From: Roland Dreier <rolandd@cisco.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, openib-general@openib.org
Subject: Re: [PATCH 12/16] IB uverbs: add mthca user PD support
Date: Wed, 29 Jun 2005 09:06:22 -0700 [thread overview]
Message-ID: <52slz1f8qp.fsf@topspin.com> (raw)
In-Reply-To: 20050628170718.0b2a9cad.akpm@osdl.org
Andrew> What is a userspace protection domain?
A protection domain is an abstraction enforced by IB hardware --
loosely put, every resource (work queue, memory region, etc) in put in
a PD when it is created, and different resources can only see each
other if they belong to the same PD.
As an example, PDs are needed because IB allows unprivileged processes
to directly post requests to work queues. Work requests refer to
memory regions by memory keys (32 bit cookies). Without PDs, a
process could get access to another process's memory region if it
could guess the 32-bit key -- with PDs, it can't because the other
process's memory region will be in a different PD from its work queue.
- R.
next prev parent reply other threads:[~2005-06-29 16:10 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-28 23:03 [PATCH 00/16] Add InfiniBand userspace verbs (direct userspace access) Roland Dreier
2005-06-28 23:03 ` [PATCH 01/16] IB uverbs: core API extensions Roland Dreier
2005-06-28 23:03 ` [PATCH 02/16] IB uverbs: update kernel midlayer for new API Roland Dreier
2005-06-28 23:03 ` [PATCH 03/16] IB uverbs: update mthca " Roland Dreier
2005-06-28 23:03 ` [PATCH 04/16] IB uverbs: add user verbs ABI header Roland Dreier
2005-06-28 23:03 ` [PATCH 05/16] IB uverbs: core implementation Roland Dreier
2005-06-28 23:03 ` [PATCH 06/16] IB uverbs: memory pinning implementation Roland Dreier
2005-06-28 23:03 ` [PATCH 07/16] IB uverbs: hook up Kconfig/Makefile Roland Dreier
2005-06-28 23:03 ` [PATCH 08/16] IB uverbs: add mthca ABI header Roland Dreier
2005-06-28 23:03 ` [PATCH 09/16] IB uverbs: add mthca user doorbell record support Roland Dreier
2005-06-28 23:03 ` [PATCH 10/16] IB uverbs: add mthca user context support Roland Dreier
2005-06-28 23:03 ` [PATCH 11/16] IB uverbs: add mthca mmap support Roland Dreier
2005-06-28 23:03 ` [PATCH 12/16] IB uverbs: add mthca user PD support Roland Dreier
2005-06-28 23:03 ` [PATCH 13/16] IB uverbs: add mthca user MR support Roland Dreier
2005-06-28 23:03 ` [PATCH 14/16] IB uverbs: add mthca user CQ support Roland Dreier
2005-06-28 23:03 ` [PATCH 15/16] IB uverbs: add mthca user QP support Roland Dreier
2005-06-28 23:03 ` [PATCH 16/16] IB uverbs: add documentation file Roland Dreier
2005-06-29 0:10 ` [PATCH 14/16] IB uverbs: add mthca user CQ support Andrew Morton
2005-06-29 16:06 ` Roland Dreier
2005-06-29 0:07 ` [PATCH 12/16] IB uverbs: add mthca user PD support Andrew Morton
2005-06-29 16:06 ` Roland Dreier [this message]
2005-06-29 0:05 ` [PATCH 11/16] IB uverbs: add mthca mmap support Andrew Morton
2005-06-29 16:06 ` Roland Dreier
2005-07-05 19:20 ` Roland Dreier
2005-07-05 20:53 ` Michael S. Tsirkin
2005-07-05 22:07 ` Roland Dreier
2005-06-29 0:02 ` [PATCH 06/16] IB uverbs: memory pinning implementation Andrew Morton
2005-06-29 16:06 ` Roland Dreier
2005-06-29 0:27 ` [PATCH 05/16] IB uverbs: core implementation Greg KH
2005-06-29 1:38 ` [openib-general] " Tom Duffy
2005-06-29 4:13 ` Troy Benjegerdes
2005-06-29 16:12 ` Greg KH
2005-06-29 16:32 ` Troy Benjegerdes
2005-06-29 16:06 ` Roland Dreier
2005-06-29 17:01 ` Roland Dreier
2005-06-29 18:03 ` Greg KH
2005-06-30 3:13 ` [openib-general] " Ronald G. Minnich
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