Rework ram_control_load_hook to hook during block load

We need the names of RAMBlocks as they're loaded for RDMA,
reuse a slightly modified ram_control_load_hook:
  a) Pass a 'data' parameter to use for the name in the block-reg
     case
  b) Only some hook types now require the presence of a hook function.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

3 files changed, 36 insertions, 12 deletions

diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 557c1c1a62..6bb3dc15cd 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -129,7 +129,7 @@ void ram_control_before_iterate(QEMUFile *f, uint64_t flags)
     int ret = 0;
 
     if (f->ops->before_ram_iterate) {
-        ret = f->ops->before_ram_iterate(f, f->opaque, flags);
+        ret = f->ops->before_ram_iterate(f, f->opaque, flags, NULL);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
@@ -141,24 +141,30 @@ void ram_control_after_iterate(QEMUFile *f, uint64_t flags)
     int ret = 0;
 
     if (f->ops->after_ram_iterate) {
-        ret = f->ops->after_ram_iterate(f, f->opaque, flags);
+        ret = f->ops->after_ram_iterate(f, f->opaque, flags, NULL);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
     }
 }
 
-void ram_control_load_hook(QEMUFile *f, uint64_t flags)
+void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data)
 {
     int ret = -EINVAL;
 
     if (f->ops->hook_ram_load) {
-        ret = f->ops->hook_ram_load(f, f->opaque, flags);
+        ret = f->ops->hook_ram_load(f, f->opaque, flags, data);
         if (ret < 0) {
             qemu_file_set_error(f, ret);
         }
     } else {
-        qemu_file_set_error(f, ret);
+        /*
+         * Hook is a hook specifically requested by the source sending a flag
+         * that expects there to be a hook on the destination.
+         */
+        if (flags == RAM_CONTROL_HOOK) {
+            qemu_file_set_error(f, ret);
+        }
     }
 }
 
diff --git a/migration/ram.c b/migration/ram.c
index 57368e1575..644f52ad85 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1477,6 +1477,8 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
                                 error_report_err(local_err);
                             }
                         }
+                        ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG,
+                                              block->idstr);
                         break;
                     }
                 }
@@ -1545,7 +1547,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
             break;
         default:
             if (flags & RAM_SAVE_FLAG_HOOK) {
-                ram_control_load_hook(f, flags);
+                ram_control_load_hook(f, RAM_CONTROL_HOOK, NULL);
             } else {
                 error_report("Unknown combination of migration flags: %#x",
                              flags);
diff --git a/migration/rdma.c b/migration/rdma.c
index d489012758..fab736e9ca 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2913,8 +2913,7 @@ err_rdma_dest_wait:
  *
  * Keep doing this until the source tells us to stop.
  */
-static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque,
-                                         uint64_t flags)
+static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
 {
     RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult),
                                .type = RDMA_CONTROL_REGISTER_RESULT,
@@ -2944,7 +2943,7 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque,
     CHECK_ERROR_STATE();
 
     do {
-        trace_qemu_rdma_registration_handle_wait(flags);
+        trace_qemu_rdma_registration_handle_wait();
 
         ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_NONE);
 
@@ -3132,8 +3131,25 @@ out:
     return ret;
 }
 
+static int rdma_load_hook(QEMUFile *f, void *opaque, uint64_t flags, void *data)
+{
+    switch (flags) {
+    case RAM_CONTROL_BLOCK_REG:
+        /* TODO A later patch */
+        return 0;
+        break;
+
+    case RAM_CONTROL_HOOK:
+        return qemu_rdma_registration_handle(f, opaque);
+
+    default:
+        /* Shouldn't be called with any other values */
+        abort();
+    }
+}
+
 static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
-                                        uint64_t flags)
+                                        uint64_t flags, void *data)
 {
     QEMUFileRDMA *rfile = opaque;
     RDMAContext *rdma = rfile->rdma;
@@ -3152,7 +3168,7 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque,
  * First, flush writes, if any.
  */
 static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque,
-                                       uint64_t flags)
+                                       uint64_t flags, void *data)
 {
     Error *local_err = NULL, **errp = &local_err;
     QEMUFileRDMA *rfile = opaque;
@@ -3274,7 +3290,7 @@ static const QEMUFileOps rdma_read_ops = {
     .get_buffer    = qemu_rdma_get_buffer,
     .get_fd        = qemu_rdma_get_fd,
     .close         = qemu_rdma_close,
-    .hook_ram_load = qemu_rdma_registration_handle,
+    .hook_ram_load = rdma_load_hook,
 };
 
 static const QEMUFileOps rdma_write_ops = {