[Xen-devel] [PATCH v3 COLOPre 15/26] tools/libxl: Add back channel to allow migration target send data back

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

From: Wen Congyang <wency@xxxxxxxxxxxxxx>

In colo mode, slave needs to send data to master, but the io_fd
only can be written in master, and only can be read in slave.
Save recv_fd in domain_suspend_state, and send_fd in
domain_create_state.
Extend libxl_domain_create_restore API, add a send_fd param to
it.
Add LIBXL_HAVE_CREATE_RESTORE_SEND_FD to indicate the API change.

Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
---
 tools/libxl/libxl.c          |  2 +-
 tools/libxl/libxl.h          | 29 +++++++++++++++++++++++++++--
 tools/libxl/libxl_create.c   |  9 +++++----
 tools/libxl/libxl_internal.h |  2 ++
 tools/libxl/libxl_types.idl  |  1 +
 tools/libxl/xl_cmdimpl.c     |  8 +++++++-
 6 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 59e2dfe..a837ff2 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -832,7 +832,7 @@ int libxl_domain_remus_start(libxl_ctx *ctx, 
libxl_domain_remus_info *info,
     dss->callback = remus_failover_cb;
     dss->domid = domid;
     dss->fd = send_fd;
-    /* TODO do something with recv_fd */
+    dss->recv_fd = recv_fd;
     dss->type = type;
     dss->live = 1;
     dss->debug = 0;
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 0a7913b..cd595cf 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -604,6 +604,14 @@ typedef struct libxl__ctx libxl_ctx;
 #define LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS 1
 
 /*
+ * LIBXL_HAVE_DOMAIN_CREATE_RESTORE_SEND_FD 1
+ *
+ * If this is defined, libxl_domain_create_restore()'s API has changed to
+ * include a send_fd param which used for libxl migration back channel.
+ */
+#define LIBXL_HAVE_DOMAIN_CREATE_RESTORE_SEND_FD 1
+
+/*
  * LIBXL_HAVE_CREATEINFO_PVH
  * If this is defined, then libxl supports creation of a PVH guest.
  */
@@ -981,7 +989,7 @@ int libxl_domain_create_new(libxl_ctx *ctx, 
libxl_domain_config *d_config,
                             const libxl_asyncprogress_how *aop_console_how)
                             LIBXL_EXTERNAL_CALLERS_ONLY;
 int libxl_domain_create_restore(libxl_ctx *ctx, libxl_domain_config *d_config,
-                                uint32_t *domid, int restore_fd,
+                                uint32_t *domid, int restore_fd, int send_fd,
                                 const libxl_domain_restore_params *params,
                                 const libxl_asyncop_how *ao_how,
                                 const libxl_asyncprogress_how *aop_console_how)
@@ -1002,7 +1010,7 @@ int static inline libxl_domain_create_restore_0x040200(
     libxl_domain_restore_params_init(&params);
 
     ret = libxl_domain_create_restore(
-        ctx, d_config, domid, restore_fd, &params, ao_how, aop_console_how);
+        ctx, d_config, domid, restore_fd, -1, &params, ao_how, 
aop_console_how);
 
     libxl_domain_restore_params_dispose(&params);
     return ret;
@@ -1010,6 +1018,23 @@ int static inline libxl_domain_create_restore_0x040200(
 
 #define libxl_domain_create_restore libxl_domain_create_restore_0x040200
 
+#elif defined(LIBXL_API_VERSION) && LIBXL_API_VERSION >= 0x040400 \
+                                 && LIBXL_API_VERSION < 0x040600
+
+int static inline libxl_domain_create_restore_0x040400(
+    libxl_ctx *ctx, libxl_domain_config *d_config,
+    uint32_t *domid, int restore_fd,
+    const libxl_domain_restore_params *params,
+    const libxl_asyncop_how *ao_how,
+    const libxl_asyncprogress_how *aop_console_how)
+    LIBXL_EXTERNAL_CALLERS_ONLY
+{
+    return libxl_domain_create_restore(ctx, d_config, domid, restore_fd,
+                                       -1, params, ao_how, aop_console_how);
+}
+
+#define libxl_domain_create_restore libxl_domain_create_restore_0x040400
+
 #endif
 
   /* A progress report will be made via ao_console_how, of type
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index dfea992..6fa5ab7 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -1561,7 +1561,7 @@ static void domain_create_cb(libxl__egc *egc,
                              int rc, uint32_t domid);
 
 static int do_domain_create(libxl_ctx *ctx, libxl_domain_config *d_config,
-                            uint32_t *domid, int restore_fd,
+                            uint32_t *domid, int restore_fd, int send_fd,
                             const libxl_domain_restore_params *params,
                             const libxl_asyncop_how *ao_how,
                             const libxl_asyncprogress_how *aop_console_how)
@@ -1576,6 +1576,7 @@ static int do_domain_create(libxl_ctx *ctx, 
libxl_domain_config *d_config,
     libxl_domain_config_copy(ctx, &cdcs->dcs.guest_config_saved, d_config);
     cdcs->dcs.restore_fd = restore_fd;
     if (params) cdcs->dcs.restore_params = *params;
+    cdcs->dcs.send_fd = send_fd;
     cdcs->dcs.callback = domain_create_cb;
     libxl__ao_progress_gethow(&cdcs->dcs.aop_console_how, aop_console_how);
     cdcs->domid_out = domid;
@@ -1603,17 +1604,17 @@ int libxl_domain_create_new(libxl_ctx *ctx, 
libxl_domain_config *d_config,
                             const libxl_asyncop_how *ao_how,
                             const libxl_asyncprogress_how *aop_console_how)
 {
-    return do_domain_create(ctx, d_config, domid, -1, NULL,
+    return do_domain_create(ctx, d_config, domid, -1, -1, NULL,
                             ao_how, aop_console_how);
 }
 
 int libxl_domain_create_restore(libxl_ctx *ctx, libxl_domain_config *d_config,
-                                uint32_t *domid, int restore_fd,
+                                uint32_t *domid, int restore_fd, int send_fd,
                                 const libxl_domain_restore_params *params,
                                 const libxl_asyncop_how *ao_how,
                                 const libxl_asyncprogress_how *aop_console_how)
 {
-    return do_domain_create(ctx, d_config, domid, restore_fd, params,
+    return do_domain_create(ctx, d_config, domid, restore_fd, send_fd, params,
                             ao_how, aop_console_how);
 }
 
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 5f875ee..13d8271 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2948,6 +2948,7 @@ struct libxl__domain_save_state {
 
     uint32_t domid;
     int fd;
+    int recv_fd;
     libxl_domain_type type;
     int live;
     int debug;
@@ -3264,6 +3265,7 @@ struct libxl__domain_create_state {
     libxl_domain_config *guest_config;
     libxl_domain_config guest_config_saved; /* vanilla config */
     int restore_fd;
+    int send_fd;
     libxl_domain_restore_params restore_params;
     libxl__domain_create_cb *callback;
     libxl_asyncprogress_how aop_console_how;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 7c82f33..5c7b82d 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -201,6 +201,7 @@ libxl_viridian_enlightenment = 
Enumeration("viridian_enlightenment", [
 libxl_checkpointed_stream = Enumeration("checkpointed_stream", [
     (0, "NONE"),
     (1, "REMUS"),
+    (2, "COLO"),
     ])
 
 #
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index c965ef5..83164bc 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -157,6 +157,7 @@ struct domain_create {
     const char *extra_config; /* extra config string */
     const char *restore_file;
     int migrate_fd; /* -1 means none */
+    int send_fd; /* -1 means none */
     char **migration_domname_r; /* from malloc */
 };
 
@@ -2536,6 +2537,7 @@ static uint32_t create_domain(struct domain_create 
*dom_info)
     void *config_data = 0;
     int config_len = 0;
     int restore_fd = -1;
+    int send_fd = -1;
     const libxl_asyncprogress_how *autoconnect_console_how;
     struct save_file_header hdr;
 
@@ -2552,6 +2554,7 @@ static uint32_t create_domain(struct domain_create 
*dom_info)
         if (migrate_fd >= 0) {
             restore_source = "<incoming migration stream>";
             restore_fd = migrate_fd;
+            send_fd = dom_info->send_fd;
         } else {
             restore_source = restore_file;
             restore_fd = open(restore_file, O_RDONLY);
@@ -2731,7 +2734,7 @@ start:
 
         ret = libxl_domain_create_restore(ctx, &d_config,
                                           &domid, restore_fd,
-                                          &params,
+                                          send_fd, &params,
                                           0, autoconnect_console_how);
 
         libxl_domain_restore_params_dispose(&params);
@@ -4273,6 +4276,7 @@ static void migrate_receive(int debug, int daemonize, int 
monitor,
     dom_info.monitor = monitor;
     dom_info.paused = 1;
     dom_info.migrate_fd = recv_fd;
+    dom_info.send_fd = send_fd;
     dom_info.migration_domname_r = &migration_domname;
     dom_info.checkpointed_stream = checkpointed;
 
@@ -4443,6 +4447,7 @@ int main_restore(int argc, char **argv)
     dom_info.config_file = config_file;
     dom_info.restore_file = checkpoint_file;
     dom_info.migrate_fd = -1;
+    dom_info.send_fd = -1;
     dom_info.vnc = vnc;
     dom_info.vncautopass = vncautopass;
     dom_info.console_autoconnect = console_autoconnect;
@@ -4894,6 +4899,7 @@ int main_create(int argc, char **argv)
     dom_info.config_file = filename;
     dom_info.extra_config = extra_config;
     dom_info.migrate_fd = -1;
+    dom_info.send_fd = -1;
     dom_info.vnc = vnc;
     dom_info.vncautopass = vncautopass;
     dom_info.console_autoconnect = console_autoconnect;
-- 
1.9.1


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