[PATCH v7 04/24] migration: push Error **errp into vmstate_load()

Arun Menon posted 24 patches 3 months, 3 weeks ago
Maintainers: Stefan Berger <stefanb@linux.vnet.ibm.com>, "Michael S. Tsirkin" <mst@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>, Dmitry Osipenko <dmitry.osipenko@collabora.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Cornelia Huck <cohuck@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Matthew Rosato <mjrosato@linux.ibm.com>, Nicholas Piggin <npiggin@gmail.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, Fam Zheng <fam@euphon.net>, Alex Williamson <alex.williamson@redhat.com>, "Cédric Le Goater" <clg@redhat.com>, Hailiang Zhang <zhanghailiang@xfusion.com>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, Steve Sistare <steven.sistare@oracle.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>
There is a newer version of this series
[PATCH v7 04/24] migration: push Error **errp into vmstate_load()
Posted by Arun Menon 3 months, 3 weeks ago
This is an incremental step in converting vmstate loading
code to report error via Error objects instead of directly
printing it to console/monitor.
It is ensured that vmstate_load() must report an error
in errp, in case of failure.

Signed-off-by: Arun Menon <armenon@redhat.com>
---
 migration/savevm.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/migration/savevm.c b/migration/savevm.c
index 842ff3dc6d5ccb05f7d33cef9f7319b141419501..736410be867a29efa24d749528c9bc203a3e8131 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -963,14 +963,20 @@ void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd,
     }
 }
 
-static int vmstate_load(QEMUFile *f, SaveStateEntry *se)
+static int vmstate_load(QEMUFile *f, SaveStateEntry *se, Error **errp)
 {
+    int ret;
     trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
     if (!se->vmsd) {         /* Old style */
-        return se->ops->load_state(f, se->opaque, se->load_version_id);
+        ret = se->ops->load_state(f, se->opaque, se->load_version_id);
+        if (ret < 0) {
+            error_setg(errp, "Failed to load VM version_id: '%d', ret: '%d'",
+                       se->load_version_id, ret);
+        }
+        return ret;
     }
     return vmstate_load_state(f, se->vmsd, se->opaque, se->load_version_id,
-                              NULL);
+                              errp);
 }
 
 static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
@@ -2741,7 +2747,7 @@ qemu_loadvm_section_start_full(QEMUFile *f, uint8_t type)
         start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
     }
 
-    ret = vmstate_load(f, se);
+    ret = vmstate_load(f, se, NULL);
     if (ret < 0) {
         error_report("error while loading state for instance 0x%"PRIx32" of"
                      " device '%s'", instance_id, idstr);
@@ -2794,7 +2800,7 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t type)
         start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
     }
 
-    ret = vmstate_load(f, se);
+    ret = vmstate_load(f, se, NULL);
     if (ret < 0) {
         error_report("error while loading state section id %d(%s)",
                      section_id, se->idstr);

-- 
2.50.0
Re: [PATCH v7 04/24] migration: push Error **errp into vmstate_load()
Posted by Marc-André Lureau 3 months, 3 weeks ago
On Fri, Jul 25, 2025 at 4:19 PM Arun Menon <armenon@redhat.com> wrote:

> This is an incremental step in converting vmstate loading
> code to report error via Error objects instead of directly
> printing it to console/monitor.
> It is ensured that vmstate_load() must report an error
> in errp, in case of failure.
>
> Signed-off-by: Arun Menon <armenon@redhat.com>
>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>


> ---
>  migration/savevm.c | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/migration/savevm.c b/migration/savevm.c
> index
> 842ff3dc6d5ccb05f7d33cef9f7319b141419501..736410be867a29efa24d749528c9bc203a3e8131
> 100644
> --- a/migration/savevm.c
> +++ b/migration/savevm.c
> @@ -963,14 +963,20 @@ void vmstate_unregister(VMStateIf *obj, const
> VMStateDescription *vmsd,
>      }
>  }
>
> -static int vmstate_load(QEMUFile *f, SaveStateEntry *se)
> +static int vmstate_load(QEMUFile *f, SaveStateEntry *se, Error **errp)
>  {
> +    int ret;
>      trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
>      if (!se->vmsd) {         /* Old style */
> -        return se->ops->load_state(f, se->opaque, se->load_version_id);
> +        ret = se->ops->load_state(f, se->opaque, se->load_version_id);
> +        if (ret < 0) {
> +            error_setg(errp, "Failed to load VM version_id: '%d', ret:
> '%d'",
> +                       se->load_version_id, ret);
> +        }
> +        return ret;
>      }
>      return vmstate_load_state(f, se->vmsd, se->opaque,
> se->load_version_id,
> -                              NULL);
> +                              errp);
>  }
>
>  static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
> @@ -2741,7 +2747,7 @@ qemu_loadvm_section_start_full(QEMUFile *f, uint8_t
> type)
>          start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
>      }
>
> -    ret = vmstate_load(f, se);
> +    ret = vmstate_load(f, se, NULL);
>      if (ret < 0) {
>          error_report("error while loading state for instance 0x%"PRIx32"
> of"
>                       " device '%s'", instance_id, idstr);
> @@ -2794,7 +2800,7 @@ qemu_loadvm_section_part_end(QEMUFile *f, uint8_t
> type)
>          start_ts = qemu_clock_get_us(QEMU_CLOCK_REALTIME);
>      }
>
> -    ret = vmstate_load(f, se);
> +    ret = vmstate_load(f, se, NULL);
>      if (ret < 0) {
>          error_report("error while loading state section id %d(%s)",
>                       section_id, se->idstr);
>
> --
> 2.50.0
>
>