From: Shameer Kolothum <skolothumtho@nvidia.com>
Date: Thu, 29 Jan 2026 13:32:05 +0000 (+0000)
Subject: hw/arm/smmuv3: Block migration when accel is enabled
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be0cf3c8f121f5c0ec398429666d2ef0e88aa37a;p=thirdparty%2Fqemu.git

hw/arm/smmuv3: Block migration when accel is enabled

Live migration is not supported when the SMMUv3 accelerator mode is
enabled. Add a migration blocker to prevent migration in this
configuration.

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
Message-id: 20260126104342.253965-28-skolothumtho@nvidia.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index e301bb467d..2be056d792 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -20,6 +20,7 @@
 #include "qemu/bitops.h"
 #include "hw/core/irq.h"
 #include "hw/core/sysbus.h"
+#include "migration/blocker.h"
 #include "migration/vmstate.h"
 #include "hw/core/qdev-properties.h"
 #include "hw/core/qdev.h"
@@ -1925,6 +1926,11 @@ static void smmu_realize(DeviceState *d, Error **errp)
 
     if (s->accel) {
         smmuv3_accel_init(s);
+        error_setg(&s->migration_blocker, "Migration not supported with SMMUv3 "
+                   "accelerator mode enabled");
+        if (migrate_add_blocker(&s->migration_blocker, errp) < 0) {
+            return;
+        }
     }
 
     c->parent_realize(d, &local_err);
diff --git a/include/hw/arm/smmuv3.h b/include/hw/arm/smmuv3.h
index 5616a8a2be..9c39acd5ca 100644
--- a/include/hw/arm/smmuv3.h
+++ b/include/hw/arm/smmuv3.h
@@ -68,6 +68,7 @@ struct SMMUv3State {
     bool accel;
     struct SMMUv3AccelState *s_accel;
     uint64_t msi_gpa;
+    Error *migration_blocker;
 };
 
 typedef enum {