RDMA/irdma: Add support for revocable pinned dmabuf import

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Use the new API to support importing pinned dmabufs from exporters
that require revocation, such as VFIO. The revoke semantic is
achieved by issuing a HW invalidation command but not freeing
the key. This prevents further accesses to the region (they will
result in an invalid key AE), but also keeps the key reserved
until the region is actually deregistered (i.e., ibv_dereg_mr)
so that a new MR registration cannot acquire the same key.

Tested with lockdep+kasan and a memfd backed dmabuf.

The rereg_mr path is explicitly blocked in libibverbs for dmabuf MRs
(more specifically, any MR not of type IBV_MR_TYPE_MR), so the rereg_mr
path for dmabufs was tested with a modified libibverbs.

Signed-off-by: Jacob Moroni <jmoroni@google.com>
Link: https://patch.msgid.link/20260305170826.3803155-6-jmoroni@google.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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Jacob Moroni 2026-03-05 17:08:26 +00:00 • committed by Leon Romanovsky

parent 3a0b171302

commit 4707bf5f6c

1 changed files with 93 additions and 12 deletions

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105

drivers/infiniband/hw/irdma/verbs.c

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