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[v2,0/3] Improve automatic selection of IOVA mode

Message ID 1560505157-9769-1-git-send-email-david.marchand@redhat.com (mailing list archive)
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David Marchand June 14, 2019, 9:39 a.m. UTC 
  In SPDK, not all drivers are registered with DPDK at start up time.
Previously, that meant DPDK always chose to set itself up in IOVA_PA
mode. Instead, when the correct iova choice is unclear based on the
devices and drivers known to DPDK at start up time, use other heuristics
(such as whether /proc/self/pagemap is accessible) to make a better
choice.

This enables SPDK to run as an unprivileged user again without requiring
users to explicitly set the iova mode on the command line.


Changelog since v1:
- I took over the series following experiments and discussions with Ben
  and others, squashed Ben patches as two patches focusing on the main
  issues,
- introduced a fix on KNI,
- on the EAL bits,

  - added log on which IOVA mode has been selected,
  - updated BSD EAL,
  - in Linux EAL, moved KNI special case after IOVA selection,
  - in Linux EAL, added check on forced mode wrt physical addresses
    availability,

- on the PCI bus driver bits,

  - enforced the checks in the common code of the PCI bus,
  - added debug logs to track why a iova mode has been chosen per device,
  - added BSD part,
  - in Linux part, checked that VFIO is enabled,
  - in Linux part, defaulted to DC if a driver supports both PA and VA,