scsi-block: Deprecate rotation_rate

This option is added together with scsi-disk but is never honoured,
becuase we don't emulate the VPD page for scsi-block. We could intercept
and inject the user specified value like for max xfer len, but it's
probably not helpful since the intent of 070f8009 was for random
entropy aspects, not for performance. If emulated rotation rate is
desired, scsi-hd is more suitable.
Signed-off-by: NFam Zheng <famz@redhat.com>

Message-Id: <20180917083138.3948-1-famz@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/scsi/scsi-disk.c

@@ -2610,6 +2610,12 @@ static void scsi_block_realize(SCSIDevice *dev, Error **errp)
         return;
     }
 
+    if (s->rotation_rate) {
+        error_report_once("rotation_rate is specified for scsi-block but is "
+                          "not implemented. This option is deprecated and will "
+                          "be removed in a future version");
+    }
+
     /* check we are using a driver managing SG_IO (version 3 and after) */
     rc = blk_ioctl(s->qdev.conf.blk, SG_GET_VERSION_NUM, &sg_version);
     if (rc < 0) {