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Message-Id: <20190130164007.26497-6-joro@8bytes.org>
Date: Wed, 30 Jan 2019 17:40:07 +0100
From: Joerg Roedel <joro@...tes.org>
To: "Michael S . Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Christoph Hellwig <hch@....de>
Cc: Jens Axboe <axboe@...nel.dk>,
virtualization@...ts.linux-foundation.org,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
iommu@...ts.linux-foundation.org, jfehlig@...e.com,
jon.grimm@....com, brijesh.singh@....com, joro@...tes.org,
jroedel@...e.de, Thomas.Lendacky@....com
Subject: [PATCH 5/5] virtio-blk: Consider virtio_max_dma_size() for maximum segment size
From: Joerg Roedel <jroedel@...e.de>
Segments can't be larger than the maximum DMA mapping size
supported on the platform. Take that into account when
setting the maximum segment size for a block device.
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
drivers/block/virtio_blk.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b16a887bbd02..4bc083b7c9b5 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -723,7 +723,7 @@ static int virtblk_probe(struct virtio_device *vdev)
struct request_queue *q;
int err, index;
- u32 v, blk_size, sg_elems, opt_io_size;
+ u32 v, blk_size, max_size, sg_elems, opt_io_size;
u16 min_io_size;
u8 physical_block_exp, alignment_offset;
@@ -826,14 +826,16 @@ static int virtblk_probe(struct virtio_device *vdev)
/* No real sector limit. */
blk_queue_max_hw_sectors(q, -1U);
+ max_size = virtio_max_dma_size(vdev);
+
/* Host can optionally specify maximum segment size and number of
* segments. */
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
struct virtio_blk_config, size_max, &v);
if (!err)
- blk_queue_max_segment_size(q, v);
- else
- blk_queue_max_segment_size(q, -1U);
+ max_size = min(max_size, v);
+
+ blk_queue_max_segment_size(q, max_size);
/* Host can optionally specify the block size of the device */
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
--
2.17.1
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