Merge tag 'migration-20231004-pull-request' of https://gitlab.com/juan.quintela/qemu into staging

Migration Pull request (20231004)

Hi

In this series:

* make sure migration-tests get 0's (daniil)
  Notice that this creates a checkpatch negative, everything on that
  file is volatile, no need to add a comment.

* RDMA fix from li
* MAINTAINERS
  Get peter and fabiano to become co-maintainers of migration
  Get Entry fro migration-rdma for Li Zhijian
* Create field_exists() (peterx)
* Improve error messages (Tejus)

Please apply.

s

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# gpg: Signature made Wed 04 Oct 2023 08:40:28 EDT
# gpg:                using RSA key 1899FF8EDEBF58CCEE034B82F487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>" [full]
# gpg:                 aka "Juan Quintela <quintela@trasno.org>" [full]
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* tag 'migration-20231004-pull-request' of https://gitlab.com/juan.quintela/qemu:
  migration: Unify and trace vmstate field_exists() checks
  migration: file URI offset
  migration: file URI
  s390x/a-b-bios: zero the first byte of each page on start
  i386/a-b-bootblock: zero the first byte of each page on start
  i386/a-b-bootblock: factor test memory addresses out into constants
  migration/rdma: zore out head.repeat to make the error more clear
  migration: Add co-maintainers for migration
  MAINTAINERS: Add entry for rdma migration
  migration: Update error description outside migration.c
  migration/vmstate: Introduce vmstate_save_state_with_err

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

15 files changed, 437 insertions, 210 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 81625f0..79db298 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3207,7 +3207,8 @@ F: scripts/checkpatch.pl
 
 Migration
 M: Juan Quintela <quintela@redhat.com>
-R: Peter Xu <peterx@redhat.com>
+M: Peter Xu <peterx@redhat.com>
+M: Fabiano Rosas <farosas@suse.de>
 R: Leonardo Bras <leobras@redhat.com>
 S: Maintained
 F: hw/core/vmstate-if.c
@@ -3222,6 +3223,15 @@ F: docs/devel/migration.rst
 F: qapi/migration.json
 F: tests/migration/
 F: util/userfaultfd.c
+X: migration/rdma*
+
+RDMA Migration
+M: Juan Quintela <quintela@redhat.com>
+R: Li Zhijian <lizhijian@fujitsu.com>
+R: Peter Xu <peterx@redhat.com>
+R: Leonardo Bras <leobras@redhat.com>
+S: Odd Fixes
+F: migration/rdma*
 
 Migration dirty limit and dirty page rate
 M: Hyman Huang <yong.huang@smartx.com>
diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index e4db910..1a31fb7 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -1196,9 +1196,11 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, int version_id);
 int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, JSONWriter *vmdesc);
+int vmstate_save_state_with_err(QEMUFile *f, const VMStateDescription *vmsd,
+                       void *opaque, JSONWriter *vmdesc, Error **errp);
 int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
                          void *opaque, JSONWriter *vmdesc,
-                         int version_id);
+                         int version_id, Error **errp);
 
 bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
 
diff --git a/migration/file.c b/migration/file.c
new file mode 100644
index 0000000..cf5b1bf
--- /dev/null
+++ b/migration/file.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2021-2023 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "qapi/error.h"
+#include "channel.h"
+#include "file.h"
+#include "migration.h"
+#include "io/channel-file.h"
+#include "io/channel-util.h"
+#include "trace.h"
+
+#define OFFSET_OPTION ",offset="
+
+/* Remove the offset option from @filespec and return it in @offsetp. */
+
+static int file_parse_offset(char *filespec, uint64_t *offsetp, Error **errp)
+{
+    char *option = strstr(filespec, OFFSET_OPTION);
+    int ret;
+
+    if (option) {
+        *option = 0;
+        option += sizeof(OFFSET_OPTION) - 1;
+        ret = qemu_strtosz(option, NULL, offsetp);
+        if (ret) {
+            error_setg_errno(errp, -ret, "file URI has bad offset %s", option);
+            return -1;
+        }
+    }
+    return 0;
+}
+
+void file_start_outgoing_migration(MigrationState *s, const char *filespec,
+                                   Error **errp)
+{
+    g_autofree char *filename = g_strdup(filespec);
+    g_autoptr(QIOChannelFile) fioc = NULL;
+    uint64_t offset = 0;
+    QIOChannel *ioc;
+
+    trace_migration_file_outgoing(filename);
+
+    if (file_parse_offset(filename, &offset, errp)) {
+        return;
+    }
+
+    fioc = qio_channel_file_new_path(filename, O_CREAT | O_WRONLY | O_TRUNC,
+                                     0600, errp);
+    if (!fioc) {
+        return;
+    }
+
+    ioc = QIO_CHANNEL(fioc);
+    if (offset && qio_channel_io_seek(ioc, offset, SEEK_SET, errp) < 0) {
+        return;
+    }
+    qio_channel_set_name(ioc, "migration-file-outgoing");
+    migration_channel_connect(s, ioc, NULL, NULL);
+}
+
+static gboolean file_accept_incoming_migration(QIOChannel *ioc,
+                                               GIOCondition condition,
+                                               gpointer opaque)
+{
+    migration_channel_process_incoming(ioc);
+    object_unref(OBJECT(ioc));
+    return G_SOURCE_REMOVE;
+}
+
+void file_start_incoming_migration(const char *filespec, Error **errp)
+{
+    g_autofree char *filename = g_strdup(filespec);
+    QIOChannelFile *fioc = NULL;
+    uint64_t offset = 0;
+    QIOChannel *ioc;
+
+    trace_migration_file_incoming(filename);
+
+    if (file_parse_offset(filename, &offset, errp)) {
+        return;
+    }
+
+    fioc = qio_channel_file_new_path(filename, O_RDONLY, 0, errp);
+    if (!fioc) {
+        return;
+    }
+
+    ioc = QIO_CHANNEL(fioc);
+    if (offset && qio_channel_io_seek(ioc, offset, SEEK_SET, errp) < 0) {
+        return;
+    }
+    qio_channel_set_name(QIO_CHANNEL(ioc), "migration-file-incoming");
+    qio_channel_add_watch_full(ioc, G_IO_IN,
+                               file_accept_incoming_migration,
+                               NULL, NULL,
+                               g_main_context_get_thread_default());
+}
diff --git a/migration/file.h b/migration/file.h
new file mode 100644
index 0000000..90fa484
--- /dev/null
+++ b/migration/file.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2021-2023 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_MIGRATION_FILE_H
+#define QEMU_MIGRATION_FILE_H
+void file_start_incoming_migration(const char *filename, Error **errp);
+
+void file_start_outgoing_migration(MigrationState *s, const char *filename,
+                                   Error **errp);
+#endif
diff --git a/migration/meson.build b/migration/meson.build
index 1ae2852..92b1cc4 100644
--- a/migration/meson.build
+++ b/migration/meson.build
@@ -16,6 +16,7 @@ system_ss.add(files(
   'dirtyrate.c',
   'exec.c',
   'fd.c',
+  'file.c',
   'global_state.c',
   'migration-hmp-cmds.c',
   'migration.c',
diff --git a/migration/migration.c b/migration/migration.c
index 6d3cf5d..585d3c8 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -20,6 +20,7 @@
 #include "migration/blocker.h"
 #include "exec.h"
 #include "fd.h"
+#include "file.h"
 #include "socket.h"
 #include "sysemu/runstate.h"
 #include "sysemu/sysemu.h"
@@ -449,6 +450,8 @@ static void qemu_start_incoming_migration(const char *uri, Error **errp)
         exec_start_incoming_migration(p, errp);
     } else if (strstart(uri, "fd:", &p)) {
         fd_start_incoming_migration(p, errp);
+    } else if (strstart(uri, "file:", &p)) {
+        file_start_incoming_migration(p, errp);
     } else {
         error_setg(errp, "unknown migration protocol: %s", uri);
     }
@@ -1702,6 +1705,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
         exec_start_outgoing_migration(s, p, &local_err);
     } else if (strstart(uri, "fd:", &p)) {
         fd_start_outgoing_migration(s, p, &local_err);
+    } else if (strstart(uri, "file:", &p)) {
+        file_start_outgoing_migration(s, p, &local_err);
     } else {
         error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri",
                    "a valid migration protocol");
diff --git a/migration/rdma.c b/migration/rdma.c
index 7d2726d..cd5e1af 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2831,7 +2831,7 @@ static ssize_t qio_channel_rdma_writev(QIOChannel *ioc,
         size_t remaining = iov[i].iov_len;
         uint8_t * data = (void *)iov[i].iov_base;
         while (remaining) {
-            RDMAControlHeader head;
+            RDMAControlHeader head = {};
 
             len = MIN(remaining, RDMA_SEND_INCREMENT);
             remaining -= len;
diff --git a/migration/savevm.c b/migration/savevm.c
index bb3e991..60eec7c 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -979,6 +979,8 @@ static void save_section_footer(QEMUFile *f, SaveStateEntry *se)
 static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
 {
     int ret;
+    Error *local_err = NULL;
+    MigrationState *s = migrate_get_current();
 
     if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
         return 0;
@@ -1000,8 +1002,10 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
     if (!se->vmsd) {
         vmstate_save_old_style(f, se, vmdesc);
     } else {
-        ret = vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
+        ret = vmstate_save_state_with_err(f, se->vmsd, se->opaque, vmdesc, &local_err);
         if (ret) {
+            migrate_set_error(s, local_err);
+            error_report_err(local_err);
             return ret;
         }
     }
@@ -1068,10 +1072,14 @@ void qemu_savevm_send_open_return_path(QEMUFile *f)
 int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len)
 {
     uint32_t tmp;
+    MigrationState *ms = migrate_get_current();
+    Error *local_err = NULL;
 
     if (len > MAX_VM_CMD_PACKAGED_SIZE) {
-        error_report("%s: Unreasonably large packaged state: %zu",
+        error_setg(&local_err, "%s: Unreasonably large packaged state: %zu",
                      __func__, len);
+        migrate_set_error(ms, local_err);
+        error_report_err(local_err);
         return -1;
     }
 
@@ -1499,8 +1507,11 @@ int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
          * bdrv_activate_all() on the other end won't fail. */
         ret = bdrv_inactivate_all();
         if (ret) {
-            error_report("%s: bdrv_inactivate_all() failed (%d)",
-                         __func__, ret);
+            Error *local_err = NULL;
+            error_setg(&local_err, "%s: bdrv_inactivate_all() failed (%d)",
+                       __func__, ret);
+            migrate_set_error(ms, local_err);
+            error_report_err(local_err);
             qemu_file_set_error(f, ret);
             return ret;
         }
diff --git a/migration/trace-events b/migration/trace-events
index 6348373..002abe3 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -66,6 +66,7 @@ vmstate_save_state_loop(const char *name, const char *field, int n_elems) "%s/%s
 vmstate_save_state_top(const char *idstr) "%s"
 vmstate_subsection_save_loop(const char *name, const char *sub) "%s/%s"
 vmstate_subsection_save_top(const char *idstr) "%s"
+vmstate_field_exists(const char *vmsd, const char *name, int field_version, int version, int result) "%s:%s field_version %d version %d result %d"
 
 # vmstate-types.c
 get_qtailq(const char *name, int version_id) "%s v%d"
@@ -311,6 +312,10 @@ migration_exec_incoming(const char *cmd) "cmd=%s"
 migration_fd_outgoing(int fd) "fd=%d"
 migration_fd_incoming(int fd) "fd=%d"
 
+# file.c
+migration_file_outgoing(const char *filename) "filename=%s"
+migration_file_incoming(const char *filename) "filename=%s"
+
 # socket.c
 migration_socket_incoming_accepted(void) ""
 migration_socket_outgoing_connected(const char *hostname) "hostname=%s"
diff --git a/migration/vmstate.c b/migration/vmstate.c
index 438ea77..1cf9e45 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -14,6 +14,7 @@
 #include "migration.h"
 #include "migration/vmstate.h"
 #include "savevm.h"
+#include "qapi/error.h"
 #include "qapi/qmp/json-writer.h"
 #include "qemu-file.h"
 #include "qemu/bitops.h"
@@ -25,6 +26,30 @@ static int vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
                                    void *opaque);
 
+/* Whether this field should exist for either save or load the VM? */
+static bool
+vmstate_field_exists(const VMStateDescription *vmsd, const VMStateField *field,
+                     void *opaque, int version_id)
+{
+    bool result;
+
+    if (field->field_exists) {
+        /* If there's the function checker, that's the solo truth */
+        result = field->field_exists(opaque, version_id);
+        trace_vmstate_field_exists(vmsd->name, field->name, field->version_id,
+                                   version_id, result);
+    } else {
+        /*
+         * Otherwise, we only save/load if field version is same or older.
+         * For example, when loading from an old binary with old version,
+         * we ignore new fields with newer version_ids.
+         */
+        result = field->version_id <= version_id;
+    }
+
+    return result;
+}
+
 static int vmstate_n_elems(void *opaque, const VMStateField *field)
 {
     int n_elems = 1;
@@ -104,10 +129,7 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
     }
     while (field->name) {
         trace_vmstate_load_state_field(vmsd->name, field->name);
-        if ((field->field_exists &&
-             field->field_exists(opaque, version_id)) ||
-            (!field->field_exists &&
-             field->version_id <= version_id)) {
+        if (vmstate_field_exists(vmsd, field, opaque, version_id)) {
             void *first_elem = opaque + field->offset;
             int i, n_elems = vmstate_n_elems(opaque, field);
             int size = vmstate_size(opaque, field);
@@ -315,11 +337,17 @@ bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque)
 int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, JSONWriter *vmdesc_id)
 {
-    return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_id);
+    return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_id, NULL);
+}
+
+int vmstate_save_state_with_err(QEMUFile *f, const VMStateDescription *vmsd,
+                       void *opaque, JSONWriter *vmdesc_id, Error **errp)
+{
+    return vmstate_save_state_v(f, vmsd, opaque, vmdesc_id, vmsd->version_id, errp);
 }
 
 int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
-                         void *opaque, JSONWriter *vmdesc, int version_id)
+                         void *opaque, JSONWriter *vmdesc, int version_id, Error **errp)
 {
     int ret = 0;
     const VMStateField *field = vmsd->fields;
@@ -330,7 +358,7 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
         ret = vmsd->pre_save(opaque);
         trace_vmstate_save_state_pre_save_res(vmsd->name, ret);
         if (ret) {
-            error_report("pre-save failed: %s", vmsd->name);
+            error_setg(errp, "pre-save failed: %s", vmsd->name);
             return ret;
         }
     }
@@ -342,10 +370,7 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
     }
 
     while (field->name) {
-        if ((field->field_exists &&
-             field->field_exists(opaque, version_id)) ||
-            (!field->field_exists &&
-             field->version_id <= version_id)) {
+        if (vmstate_field_exists(vmsd, field, opaque, version_id)) {
             void *first_elem = opaque + field->offset;
             int i, n_elems = vmstate_n_elems(opaque, field);
             int size = vmstate_size(opaque, field);
@@ -377,14 +402,14 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
                 } else if (field->flags & VMS_VSTRUCT) {
                     ret = vmstate_save_state_v(f, field->vmsd, curr_elem,
                                                vmdesc_loop,
-                                               field->struct_version_id);
+                                               field->struct_version_id, errp);
                 } else {
                     ret = field->info->put(f, curr_elem, size, field,
                                      vmdesc_loop);
                 }
                 if (ret) {
-                    error_report("Save of field %s/%s failed",
-                                 vmsd->name, field->name);
+                    error_setg(errp, "Save of field %s/%s failed",
+                                vmsd->name, field->name);
                     if (vmsd->post_save) {
                         vmsd->post_save(opaque);
                     }
diff --git a/qemu-options.hx b/qemu-options.hx
index 9ce8a5b..840b83d 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4706,6 +4706,7 @@ DEF("incoming", HAS_ARG, QEMU_OPTION_incoming, \
     "                prepare for incoming migration, listen on\n" \
     "                specified protocol and socket address\n" \
     "-incoming fd:fd\n" \
+    "-incoming file:filename[,offset=offset]\n" \
     "-incoming exec:cmdline\n" \
     "                accept incoming migration on given file descriptor\n" \
     "                or from given external command\n" \
@@ -4722,7 +4723,11 @@ SRST
     Prepare for incoming migration, listen on a given unix socket.
 
 ``-incoming fd:fd``
-    Accept incoming migration from a given filedescriptor.
+    Accept incoming migration from a given file descriptor.
+
+``-incoming file:filename[,offset=offset]``
+    Accept incoming migration from a given file starting at offset.
+    offset allows the common size suffixes, or a 0x prefix, but not both.
 
 ``-incoming exec:cmdline``
     Accept incoming migration as an output from specified external
diff --git a/tests/migration/i386/a-b-bootblock.S b/tests/migration/i386/a-b-bootblock.S
index 3d464c7..6bb9999 100644
--- a/tests/migration/i386/a-b-bootblock.S
+++ b/tests/migration/i386/a-b-bootblock.S
@@ -34,19 +34,31 @@ start:             # at 0x7c00 ?
         mov $16,%eax
         mov %eax,%ds
 
+# Start from 1MB
+.set TEST_MEM_START, (1024*1024)
+.set TEST_MEM_END, (100*1024*1024)
+
         mov $65,%ax
         mov $0x3f8,%dx
         outb %al,%dx
 
         # bl keeps a counter so we limit the output speed
         mov $0, %bl
+
+pre_zero:
+        mov $TEST_MEM_START,%eax
+do_zero:
+        movb $0, (%eax)
+        add $4096,%eax
+        cmp $TEST_MEM_END,%eax
+        jl do_zero
+
 mainloop:
-        # Start from 1MB
-        mov $(1024*1024),%eax
+        mov $TEST_MEM_START,%eax
 innerloop:
         incb (%eax)
         add $4096,%eax
-        cmp $(100*1024*1024),%eax
+        cmp $TEST_MEM_END,%eax
         jl innerloop
 
         inc %bl
diff --git a/tests/migration/i386/a-b-bootblock.h b/tests/migration/i386/a-b-bootblock.h
index b7b0fce..5b52391 100644
--- a/tests/migration/i386/a-b-bootblock.h
+++ b/tests/migration/i386/a-b-bootblock.h
@@ -4,18 +4,18 @@
  * the header and the assembler differences in your patch submission.
  */
 unsigned char x86_bootsect[] = {
-  0xfa, 0x0f, 0x01, 0x16, 0x78, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
+  0xfa, 0x0f, 0x01, 0x16, 0x8c, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
   0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
   0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
   0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
-  0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
-  0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x80, 0xe3, 0x3f, 0x75, 0xe6, 0x66, 0xb8,
-  0x42, 0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xeb, 0xdb, 0x8d, 0x76, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00,
-  0x00, 0x9a, 0xcf, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00,
-  0x27, 0x00, 0x60, 0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xc6, 0x00, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00,
+  0x40, 0x06, 0x7c, 0xf1, 0xb8, 0x00, 0x00, 0x10, 0x00, 0xfe, 0x00, 0x05,
+  0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40, 0x06, 0x7c, 0xf2, 0xfe,
+  0xc3, 0x80, 0xe3, 0x3f, 0x75, 0xe6, 0x66, 0xb8, 0x42, 0x00, 0x66, 0xba,
+  0xf8, 0x03, 0xee, 0xeb, 0xdb, 0x8d, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
+  0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x74, 0x7c,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
diff --git a/tests/migration/s390x/a-b-bios.c b/tests/migration/s390x/a-b-bios.c
index a0327cd..ff99a3e 100644
--- a/tests/migration/s390x/a-b-bios.c
+++ b/tests/migration/s390x/a-b-bios.c
@@ -27,6 +27,14 @@ void main(void)
     sclp_setup();
     sclp_print("A");
 
+    /*
+     * Make sure all of the pages have consistent contents before incrementing
+     * the first byte below.
+     */
+    for (addr = START_ADDRESS; addr < END_ADDRESS; addr += 4096) {
+        *(volatile char *)addr = 0;
+    }
+
     while (1) {
         for (addr = START_ADDRESS; addr < END_ADDRESS; addr += 4096) {
             *(volatile char *)addr += 1;  /* Change pages */
diff --git a/tests/migration/s390x/a-b-bios.h b/tests/migration/s390x/a-b-bios.h
index e722dc7..96103da 100644
--- a/tests/migration/s390x/a-b-bios.h
+++ b/tests/migration/s390x/a-b-bios.h
@@ -6,10 +6,10 @@
 unsigned char s390x_elf[] = {
   0x7f, 0x45, 0x4c, 0x46, 0x02, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x16, 0x00, 0x00, 0x00, 0x01,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x78, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x80,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xa8, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x80,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, 0x07, 0x00, 0x40,
-  0x00, 0x0c, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x04,
+  0x00, 0x0d, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x04,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x88, 0x00, 0x00, 0x00, 0x00,
@@ -21,140 +21,154 @@ unsigned char s390x_elf[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
   0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x0c,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x0c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xac,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xac, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x06,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x10, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x17, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0x10,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe8, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x98, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x17, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0xb8,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x38, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x01, 0x18, 0x48, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
   0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x07, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0x10,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0x10, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0xd0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd0,
+  0x00, 0x00, 0x07, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0xb8,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0xb8, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x01, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x20,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x64, 0x74, 0xe5, 0x51,
   0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x10, 0x64, 0x74, 0xe5, 0x52, 0x00, 0x00, 0x00, 0x04,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0x10, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x17, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0x10,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd0, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0xd0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xb8, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x17, 0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x17, 0xb8,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x38, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x01, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
   0x2f, 0x6c, 0x69, 0x62, 0x2f, 0x6c, 0x64, 0x36, 0x34, 0x2e, 0x73, 0x6f,
   0x2e, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
   0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x02, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xeb, 0xef, 0xf0, 0x70,
-  0x00, 0x24, 0xa7, 0xfb, 0xff, 0x60, 0xc0, 0xe5, 0x00, 0x00, 0x01, 0x1f,
-  0xc0, 0x20, 0x00, 0x00, 0x02, 0x64, 0xc0, 0xe5, 0x00, 0x00, 0x01, 0x35,
-  0xa5, 0x1e, 0x00, 0x10, 0xa7, 0x29, 0x63, 0x00, 0xe3, 0x30, 0x10, 0x00,
-  0x00, 0x90, 0xa7, 0x3a, 0x00, 0x01, 0x42, 0x30, 0x10, 0x00, 0xa7, 0x1b,
-  0x10, 0x00, 0xa7, 0x27, 0xff, 0xf7, 0xc0, 0x20, 0x00, 0x00, 0x02, 0x50,
-  0xa7, 0xf4, 0xff, 0xeb, 0x07, 0x07, 0x07, 0x07, 0xc0, 0xf0, 0x00, 0x00,
-  0x56, 0xc4, 0xc0, 0x20, 0x00, 0x00, 0x0a, 0xbd, 0xc0, 0x30, 0x00, 0x00,
-  0x56, 0xbe, 0xb9, 0x0b, 0x00, 0x32, 0xb9, 0x02, 0x00, 0x33, 0xa7, 0x84,
-  0x00, 0x19, 0xa7, 0x3b, 0xff, 0xff, 0xeb, 0x43, 0x00, 0x08, 0x00, 0x0c,
-  0xb9, 0x02, 0x00, 0x44, 0xb9, 0x04, 0x00, 0x12, 0xa7, 0x84, 0x00, 0x09,
-  0xd7, 0xff, 0x10, 0x00, 0x10, 0x00, 0x41, 0x10, 0x11, 0x00, 0xa7, 0x47,
-  0xff, 0xfb, 0xc0, 0x20, 0x00, 0x00, 0x00, 0x07, 0x44, 0x30, 0x20, 0x00,
-  0xa7, 0xf4, 0xff, 0xb6, 0xd7, 0x00, 0x10, 0x00, 0x10, 0x00, 0xc0, 0x10,
-  0x00, 0x00, 0x00, 0x29, 0xb2, 0xb2, 0x10, 0x00, 0xeb, 0x00, 0xf0, 0x00,
-  0x00, 0x25, 0x96, 0x02, 0xf0, 0x06, 0xeb, 0x00, 0xf0, 0x00, 0x00, 0x2f,
-  0xc0, 0x10, 0x00, 0x00, 0x00, 0x11, 0xe3, 0x10, 0x01, 0xb8, 0x00, 0x24,
-  0xc0, 0x10, 0x00, 0x00, 0x00, 0x26, 0xd2, 0x07, 0x01, 0xb0, 0x10, 0x00,
-  0xc0, 0x10, 0x00, 0x00, 0x00, 0x18, 0xb2, 0xb2, 0x10, 0x00, 0xeb, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x02, 0x48, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x03, 0xa8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf0, 0xeb, 0xef, 0xf0, 0x70,
+  0x00, 0x24, 0xa7, 0xfb, 0xff, 0x60, 0xc0, 0xe5, 0x00, 0x00, 0x01, 0x5f,
+  0xc0, 0x20, 0x00, 0x00, 0x02, 0xa8, 0xc0, 0xe5, 0x00, 0x00, 0x01, 0x75,
+  0xa5, 0x2e, 0x00, 0x10, 0xa7, 0x19, 0x63, 0x00, 0x92, 0x00, 0x20, 0x00,
+  0xa7, 0x2b, 0x10, 0x00, 0xa7, 0x17, 0xff, 0xfc, 0xa5, 0x1e, 0x00, 0x10,
+  0xa7, 0x29, 0x63, 0x00, 0xe3, 0x30, 0x10, 0x00, 0x00, 0x90, 0xa7, 0x3a,
+  0x00, 0x01, 0x42, 0x30, 0x10, 0x00, 0xa7, 0x1b, 0x10, 0x00, 0xa7, 0x27,
+  0xff, 0xf7, 0xc0, 0x20, 0x00, 0x00, 0x02, 0x8a, 0xc0, 0xe5, 0x00, 0x00,
+  0x01, 0x56, 0xa7, 0xf4, 0xff, 0xeb, 0x07, 0x07, 0xc0, 0xf0, 0x00, 0x00,
+  0x4e, 0x5c, 0xc0, 0x20, 0x00, 0x00, 0x00, 0x7d, 0xe3, 0x20, 0x20, 0x00,
+  0x00, 0x04, 0xc0, 0x30, 0x00, 0x00, 0x96, 0xa3, 0xb9, 0x0b, 0x00, 0x32,
+  0xb9, 0x02, 0x00, 0x33, 0xa7, 0x84, 0x00, 0x19, 0xa7, 0x3b, 0xff, 0xff,
+  0xeb, 0x43, 0x00, 0x08, 0x00, 0x0c, 0xb9, 0x02, 0x00, 0x44, 0xb9, 0x04,
+  0x00, 0x12, 0xa7, 0x84, 0x00, 0x09, 0xd7, 0xff, 0x10, 0x00, 0x10, 0x00,
+  0x41, 0x10, 0x11, 0x00, 0xa7, 0x47, 0xff, 0xfb, 0xc0, 0x20, 0x00, 0x00,
+  0x00, 0x0d, 0x44, 0x30, 0x20, 0x00, 0xc0, 0x20, 0x00, 0x00, 0x00, 0x5b,
+  0xd2, 0x0f, 0x01, 0xd0, 0x20, 0x00, 0xa7, 0xf4, 0xff, 0xa1, 0xd7, 0x00,
+  0x10, 0x00, 0x10, 0x00, 0xc0, 0x10, 0x00, 0x00, 0x00, 0x50, 0xb2, 0xb2,
+  0x10, 0x00, 0xa7, 0xf4, 0x00, 0x00, 0xeb, 0x00, 0xf0, 0x00, 0x00, 0x25,
+  0x96, 0x02, 0xf0, 0x06, 0xeb, 0x00, 0xf0, 0x00, 0x00, 0x2f, 0xc0, 0x10,
+  0x00, 0x00, 0x00, 0x2a, 0xe3, 0x10, 0x01, 0xb8, 0x00, 0x24, 0xc0, 0x10,
+  0x00, 0x00, 0x00, 0x4b, 0xd2, 0x07, 0x01, 0xb0, 0x10, 0x00, 0xc0, 0x10,
+  0x00, 0x00, 0x00, 0x3d, 0xb2, 0xb2, 0x10, 0x00, 0xeb, 0x66, 0xf0, 0x00,
+  0x00, 0x25, 0x96, 0xff, 0xf0, 0x04, 0xeb, 0x66, 0xf0, 0x00, 0x00, 0x2f,
+  0xc0, 0x10, 0x00, 0x00, 0x00, 0x1a, 0xe3, 0x10, 0x01, 0xf8, 0x00, 0x24,
+  0xc0, 0x10, 0x00, 0x00, 0x00, 0x36, 0xd2, 0x07, 0x01, 0xf0, 0x10, 0x00,
+  0xc0, 0x10, 0x00, 0x00, 0x00, 0x24, 0xb2, 0xb2, 0x10, 0x00, 0xeb, 0x00,
   0xf0, 0x00, 0x00, 0x25, 0x94, 0xfd, 0xf0, 0x06, 0xeb, 0x00, 0xf0, 0x00,
-  0x00, 0x2f, 0x07, 0xfe, 0x07, 0x07, 0x07, 0x07, 0x00, 0x02, 0x00, 0x01,
+  0x00, 0x2f, 0x07, 0xfe, 0xeb, 0x66, 0xf0, 0x00, 0x00, 0x25, 0x94, 0x00,
+  0xf0, 0x04, 0xeb, 0x66, 0xf0, 0x00, 0x00, 0x2f, 0x07, 0xfe, 0x07, 0x07,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf0, 0x00, 0x02, 0x00, 0x01,
   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x03, 0x02, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00,
-  0xeb, 0xbf, 0xf0, 0x58, 0x00, 0x24, 0xc0, 0x10, 0x00, 0x00, 0x0e, 0x59,
-  0xa7, 0xfb, 0xff, 0x60, 0xb2, 0x20, 0x00, 0x21, 0xb2, 0x22, 0x00, 0xb0,
-  0x88, 0xb0, 0x00, 0x1c, 0xc0, 0xe5, 0xff, 0xff, 0xff, 0xba, 0xa7, 0xbe,
-  0x00, 0x03, 0xa7, 0x84, 0x00, 0x13, 0xa7, 0xbe, 0x00, 0x02, 0xa7, 0x28,
-  0x00, 0x00, 0xa7, 0x74, 0x00, 0x04, 0xa7, 0x28, 0xff, 0xfe, 0xe3, 0x40,
-  0xf1, 0x10, 0x00, 0x04, 0xb9, 0x14, 0x00, 0x22, 0xeb, 0xbf, 0xf0, 0xf8,
-  0x00, 0x04, 0x07, 0xf4, 0xa7, 0x28, 0xff, 0xff, 0xa7, 0xf4, 0xff, 0xf5,
-  0x07, 0x07, 0x07, 0x07, 0xeb, 0xbf, 0xf0, 0x58, 0x00, 0x24, 0xc0, 0xd0,
-  0x00, 0x00, 0x01, 0x21, 0xa7, 0xfb, 0xff, 0x60, 0xa7, 0xb9, 0x00, 0x00,
-  0xa7, 0x19, 0x00, 0x00, 0xc0, 0x40, 0x00, 0x00, 0x0e, 0x24, 0xa7, 0x3b,
-  0x00, 0x01, 0xa7, 0x37, 0x00, 0x23, 0xc0, 0x20, 0x00, 0x00, 0x0e, 0x1d,
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   0x00, 0x00, 0x02, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06,
@@ -163,91 +177,103 @@ unsigned char s390x_elf[] = {
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+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2b, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
-  0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x09, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x61,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x24, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x57, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00
+  0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 };