[PULL 00/11] Migration 20231004 patches

[PULL 00/11] Migration 20231004 patches

[Juan Quintela]

The following changes since commit da1034094d375afe9e3d8ec8980550ea0f06f7e0:

  Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging (2023-10-03 07:43:44 -0400)

are available in the Git repository at:

  https://gitlab.com/juan.quintela/qemu.git tags/migration-20231004-pull-request

for you to fetch changes up to 579cedf430582b37f804f6b6ed131554cebb11b5:

  migration: Unify and trace vmstate field_exists() checks (2023-10-04 13:19:47 +0200)

----------------------------------------------------------------
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

----------------------------------------------------------------

Daniil Tatianin (3):
  i386/a-b-bootblock: factor test memory addresses out into constants
  i386/a-b-bootblock: zero the first byte of each page on start
  s390x/a-b-bios: zero the first byte of each page on start

Li Zhijian (1):
  migration/rdma: zore out head.repeat to make the error more clear

Peter Xu (3):
  MAINTAINERS: Add entry for rdma migration
  migration: Add co-maintainers for migration
  migration: Unify and trace vmstate field_exists() checks

Steve Sistare (2):
  migration: file URI
  migration: file URI offset

Tejus GK (2):
  migration/vmstate: Introduce vmstate_save_state_with_err
  migration: Update error description outside migration.c

 MAINTAINERS                          |  12 +-
 include/migration/vmstate.h          |   4 +-
 migration/file.h                     |  14 +
 tests/migration/i386/a-b-bootblock.h |  16 +-
 tests/migration/s390x/a-b-bios.h     | 404 ++++++++++++++-------------
 migration/file.c                     | 103 +++++++
 migration/migration.c                |   5 +
 migration/rdma.c                     |   2 +-
 migration/savevm.c                   |  19 +-
 migration/vmstate.c                  |  53 +++-
 tests/migration/s390x/a-b-bios.c     |   8 +
 migration/meson.build                |   1 +
 migration/trace-events               |   5 +
 qemu-options.hx                      |   7 +-
 tests/migration/i386/a-b-bootblock.S |  18 +-
 15 files changed, 449 insertions(+), 222 deletions(-)
 create mode 100644 migration/file.h
 create mode 100644 migration/file.c

-- 
2.41.0

[PULL 01/11] migration/vmstate: Introduce vmstate_save_state_with_err

[Juan Quintela]

From: Tejus GK <tejus.gk@nutanix.com>

Currently, a few code paths exist in the function vmstate_save_state_v,
which ultimately leads to a migration failure. However, an update in the
current MigrationState for the error description is never done.

vmstate.c somehow doesn't seem to allow	the use	of migrate_set_error due
to some	dependencies for unit tests. Hence, this patch introduces a new
function vmstate_save_state_with_err, which will eventually propagate
the error message to savevm.c where a migrate_set_error	call can be
eventually done.

Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Tejus GK <tejus.gk@nutanix.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231003065538.244752-2-tejus.gk@nutanix.com>
---
 include/migration/vmstate.h |  4 +++-
 migration/savevm.c          |  2 +-
 migration/vmstate.c         | 12 +++++++++---
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index e4db910339..1a31fb7293 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/savevm.c b/migration/savevm.c
index bb3e99194c..1f65294bf4 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1000,7 +1000,7 @@ 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) {
             return ret;
         }
diff --git a/migration/vmstate.c b/migration/vmstate.c
index 438ea77cfa..dd9c76dbeb 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -315,11 +315,17 @@ 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;
@@ -377,7 +383,7 @@ 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);
-- 
2.41.0

[PULL 02/11] migration: Update error description outside migration.c

[Juan Quintela]

From: Tejus GK <tejus.gk@nutanix.com>

A few code paths exist in the source code,where a migration is
marked as failed via MIGRATION_STATUS_FAILED, but the failure happens
outside	of migration.c

In such	cases, an error_report() call is made, however the current
MigrationState is never	updated	with the error description, and	hence
clients	like libvirt never know	the actual reason for the failure.

This patch covers such cases outside of	migration.c and	updates	the
error description at the appropriate places.

Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Tejus GK <tejus.gk@nutanix.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231003065538.244752-3-tejus.gk@nutanix.com>
---
 migration/savevm.c  | 17 ++++++++++++++---
 migration/vmstate.c |  7 ++++---
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 1f65294bf4..60eec7c31f 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;
@@ -1002,6 +1004,8 @@ static int vmstate_save(QEMUFile *f, SaveStateEntry *se, JSONWriter *vmdesc)
     } else {
         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/vmstate.c b/migration/vmstate.c
index dd9c76dbeb..4cde30bf2d 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"
@@ -336,7 +337,7 @@ 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;
         }
     }
@@ -389,8 +390,8 @@ int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
                                      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);
                     }
-- 
2.41.0

[PULL 03/11] MAINTAINERS: Add entry for rdma migration

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

It's not obvious to many that RDMA migration is in Odd Fixes stage for a
long time.  Add an explicit sub entry for it (besides migration, which
already covers the rdma files) to be clear on that, meanwhile add Zhijian
as Reviewer, so Zhijian can see the patches and review when he still has
the bandwidth.

Cc: Daniel P. Berrangé <berrange@redhat.com>
Cc: Juan Quintela <quintela@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Zhijian Li (Fujitsu) <lizhijian@fujitsu.com>
Cc: Fabiano Rosas <farosas@suse.de>

Acked-by: Li Zhijian <lizhijian@fujitsu.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230925133441.265455-1-peterx@redhat.com>
---
 MAINTAINERS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 81625f036b..af730a327c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3222,6 +3222,15 @@ 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>
-- 
2.41.0

[PULL 04/11] migration: Add co-maintainers for migration

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

Per the qemu upstream call a few hours ago, proposing Fabiano and myself as
the co-maintainer for migration subsystem to help Juan.

Cc: Fabiano Rosas <farosas@suse.de>
Cc: Juan Quintela <quintela@redhat.com>
Acked-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231003143847.9245-1-peterx@redhat.com>
---
 MAINTAINERS | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index af730a327c..79db298787 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
-- 
2.41.0

[PULL 05/11] migration/rdma: zore out head.repeat to make the error more clear

[Juan Quintela]

From: Li Zhijian <lizhijian@fujitsu.com>

Previously, we got a confusion error that complains
the RDMAControlHeader.repeat:
qemu-system-x86_64: rdma: Too many requests in this message (3638950032).Bailing.

Actually, it's caused by an unexpected RDMAControlHeader.type.
After this patch, error will become:
qemu-system-x86_64: Unknown control message QEMU FILE

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230926100103.201564-2-lizhijian@fujitsu.com>
---
 migration/rdma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration/rdma.c b/migration/rdma.c
index 7d2726d5b6..cd5e1afe60 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;
-- 
2.41.0

[PULL 06/11] i386/a-b-bootblock: factor test memory addresses out into constants

[Juan Quintela]

From: Daniil Tatianin <d-tatianin@yandex-team.ru>

So that we have less magic numbers to deal with. This also allows us to
reuse these in the following commits.

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230919102346.2117963-2-d-tatianin@yandex-team.ru>
---
 tests/migration/i386/a-b-bootblock.S | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tests/migration/i386/a-b-bootblock.S b/tests/migration/i386/a-b-bootblock.S
index 3d464c7568..036216e4a7 100644
--- a/tests/migration/i386/a-b-bootblock.S
+++ b/tests/migration/i386/a-b-bootblock.S
@@ -34,6 +34,10 @@ 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
@@ -41,12 +45,11 @@ start:             # at 0x7c00 ?
         # bl keeps a counter so we limit the output speed
         mov $0, %bl
 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
-- 
2.41.0

[PULL 07/11] i386/a-b-bootblock: zero the first byte of each page on start

[Juan Quintela]

From: Daniil Tatianin <d-tatianin@yandex-team.ru>

The migration qtest all the way up to this point used to work by sheer
luck relying on the contents of all pages from 1MiB to 100MiB to contain
the same one value in the first byte initially.

This easily breaks if we reduce the amount of RAM for the test instances
from 150MiB to e.g 110MiB since that makes SeaBIOS dirty some of the
pages starting at about 0x5dd2000 (~93 MiB) as it reuses those for the
HighMemory allocator since commit dc88f9b72df ("malloc: use large
ZoneHigh when there is enough memory").

This would result in the following errors:
    12/60 qemu:qtest+qtest-x86_64 / qtest-x86_64/migration-test                 ERROR           2.74s   killed by signal 6 SIGABRT
    stderr:
    Memory content inconsistency at 5dd2000 first_byte = cc last_byte = cb current = 9e hit_edge = 1
    Memory content inconsistency at 5dd3000 first_byte = cc last_byte = cb current = 89 hit_edge = 1
    Memory content inconsistency at 5dd4000 first_byte = cc last_byte = cb current = 23 hit_edge = 1
    Memory content inconsistency at 5dd5000 first_byte = cc last_byte = cb current = 31 hit_edge = 1
    Memory content inconsistency at 5dd6000 first_byte = cc last_byte = cb current = 70 hit_edge = 1
    Memory content inconsistency at 5dd7000 first_byte = cc last_byte = cb current = ff hit_edge = 1
    Memory content inconsistency at 5dd8000 first_byte = cc last_byte = cb current = 54 hit_edge = 1
    Memory content inconsistency at 5dd9000 first_byte = cc last_byte = cb current = 64 hit_edge = 1
    Memory content inconsistency at 5dda000 first_byte = cc last_byte = cb current = 1d hit_edge = 1
    Memory content inconsistency at 5ddb000 first_byte = cc last_byte = cb current = 1a hit_edge = 1
    and in another 26 pages**
    ERROR:../tests/qtest/migration-test.c:300:check_guests_ram: assertion failed: (bad == 0)

Fix this by always zeroing the first byte of each page in the range so
that we get consistent results no matter the initial contents.

Fixes: ea0c6d62391 ("test: Postcopy")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230919102346.2117963-3-d-tatianin@yandex-team.ru>
---
 tests/migration/i386/a-b-bootblock.h | 16 ++++++++--------
 tests/migration/i386/a-b-bootblock.S |  9 +++++++++
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/tests/migration/i386/a-b-bootblock.h b/tests/migration/i386/a-b-bootblock.h
index b7b0fce2ee..5b523917ce 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/i386/a-b-bootblock.S b/tests/migration/i386/a-b-bootblock.S
index 036216e4a7..6bb9999d60 100644
--- a/tests/migration/i386/a-b-bootblock.S
+++ b/tests/migration/i386/a-b-bootblock.S
@@ -44,6 +44,15 @@ start:             # at 0x7c00 ?
 
         # 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:
         mov $TEST_MEM_START,%eax
 innerloop:
-- 
2.41.0

[PULL 08/11] s390x/a-b-bios: zero the first byte of each page on start

[Juan Quintela]

From: Daniil Tatianin <d-tatianin@yandex-team.ru>

Same as with the x86 verison of this test, we relied on the contents of
all pages in RAM to be the same across the entire test range, which is
very fragile. Zero the first byte of each page before running the
increment loop to fix this.

Fixes: 5571dc824b ("tests/migration: Enable the migration test on s390x, too")
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230919102346.2117963-4-d-tatianin@yandex-team.ru>
---
 tests/migration/s390x/a-b-bios.h | 404 ++++++++++++++++---------------
 tests/migration/s390x/a-b-bios.c |   8 +
 2 files changed, 223 insertions(+), 189 deletions(-)

diff --git a/tests/migration/s390x/a-b-bios.h b/tests/migration/s390x/a-b-bios.h
index e722dc7c40..96103dadbb 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,
-  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,
+  0x00, 0x00, 0x00, 0x01, 0x80, 0x00, 0x00, 0x00, 0xeb, 0xbf, 0xf0, 0x58,
+  0x00, 0x24, 0xc0, 0x10, 0x00, 0x00, 0x4e, 0x0d, 0xa7, 0xfb, 0xff, 0x60,
+  0xb2, 0x20, 0x00, 0x21, 0xb2, 0x22, 0x00, 0xb0, 0x88, 0xb0, 0x00, 0x1c,
+  0xc0, 0xe5, 0xff, 0xff, 0xff, 0x91, 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, 0x25,
+  0xa7, 0xfb, 0xff, 0x60, 0xa7, 0xb9, 0x00, 0x00, 0xa7, 0x19, 0x00, 0x00,
+  0xc0, 0x40, 0x00, 0x00, 0x4d, 0xd8, 0xa7, 0x3b, 0x00, 0x01, 0xa7, 0x37,
+  0x00, 0x23, 0xc0, 0x20, 0x00, 0x00, 0x4d, 0xd1, 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, 0xd8, 0xc0, 0x10, 0x00, 0x00, 0x4d, 0x8d,
+  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, 0x95, 0xa7, 0xfb, 0xff, 0x60, 0xb9, 0x04, 0x00, 0xb2,
+  0xa7, 0x19, 0x00, 0x20, 0xc0, 0x20, 0x00, 0x00, 0x4d, 0x40, 0x92, 0x00,
+  0x20, 0x00, 0xa7, 0x2b, 0x00, 0x01, 0xa7, 0x17, 0xff, 0xfc, 0xc0, 0x10,
+  0x00, 0x00, 0x4d, 0x37, 0xa7, 0x28, 0x10, 0x00, 0x40, 0x20, 0x10, 0x00,
+  0xe3, 0x20, 0xd0, 0x00, 0x00, 0x04, 0xc0, 0xe5, 0xff, 0xff, 0xff, 0x1d,
+  0x12, 0x22, 0xa7, 0x74, 0x00, 0x19, 0xa7, 0x19, 0x00, 0x00, 0xc0, 0x40,
+  0x00, 0x00, 0x00, 0x79, 0xa7, 0x39, 0x00, 0x08, 0xc0, 0x20, 0x00, 0x00,
+  0x4d, 0x2c, 0x41, 0x21, 0x20, 0x00, 0xe3, 0x20, 0x20, 0x00, 0x00, 0x90,
+  0x43, 0x22, 0x40, 0x00, 0x42, 0x21, 0xb0, 0x00, 0xa7, 0x1b, 0x00, 0x01,
+  0xa7, 0x37, 0xff, 0xf2, 0xe3, 0x40, 0xf1, 0x10, 0x00, 0x04, 0xeb, 0xbf,
+  0xf0, 0xf8, 0x00, 0x04, 0x07, 0xf4, 0x07, 0x07, 0xeb, 0xaf, 0xf0, 0x50,
+  0x00, 0x24, 0xc0, 0xd0, 0x00, 0x00, 0x00, 0x55, 0xa7, 0xfb, 0xff, 0x60,
+  0xa7, 0x19, 0x0f, 0xf8, 0xb9, 0x21, 0x00, 0x31, 0xb9, 0x04, 0x00, 0xa2,
+  0xa7, 0xc4, 0x00, 0x2a, 0xa7, 0xb9, 0x0f, 0xf8, 0xc0, 0x10, 0x00, 0x00,
+  0x4c, 0xf6, 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, 0xa7, 0xb7,
+  0x00, 0x17, 0xc0, 0x10, 0x00, 0x00, 0x4c, 0xe1, 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, 0xd8, 0xc0, 0x20, 0x00, 0x00,
+  0x4c, 0xcc, 0x41, 0x31, 0xa0, 0x00, 0x41, 0x21, 0x20, 0x00, 0xa7, 0x1b,
+  0x00, 0x01, 0xd2, 0x00, 0x30, 0x00, 0x20, 0x0f, 0xa7, 0xf4, 0xff, 0xdd,
+  0x07, 0x07, 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,
-  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,
-  0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
-  0x2e, 0x2e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 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, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+  0x79, 0x7a, 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, 0x41, 0x42, 0x43,
-  0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
-  0x2e, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x2e, 0x2e,
-  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
-  0x59, 0x5a, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x30, 0x31, 0x32, 0x33,
-  0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
-  0x41, 0x00, 0x42, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x2e, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
+  0x51, 0x52, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x53, 0x54,
+  0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
+  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2e, 0x2e,
+  0x2e, 0x2e, 0x2e, 0x2e, 0x41, 0x00, 0x42, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
   0x6f, 0xff, 0xfe, 0xf5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xd8,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x02, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06,
@@ -163,91 +177,103 @@ unsigned char s390x_elf[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x15,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x6f, 0xff, 0xff, 0xfb, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
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+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0xf0, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x01, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x58, 0x00, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0xf0,
+  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
 };
diff --git a/tests/migration/s390x/a-b-bios.c b/tests/migration/s390x/a-b-bios.c
index a0327cd153..ff99a3ef57 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 */
-- 
2.41.0

[PULL 09/11] migration: file URI

[Juan Quintela]

From: Steve Sistare <steven.sistare@oracle.com>

Extend the migration URI to support file:<filename>.  This can be used for
any migration scenario that does not require a reverse path.  It can be
used as an alternative to 'exec:cat > file' in minimized containers that
do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
It can be used in HMP commands, and as a qemu command-line parameter.

For best performance, guest ram should be shared and x-ignore-shared
should be true, so guest pages are not written to the file, in which case
the guest may remain running.  If ram is not so configured, then the user
is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
the same page, causing it to be appended to the file multiple times,
and the file may grow unboundedly.  That issue is being addressed in the
"fixed-ram" patch series.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>
---
 migration/file.h       | 14 ++++++++++
 migration/file.c       | 62 ++++++++++++++++++++++++++++++++++++++++++
 migration/migration.c  |  5 ++++
 migration/meson.build  |  1 +
 migration/trace-events |  4 +++
 qemu-options.hx        |  6 +++-
 6 files changed, 91 insertions(+), 1 deletion(-)
 create mode 100644 migration/file.h
 create mode 100644 migration/file.c

diff --git a/migration/file.h b/migration/file.h
new file mode 100644
index 0000000000..90fa4849e0
--- /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/file.c b/migration/file.c
new file mode 100644
index 0000000000..0a65c43fdd
--- /dev/null
+++ b/migration/file.c
@@ -0,0 +1,62 @@
+/*
+ * 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 "channel.h"
+#include "file.h"
+#include "migration.h"
+#include "io/channel-file.h"
+#include "io/channel-util.h"
+#include "trace.h"
+
+void file_start_outgoing_migration(MigrationState *s, const char *filename,
+                                   Error **errp)
+{
+    g_autoptr(QIOChannelFile) fioc = NULL;
+    QIOChannel *ioc;
+
+    trace_migration_file_outgoing(filename);
+
+    fioc = qio_channel_file_new_path(filename, O_CREAT | O_WRONLY | O_TRUNC,
+                                     0600, errp);
+    if (!fioc) {
+        return;
+    }
+
+    ioc = QIO_CHANNEL(fioc);
+    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 *filename, Error **errp)
+{
+    QIOChannelFile *fioc = NULL;
+    QIOChannel *ioc;
+
+    trace_migration_file_incoming(filename);
+
+    fioc = qio_channel_file_new_path(filename, O_RDONLY, 0, errp);
+    if (!fioc) {
+        return;
+    }
+
+    ioc = QIO_CHANNEL(fioc);
+    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/migration.c b/migration/migration.c
index 6d3cf5d5cd..585d3c8f55 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/meson.build b/migration/meson.build
index 1ae28523a1..92b1cc4297 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/trace-events b/migration/trace-events
index 63483732ce..3e9649ab2a 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -311,6 +311,10 @@ 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/qemu-options.hx b/qemu-options.hx
index 9ce8a5b957..93e638c097 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\n" \
     "-incoming exec:cmdline\n" \
     "                accept incoming migration on given file descriptor\n" \
     "                or from given external command\n" \
@@ -4722,7 +4723,10 @@ 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``
+    Accept incoming migration from a given file.
 
 ``-incoming exec:cmdline``
     Accept incoming migration as an output from specified external
-- 
2.41.0

Re: [PULL 09/11] migration: file URI

[Fabiano Rosas]

Juan Quintela <quintela@redhat.com> writes:

> From: Steve Sistare <steven.sistare@oracle.com>
>
> Extend the migration URI to support file:<filename>.  This can be used for
> any migration scenario that does not require a reverse path.  It can be
> used as an alternative to 'exec:cat > file' in minimized containers that
> do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
> It can be used in HMP commands, and as a qemu command-line parameter.
>
> For best performance, guest ram should be shared and x-ignore-shared
> should be true, so guest pages are not written to the file, in which case
> the guest may remain running.  If ram is not so configured, then the user
> is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
> the same page, causing it to be appended to the file multiple times,
> and the file may grow unboundedly.  That issue is being addressed in the
> "fixed-ram" patch series.
>
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> Tested-by: Michael Galaxy <mgalaxy@akamai.com>
> Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
> Reviewed-by: Fabiano Rosas <farosas@suse.de>
> Reviewed-by: Peter Xu <peterx@redhat.com>
> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> Reviewed-by: Juan Quintela <quintela@redhat.com>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>

Juan, FYI we have tests for this feature already reviewed and ready to
merge:

[PATCH v5 0/6] migration: Test the new "file:" migration
https://lore.kernel.org/r/20230712190742.22294-1-farosas@suse.de

Re: [PULL 09/11] migration: file URI

[Juan Quintela]

Fabiano Rosas <farosas@suse.de> wrote:
> Juan Quintela <quintela@redhat.com> writes:
>
>> From: Steve Sistare <steven.sistare@oracle.com>
>>
>> Extend the migration URI to support file:<filename>.  This can be used for
>> any migration scenario that does not require a reverse path.  It can be
>> used as an alternative to 'exec:cat > file' in minimized containers that
>> do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
>> It can be used in HMP commands, and as a qemu command-line parameter.
>>
>> For best performance, guest ram should be shared and x-ignore-shared
>> should be true, so guest pages are not written to the file, in which case
>> the guest may remain running.  If ram is not so configured, then the user
>> is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
>> the same page, causing it to be appended to the file multiple times,
>> and the file may grow unboundedly.  That issue is being addressed in the
>> "fixed-ram" patch series.
>>
>> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
>> Tested-by: Michael Galaxy <mgalaxy@akamai.com>
>> Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
>> Reviewed-by: Fabiano Rosas <farosas@suse.de>
>> Reviewed-by: Peter Xu <peterx@redhat.com>
>> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>> Reviewed-by: Juan Quintela <quintela@redhat.com>
>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>
>
> Juan, FYI we have tests for this feature already reviewed and ready to
> merge:
>
> [PATCH v5 0/6] migration: Test the new "file:" migration
> https://lore.kernel.org/r/20230712190742.22294-1-farosas@suse.de

I searched for URI and didn't found it.

Will got it on next PULL request.

Thanks, Juan.

Re: [PULL 09/11] migration: file URI

[Fabiano Rosas]

Juan Quintela <quintela@redhat.com> writes:

> Fabiano Rosas <farosas@suse.de> wrote:
>> Juan Quintela <quintela@redhat.com> writes:
>>
>>> From: Steve Sistare <steven.sistare@oracle.com>
>>>
>>> Extend the migration URI to support file:<filename>.  This can be used for
>>> any migration scenario that does not require a reverse path.  It can be
>>> used as an alternative to 'exec:cat > file' in minimized containers that
>>> do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
>>> It can be used in HMP commands, and as a qemu command-line parameter.
>>>
>>> For best performance, guest ram should be shared and x-ignore-shared
>>> should be true, so guest pages are not written to the file, in which case
>>> the guest may remain running.  If ram is not so configured, then the user
>>> is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
>>> the same page, causing it to be appended to the file multiple times,
>>> and the file may grow unboundedly.  That issue is being addressed in the
>>> "fixed-ram" patch series.
>>>
>>> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
>>> Tested-by: Michael Galaxy <mgalaxy@akamai.com>
>>> Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
>>> Reviewed-by: Fabiano Rosas <farosas@suse.de>
>>> Reviewed-by: Peter Xu <peterx@redhat.com>
>>> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>>> Reviewed-by: Juan Quintela <quintela@redhat.com>
>>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>>> Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>
>>
>> Juan, FYI we have tests for this feature already reviewed and ready to
>> merge:
>>
>> [PATCH v5 0/6] migration: Test the new "file:" migration
>> https://lore.kernel.org/r/20230712190742.22294-1-farosas@suse.de
>
> I searched for URI and didn't found it.
>
> Will got it on next PULL request.

Do you want me to do resend? It's no big deal.

Re: [PULL 09/11] migration: file URI

[Juan Quintela]

Fabiano Rosas <farosas@suse.de> wrote:
> Juan Quintela <quintela@redhat.com> writes:
>
>> Fabiano Rosas <farosas@suse.de> wrote:
>>> Juan Quintela <quintela@redhat.com> writes:
>>>
>>>> From: Steve Sistare <steven.sistare@oracle.com>
>>>>
>>>> Extend the migration URI to support file:<filename>.  This can be used for
>>>> any migration scenario that does not require a reverse path.  It can be
>>>> used as an alternative to 'exec:cat > file' in minimized containers that
>>>> do not contain /bin/sh, and it is easier to use than the fd:<fdname> URI.
>>>> It can be used in HMP commands, and as a qemu command-line parameter.
>>>>
>>>> For best performance, guest ram should be shared and x-ignore-shared
>>>> should be true, so guest pages are not written to the file, in which case
>>>> the guest may remain running.  If ram is not so configured, then the user
>>>> is advised to stop the guest first.  Otherwise, a busy guest may re-dirty
>>>> the same page, causing it to be appended to the file multiple times,
>>>> and the file may grow unboundedly.  That issue is being addressed in the
>>>> "fixed-ram" patch series.
>>>>
>>>> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
>>>> Tested-by: Michael Galaxy <mgalaxy@akamai.com>
>>>> Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
>>>> Reviewed-by: Fabiano Rosas <farosas@suse.de>
>>>> Reviewed-by: Peter Xu <peterx@redhat.com>
>>>> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>>>> Reviewed-by: Juan Quintela <quintela@redhat.com>
>>>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>>>> Message-ID: <1694182931-61390-2-git-send-email-steven.sistare@oracle.com>
>>>
>>> Juan, FYI we have tests for this feature already reviewed and ready to
>>> merge:
>>>
>>> [PATCH v5 0/6] migration: Test the new "file:" migration
>>> https://lore.kernel.org/r/20230712190742.22294-1-farosas@suse.de
>>
>> I searched for URI and didn't found it.
>>
>> Will got it on next PULL request.
>
> Do you want me to do resend? It's no big deal.

Not integrated already on my tree.

Thanks.

[PULL 10/11] migration: file URI offset

[Juan Quintela]

From: Steve Sistare <steven.sistare@oracle.com>

Allow an offset option to be specified as part of the file URI, in
the form "file:filename,offset=offset", where offset accepts the common
size suffixes, or the 0x prefix, but not both.  Migration data is written
to and read from the file starting at offset.  If unspecified, it defaults
to 0.

This is needed by libvirt to store its own data at the head of the file.

Suggested-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1694182931-61390-3-git-send-email-steven.sistare@oracle.com>
---
 migration/file.c | 45 +++++++++++++++++++++++++++++++++++++++++++--
 qemu-options.hx  |  7 ++++---
 2 files changed, 47 insertions(+), 5 deletions(-)

diff --git a/migration/file.c b/migration/file.c
index 0a65c43fdd..cf5b1bf365 100644
--- a/migration/file.c
+++ b/migration/file.c
@@ -6,6 +6,8 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/cutils.h"
+#include "qapi/error.h"
 #include "channel.h"
 #include "file.h"
 #include "migration.h"
@@ -13,14 +15,41 @@
 #include "io/channel-util.h"
 #include "trace.h"
 
-void file_start_outgoing_migration(MigrationState *s, const char *filename,
+#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) {
@@ -28,6 +57,9 @@ void file_start_outgoing_migration(MigrationState *s, const char *filename,
     }
 
     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);
 }
@@ -41,19 +73,28 @@ static gboolean file_accept_incoming_migration(QIOChannel *ioc,
     return G_SOURCE_REMOVE;
 }
 
-void file_start_incoming_migration(const char *filename, Error **errp)
+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,
diff --git a/qemu-options.hx b/qemu-options.hx
index 93e638c097..840b83d237 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4706,7 +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\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" \
@@ -4725,8 +4725,9 @@ SRST
 ``-incoming fd:fd``
     Accept incoming migration from a given file descriptor.
 
-``-incoming file:filename``
-    Accept incoming migration from a given file.
+``-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
-- 
2.41.0

[PULL 11/11] migration: Unify and trace vmstate field_exists() checks

[Juan Quintela]

From: Peter Xu <peterx@redhat.com>

For both save/load we actually share the logic on deciding whether a field
should exist.  Merge the checks into a helper and use it for both save and
load.  When doing so, add documentations and reformat the code to make it
much easier to read.

The real benefit here (besides code cleanups) is we add a trace-point for
this; this is a known spot where we can easily break migration
compatibilities between binaries, and this trace point will be critical for
us to identify such issues.

For example, this will be handy when debugging things like:

https://gitlab.com/qemu-project/qemu/-/issues/932

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230906204722.514474-1-peterx@redhat.com>
---
 migration/vmstate.c    | 34 ++++++++++++++++++++++++++--------
 migration/trace-events |  1 +
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/migration/vmstate.c b/migration/vmstate.c
index 4cde30bf2d..1cf9e45b85 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -26,6 +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;
@@ -105,10 +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);
@@ -349,10 +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);
diff --git a/migration/trace-events b/migration/trace-events
index 3e9649ab2a..002abe3a4e 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"
-- 
2.41.0

Re: [PULL 00/11] Migration 20231004 patches

[Stefan Hajnoczi]

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Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/8.2 for any user-visible changes.

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