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-rw-r--r--hw/vfio/migration-multifd.c21
-rw-r--r--hw/vfio/pci.c9
2 files changed, 28 insertions, 2 deletions
diff --git a/hw/vfio/migration-multifd.c b/hw/vfio/migration-multifd.c
index e539befaa9..d522671b8d 100644
--- a/hw/vfio/migration-multifd.c
+++ b/hw/vfio/migration-multifd.c
@@ -72,6 +72,7 @@ typedef struct VFIOMultifd {
     QemuMutex load_bufs_mutex; /* Lock order: this lock -> BQL */
     uint32_t load_buf_idx;
     uint32_t load_buf_idx_last;
+    size_t load_buf_queued_pending_buffers_size;
 } VFIOMultifd;
 
 static void vfio_state_buffer_clear(gpointer data)
@@ -128,6 +129,7 @@ static bool vfio_load_state_buffer_insert(VFIODevice *vbasedev,
     VFIOMigration *migration = vbasedev->migration;
     VFIOMultifd *multifd = migration->multifd;
     VFIOStateBuffer *lb;
+    size_t data_size = packet_total_size - sizeof(*packet);
 
     vfio_state_buffers_assert_init(&multifd->load_bufs);
     if (packet->idx >= vfio_state_buffers_size_get(&multifd->load_bufs)) {
@@ -143,8 +145,19 @@ static bool vfio_load_state_buffer_insert(VFIODevice *vbasedev,
 
     assert(packet->idx >= multifd->load_buf_idx);
 
-    lb->data = g_memdup2(&packet->data, packet_total_size - sizeof(*packet));
-    lb->len = packet_total_size - sizeof(*packet);
+    multifd->load_buf_queued_pending_buffers_size += data_size;
+    if (multifd->load_buf_queued_pending_buffers_size >
+        vbasedev->migration_max_queued_buffers_size) {
+        error_setg(errp,
+                   "%s: queuing state buffer %" PRIu32
+                   " would exceed the size max of %" PRIu64,
+                   vbasedev->name, packet->idx,
+                   vbasedev->migration_max_queued_buffers_size);
+        return false;
+    }
+
+    lb->data = g_memdup2(&packet->data, data_size);
+    lb->len = data_size;
     lb->is_present = true;
 
     return true;
@@ -328,6 +341,9 @@ static bool vfio_load_state_buffer_write(VFIODevice *vbasedev,
         assert(wr_ret <= buf_len);
         buf_len -= wr_ret;
         buf_cur += wr_ret;
+
+        assert(multifd->load_buf_queued_pending_buffers_size >= wr_ret);
+        multifd->load_buf_queued_pending_buffers_size -= wr_ret;
     }
 
     trace_vfio_load_state_device_buffer_load_end(vbasedev->name,
@@ -497,6 +513,7 @@ static VFIOMultifd *vfio_multifd_new(void)
 
     multifd->load_buf_idx = 0;
     multifd->load_buf_idx_last = UINT32_MAX;
+    multifd->load_buf_queued_pending_buffers_size = 0;
     qemu_cond_init(&multifd->load_bufs_buffer_ready_cond);
 
     multifd->load_bufs_iter_done = false;
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 09acad002a..be05002b98 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3645,6 +3645,8 @@ static const Property vfio_pci_dev_properties[] = {
     DEFINE_PROP_ON_OFF_AUTO("x-migration-load-config-after-iter", VFIOPCIDevice,
                             vbasedev.migration_load_config_after_iter,
                             ON_OFF_AUTO_AUTO),
+    DEFINE_PROP_SIZE("x-migration-max-queued-buffers-size", VFIOPCIDevice,
+                     vbasedev.migration_max_queued_buffers_size, UINT64_MAX),
     DEFINE_PROP_BOOL("migration-events", VFIOPCIDevice,
                      vbasedev.migration_events, false),
     DEFINE_PROP_BOOL("x-no-mmap", VFIOPCIDevice, vbasedev.no_mmap, false),
@@ -3828,6 +3830,13 @@ static void vfio_pci_dev_class_init(ObjectClass *klass, const void *data)
                                           "non-iterables loading phase) when "
                                           "doing live migration of device state "
                                           "via multifd channels");
+    object_class_property_set_description(klass, /* 10.1 */
+                                          "x-migration-max-queued-buffers-size",
+                                          "Maximum size of in-flight VFIO "
+                                          "device state buffers queued at the "
+                                          "destination when doing live "
+                                          "migration of device state via "
+                                          "multifd channels");
 }
 
 static const TypeInfo vfio_pci_dev_info = {