Setting max_segment_size allows more than 64k per sg element, unless the host specified a limit. Setting max_sectors indicates that our max_hw_segments is the only limit. Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx> diff -r 446171198334 drivers/block/virtio_blk.c --- a/drivers/block/virtio_blk.c Mon Nov 17 08:34:57 2008 +1030 +++ b/drivers/block/virtio_blk.c Mon Nov 17 17:16:35 2008 +1030 @@ -277,6 +277,9 @@ } set_capacity(vblk->disk, cap); + /* No real sector limit. */ + blk_queue_max_sectors(vblk->disk->queue, -1U); + /* Host can optionally specify maximum segment size and number of * segments. */ err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, @@ -284,6 +287,8 @@ &v); if (!err) blk_queue_max_segment_size(vblk->disk->queue, v); + else + blk_queue_max_segment_size(vblk->disk->queue, -1UL); err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, offsetof(struct virtio_blk_config, seg_max), _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
