diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h
index 6517c39295..ccef514023 100644
--- a/include/sysemu/block-backend-io.h
+++ b/include/sysemu/block-backend-io.h
@@ -72,7 +72,6 @@ void blk_error_action(BlockBackend *blk, BlockErrorAction action,
 void blk_iostatus_set_err(BlockBackend *blk, int error);
 int blk_get_max_iov(BlockBackend *blk);
 int blk_get_max_hw_iov(BlockBackend *blk);
-void blk_set_guest_block_size(BlockBackend *blk, int align);
 
 void blk_io_plug(BlockBackend *blk);
 void blk_io_unplug(BlockBackend *blk);
diff --git a/block/block-backend.c b/block/block-backend.c
index e0e1aff4b1..d4abdf8faa 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -56,9 +56,6 @@ struct BlockBackend {
     const BlockDevOps *dev_ops;
     void *dev_opaque;
 
-    /* the block size for which the guest device expects atomicity */
-    int guest_block_size;
-
     /* If the BDS tree is removed, some of its options are stored here (which
      * can be used to restore those options in the new BDS on insert) */
     BlockBackendRootState root_state;
@@ -998,7 +995,6 @@ void blk_detach_dev(BlockBackend *blk, DeviceState *dev)
     blk->dev = NULL;
     blk->dev_ops = NULL;
     blk->dev_opaque = NULL;
-    blk->guest_block_size = 512;
     blk_set_perm(blk, 0, BLK_PERM_ALL, &error_abort);
     blk_unref(blk);
 }
@@ -2100,12 +2096,6 @@ int blk_get_max_iov(BlockBackend *blk)
     return blk->root->bs->bl.max_iov;
 }
 
-void blk_set_guest_block_size(BlockBackend *blk, int align)
-{
-    IO_CODE();
-    blk->guest_block_size = align;
-}
-
 void *blk_try_blockalign(BlockBackend *blk, size_t size)
 {
     IO_CODE();
diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user-blk-server.c
index a129204c44..b2e458ade3 100644
--- a/block/export/vhost-user-blk-server.c
+++ b/block/export/vhost-user-blk-server.c
@@ -495,7 +495,6 @@ static int vu_blk_exp_create(BlockExport *exp, BlockExportOptions *opts,
         return -EINVAL;
     }
     vexp->blk_size = logical_block_size;
-    blk_set_guest_block_size(exp->blk, logical_block_size);
 
     if (vu_opts->has_num_queues) {
         num_queues = vu_opts->num_queues;
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index cd804795c6..e9ba752f6b 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -1228,7 +1228,6 @@ static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
 
     s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
     blk_set_dev_ops(s->blk, &virtio_block_ops, s);
-    blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size);
 
     blk_iostatus_enable(s->blk);
 
diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
index 674953f1ad..345b284d70 100644
--- a/hw/block/xen-block.c
+++ b/hw/block/xen-block.c
@@ -243,7 +243,6 @@ static void xen_block_realize(XenDevice *xendev, Error **errp)
     }
 
     blk_set_dev_ops(blk, &xen_block_dev_ops, blockdev);
-    blk_set_guest_block_size(blk, conf->logical_block_size);
 
     if (conf->discard_granularity == -1) {
         conf->discard_granularity = conf->physical_block_size;
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 3a5afff5d7..f7ec68513f 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -2544,7 +2544,6 @@ int ide_init_drive(IDEState *s, BlockBackend *blk, IDEDriveKind kind,
     s->smart_selftest_count = 0;
     if (kind == IDE_CD) {
         blk_set_dev_ops(blk, &ide_cd_block_ops, s);
-        blk_set_guest_block_size(blk, 2048);
     } else {
         if (!blk_is_inserted(s->blk)) {
             error_setg(errp, "Device needs media, but drive is empty");
diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 072686ed58..91acb5c0ce 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -2419,7 +2419,6 @@ static void scsi_realize(SCSIDevice *dev, Error **errp)
     } else {
         blk_set_dev_ops(s->qdev.conf.blk, &scsi_disk_block_ops, s);
     }
-    blk_set_guest_block_size(s->qdev.conf.blk, s->qdev.blocksize);
 
     blk_iostatus_enable(s->qdev.conf.blk);
 
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 0ab00ef85c..ada24d7486 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -321,7 +321,6 @@ static void scsi_read_complete(void * opaque, int ret)
         s->blocksize = ldl_be_p(&r->buf[8]);
         s->max_lba = ldq_be_p(&r->buf[0]);
     }
-    blk_set_guest_block_size(s->conf.blk, s->blocksize);
 
     /*
      * Patch MODE SENSE device specific parameters if the BDS is opened
