From: Dan Williams <dan.j.williams@intel.com>
To: Haggai Eran <haggaie@mellanox.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
sbates@raithin.com, "Raj, Ashok <ashok.raj@intel.com>,
linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
linux-rdma@vger.kernel.org, David Woodhouse <dwmw2@infradead.org>,
Jonathan Corbet <corbet@lwn.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
jim.macdonald@everspin.com, Stephen Bates <sbates@raithlin.com>,
linux-block@vger.kernel.org, Linux MM <linux-mm@kvack.org>,
Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
Date: Wed, 26 Oct 2016 06:39:05 -0700 [thread overview]
Message-ID: <CAPcyv4h9Ubgiv1B8FPqes-zUXMckzfEi6uqtfc4GrLc_8BeSLg@mail.gmail.com> (raw)
In-Reply-To: <a5418089-2615-8c04-aca8-50ceb43978f1@mellanox.com>
On Wed, Oct 26, 2016 at 1:24 AM, Haggai Eran <haggaie@mellanox.com> wrote:
[..]
>> I wonder if we could (ab)use a
>> software-defined 'pasid' as the requester id for a peer-to-peer
>> mapping that needs address translation.
> Why would you need that? Isn't it enough to map the peer-to-peer
> addresses correctly in the iommu driver?
>
You're right, we might already have enough...
We would just need to audit iommu drivers to undo any assumptions that
the page being mapped is always in host memory and apply any bus
address translations between source device and target device.
_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Haggai Eran <haggaie@mellanox.com>
Cc: Stephen Bates <sbates@raithlin.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
linux-rdma@vger.kernel.org, linux-block@vger.kernel.org,
Linux MM <linux-mm@kvack.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Matthew Wilcox <willy@linux.intel.com>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Christoph Hellwig <hch@infradead.org>, Jens Axboe <axboe@fb.com>,
Jonathan Corbet <corbet@lwn.net>,
jim.macdonald@everspin.com, sbates@raithin.com,
Logan Gunthorpe <logang@deltatee.com>,
David Woodhouse <dwmw2@infradead.org>,
"Raj, Ashok" <ashok.raj@intel.com>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
Date: Wed, 26 Oct 2016 06:39:05 -0700 [thread overview]
Message-ID: <CAPcyv4h9Ubgiv1B8FPqes-zUXMckzfEi6uqtfc4GrLc_8BeSLg@mail.gmail.com> (raw)
In-Reply-To: <a5418089-2615-8c04-aca8-50ceb43978f1@mellanox.com>
On Wed, Oct 26, 2016 at 1:24 AM, Haggai Eran <haggaie@mellanox.com> wrote:
[..]
>> I wonder if we could (ab)use a
>> software-defined 'pasid' as the requester id for a peer-to-peer
>> mapping that needs address translation.
> Why would you need that? Isn't it enough to map the peer-to-peer
> addresses correctly in the iommu driver?
>
You're right, we might already have enough...
We would just need to audit iommu drivers to undo any assumptions that
the page being mapped is always in host memory and apply any bus
address translations between source device and target device.
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>,
sbates-Rgftl6RXld5BDgjK7y7TUQ@public.gmane.org, "Raj,
Ashok" <ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org"
<linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
jim.macdonald-FgSLVYC75IpWk0Htik3J/w@public.gmane.org,
Stephen Bates <sbates-pv7U853sEMVWk0Htik3J/w@public.gmane.org>,
linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linux MM <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
Jens Axboe <axboe-b10kYP2dOMg@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
Date: Wed, 26 Oct 2016 06:39:05 -0700 [thread overview]
Message-ID: <CAPcyv4h9Ubgiv1B8FPqes-zUXMckzfEi6uqtfc4GrLc_8BeSLg@mail.gmail.com> (raw)
In-Reply-To: <a5418089-2615-8c04-aca8-50ceb43978f1-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
On Wed, Oct 26, 2016 at 1:24 AM, Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> wrote:
[..]
>> I wonder if we could (ab)use a
>> software-defined 'pasid' as the requester id for a peer-to-peer
>> mapping that needs address translation.
> Why would you need that? Isn't it enough to map the peer-to-peer
> addresses correctly in the iommu driver?
>
You're right, we might already have enough...
We would just need to audit iommu drivers to undo any assumptions that
the page being mapped is always in host memory and apply any bus
address translations between source device and target device.
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Haggai Eran <haggaie@mellanox.com>
Cc: Stephen Bates <sbates@raithlin.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
linux-rdma@vger.kernel.org, linux-block@vger.kernel.org,
Linux MM <linux-mm@kvack.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Matthew Wilcox <willy@linux.intel.com>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Christoph Hellwig <hch@infradead.org>, Jens Axboe <axboe@fb.com>,
Jonathan Corbet <corbet@lwn.net>,
jim.macdonald@everspin.com, sbates@raithin.com,
Logan Gunthorpe <logang@deltatee.com>,
David Woodhouse <dwmw2@infradead.org>,
"Raj, Ashok" <ashok.raj@intel.com>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
Date: Wed, 26 Oct 2016 06:39:05 -0700 [thread overview]
Message-ID: <CAPcyv4h9Ubgiv1B8FPqes-zUXMckzfEi6uqtfc4GrLc_8BeSLg@mail.gmail.com> (raw)
In-Reply-To: <a5418089-2615-8c04-aca8-50ceb43978f1@mellanox.com>
On Wed, Oct 26, 2016 at 1:24 AM, Haggai Eran <haggaie@mellanox.com> wrote:
[..]
>> I wonder if we could (ab)use a
>> software-defined 'pasid' as the requester id for a peer-to-peer
>> mapping that needs address translation.
> Why would you need that? Isn't it enough to map the peer-to-peer
> addresses correctly in the iommu driver?
>
You're right, we might already have enough...
We would just need to audit iommu drivers to undo any assumptions that
the page being mapped is always in host memory and apply any bus
address translations between source device and target device.
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Haggai Eran <haggaie@mellanox.com>
Cc: Stephen Bates <sbates@raithlin.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
linux-rdma@vger.kernel.org, linux-block@vger.kernel.org,
Linux MM <linux-mm@kvack.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Matthew Wilcox <willy@linux.intel.com>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Christoph Hellwig <hch@infradead.org>, Jens Axboe <axboe@fb.com>,
Jonathan Corbet <corbet@lwn.net>,
jim.macdonald@everspin.com, sbates@raithin.com,
Logan Gunthorpe <logang@deltatee.com>,
David Woodhouse <dwmw2@infradead.org>,
"Raj, Ashok" <ashok.raj@intel.com>
Subject: Re: [PATCH 0/3] iopmem : A block device for PCIe memory
Date: Wed, 26 Oct 2016 06:39:05 -0700 [thread overview]
Message-ID: <CAPcyv4h9Ubgiv1B8FPqes-zUXMckzfEi6uqtfc4GrLc_8BeSLg@mail.gmail.com> (raw)
In-Reply-To: <a5418089-2615-8c04-aca8-50ceb43978f1@mellanox.com>
On Wed, Oct 26, 2016 at 1:24 AM, Haggai Eran <haggaie@mellanox.com> wrote:
[..]
>> I wonder if we could (ab)use a
>> software-defined 'pasid' as the requester id for a peer-to-peer
>> mapping that needs address translation.
> Why would you need that? Isn't it enough to map the peer-to-peer
> addresses correctly in the iommu driver?
>
You're right, we might already have enough...
We would just need to audit iommu drivers to undo any assumptions that
the page being mapped is always in host memory and apply any bus
address translations between source device and target device.
--
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next prev parent reply other threads:[~2016-10-26 13:39 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-18 21:42 [PATCH 0/3] iopmem : A block device for PCIe memory Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` [PATCH 1/3] memremap.c : Add support for ZONE_DEVICE IO memory with struct pages Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-19 17:50 ` Dan Williams
2016-10-19 17:50 ` Dan Williams
2016-10-19 17:50 ` Dan Williams
2016-10-19 17:50 ` Dan Williams
2016-10-19 17:50 ` Dan Williams
2016-10-19 18:40 ` Stephen Bates
2016-10-19 18:40 ` Stephen Bates
2016-10-19 18:40 ` Stephen Bates
2016-10-19 20:01 ` Dan Williams
2016-10-19 20:01 ` Dan Williams
2016-10-19 20:01 ` Dan Williams
2016-10-19 20:01 ` Dan Williams
2016-10-19 20:01 ` Dan Williams
2016-10-25 11:54 ` Stephen Bates
2016-10-25 11:54 ` Stephen Bates
2016-10-25 11:54 ` Stephen Bates
2016-10-25 11:54 ` Stephen Bates
2016-10-18 21:42 ` [PATCH 2/3] iopmem : Add a block device driver for PCIe attached IO memory Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
[not found] ` <1476826937-20665-3-git-send-email-sbates-pv7U853sEMVWk0Htik3J/w@public.gmane.org>
2016-10-28 6:45 ` Christoph Hellwig
2016-10-28 6:45 ` Christoph Hellwig
2016-10-28 6:45 ` Christoph Hellwig
[not found] ` <20161028064556.GA3231-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-10-28 19:22 ` Logan Gunthorpe
2016-10-28 19:22 ` Logan Gunthorpe
2016-10-28 19:22 ` Logan Gunthorpe
2016-10-18 21:42 ` [PATCH 3/3] iopmem : Add documentation for iopmem driver Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
2016-10-18 21:42 ` Stephen Bates
[not found] ` <1476826937-20665-4-git-send-email-sbates-pv7U853sEMVWk0Htik3J/w@public.gmane.org>
2016-10-28 6:46 ` Christoph Hellwig
2016-10-28 6:46 ` Christoph Hellwig
2016-10-28 6:46 ` Christoph Hellwig
2016-10-19 3:51 ` [PATCH 0/3] iopmem : A block device for PCIe memory Dan Williams
2016-10-19 3:51 ` Dan Williams
2016-10-19 3:51 ` Dan Williams
2016-10-19 3:51 ` Dan Williams
2016-10-19 18:48 ` Stephen Bates
2016-10-19 18:48 ` Stephen Bates
2016-10-19 18:48 ` Stephen Bates
2016-10-19 18:48 ` Stephen Bates
2016-10-19 19:58 ` Dan Williams
2016-10-19 19:58 ` Dan Williams
2016-10-19 19:58 ` Dan Williams
2016-10-19 19:58 ` Dan Williams
2016-10-19 22:54 ` Stephen Bates
2016-10-19 22:54 ` Stephen Bates
2016-10-19 22:54 ` Stephen Bates
2016-10-19 22:54 ` Stephen Bates
2016-10-20 23:22 ` Dave Chinner
2016-10-20 23:22 ` Dave Chinner
2016-10-20 23:22 ` Dave Chinner
2016-10-20 23:22 ` Dave Chinner
2016-10-21 9:57 ` Christoph Hellwig
2016-10-21 9:57 ` Christoph Hellwig
2016-10-21 9:57 ` Christoph Hellwig
2016-10-21 11:12 ` Dave Chinner
2016-10-21 11:12 ` Dave Chinner
2016-10-21 11:12 ` Dave Chinner
2016-10-25 11:50 ` Stephen Bates
2016-10-25 11:50 ` Stephen Bates
2016-10-25 11:50 ` Stephen Bates
2016-10-25 21:19 ` Dave Chinner
2016-10-25 21:19 ` Dave Chinner
2016-10-25 21:19 ` Dave Chinner
2016-11-06 14:05 ` Stephen Bates
2016-11-06 14:05 ` Stephen Bates
2016-11-06 14:05 ` Stephen Bates
2016-11-06 14:05 ` Stephen Bates
2016-10-27 10:22 ` Sagi Grimberg
2016-10-27 10:22 ` Sagi Grimberg
2016-10-27 10:22 ` Sagi Grimberg
2016-10-27 12:32 ` Christoph Hellwig
2016-10-27 12:32 ` Christoph Hellwig
2016-10-27 12:32 ` Christoph Hellwig
2016-10-27 12:32 ` Christoph Hellwig
2016-10-26 8:24 ` Haggai Eran
2016-10-26 8:24 ` Haggai Eran
2016-10-26 8:24 ` Haggai Eran
2016-10-26 8:24 ` Haggai Eran
2016-10-26 8:24 ` Haggai Eran
2016-10-26 13:39 ` Dan Williams [this message]
2016-10-26 13:39 ` Dan Williams
2016-10-26 13:39 ` Dan Williams
2016-10-26 13:39 ` Dan Williams
2016-10-26 13:39 ` Dan Williams
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