diff -r 1fbb2025b263 sys/cam/nvme/nvme_da.c
--- a/sys/cam/nvme/nvme_da.c	Sun Dec 09 21:53:45 2018 +0000
+++ b/sys/cam/nvme/nvme_da.c	Sun Dec 09 15:18:08 2018 -0800
@@ -798,7 +798,7 @@
 	disk->d_mediasize = (off_t)(disk->d_sectorsize * nsd->nsze);
 	disk->d_delmaxsize = disk->d_mediasize;
 	disk->d_flags = DISKFLAG_DIRECT_COMPLETION;
-//	if (cd->oncs.dsm) // XXX broken?
+	if ((cd->oncs >> NVME_CTRLR_DATA_ONCS_DSM_SHIFT) & NVME_CTRLR_DATA_ONCS_DSM_MASK)
 		disk->d_flags |= DISKFLAG_CANDELETE;
 	vwc_present = (cd->vwc >> NVME_CTRLR_DATA_VWC_PRESENT_SHIFT) &
 		NVME_CTRLR_DATA_VWC_PRESENT_MASK;