Halil Pasic 5d0b56f672 virtio_ring: fix return code on DMA mapping fails ...

[ Upstream commit f7728002c1 ]

Commit 780bc7903a ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2019-12-01 09:17:40 +01:00

..

Kconfig

virtio: make VIRTIO a menuconfig to ease disabling it all

2018-02-01 16:26:43 +02:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

virtio_balloon.c

virtio_balloon: replace oom notifier with shrinker

2018-08-22 00:56:24 +03:00

virtio_input.c

virtio: wrap find_vqs

2017-05-02 23:41:42 +03:00

virtio_mmio.c

virtio: mmio-v1: Validate queue PFN

2018-08-22 00:56:56 +03:00

virtio_pci_common.c

virtio_pci: fix a NULL pointer reference in vp_del_vqs

2019-05-10 17:54:08 +02:00

virtio_pci_common.h

virtio: Make vp_set_vq_affinity() take a mask.

2018-08-11 12:02:18 -07:00

virtio_pci_legacy.c

virtio: pci-legacy: Validate queue pfn

2018-08-22 00:56:58 +03:00

virtio_pci_modern.c

virtio_pci: support enabling VFs

2018-06-12 04:59:29 +03:00

virtio_ring.c

virtio_ring: fix return code on DMA mapping fails

2019-12-01 09:17:40 +01:00

virtio.c

virtio: split device_register into device_initialize and device_add

2018-02-01 16:26:45 +02:00