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Phil's block/nvme.c ENOSPC fix for newer Linux kernels that return this errno.
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Merge remote-tracking branch 'remotes/stefanha-gitlab/tags/block-pull-request' into staging

Pull request

Phil's block/nvme.c ENOSPC fix for newer Linux kernels that return this errno.

# gpg: Signature made Mon 26 Jul 2021 09:53:01 BST
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha-gitlab/tags/block-pull-request:
  block/nvme: Fix VFIO_MAP_DMA failed: No space left on device

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2021-07-26 19:19:36 +01:00
parent 1d6f147f04 15a730e7a3
commit 76bf66b913
1 changed files with 22 additions and 0 deletions
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22
block/nvme.c
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@ -1030,7 +1030,29 @@ try_map:
r = qemu_vfio_dma_map(s->vfio,
qiov->iov[i].iov_base,
len, true, &iova);
if (r == -ENOSPC) {
/*
* In addition to the -ENOMEM error, the VFIO_IOMMU_MAP_DMA
* ioctl returns -ENOSPC to signal the user exhausted the DMA
* mappings available for a container since Linux kernel commit
* 492855939bdb ("vfio/type1: Limit DMA mappings per container",
* April 2019, see CVE-2019-3882).
*
* This block driver already handles this error path by checking
* for the -ENOMEM error, so we directly replace -ENOSPC by
* -ENOMEM. Beside, -ENOSPC has a specific meaning for blockdev
* coroutines: it triggers BLOCKDEV_ON_ERROR_ENOSPC and
* BLOCK_ERROR_ACTION_STOP which stops the VM, asking the operator
* to add more storage to the blockdev. Not something we can do
* easily with an IOMMU :)
*/
r = -ENOMEM;
}
if (r == -ENOMEM && retry) {
/*
* We exhausted the DMA mappings available for our container:
* recycle the volatile IOVA mappings.
*/
retry = false;
trace_nvme_dma_flush_queue_wait(s);
if (s->dma_map_count) {