virtio_blk: Limit use of indirect descriptors
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Authored by andrew on Jun 17 2025, 3:18 PM.

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bryanv
harry.moulton_arm.com

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rGcbc2e34613c4: virtio_blk: Limit use of indirect descriptors

Summary

Pass 0 as the number of indirect descriptors when they are not
supported.

This fixes an issue on the Arm FVP model where we don't negotiate
them, however pass a number of segments greater than
VIRTIO_MAX_INDIRECT. This leads to virtqueue_alloc failing and
virtio_blk failing to attach.

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rG FreeBSD src repository

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Event Timeline

andrew created this revision.Jun 17 2025, 3:18 PM

Herald added a subscriber: imp. · View Herald TranscriptJun 17 2025, 3:18 PM

andrew requested review of this revision.Jun 17 2025, 3:18 PM

Harbormaster completed remote builds in B64944: Diff 157184.Jun 17 2025, 3:18 PM

harry.moulton_arm.com accepted this revision.Jun 19 2025, 11:59 AM

This revision is now accepted and ready to land.Jun 19 2025, 11:59 AM

Closed by commit rGcbc2e34613c4: virtio_blk: Limit use of indirect descriptors (authored by andrew). · Explain WhyJun 23 2025, 1:20 PM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rGcbc2e34613c4: virtio_blk: Limit use of indirect descriptors.

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sys/

dev/

virtio/

block/

virtio_blk.c

6 lines

Diff 157452

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sys/dev/virtio/block/virtio_blk.c

virtio_blk: Limit use of indirect descriptorsClosedPublicActions