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virtio_ring: fix return code on DMA mapping fails
Commit780bc7903a
("virtio_ring: Support DMA APIs") makes virtqueue_add() return -EIO when we fail to map our I/O buffers. This is a very realistic scenario for guests with encrypted memory, as swiotlb may run out of space, depending on it's size and the I/O load. The virtio-blk driver interprets -EIO form virtqueue_add() as an IO error, despite the fact that swiotlb full is in absence of bugs a recoverable condition. Let us change the return code to -ENOMEM, and make the block layer recover form these failures when virtio-blk encounters the condition described above. Cc: stable@vger.kernel.org Fixes:780bc7903a
("virtio_ring: Support DMA APIs") Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -583,7 +583,7 @@ unmap_release:
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kfree(desc);
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END_USE(vq);
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return -EIO;
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return -ENOMEM;
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}
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static bool virtqueue_kick_prepare_split(struct virtqueue *_vq)
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@ -1085,7 +1085,7 @@ unmap_release:
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kfree(desc);
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END_USE(vq);
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return -EIO;
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return -ENOMEM;
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}
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static inline int virtqueue_add_packed(struct virtqueue *_vq,
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