From: Jike Song <albcamus@gmail.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] VFIO no-iommu
Date: Thu, 14 Jan 2016 14:03:34 +0800 [thread overview]
Message-ID: <CANE52Kj6_10RtP75esvQVnkHOfpR9ekKdCH7uLsEy=LbpwsaYA@mail.gmail.com> (raw)
In-Reply-To: <1450240711.2674.11.camel@redhat.com>
On Wed, Dec 16, 2015 at 12:38 PM, Alex Williamson
<alex.williamson@redhat.com> wrote:
>
> So it works. Is it acceptable? Useful? Sufficiently complete? Does
> it imply deprecating the uio interface? I believe the feature that
> started this discussion was support for MSI/X interrupts so that VFs
> can support some kind of interrupt (uio only supports INTx since it
> doesn't allow DMA). Implementing that would be the ultimate test of
> whether this provides dpdk with not only a more consistent interface,
> but the feature dpdk wants that's missing in uio. Thanks,
>
Hi Alex,
Sorry for jumping in. Just being curious, how does VFIO No-IOMMU mode
support DMA from userspace drivers? If I understand correctly, due to
the absence of IOMMU, pcidev has to use physaddr to start a DMA
transaction, but how it is supposed to get physaddr from userspace
drivers, /proc/<pid>/pagemap or something else?
--
Thanks,
Jike
next prev parent reply other threads:[~2016-01-14 6:03 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
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 [this message]
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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