXL_SUSPEND_LIVE;
- save_domain_core_begin(domid, override_config_file,
+ save_domain_core_begin(domid, preserve_domid, override_config_file,
&config_data, &config_len);
if (!config_len) {
@@ -537,13 +538,14 @@ int main_migrate(int argc, char **argv)
char *rune = NULL;
char *host;
int opt, daemonize = 1, monitor = 1, debug = 0, pause_after_migration = 0;
+ int preserve_domid = 0;
static struct option opts[] = {
{"debug", 0, 0, 0x100},
{"live", 0, 0, 0x200},
COMMON_LONG_OPTS
};
- SWITCH_FOREACH_OPT(opt, "FC:s:ep", opts, "migrate", 2) {
+ SWITCH_FOREACH_OPT(opt, "FC:s:epD", opts, "migrate", 2) {
case 'C':
config_filename = optarg;
break;
@@ -560,6 +562,9 @@ int main_migrate(int argc, char **argv)
case 'p':
pause_after_migration = 1;
break;
+ case 'D':
+ preserve_domid = 1;
+ break;
case 0x100: /* --debug */
debug = 1;
break;
@@ -596,7 +601,7 @@ int main_migrate(int argc, char **argv)
pause_after_migration ? " -p" : "");
}
- migrate_domain(domid, rune, debug, config_filename);
+ migrate_domain(domid, preserve_domid, rune, debug, config_filename);
return EXIT_SUCCESS;
}
@@ -716,7 +721,7 @@ int main_remus(int argc, char **argv)
}
}
- save_domain_core_begin(domid, NULL, &config_data, &config_len);
+ save_domain_core_begin(domid, 0, NULL, &config_data, &config_len);
if (!config_len) {
fprintf(stderr, "No config file stored for running domain and "
diff --git a/tools/xl/xl_saverestore.c b/tools/xl/xl_saverestore.c
index 9be033fe65..953d791d1a 100644
--- a/tools/xl/xl_saverestore.c
+++ b/tools/xl/xl_saverestore.c
@@ -32,6 +32,7 @@
#ifndef LIBXL_HAVE_NO_SUSPEND_RESUME
void save_domain_core_begin(uint32_t domid,
+ int preserve_domid,
const char *override_config_file,
uint8_t **config_data_r,
int *config_len_r)
@@ -62,6 +63,8 @@ void save_domain_core_begin(uint32_t domid,
fprintf(stderr, "unable to retrieve domain configuration\n");
exit(EXIT_FAILURE);
}
+
+ d_config.c_info.domid = preserve_domid ? domid : 0;
}
config_c = libxl_domain_config_to_json(ctx, &d_config);
@@ -120,14 +123,15 @@ void save_domain_core_writeconfig(int fd, const char
*source,
hdr.optional_data_len);
}
-static int save_domain(uint32_t domid, const char *filename, int checkpoint,
- int leavepaused, const char *override_config_file)
+static int save_domain(uint32_t domid, int preserve_domid,
+ const char *filename, int checkpoint,
+ int leavepaused, const char *override_config_file)
{
int fd;
uint8_t *config_data;
int config_len;
- save_domain_core_begin(domid, override_config_file,
+ save_domain_core_begin(domid, preserve_domid, override_config_file,
&config_data, &config_len);
if (!config_len) {
@@ -236,15 +240,19 @@ int main_save(int argc, char **argv)
const char *config_filename = NULL;
int checkpoint = 0;
int leavepaused = 0;
+ int preserve_domid = 0;
int opt;
- SWITCH_FOREACH_OPT(opt, "cp", NULL, "save", 2) {
+ SWITCH_FOREACH_OPT(opt, "cpD", NULL, "save", 2) {
case 'c':
checkpoint = 1;
break;
case 'p':
leavepaused = 1;
break;
+ case 'D':
+ preserve_domid = 1;
+ break;
}
if (argc-optind > 3) {
@@ -257,7 +265,8 @@ int main_save(int argc, char **argv)
if ( argc - optind >= 3 )
config_filename = argv[optind + 2];
- save_domain(domid, filename, checkpoint, leavepaused, config_filename);
+ save_domain(domid, preserve_domid, filename, checkpoint, leavepaused,
+ config_filename);
return EXIT_SUCCESS;
}
diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index 39292acfe6..2e2d427492 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -899,7 +899,8 @@ start:
autoconnect_console_how = 0;
}
- d_config.c_info.domid = domid_policy;
+ if (!libxl_domid_valid_guest(d_config.c_info.domid))
+ d_config.c_info.domid = domid_policy;
if ( restoring ) {
libxl_domain_restore_params params;
--
2.20.1
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