> Could you explain this last part? Why are they used without
> VIRTIO_BLK_F_DISCARD?


Sure,

If both  VIRTIO_BLK_F_DISCARD and VIRTIO_BLK_F_SECURE_ERASE are negotiated:
q->limits.max_discard_segments =
min(virtio_blk_config->max_discard_seg,
virtio_blk_config->max_secure_erase_seg)

If VIRTIO_BLK_F_DISCARD is negotiated and VIRTIO_BLK_F_SECURE_ERASE isn't
q->limits.max_discard_segments = virtio_blk_config->max_discard_seg

If VIRTIO_BLK_F_SECURE_ERASE is negotiated and VIRTIO_BLK_F_DISCARD isn't
q->limits.max_discard_segments = virtio_blk_config->max_secure_erase_seg
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