From: Vincent JARDIN <vincent.jardin@6wind.com>
To: dev@dpdk.org, Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [dpdk-dev] VFIO no-iommu
Date: Fri, 11 Dec 2015 23:12:32 +0100 [thread overview]
Message-ID: <566B4A50.9090607@6wind.com> (raw)
In-Reply-To: <60420822.AbcfvjLZCk@xps13>
Thanks Thomas for putting back this topic.
Alex,
I'd like to hear more about the impacts of "unsupported":
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=033291eccbdb1b70ffc02641edae19ac825dc75d
Use of this mode, specifically binding a device without a native
IOMMU group to a VFIO bus driver will taint the kernel and should
therefore not be considered supported.
It means that we get ride of uio; so it is a nice code cleanup: but why
would VFIO/NO IOMMU be better if the bottomline is "unsupported"?
Thank you,
Vincent
On 11/12/2015 17:28, Thomas Monjalon wrote:
> Recently there were some discussions to have an upstream replacement
> for our igb_uio module.
> Several solutions were discussed (new uio driver, uio_pci_generic, vfio):
> https://lkml.org/lkml/2015/10/16/700
>
> Alex Williamson (maintainer of VFIO driver), submitted a solution
> and was waiting some feedback. Unfortunately, nobody caught it and
> he has reverted his work:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ae5515d
>
> It is an important challenge to remove our out-of-tree modules and
> especially igb_uio. It is a long way to have a standard solution integrated
> in every distributions.
> The current cooking Linux kernel is 4.4 and will have a long term maintenance:
> https://kernel.org/releases.html
> So it is a pity to miss this opportunity.
>
> Stephen has fixed a bug to use the IOMMU group zero:
> http://dpdk.org/browse/dpdk/commit/?id=22215f141b1
>
> Is there someone interested to work on VFIO no-iommu and provide
> some feedbacks?
> We also need to prepare a documentation patch to explain its usage
> compared to the standard VFIO mode.
>
> Thanks
>
next prev parent reply other threads:[~2015-12-11 22:12 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-11 16:28 Thomas Monjalon
2015-12-11 22:12 ` Vincent JARDIN [this message]
2015-12-11 23:02 ` Alex Williamson
2015-12-15 13:43 ` O'Driscoll, Tim
2015-12-15 16:53 ` Alex Williamson
2015-12-16 4:04 ` Ferruh Yigit
2015-12-16 4:38 ` Alex Williamson
2015-12-16 8:35 ` Burakov, Anatoly
2015-12-16 16:23 ` Burakov, Anatoly
2015-12-16 23:17 ` Thomas Monjalon
2015-12-17 9:52 ` Burakov, Anatoly
2015-12-17 10:09 ` Thomas Monjalon
2015-12-17 19:38 ` Jan Viktorin
2015-12-17 21:16 ` Vincent JARDIN
2015-12-17 23:29 ` Stephen Hemminger
2015-12-16 17:11 ` Alex Williamson
2015-12-16 17:22 ` Burakov, Anatoly
2015-12-17 16:43 ` Alex Williamson
2015-12-18 10:43 ` Yigit, Ferruh
2015-12-18 14:38 ` Alex Williamson
2015-12-18 21:50 ` Alex Williamson
2015-12-21 11:46 ` Yigit, Ferruh
2015-12-21 12:18 ` [dpdk-dev] [PATCH] vfio: add no-iommu support Ferruh Yigit
2015-12-21 15:15 ` Burakov, Anatoly
2015-12-21 15:26 ` Yigit, Ferruh
2015-12-21 15:28 ` Burakov, Anatoly
2015-12-21 19:22 ` [dpdk-dev] VFIO no-iommu Alex Williamson
2015-12-22 20:20 ` Alex Williamson
2015-12-23 11:19 ` Burakov, Anatoly
2015-12-31 14:30 ` Santosh Shukla
2016-01-14 6:03 ` Jike Song
2016-01-14 6:52 ` Alex Williamson
2016-01-14 8:12 ` Jike Song
2015-12-11 23:20 ` Jan Viktorin
2015-12-15 11:20 ` Alejandro Lucero
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