[PATCH 11/33] migration: push Error **errp into ram_postcopy_incoming_init()

["Daniel P. Berrangé" <berrange@redhat.com>]

This is an incremental step in converting vmstate loading code to report
via Error objects instead of printing directly to the console/monitor.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 migration/postcopy-ram.c | 8 ++++++--
 migration/postcopy-ram.h | 2 +-
 migration/ram.c          | 6 +++---
 migration/ram.h          | 2 +-
 migration/savevm.c       | 3 +--
 5 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index ab482adef1..54b748757a 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -446,6 +446,7 @@ out:
  */
 static int init_range(RAMBlock *rb, void *opaque)
 {
+    Error **errp = opaque;
     const char *block_name = qemu_ram_get_idstr(rb);
     void *host_addr = qemu_ram_get_host_addr(rb);
     ram_addr_t offset = qemu_ram_get_offset(rb);
@@ -459,6 +460,8 @@ static int init_range(RAMBlock *rb, void *opaque)
      * (Precopy will just overwrite this data, so doesn't need the discard)
      */
     if (ram_discard_range(block_name, 0, length)) {
+        error_setg(errp, "failed to discard RAM block %s len=%zu",
+                   block_name, length);
         return -1;
     }
 
@@ -507,9 +510,10 @@ static int cleanup_range(RAMBlock *rb, void *opaque)
  * postcopy later; must be called prior to any precopy.
  * called from arch_init's similarly named ram_postcopy_incoming_init
  */
-int postcopy_ram_incoming_init(MigrationIncomingState *mis)
+int postcopy_ram_incoming_init(MigrationIncomingState *mis,
+                               Error **errp)
 {
-    if (foreach_not_ignored_block(init_range, NULL)) {
+    if (foreach_not_ignored_block(init_range, errp)) {
         return -1;
     }
 
diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h
index 6d2b3cf124..7458ac1199 100644
--- a/migration/postcopy-ram.h
+++ b/migration/postcopy-ram.h
@@ -27,7 +27,7 @@ int postcopy_ram_incoming_setup(MigrationIncomingState *mis);
  * postcopy later; must be called prior to any precopy.
  * called from ram.c's similarly named ram_postcopy_incoming_init
  */
-int postcopy_ram_incoming_init(MigrationIncomingState *mis);
+int postcopy_ram_incoming_init(MigrationIncomingState *mis, Error **errp);
 
 /*
  * At the end of a migration where postcopy_ram_incoming_init was called.
diff --git a/migration/ram.c b/migration/ram.c
index 7811cde643..f6180e8f4f 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -3156,7 +3156,7 @@ static int ram_load_cleanup(void *opaque)
 /**
  * ram_postcopy_incoming_init: allocate postcopy data structures
  *
- * Returns 0 for success and negative if there was one error
+ * Returns 0 for success and -1 if there was one error
  *
  * @mis: current migration incoming state
  *
@@ -3164,9 +3164,9 @@ static int ram_load_cleanup(void *opaque)
  * postcopy-ram. postcopy-ram's similarly names
  * postcopy_ram_incoming_init does the work.
  */
-int ram_postcopy_incoming_init(MigrationIncomingState *mis)
+int ram_postcopy_incoming_init(MigrationIncomingState *mis, Error **errp)
 {
-    return postcopy_ram_incoming_init(mis);
+    return postcopy_ram_incoming_init(mis, errp);
 }
 
 /**
diff --git a/migration/ram.h b/migration/ram.h
index 011e85414e..1cea36ba51 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -61,7 +61,7 @@ void ram_postcopy_migrated_memory_release(MigrationState *ms);
 int ram_postcopy_send_discard_bitmap(MigrationState *ms);
 /* For incoming postcopy discard */
 int ram_discard_range(const char *block_name, uint64_t start, size_t length);
-int ram_postcopy_incoming_init(MigrationIncomingState *mis);
+int ram_postcopy_incoming_init(MigrationIncomingState *mis, Error **errp);
 
 void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
 
diff --git a/migration/savevm.c b/migration/savevm.c
index b0eb250d1c..c505526406 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1722,8 +1722,7 @@ static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
         return -1;
     }
 
-    if (ram_postcopy_incoming_init(mis)) {
-        error_setg(errp, "Postcopy RAM incoming init failed");
+    if (ram_postcopy_incoming_init(mis, errp)) {
         return -1;
     }
 
-- 
2.29.2