linux-kernel - [PATCH 4.19 291/306] virtio_ring: fix return code on DMA mapping fails

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Message-Id: <20191127203136.015950334@linuxfoundation.org>
Date:   Wed, 27 Nov 2019 21:32:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Halil Pasic <pasic@...ux.ibm.com>,
        Michael Mueller <mimu@...ux.ibm.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 291/306] virtio_ring: fix return code on DMA mapping fails

From: Halil Pasic <pasic@...ux.ibm.com>

[ Upstream commit f7728002c1c7bfa787b276a31c3ef458739b8e7c ]

Commit 780bc7903a32 ("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@...r.kernel.org
Fixes: 780bc7903a32 ("virtio_ring: Support DMA APIs")
Signed-off-by: Halil Pasic <pasic@...ux.ibm.com>
Tested-by: Michael Mueller <mimu@...ux.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/virtio/virtio_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 9529e28e18222..6228b48d1e127 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -431,7 +431,7 @@ unmap_release:
 		kfree(desc);

 	END_USE(vq);
-	return -EIO;
+	return -ENOMEM;
 }

 /**
-- 
2.20.1