Re: [PATCH v13.1 26/26] cmdline switches and config vars to control colo-proxy

[Ian Jackson <Ian.Jackson@eu.citrix.com>]

Changlong Xie writes ("[PATCH v13.1 26/26] cmdline switches and config vars to control colo-proxy"):
>  From 1bfd14622455635c6cae6130396250996e49facc Mon Sep 17 00:00:00 2001
> From: Wen Congyang <wency@cn.fujitsu.com>
> Date: Wed, 15 Jul 2015 17:18:56 +0800
> Subject: [PATCH v13.1 26/26] cmdline switches and config vars to control 
> colo-proxy

I found a proper copy of this in:
  https://github.com/Pating/xen.git#27e64fe8a495

That commit is

Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

Ian.

From 27e64fe8a4954b5a5628696160471f89a9e6ae6e Mon Sep 17 00:00:00 2001
From: Wen Congyang <wency@cn.fujitsu.com>
Date: Wed, 15 Jul 2015 17:18:56 +0800
Subject: [PATCH 27/28] cmdline switches and config vars to control colo-proxy

Add cmdline switches to 'xl migrate-receive' command to specify
a domain-specific hotplug script to setup COLO proxy.

Add a new config var 'colo.default.agentscript' to xl.conf, that
allows the user to override the default global script used to
setup COLO proxy.

Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
---
 docs/man/xl.conf.pod.5           |    6 +++++
 docs/man/xl.pod.1                |    7 ++++--
 tools/libxl/libxl.c              |    6 +++++
 tools/libxl/libxl_colo_restore.c |    5 ++++
 tools/libxl/libxl_create.c       |    9 ++++++--
 tools/libxl/libxl_types.idl      |    1 +
 tools/libxl/xl.c                 |    3 +++
 tools/libxl/xl.h                 |    1 +
 tools/libxl/xl_cmdimpl.c         |   47 ++++++++++++++++++++++++++++++--------
 9 files changed, 71 insertions(+), 14 deletions(-)

diff --git a/docs/man/xl.conf.pod.5 b/docs/man/xl.conf.pod.5
index 8ae19bb..8f7fd28 100644
--- a/docs/man/xl.conf.pod.5
+++ b/docs/man/xl.conf.pod.5
@@ -111,6 +111,12 @@ Configures the default script used by Remus to setup network buffering.
 
 Default: C</etc/xen/scripts/remus-netbuf-setup>
 
+=item B<colo.default.proxyscript="PATH">
+
+Configures the default script used by COLO to setup colo-proxy.
+
+Default: C</etc/xen/scripts/colo-proxy-setup>
+
 =item B<output_format="json|sxp">
 
 Configures the default output format used by xl when printing "machine
diff --git a/docs/man/xl.pod.1 b/docs/man/xl.pod.1
index 2664402..9df3302 100644
--- a/docs/man/xl.pod.1
+++ b/docs/man/xl.pod.1
@@ -458,8 +458,6 @@ Remus support in xl is still in experimental (proof-of-concept) phase.
 Disk replication support is limited to DRBD disks.
 
 COLO support in xl is still in experimental (proof-of-concept) phase.
-There is no support for network, so the guest will confuse its network
-peers at the moment.
 
 =back
 
@@ -483,6 +481,11 @@ and it's used by secondary.
 =item B<hidden-disk>    :Primary's modified contents will be buffered in this
 disk, and it's used by secondary.
 
+(b) An example for COLO network configuration: vif =[ '...,forwarddev=xxx,...']
+
+=item B<forwarddev>     :Forward devices for primary and secondary, there are
+directly connected.
+
 Note that the COLO configuration settings should be considered unstable. They
 may change incompatibly in future versions of Xen.
 
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 63fbe16..aabf3a7 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3378,6 +3378,11 @@ void libxl__device_nic_add(libxl__egc *egc, uint32_t domid,
         flexarray_append(back, nic->ifname);
     }
 
+    if (nic->coloft_forwarddev) {
+        flexarray_append(back, "forwarddev");
+        flexarray_append(back, nic->coloft_forwarddev);
+    }
+
     flexarray_append(back, "mac");
     flexarray_append(back,GCSPRINTF(LIBXL_MAC_FMT, LIBXL_MAC_BYTES(nic->mac)));
     if (nic->ip) {
@@ -3500,6 +3505,7 @@ static int libxl__device_nic_from_xs_be(libxl__gc *gc,
     nic->ip = READ_BACKEND(NOGC, "ip");
     nic->bridge = READ_BACKEND(NOGC, "bridge");
     nic->script = READ_BACKEND(NOGC, "script");
+    nic->coloft_forwarddev = READ_BACKEND(NOGC, "forwarddev");
 
     /* vif_ioemu nics use the same xenstore entries as vif interfaces */
     tmp = READ_BACKEND(gc, "type");
diff --git a/tools/libxl/libxl_colo_restore.c b/tools/libxl/libxl_colo_restore.c
index c8ad796..3483f39 100644
--- a/tools/libxl/libxl_colo_restore.c
+++ b/tools/libxl/libxl_colo_restore.c
@@ -233,6 +233,11 @@ void libxl__colo_restore_setup(libxl__egc *egc,
     crcs->crs = crs;
     crs->qdisk_setuped = false;
     crs->qdisk_used = false;
+    if (dcs->colo_proxy_script)
+        crs->colo_proxy_script = libxl__strdup(gc, dcs->colo_proxy_script);
+    else
+        crs->colo_proxy_script = GCSPRINTF("%s/colo-proxy-setup",
+                                           libxl__xen_script_dir_path());
 
     /* setup dsps */
     crcs->dsps.ao = ao;
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index e2ec25c..d6028aa 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -1690,6 +1690,7 @@ static void domain_create_cb(libxl__egc *egc,
 static int do_domain_create(libxl_ctx *ctx, libxl_domain_config *d_config,
                             uint32_t *domid, int restore_fd, int send_back_fd,
                             const libxl_domain_restore_params *params,
+                            const char *colo_proxy_script,
                             const libxl_asyncop_how *ao_how,
                             const libxl_asyncprogress_how *aop_console_how)
 {
@@ -1713,6 +1714,7 @@ static int do_domain_create(libxl_ctx *ctx, libxl_domain_config *d_config,
     }
     cdcs->dcs.callback = domain_create_cb;
     cdcs->dcs.domid_soft_reset = INVALID_DOMID;
+    cdcs->dcs.colo_proxy_script = colo_proxy_script;
     libxl__ao_progress_gethow(&cdcs->dcs.aop_console_how, aop_console_how);
     cdcs->domid_out = domid;
 
@@ -1900,7 +1902,7 @@ int libxl_domain_create_new(libxl_ctx *ctx, libxl_domain_config *d_config,
                             const libxl_asyncprogress_how *aop_console_how)
 {
     unset_disk_colo_restore(d_config);
-    return do_domain_create(ctx, d_config, domid, -1, -1, NULL,
+    return do_domain_create(ctx, d_config, domid, -1, -1, NULL, NULL,
                             ao_how, aop_console_how);
 }
 
@@ -1911,14 +1913,17 @@ int libxl_domain_create_restore(libxl_ctx *ctx, libxl_domain_config *d_config,
                                 const libxl_asyncop_how *ao_how,
                                 const libxl_asyncprogress_how *aop_console_how)
 {
+    char *colo_proxy_script = NULL;
+
     if (params->checkpointed_stream == LIBXL_CHECKPOINTED_STREAM_COLO) {
+        colo_proxy_script = params->colo_proxy_script;
         set_disk_colo_restore(d_config);
     } else {
         unset_disk_colo_restore(d_config);
     }
 
     return do_domain_create(ctx, d_config, domid, restore_fd, send_back_fd,
-                            params, ao_how, aop_console_how);
+                            params, colo_proxy_script, ao_how, aop_console_how);
 }
 
 int libxl_domain_soft_reset(libxl_ctx *ctx,
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index f88fae0..165b788 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -386,6 +386,7 @@ libxl_domain_create_info = Struct("domain_create_info",[
 libxl_domain_restore_params = Struct("domain_restore_params", [
     ("checkpointed_stream", integer),
     ("stream_version", uint32, {'init_val': '1'}),
+    ("colo_proxy_script", string),
     ])
 
 libxl_domain_sched_params = Struct("domain_sched_params",[
diff --git a/tools/libxl/xl.c b/tools/libxl/xl.c
index dfae84a..a272258 100644
--- a/tools/libxl/xl.c
+++ b/tools/libxl/xl.c
@@ -45,6 +45,7 @@ char *default_bridge = NULL;
 char *default_gatewaydev = NULL;
 char *default_vifbackend = NULL;
 char *default_remus_netbufscript = NULL;
+char *default_colo_proxy_script = NULL;
 enum output_format default_output_format = OUTPUT_FORMAT_JSON;
 int claim_mode = 1;
 bool progress_use_cr = 0;
@@ -179,6 +180,8 @@ static void parse_global_config(const char *configfile,
 
     xlu_cfg_replace_string (config, "remus.default.netbufscript",
         &default_remus_netbufscript, 0);
+    xlu_cfg_replace_string (config, "colo.default.proxyscript",
+        &default_colo_proxy_script, 0);
 
     xlu_cfg_destroy(config);
 }
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 309627a..e601ca1 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -194,6 +194,7 @@ extern char *default_bridge;
 extern char *default_gatewaydev;
 extern char *default_vifbackend;
 extern char *default_remus_netbufscript;
+extern char *default_colo_proxy_script;
 extern char *blkdev_start;
 
 enum output_format {
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 25bd81a..91dcb63 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -158,6 +158,7 @@ struct domain_create {
     const char *config_file;
     char *extra_config; /* extra config string */
     const char *restore_file;
+    char *colo_proxy_script;
     int migrate_fd; /* -1 means none */
     int send_back_fd; /* -1 means none */
     char **migration_domname_r; /* from malloc */
@@ -1053,6 +1054,8 @@ static int parse_nic_config(libxl_device_nic *nic, XLU_Config **config, char *to
         replace_string(&nic->model, oparg);
     } else if (MATCH_OPTION("rate", token, oparg)) {
         parse_vif_rate(config, oparg, nic);
+    } else if (MATCH_OPTION("forwarddev", token, oparg)) {
+        replace_string(&nic->coloft_forwarddev, oparg);
     } else if (MATCH_OPTION("accel", token, oparg)) {
         fprintf(stderr, "the accel parameter for vifs is currently not supported\n");
     } else {
@@ -3001,6 +3004,7 @@ start:
         params.checkpointed_stream = dom_info->checkpointed_stream;
         params.stream_version =
             (hdr.mandatory_flags & XL_MANDATORY_FLAG_STREAMv2) ? 2 : 1;
+        params.colo_proxy_script = dom_info->colo_proxy_script;
 
         ret = libxl_domain_create_restore(ctx, &d_config,
                                           &domid, restore_fd,
@@ -4733,7 +4737,8 @@ static void migrate_domain(uint32_t domid, const char *rune, int debug,
 
 static void migrate_receive(int debug, int daemonize, int monitor,
                             int send_fd, int recv_fd,
-                            libxl_checkpointed_stream checkpointed)
+                            libxl_checkpointed_stream checkpointed,
+                            char *colo_proxy_script)
 {
     uint32_t domid;
     int rc, rc2;
@@ -4762,6 +4767,7 @@ static void migrate_receive(int debug, int daemonize, int monitor,
     dom_info.send_back_fd = send_fd;
     dom_info.migration_domname_r = &migration_domname;
     dom_info.checkpointed_stream = checkpointed;
+    dom_info.colo_proxy_script = colo_proxy_script;
 
     rc = create_domain(&dom_info);
     if (rc < 0) {
@@ -4955,8 +4961,11 @@ int main_migrate_receive(int argc, char **argv)
     int debug = 0, daemonize = 1, monitor = 1;
     libxl_checkpointed_stream checkpointed = LIBXL_CHECKPOINTED_STREAM_NONE;
     int opt;
+    char *script = NULL;
     static struct option opts[] = {
         {"colo", 0, 0, 0x100},
+        /* It is a shame that the management code for disk is not here. */
+        {"coloft-script", 1, 0, 0x200},
         COMMON_LONG_OPTS
     };
 
@@ -4977,6 +4986,9 @@ int main_migrate_receive(int argc, char **argv)
     case 0x100:
         checkpointed = LIBXL_CHECKPOINTED_STREAM_COLO;
         break;
+    case 0x200:
+        script = optarg;
+        break;
     }
 
     if (argc-optind != 0) {
@@ -4985,7 +4997,7 @@ int main_migrate_receive(int argc, char **argv)
     }
     migrate_receive(debug, daemonize, monitor,
                     STDOUT_FILENO, STDIN_FILENO,
-                    checkpointed);
+                    checkpointed, script);
 
     return 0;
 }
@@ -8395,8 +8407,10 @@ int main_remus(int argc, char **argv)
         r_info.interval = 200;
 
     if (libxl_defbool_val(r_info.colo)) {
-        if (r_info.interval || libxl_defbool_val(r_info.blackhole)) {
-            perror("Option -c conflicts with -i or -b");
+        if (r_info.interval || libxl_defbool_val(r_info.blackhole) ||
+            !libxl_defbool_is_default(r_info.netbuf) ||
+            !libxl_defbool_is_default(r_info.diskbuf)) {
+            perror("option -c is conflict with -i, -d, -n or -b");
             exit(-1);
         }
 
@@ -8407,8 +8421,12 @@ int main_remus(int argc, char **argv)
         }
     }
 
-    if (!r_info.netbufscript)
-        r_info.netbufscript = default_remus_netbufscript;
+    if (!r_info.netbufscript) {
+        if (libxl_defbool_val(r_info.colo))
+            r_info.netbufscript = default_colo_proxy_script;
+        else
+            r_info.netbufscript = default_remus_netbufscript;
+    }
 
     if (libxl_defbool_val(r_info.blackhole)) {
         send_fd = open("/dev/null", O_RDWR, 0644);
@@ -8421,10 +8439,19 @@ int main_remus(int argc, char **argv)
         if (!ssh_command[0]) {
             rune = host;
         } else {
-            xasprintf(&rune, "exec %s %s xl migrate-receive %s %s",
-                      ssh_command, host,
-                      libxl_defbool_val(r_info.colo) ? "-c" : "-r",
-                      daemonize ? "" : " -e");
+            if (!libxl_defbool_val(r_info.colo)) {
+                xasprintf(&rune, "exec %s %s xl migrate-receive %s %s",
+                          ssh_command, host,
+                          "-r",
+                          daemonize ? "" : " -e");
+            } else {
+                xasprintf(&rune, "exec %s %s xl migrate-receive %s %s %s %s",
+                          ssh_command, host,
+                          "--colo",
+                          r_info.netbufscript ? "--coloft-script" : "",
+                          r_info.netbufscript ? r_info.netbufscript : "",
+                          daemonize ? "" : " -e");
+            }
         }
 
         save_domain_core_begin(domid, NULL, &config_data, &config_len);
-- 
1.7.10.4


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