Migration pull for 9.1

- Het's new test cases for "channels"
 - Het's fix for a typo for vsock parsing
 - Cedric's VFIO error report series
 - Cedric's one more patch for dirty-bitmap error reports
 - Zhijian's rdma deprecation patch
 - Yuan's zeropage optimization to fix double faults on anon mem
 - Zhijian's COLO fix on a crash
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Merge tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu into staging

Migration pull for 9.1

- Het's new test cases for "channels"
- Het's fix for a typo for vsock parsing
- Cedric's VFIO error report series
- Cedric's one more patch for dirty-bitmap error reports
- Zhijian's rdma deprecation patch
- Yuan's zeropage optimization to fix double faults on anon mem
- Zhijian's COLO fix on a crash

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# gpg: Signature made Tue 23 Apr 2024 03:37:19 PM PDT
# gpg:                using EDDSA key B9184DC20CC457DACF7DD1A93B5FCCCDF3ABD706
# gpg:                issuer "peterx@redhat.com"
# gpg: Good signature from "Peter Xu <xzpeter@gmail.com>" [unknown]
# gpg:                 aka "Peter Xu <peterx@redhat.com>" [unknown]
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# Primary key fingerprint: B918 4DC2 0CC4 57DA CF7D  D1A9 3B5F CCCD F3AB D706

* tag 'migration-20240423-pull-request' of https://gitlab.com/peterx/qemu: (26 commits)
  migration/colo: Fix bdrv_graph_rdlock_main_loop: Assertion `!qemu_in_coroutine()' failed.
  migration/multifd: solve zero page causing multiple page faults
  migration: Add Error** argument to add_bitmaps_to_list()
  migration: Modify ram_init_bitmaps() to report dirty tracking errors
  migration: Add Error** argument to xbzrle_init()
  migration: Add Error** argument to ram_state_init()
  memory: Add Error** argument to the global_dirty_log routines
  migration: Introduce ram_bitmaps_destroy()
  memory: Add Error** argument to .log_global_start() handler
  migration: Add Error** argument to .load_setup() handler
  migration: Add Error** argument to .save_setup() handler
  migration: Add Error** argument to qemu_savevm_state_setup()
  migration: Add Error** argument to vmstate_save()
  migration: Always report an error in ram_save_setup()
  migration: Always report an error in block_save_setup()
  vfio: Always report an error in vfio_save_setup()
  s390/stattrib: Add Error** argument to set_migrationmode() handler
  tests/qtest/migration: Fix typo for vsock in SocketAddress_to_str
  tests/qtest/migration: Add negative tests to validate migration QAPIs
  tests/qtest/migration: Add multifd_tcp_plain test using list of channels instead of uri
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/memory.h

@@ -1001,8 +1001,11 @@ struct MemoryListener {
      * active at that time.
      *
      * @listener: The #MemoryListener.
+     * @errp: pointer to Error*, to store an error if it happens.
+     *
+     * Return: true on success, else false setting @errp with error.
      */
-    void (*log_global_start)(MemoryListener *listener);
+    bool (*log_global_start)(MemoryListener *listener, Error **errp);
 
     /**
      * @log_global_stop:
@@ -2581,8 +2584,11 @@ void memory_listener_unregister(MemoryListener *listener);
  * memory_global_dirty_log_start: begin dirty logging for all regions
  *
  * @flags: purpose of starting dirty log, migration or dirty rate
+ * @errp: pointer to Error*, to store an error if it happens.
+ *
+ * Return: true on success, else false setting @errp with error.
  */
-void memory_global_dirty_log_start(unsigned int flags);
+bool memory_global_dirty_log_start(unsigned int flags, Error **errp);
 
 /**
  * memory_global_dirty_log_stop: end dirty logging for all regions

include/exec/ramblock.h

@@ -58,7 +58,7 @@ struct RAMBlock {
     off_t bitmap_offset;
     uint64_t pages_offset;
 
-    /* bitmap of already received pages in postcopy */
+    /* Bitmap of already received pages.  Only used on destination side. */
     unsigned long *receivedmap;
 
     /*

include/hw/s390x/storage-attributes.h

@@ -39,7 +39,7 @@ struct S390StAttribClass {
     int (*set_stattr)(S390StAttribState *sa, uint64_t start_gfn,
                       uint32_t count, uint8_t *values);
     void (*synchronize)(S390StAttribState *sa);
-    int (*set_migrationmode)(S390StAttribState *sa, bool value);
+    int (*set_migrationmode)(S390StAttribState *sa, bool value, Error **errp);
     int (*get_active)(S390StAttribState *sa);
     long long (*get_dirtycount)(S390StAttribState *sa);
 };

include/migration/register.h

@@ -60,10 +60,11 @@ typedef struct SaveVMHandlers {
      *
      * @f: QEMUFile where to send the data
      * @opaque: data pointer passed to register_savevm_live()
+     * @errp: pointer to Error*, to store an error if it happens.
      *
      * Returns zero to indicate success and negative for error
      */
-    int (*save_setup)(QEMUFile *f, void *opaque);
+    int (*save_setup)(QEMUFile *f, void *opaque, Error **errp);
 
     /**
      * @save_cleanup
@@ -233,10 +234,11 @@ typedef struct SaveVMHandlers {
      *
      * @f: QEMUFile where to receive the data
      * @opaque: data pointer passed to register_savevm_live()
+     * @errp: pointer to Error*, to store an error if it happens.
      *
      * Returns zero to indicate success and negative for error
      */
-    int (*load_setup)(QEMUFile *f, void *opaque);
+    int (*load_setup)(QEMUFile *f, void *opaque, Error **errp);
 
     /**
      * @load_cleanup