[PULL 16/21] migration/rdma: Unfold hook_ram_load()

[Juan Quintela <quintela@redhat.com>]

There is only one flag called with: RAM_CONTROL_BLOCK_REG.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20230509120700.78359-6-quintela@redhat.com>
---
 migration/qemu-file.h | 11 -----------
 migration/rdma.h      |  3 +++
 migration/qemu-file.c | 10 ----------
 migration/ram.c       |  6 ++++--
 migration/rdma.c      | 29 +++++++++--------------------
 5 files changed, 16 insertions(+), 43 deletions(-)

diff --git a/migration/qemu-file.h b/migration/qemu-file.h
index 7cfc20825e..6791db6b08 100644
--- a/migration/qemu-file.h
+++ b/migration/qemu-file.h
@@ -29,20 +29,12 @@
 #include "exec/cpu-common.h"
 #include "io/channel.h"
 
-/*
- * This function provides hooks around different
- * stages of RAM migration.
- * 'data' is call specific data associated with the 'flags' value
- */
-typedef int (QEMURamHookFunc)(QEMUFile *f, uint64_t flags, void *data);
-
 /*
  * Constants used by ram_control_* hooks
  */
 #define RAM_CONTROL_SETUP     0
 #define RAM_CONTROL_ROUND     1
 #define RAM_CONTROL_FINISH    3
-#define RAM_CONTROL_BLOCK_REG 4
 
 /*
  * This function allows override of where the RAM page
@@ -54,7 +46,6 @@ typedef int (QEMURamSaveFunc)(QEMUFile *f,
                               size_t size);
 
 typedef struct QEMUFileHooks {
-    QEMURamHookFunc *hook_ram_load;
     QEMURamSaveFunc *save_page;
 } QEMUFileHooks;
 
@@ -128,8 +119,6 @@ void qemu_fflush(QEMUFile *f);
 void qemu_file_set_blocking(QEMUFile *f, bool block);
 int qemu_file_get_to_fd(QEMUFile *f, int fd, size_t size);
 
-void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data);
-
 /* Whenever this is found in the data stream, the flags
  * will be passed to ram_control_load_hook in the incoming-migration
  * side. This lets before_ram_iterate/after_ram_iterate add
diff --git a/migration/rdma.h b/migration/rdma.h
index 8bd277efb9..8df8b4089a 100644
--- a/migration/rdma.h
+++ b/migration/rdma.h
@@ -27,6 +27,7 @@ void rdma_start_incoming_migration(const char *host_port, Error **errp);
 int qemu_rdma_registration_handle(QEMUFile *f);
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags);
 int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags);
+int rdma_block_notification_handle(QEMUFile *f, const char *name);
 #else
 static inline
 int qemu_rdma_registration_handle(QEMUFile *f) { return 0; }
@@ -34,5 +35,7 @@ static inline
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags) { return 0; }
 static inline
 int qemu_rdma_registration_stop(QEMUFile *f, uint64_t flags) { return 0; }
+static inline
+int rdma_block_notification_handle(QEMUFile *f, const char *name) { return 0; }
 #endif
 #endif
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index 918df83035..08bbc29e64 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -303,16 +303,6 @@ void qemu_fflush(QEMUFile *f)
     f->iovcnt = 0;
 }
 
-void ram_control_load_hook(QEMUFile *f, uint64_t flags, void *data)
-{
-    if (f->hooks && f->hooks->hook_ram_load) {
-        int ret = f->hooks->hook_ram_load(f, flags, data);
-        if (ret < 0) {
-            qemu_file_set_error(f, ret);
-        }
-    }
-}
-
 int ram_control_save_page(QEMUFile *f, ram_addr_t block_offset,
                           ram_addr_t offset, size_t size)
 {
diff --git a/migration/ram.c b/migration/ram.c
index 6f0597814c..67d0f20368 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3975,8 +3975,10 @@ static int ram_load_precopy(QEMUFile *f)
                             ret = -EINVAL;
                         }
                     }
-                    ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG,
-                                          block->idstr);
+                    ret = rdma_block_notification_handle(f, block->idstr);
+                    if (ret < 0) {
+                        qemu_file_set_error(f, ret);
+                    }
                 } else {
                     error_report("Unknown ramblock \"%s\", cannot "
                                  "accept migration", id);
diff --git a/migration/rdma.c b/migration/rdma.c
index a477985c6d..948e93256d 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -3811,20 +3811,22 @@ out:
 }
 
 /* Destination:
- * Called via a ram_control_load_hook during the initial RAM load section which
- * lists the RAMBlocks by name.  This lets us know the order of the RAMBlocks
- * on the source.
- * We've already built our local RAMBlock list, but not yet sent the list to
- * the source.
+ * Called during the initial RAM load section which lists the
+ * RAMBlocks by name.  This lets us know the order of the RAMBlocks on
+ * the source.  We've already built our local RAMBlock list, but not
+ * yet sent the list to the source.
  */
-static int
-rdma_block_notification_handle(QEMUFile *f, const char *name)
+int rdma_block_notification_handle(QEMUFile *f, const char *name)
 {
     RDMAContext *rdma;
     QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
     int curr;
     int found = -1;
 
+    if (!migrate_rdma()) {
+        return 0;
+    }
+
     RCU_READ_LOCK_GUARD();
     rdma = qatomic_rcu_read(&rioc->rdmain);
 
@@ -3852,18 +3854,6 @@ rdma_block_notification_handle(QEMUFile *f, const char *name)
     return 0;
 }
 
-static int rdma_load_hook(QEMUFile *f, uint64_t flags, void *data)
-{
-    switch (flags) {
-    case RAM_CONTROL_BLOCK_REG:
-        return rdma_block_notification_handle(f, data);
-
-    default:
-        /* Shouldn't be called with any other values */
-        abort();
-    }
-}
-
 int qemu_rdma_registration_start(QEMUFile *f, uint64_t flags)
 {
     QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(qemu_file_get_ioc(f));
@@ -4002,7 +3992,6 @@ err:
 }
 
 static const QEMUFileHooks rdma_read_hooks = {
-    .hook_ram_load = rdma_load_hook,
 };
 
 static const QEMUFileHooks rdma_write_hooks = {
-- 
2.40.1