Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20181011a' into staging

Migration pull 2018-10-11

With one bonus HMP fix.

# gpg: Signature made Thu 11 Oct 2018 20:23:12 BST
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20181011a:
  migration-test: Only generate a single target architecture
  qmp, hmp: make subsystem/system-vendor identities optional
  vhost-user: Don't ask for reply on postcopy mem table set
  vhost-user: Fix userfaultfd leak
  migration: Stop postcopy fault thread before notifying
  tests/migration: Enable the migration test on s390x, too
  tests: Add migration test for aarch64

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

15 files changed, 531 insertions, 38 deletions

diff --git a/hmp.c b/hmp.c
index 61ef120423..7828f93a39 100644
--- a/hmp.c
+++ b/hmp.c
@@ -837,8 +837,10 @@ static void hmp_info_pci_device(Monitor *mon, const PciDeviceInfo *dev)
 
     monitor_printf(mon, ": PCI device %04" PRIx64 ":%04" PRIx64 "\n",
                    dev->id->vendor, dev->id->device);
-    monitor_printf(mon, "      PCI subsystem %04" PRIx64 ":%04" PRIx64 "\n",
-                   dev->id->subsystem_vendor, dev->id->subsystem);
+    if (dev->id->has_subsystem_vendor && dev->id->has_subsystem) {
+        monitor_printf(mon, "      PCI subsystem %04" PRIx64 ":%04" PRIx64 "\n",
+                       dev->id->subsystem_vendor, dev->id->subsystem);
+    }
 
     if (dev->has_irq) {
         monitor_printf(mon, "      IRQ %" PRId64 ".\n", dev->irq);
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 51d0dec466..b937f0dc0a 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1737,9 +1737,6 @@ static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
     info->id = g_new0(PciDeviceId, 1);
     info->id->vendor = pci_get_word(dev->config + PCI_VENDOR_ID);
     info->id->device = pci_get_word(dev->config + PCI_DEVICE_ID);
-    info->id->subsystem = pci_get_word(dev->config + PCI_SUBSYSTEM_ID);
-    info->id->subsystem_vendor =
-        pci_get_word(dev->config + PCI_SUBSYSTEM_VENDOR_ID);
     info->regions = qmp_query_pci_regions(dev);
     info->qdev_id = g_strdup(dev->qdev.id ? dev->qdev.id : "");
 
@@ -1752,6 +1749,16 @@ static PciDeviceInfo *qmp_query_pci_device(PCIDevice *dev, PCIBus *bus,
     if (type == PCI_HEADER_TYPE_BRIDGE) {
         info->has_pci_bridge = true;
         info->pci_bridge = qmp_query_pci_bridge(dev, bus, bus_num);
+    } else if (type == PCI_HEADER_TYPE_NORMAL) {
+        info->id->has_subsystem = info->id->has_subsystem_vendor = true;
+        info->id->subsystem = pci_get_word(dev->config + PCI_SUBSYSTEM_ID);
+        info->id->subsystem_vendor =
+            pci_get_word(dev->config + PCI_SUBSYSTEM_VENDOR_ID);
+    } else if (type == PCI_HEADER_TYPE_CARDBUS) {
+        info->id->has_subsystem = info->id->has_subsystem_vendor = true;
+        info->id->subsystem = pci_get_word(dev->config + PCI_CB_SUBSYSTEM_ID);
+        info->id->subsystem_vendor =
+            pci_get_word(dev->config + PCI_CB_SUBSYSTEM_VENDOR_ID);
     }
 
     return info;
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index b041343632..e09bed0e4a 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -374,8 +374,6 @@ static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev,
     int fds[VHOST_MEMORY_MAX_NREGIONS];
     int i, fd;
     size_t fd_num = 0;
-    bool reply_supported = virtio_has_feature(dev->protocol_features,
-                                              VHOST_USER_PROTOCOL_F_REPLY_ACK);
     VhostUserMsg msg_reply;
     int region_i, msg_i;
 
@@ -384,10 +382,6 @@ static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev,
         .hdr.flags = VHOST_USER_VERSION,
     };
 
-    if (reply_supported) {
-        msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK;
-    }
-
     if (u->region_rb_len < dev->mem->nregions) {
         u->region_rb = g_renew(RAMBlock*, u->region_rb, dev->mem->nregions);
         u->region_rb_offset = g_renew(ram_addr_t, u->region_rb_offset,
@@ -503,10 +497,6 @@ static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev,
         return -1;
     }
 
-    if (reply_supported) {
-        return process_message_reply(dev, &msg);
-    }
-
     return 0;
 }
 
@@ -519,8 +509,7 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev,
     size_t fd_num = 0;
     bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler;
     bool reply_supported = virtio_has_feature(dev->protocol_features,
-                                          VHOST_USER_PROTOCOL_F_REPLY_ACK) &&
-                                          !do_postcopy;
+                                              VHOST_USER_PROTOCOL_F_REPLY_ACK);
 
     if (do_postcopy) {
         /* Postcopy has enough differences that it's best done in it's own
@@ -1291,6 +1280,7 @@ static int vhost_user_postcopy_end(struct vhost_dev *dev, Error **errp)
         return ret;
     }
     postcopy_unregister_shared_ufd(&u->postcopy_fd);
+    close(u->postcopy_fd.fd);
     u->postcopy_fd.handler = NULL;
 
     trace_vhost_user_postcopy_end_exit();
@@ -1430,6 +1420,12 @@ static int vhost_user_backend_cleanup(struct vhost_dev *dev)
         postcopy_remove_notifier(&u->postcopy_notifier);
         u->postcopy_notifier.notify = NULL;
     }
+    u->postcopy_listen = false;
+    if (u->postcopy_fd.handler) {
+        postcopy_unregister_shared_ufd(&u->postcopy_fd);
+        close(u->postcopy_fd.fd);
+        u->postcopy_fd.handler = NULL;
+    }
     if (u->slave_fd >= 0) {
         qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL);
         close(u->slave_fd);
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 853d8b32ca..e5c02a32c5 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -533,6 +533,12 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis)
     if (mis->have_fault_thread) {
         Error *local_err = NULL;
 
+        /* Let the fault thread quit */
+        atomic_set(&mis->fault_thread_quit, 1);
+        postcopy_fault_thread_notify(mis);
+        trace_postcopy_ram_incoming_cleanup_join();
+        qemu_thread_join(&mis->fault_thread);
+
         if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_END, &local_err)) {
             error_report_err(local_err);
             return -1;
@@ -541,11 +547,6 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis)
         if (qemu_ram_foreach_migratable_block(cleanup_range, mis)) {
             return -1;
         }
-        /* Let the fault thread quit */
-        atomic_set(&mis->fault_thread_quit, 1);
-        postcopy_fault_thread_notify(mis);
-        trace_postcopy_ram_incoming_cleanup_join();
-        qemu_thread_join(&mis->fault_thread);
 
         trace_postcopy_ram_incoming_cleanup_closeuf();
         close(mis->userfault_fd);
diff --git a/qapi/misc.json b/qapi/misc.json
index f98de3a58c..3a68af9ca3 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -839,8 +839,8 @@
 # Since: 2.4
 ##
 { 'struct': 'PciDeviceId',
-  'data': {'device': 'int', 'vendor': 'int', 'subsystem': 'int',
-            'subsystem-vendor': 'int'} }
+  'data': {'device': 'int', 'vendor': 'int', '*subsystem': 'int',
+            '*subsystem-vendor': 'int'} }
 
 ##
 # @PciDeviceInfo:
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 8264af64a8..5eadfd52f9 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -402,6 +402,7 @@ check-qtest-arm-y += tests/hexloader-test$(EXESUF)
 check-qtest-aarch64-y = tests/numa-test$(EXESUF)
 check-qtest-aarch64-$(CONFIG_SDHCI) += tests/sdhci-test$(EXESUF)
 check-qtest-aarch64-y += tests/boot-serial-test$(EXESUF)
+check-qtest-aarch64-y += tests/migration-test$(EXESUF)
 
 check-qtest-microblazeel-y = $(check-qtest-microblaze-y)
 
@@ -415,6 +416,7 @@ check-qtest-s390x-$(CONFIG_POSIX) += tests/test-filter-redirector$(EXESUF)
 check-qtest-s390x-y += tests/drive_del-test$(EXESUF)
 check-qtest-s390x-y += tests/virtio-ccw-test$(EXESUF)
 check-qtest-s390x-y += tests/cpu-plug-test$(EXESUF)
+check-qtest-s390x-y += tests/migration-test$(EXESUF)
 
 check-qtest-generic-y += tests/machine-none-test$(EXESUF)
 check-qtest-generic-y += tests/qom-test$(EXESUF)
diff --git a/tests/migration-test.c b/tests/migration-test.c
index 20f38f1930..b7920255c5 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -86,12 +86,24 @@ static const char *tmpfs;
  * repeatedly. It outputs a 'B' at a fixed rate while it's still running.
  */
 #include "tests/migration/i386/a-b-bootblock.h"
+#include "tests/migration/aarch64/a-b-kernel.h"
 
-static void init_bootfile_x86(const char *bootpath)
+static void init_bootfile(const char *bootpath, void *content)
 {
     FILE *bootfile = fopen(bootpath, "wb");
 
-    g_assert_cmpint(fwrite(x86_bootsect, 512, 1, bootfile), ==, 1);
+    g_assert_cmpint(fwrite(content, 512, 1, bootfile), ==, 1);
+    fclose(bootfile);
+}
+
+#include "tests/migration/s390x/a-b-bios.h"
+
+static void init_bootfile_s390x(const char *bootpath)
+{
+    FILE *bootfile = fopen(bootpath, "wb");
+    size_t len = sizeof(s390x_elf);
+
+    g_assert_cmpint(fwrite(s390x_elf, len, 1, bootfile), ==, 1);
     fclose(bootfile);
 }
 
@@ -428,7 +440,7 @@ static int test_migrate_start(QTestState **from, QTestState **to,
     got_stop = false;
 
     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
-        init_bootfile_x86(bootpath);
+        init_bootfile(bootpath, x86_bootsect);
         cmd_src = g_strdup_printf("-machine accel=%s -m 150M"
                                   " -name source,debug-threads=on"
                                   " -serial file:%s/src_serial"
@@ -442,6 +454,19 @@ static int test_migrate_start(QTestState **from, QTestState **to,
                                   accel, tmpfs, bootpath, uri);
         start_address = X86_TEST_MEM_START;
         end_address = X86_TEST_MEM_END;
+    } else if (g_str_equal(arch, "s390x")) {
+        init_bootfile_s390x(bootpath);
+        cmd_src = g_strdup_printf("-machine accel=%s -m 128M"
+                                  " -name source,debug-threads=on"
+                                  " -serial file:%s/src_serial -bios %s",
+                                  accel, tmpfs, bootpath);
+        cmd_dst = g_strdup_printf("-machine accel=%s -m 128M"
+                                  " -name target,debug-threads=on"
+                                  " -serial file:%s/dest_serial -bios %s"
+                                  " -incoming %s",
+                                  accel, tmpfs, bootpath, uri);
+        start_address = S390_TEST_MEM_START;
+        end_address = S390_TEST_MEM_END;
     } else if (strcmp(arch, "ppc64") == 0) {
         cmd_src = g_strdup_printf("-machine accel=%s -m 256M -nodefaults"
                                   " -name source,debug-threads=on"
@@ -459,6 +484,24 @@ static int test_migrate_start(QTestState **from, QTestState **to,
 
         start_address = PPC_TEST_MEM_START;
         end_address = PPC_TEST_MEM_END;
+    } else if (strcmp(arch, "aarch64") == 0) {
+        init_bootfile(bootpath, aarch64_kernel);
+        cmd_src = g_strdup_printf("-machine virt,accel=%s,gic-version=max "
+                                  "-name vmsource,debug-threads=on -cpu max "
+                                  "-m 150M -serial file:%s/src_serial "
+                                  "-kernel %s ",
+                                  accel, tmpfs, bootpath);
+        cmd_dst = g_strdup_printf("-machine virt,accel=%s,gic-version=max "
+                                  "-name vmdest,debug-threads=on -cpu max "
+                                  "-m 150M -serial file:%s/dest_serial "
+                                  "-kernel %s "
+                                  "-incoming %s ",
+                                  accel, tmpfs, bootpath, uri);
+
+        start_address = ARM_TEST_MEM_START;
+        end_address = ARM_TEST_MEM_END;
+
+        g_assert(sizeof(aarch64_kernel) <= ARM_TEST_MAX_KERNEL_SIZE);
     } else {
         g_assert_not_reached();
     }
@@ -545,7 +588,7 @@ static void test_deprecated(void)
 {
     QTestState *from;
 
-    from = qtest_start("");
+    from = qtest_start("-machine none");
 
     deprecated_set_downtime(from, 0.12345);
     deprecated_set_speed(from, 12345);
diff --git a/tests/migration/Makefile b/tests/migration/Makefile
index dc3b551976..13e99b1692 100644
--- a/tests/migration/Makefile
+++ b/tests/migration/Makefile
@@ -5,10 +5,23 @@
 # See the COPYING file in the top-level directory.
 #
 
-TARGET_LIST = i386
+TARGET_LIST = i386 aarch64 s390x
 
 SRC_PATH = ../..
 
+.PHONY: help $(TARGET_LIST)
+help:
+	@echo "Create migration guest includes.  We generate a binary."
+	@echo "And then convert that binary to an include file that can be"
+	@echo "run in a guest."
+	@echo "Possible operations are:"
+	@echo
+	@echo " $(MAKE) clean                Remove all intermediate files"
+	@echo " $(MAKE) target               Generate for that target"
+	@echo " $(MAKE) CROSS_PREFIX=... target"
+	@echo "                              Cross-compile than target"
+	@echo " Possible targets are: $(TARGET_LIST)"
+
 override define __note
 /* This file is automatically generated from the assembly file in
  * tests/migration/$@. Edit that file and then run "make all"
@@ -18,16 +31,8 @@ override define __note
 endef
 export __note
 
-find-arch-cross-cc = $(lastword $(shell grep -h "CROSS_CC_GUEST=" $(wildcard $(SRC_PATH)/$(patsubst i386,*86*,$(1))-softmmu/config-target.mak) /dev/null))
-parse-cross-prefix = $(subst gcc,,$(patsubst cc,gcc,$(patsubst CROSS_CC_GUEST="%",%,$(call find-arch-cross-cc,$(1)))))
-gen-cross-prefix = $(patsubst %-,CROSS_PREFIX=%-,$(call parse-cross-prefix,$(1)))
-
-.PHONY: all $(TARGET_LIST)
-
-all: $(TARGET_LIST)
-
 $(TARGET_LIST):
-	$(MAKE) -C $@ $(call gen-cross-prefix,$@)
+	$(MAKE) CROSS_PREFIX=$(CROSS_PREFIX) -C $@
 
 clean:
 	for target in $(TARGET_LIST); do \
diff --git a/tests/migration/aarch64/Makefile b/tests/migration/aarch64/Makefile
new file mode 100644
index 0000000000..9c4fa18e76
--- /dev/null
+++ b/tests/migration/aarch64/Makefile
@@ -0,0 +1,18 @@
+# To specify cross compiler prefix, use CROSS_PREFIX=
+#   $ make CROSS_PREFIX=aarch64-linux-gnu-
+
+.PHONY: all clean
+all: a-b-kernel.h
+
+a-b-kernel.h: aarch64.kernel
+	echo "$$__note" > $@
+	xxd -i $< | sed -e 's/.*int.*//' >> $@
+
+aarch64.kernel: aarch64.elf
+	$(CROSS_PREFIX)objcopy -O binary $< $@
+
+aarch64.elf: a-b-kernel.S
+	$(CROSS_PREFIX)gcc -o $@ -nostdlib -Wl,--build-id=none $<
+
+clean:
+	$(RM) *.kernel *.elf
diff --git a/tests/migration/aarch64/a-b-kernel.S b/tests/migration/aarch64/a-b-kernel.S
new file mode 100644
index 0000000000..0225945348
--- /dev/null
+++ b/tests/migration/aarch64/a-b-kernel.S
@@ -0,0 +1,75 @@
+#
+# Copyright (c) 2018 Red Hat, Inc. and/or its affiliates
+#
+# Author:
+#   Wei Huang <wei@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+# Note: Please make sure the compiler compiles the assembly code below with
+# pc-relative address. Also the branch instructions should use relative
+# addresses only.
+
+#include "../migration-test.h"
+
+.section .text
+
+        .globl  _start
+
+_start:
+        /* disable MMU to use phys mem address */
+        mrs     x0, sctlr_el1
+        bic     x0, x0, #(1<<0)
+        msr     sctlr_el1, x0
+        isb
+
+        /* traverse test memory region */
+        mov     x0, #ARM_TEST_MEM_START
+        mov     x1, #ARM_TEST_MEM_END
+
+        /* output char 'A' to PL011 */
+        mov     w3, 'A'
+        mov     x2, #ARM_MACH_VIRT_UART
+        strb    w3, [x2]
+
+        /* clean up memory */
+        mov     w3, #0
+        mov     x4, x0
+clean:
+        strb    w3, [x4]
+        add     x4, x4, #TEST_MEM_PAGE_SIZE
+        cmp     x4, x1
+        ble     clean
+
+        /* w5 keeps a counter so we can limit the output speed */
+        mov     w5, #0
+
+        /* main body */
+mainloop:
+        mov     x4, x0
+
+innerloop:
+        /* increment the first byte of each page by 1 */
+        ldrb    w3, [x4]
+        add     w3, w3, #1
+        and     w3, w3, #0xff
+        strb    w3, [x4]
+
+        /* make sure QEMU user space can see consistent data as MMU is off */
+        dc      civac, x4
+
+        add     x4, x4, #TEST_MEM_PAGE_SIZE
+        cmp     x4, x1
+        blt     innerloop
+
+        add     w5, w5, #1
+        and     w5, w5, #0xff
+        cmp     w5, #0
+        bne     mainloop
+
+        /* output char 'B' to PL011 */
+        mov     w3, 'B'
+        strb    w3, [x2]
+
+        b       mainloop
diff --git a/tests/migration/aarch64/a-b-kernel.h b/tests/migration/aarch64/a-b-kernel.h
new file mode 100644
index 0000000000..0a9b01137e
--- /dev/null
+++ b/tests/migration/aarch64/a-b-kernel.h
@@ -0,0 +1,18 @@
+/* This file is automatically generated from the assembly file in
+ * tests/migration/aarch64. Edit that file and then run "make all"
+ * inside tests/migration to update, and then remember to send both
+ * the header and the assembler differences in your patch submission.
+ */
+unsigned char aarch64_kernel[] = {
+  0x00, 0x10, 0x38, 0xd5, 0x00, 0xf8, 0x7f, 0x92, 0x00, 0x10, 0x18, 0xd5,
+  0xdf, 0x3f, 0x03, 0xd5, 0x00, 0x02, 0xa8, 0xd2, 0x01, 0xc8, 0xa8, 0xd2,
+  0x23, 0x08, 0x80, 0x52, 0x02, 0x20, 0xa1, 0xd2, 0x43, 0x00, 0x00, 0x39,
+  0x03, 0x00, 0x80, 0x52, 0xe4, 0x03, 0x00, 0xaa, 0x83, 0x00, 0x00, 0x39,
+  0x84, 0x04, 0x40, 0x91, 0x9f, 0x00, 0x01, 0xeb, 0xad, 0xff, 0xff, 0x54,
+  0x05, 0x00, 0x80, 0x52, 0xe4, 0x03, 0x00, 0xaa, 0x83, 0x00, 0x40, 0x39,
+  0x63, 0x04, 0x00, 0x11, 0x63, 0x1c, 0x00, 0x12, 0x83, 0x00, 0x00, 0x39,
+  0x24, 0x7e, 0x0b, 0xd5, 0x84, 0x04, 0x40, 0x91, 0x9f, 0x00, 0x01, 0xeb,
+  0x2b, 0xff, 0xff, 0x54, 0xa5, 0x04, 0x00, 0x11, 0xa5, 0x1c, 0x00, 0x12,
+  0xbf, 0x00, 0x00, 0x71, 0x81, 0xfe, 0xff, 0x54, 0x43, 0x08, 0x80, 0x52,
+  0x43, 0x00, 0x00, 0x39, 0xf1, 0xff, 0xff, 0x17
+};
diff --git a/tests/migration/migration-test.h b/tests/migration/migration-test.h
index c4c0c526b6..03c252368a 100644
--- a/tests/migration/migration-test.h
+++ b/tests/migration/migration-test.h
@@ -14,8 +14,21 @@
 #define X86_TEST_MEM_START (1 * 1024 * 1024)
 #define X86_TEST_MEM_END   (100 * 1024 * 1024)
 
+/* S390 */
+#define S390_TEST_MEM_START (1 * 1024 * 1024)
+#define S390_TEST_MEM_END   (100 * 1024 * 1024)
+
 /* PPC */
 #define PPC_TEST_MEM_START (1 * 1024 * 1024)
 #define PPC_TEST_MEM_END   (100 * 1024 * 1024)
 
+/* ARM */
+#define ARM_TEST_MEM_START (0x40000000 + 1 * 1024 * 1024)
+#define ARM_TEST_MEM_END   (0x40000000 + 100 * 1024 * 1024)
+#define ARM_MACH_VIRT_UART 0x09000000
+/* AArch64 kernel load address is 0x40080000, and the test memory starts at
+ * 0x40100000. So the maximum allowable kernel size is 512KB.
+ */
+#define ARM_TEST_MAX_KERNEL_SIZE (512 * 1024)
+
 #endif /* _TEST_MIGRATION_H_ */
diff --git a/tests/migration/s390x/Makefile b/tests/migration/s390x/Makefile
new file mode 100644
index 0000000000..6393c3e5b9
--- /dev/null
+++ b/tests/migration/s390x/Makefile
@@ -0,0 +1,24 @@
+# To specify cross compiler prefix, use CROSS_PREFIX=
+#   $ make CROSS_PREFIX=s390x-linux-gnu-
+
+.PHONY: all clean
+all: a-b-bios.h
+fwdir=../../../pc-bios/s390-ccw
+
+CFLAGS+=-ffreestanding -fno-delete-null-pointer-checks -fPIE -Os \
+	-msoft-float -march=z900 -fno-asynchronous-unwind-tables -Wl,-pie \
+	-Wl,--build-id=none -nostdlib
+
+a-b-bios.h: s390x.elf
+	echo "$$__note" > header.tmp
+	xxd -i $< | sed -e 's/.*int.*//' >> header.tmp
+	mv header.tmp $@
+
+# We use common-page-size=16 to avoid big padding in the ELF file
+s390x.elf: a-b-bios.c
+	$(CROSS_PREFIX)gcc $(CFLAGS) -I$(fwdir) $(fwdir)/start.S \
+		$(fwdir)/sclp.c -Wl,-zcommon-page-size=16 -o $@ $<
+	$(CROSS_PREFIX)strip $@
+
+clean:
+	@rm -rf *.elf *.o
diff --git a/tests/migration/s390x/a-b-bios.c b/tests/migration/s390x/a-b-bios.c
new file mode 100644
index 0000000000..a0327cd153
--- /dev/null
+++ b/tests/migration/s390x/a-b-bios.c
@@ -0,0 +1,36 @@
+/*
+ * S390 guest code used in migration tests
+ *
+ * Copyright 2018 Thomas Huth, Red Hat Inc.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#define LOADPARM_LEN 8  /* Needed for sclp.h */
+
+#include <libc.h>
+#include <s390-ccw.h>
+#include <sclp.h>
+
+char stack[0x8000] __attribute__((aligned(4096)));
+
+#define START_ADDRESS  (1024 * 1024)
+#define END_ADDRESS    (100 * 1024 * 1024)
+
+void main(void)
+{
+    unsigned long addr;
+
+    sclp_setup();
+    sclp_print("A");
+
+    while (1) {
+        for (addr = START_ADDRESS; addr < END_ADDRESS; addr += 4096) {
+            *(volatile char *)addr += 1;  /* Change pages */
+        }
+        sclp_print("B");
+    }
+}
diff --git a/tests/migration/s390x/a-b-bios.h b/tests/migration/s390x/a-b-bios.h
new file mode 100644
index 0000000000..e722dc7c40
--- /dev/null
+++ b/tests/migration/s390x/a-b-bios.h
@@ -0,0 +1,253 @@
+/* This file is automatically generated from the a-b-bios.c file in
+ * tests/migration/s390x. Edit that file and then run "make all"
+ * inside tests/migration to update, and then remember to send both
+ * the header and the assembler differences in your patch submission.
+ */
+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, 0x40, 0x00, 0x38, 0x00, 0x07, 0x00, 0x40,
+  0x00, 0x0c, 0x00, 0x0b, 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,
+  0x00, 0x00, 0x01, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
+  0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x01, 0xc8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc8,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc8, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f,
+  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, 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, 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, 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,
+  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,
+  0xf0, 0x00, 0x00, 0x25, 0x94, 0xfd, 0xf0, 0x06, 0xeb, 0x00, 0xf0, 0x00,
+  0x00, 0x2f, 0x07, 0xfe, 0x07, 0x07, 0x07, 0x07, 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,
+  0x18, 0x31, 0xa7, 0x1a, 0x00, 0x06, 0x40, 0x10, 0x20, 0x08, 0xa7, 0x3a,
+  0x00, 0x0e, 0xa7, 0x18, 0x1a, 0x00, 0x40, 0x30, 0x20, 0x00, 0x92, 0x00,
+  0x20, 0x02, 0x40, 0x10, 0x20, 0x0a, 0xe3, 0x20, 0xd0, 0x00, 0x00, 0x04,
+  0xc0, 0xe5, 0xff, 0xff, 0xff, 0xac, 0xe3, 0x40, 0xf1, 0x10, 0x00, 0x04,
+  0xb9, 0x04, 0x00, 0x2b, 0xeb, 0xbf, 0xf0, 0xf8, 0x00, 0x04, 0x07, 0xf4,
+  0xb9, 0x04, 0x00, 0x51, 0xa7, 0x5b, 0x00, 0x01, 0xa7, 0x09, 0x0f, 0xf7,
+  0xb9, 0x21, 0x00, 0x50, 0xa7, 0x24, 0xff, 0xd7, 0x41, 0xeb, 0x20, 0x00,
+  0x95, 0x0a, 0xe0, 0x00, 0xa7, 0x74, 0x00, 0x08, 0x41, 0x11, 0x40, 0x0e,
+  0x92, 0x0d, 0x10, 0x00, 0xb9, 0x04, 0x00, 0x15, 0x43, 0x5b, 0x20, 0x00,
+  0x42, 0x51, 0x40, 0x0e, 0xa7, 0xbb, 0x00, 0x01, 0x41, 0x10, 0x10, 0x01,
+  0xa7, 0xf4, 0xff, 0xbf, 0xc0, 0x50, 0x00, 0x00, 0x00, 0xd4, 0xc0, 0x10,
+  0x00, 0x00, 0x0d, 0xd9, 0xa7, 0x48, 0x00, 0x1c, 0x40, 0x40, 0x10, 0x00,
+  0x50, 0x20, 0x10, 0x0c, 0xa7, 0x48, 0x00, 0x04, 0xe3, 0x20, 0x50, 0x00,
+  0x00, 0x04, 0x40, 0x40, 0x10, 0x0a, 0x50, 0x30, 0x10, 0x10, 0xc0, 0xf4,
+  0xff, 0xff, 0xff, 0x6b, 0xa7, 0x39, 0x00, 0x40, 0xa7, 0x29, 0x00, 0x00,
+  0xc0, 0xf4, 0xff, 0xff, 0xff, 0xe4, 0x07, 0x07, 0xb9, 0x04, 0x00, 0x13,
+  0xa7, 0x2a, 0xff, 0xff, 0xb9, 0x04, 0x00, 0x34, 0xa7, 0x48, 0x00, 0x01,
+  0x15, 0x24, 0xa7, 0x24, 0x00, 0x07, 0xb9, 0x04, 0x00, 0x21, 0xc0, 0xf4,
+  0xff, 0xff, 0xff, 0x7f, 0xa7, 0x29, 0xff, 0xff, 0x07, 0xfe, 0x07, 0x07,
+  0xa7, 0x39, 0x00, 0x00, 0x41, 0x13, 0x20, 0x00, 0x95, 0x00, 0x10, 0x00,
+  0xa7, 0x74, 0x00, 0x05, 0xc0, 0xf4, 0xff, 0xff, 0xff, 0x70, 0xa7, 0x3b,
+  0x00, 0x01, 0xa7, 0xf4, 0xff, 0xf5, 0x07, 0x07, 0xeb, 0xbf, 0xf0, 0x58,
+  0x00, 0x24, 0xc0, 0xd0, 0x00, 0x00, 0x00, 0x91, 0xa7, 0xfb, 0xff, 0x60,
+  0xb9, 0x04, 0x00, 0xb2, 0xa7, 0x19, 0x00, 0x20, 0xc0, 0x20, 0x00, 0x00,
+  0x0d, 0x8c, 0x92, 0x00, 0x20, 0x00, 0xa7, 0x2b, 0x00, 0x01, 0xa7, 0x17,
+  0xff, 0xfc, 0xc0, 0x10, 0x00, 0x00, 0x0d, 0x83, 0xa7, 0x28, 0x00, 0x20,
+  0x40, 0x20, 0x10, 0x00, 0xe3, 0x20, 0xd0, 0x00, 0x00, 0x04, 0xc0, 0xe5,
+  0xff, 0xff, 0xff, 0x1d, 0x12, 0x22, 0xa7, 0x74, 0x00, 0x17, 0xa7, 0x19,
+  0x00, 0x00, 0xc0, 0x40, 0x00, 0x00, 0x00, 0x75, 0xc0, 0x50, 0x00, 0x00,
+  0x0d, 0x7a, 0xa7, 0x29, 0x00, 0x08, 0xe3, 0x31, 0x50, 0x00, 0x00, 0x90,
+  0x43, 0x33, 0x40, 0x00, 0x42, 0x31, 0xb0, 0x00, 0xa7, 0x1b, 0x00, 0x01,
+  0xa7, 0x27, 0xff, 0xf7, 0xe3, 0x40, 0xf1, 0x10, 0x00, 0x04, 0xeb, 0xbf,
+  0xf0, 0xf8, 0x00, 0x04, 0x07, 0xf4, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
+  0xeb, 0xaf, 0xf0, 0x50, 0x00, 0x24, 0xc0, 0xd0, 0x00, 0x00, 0x00, 0x51,
+  0xa7, 0xfb, 0xff, 0x60, 0xa7, 0x19, 0x0f, 0xf8, 0xb9, 0x21, 0x00, 0x31,
+  0xb9, 0x04, 0x00, 0xa2, 0xa7, 0xc4, 0x00, 0x2d, 0xa7, 0xb9, 0x0f, 0xf8,
+  0xc0, 0x10, 0x00, 0x00, 0x0d, 0x42, 0xa7, 0x28, 0x10, 0x00, 0x40, 0x20,
+  0x10, 0x00, 0x92, 0x00, 0x10, 0x02, 0xe3, 0x20, 0xd0, 0x00, 0x00, 0x04,
+  0xc0, 0xe5, 0xff, 0xff, 0xfe, 0xda, 0xa7, 0xbb, 0x00, 0x01, 0xa7, 0x19,
+  0x00, 0x00, 0xc0, 0x20, 0x00, 0x00, 0x0d, 0x2f, 0xa7, 0xb7, 0x00, 0x17,
+  0xc0, 0x10, 0x00, 0x00, 0x0d, 0x2a, 0xe3, 0x40, 0xf1, 0x10, 0x00, 0x04,
+  0xe3, 0x20, 0x10, 0x08, 0x00, 0x91, 0xa7, 0x2a, 0xff, 0xf9, 0xb9, 0x14,
+  0x00, 0x22, 0xeb, 0xaf, 0xf0, 0xf0, 0x00, 0x04, 0x07, 0xf4, 0xb9, 0x04,
+  0x00, 0xb3, 0xa7, 0xf4, 0xff, 0xd5, 0x43, 0x31, 0x20, 0x0f, 0x42, 0x31,
+  0xa0, 0x00, 0xa7, 0x1b, 0x00, 0x01, 0xa7, 0xf4, 0xff, 0xe3, 0x07, 0x07,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x76, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x78, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x77, 0x00, 0x05, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x20, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x3c, 0x28, 0x2b, 0x7c, 0x26, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x2e, 0x2d, 0x2f, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2c, 0x25, 0x5f, 0x3e, 0x3f,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x60, 0x3a, 0x23,
+  0x40, 0x27, 0x3d, 0x22, 0x2e, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+  0x68, 0x69, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x6a, 0x6b, 0x6c,
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