From: Roland Dreier <rdreier@cisco.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: jackm@mellanox.co.il, Jeremy Fitzhardinge <jeremy@goop.org>,
xen-devel@lists.xensource.com, rdreir@cisco.com,
linux-rdma@vger.kernel.org,
Vivien Bernet-Rollande <vbr@soprive.net>,
sean.hefty@intel.com
Subject: Re: Re: [PATCH] infiniband/mthca : Fix userland mapping of mthca infiniband cards in Xen dom0
Date: Thu, 06 Jan 2011 10:51:57 -0800 [thread overview]
Message-ID: <adalj2xdfw2.fsf@cisco.com> (raw)
In-Reply-To: <20110106165549.GC18774@dumpdata.com> (Konrad Rzeszutek Wilk's message of "Thu, 6 Jan 2011 11:55:49 -0500")
> There is another way, which I hope can fix this issue (it fixes
> the graphics drivers). Basically making the Xen MMU be aware of the E820
> and consider any access to PFNs that are not in RAM to have VM_IO implicitly set.
>
> The patches are at git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
>
> stable/p2m-identity.v4.3
>
> And posted on LKML )https://lkml.org/lkml/2010/12/30/163)
>
> They _should_ take care of your problem as long as the PFNs you
> are mapping fall within the PCI BAR regions (which I would presume they
> do since you are using ioremap).
Yes, that should work fine for all the cases I know of in the RDMA
drivers. We are just mapping some PCI BAR space into userspace for
direct access to hardware (just like graphics, I think).
I definitely prefer a solution that doesn't require driver authors to
add a Xen-specific fix that isn't required on any other architecture.
- R.
next prev parent reply other threads:[~2011-01-06 18:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-22 16:11 [PATCH] infiniband/mthca : Fix userland mapping of mthca infiniband cards in Xen dom0 Vivien Bernet-Rollande
2011-01-05 19:35 ` Roland Dreier
[not found] ` <adamxnfdty8.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2011-01-06 11:08 ` Vivien Bernet-Rollande
2011-01-06 16:55 ` Konrad Rzeszutek Wilk
2011-01-06 18:51 ` Roland Dreier [this message]
[not found] ` <adalj2xdfw2.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2011-01-07 19:15 ` [Xen-devel] " Konrad Rzeszutek Wilk
[not found] ` <20110107191559.GA27871-Z2dCqgVfyhJWk0Htik3J/w@public.gmane.org>
2011-01-09 8:24 ` Jack Morgenstein
[not found] ` <AANLkTi=zMiVJfTRDeYvbxT46b0iASKG9jPgXqG81bqAK-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-01-06 19:15 ` Roland Dreier
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