From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH] doc: Clarify IOMMU usage with "uio-pci"
 kernel module
Date: Wed, 5 Sep 2018 10:22:16 +0100
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Cc: Rami Rosen <roszenrami@gmail.com>, "dev@dpdk.org" <dev@dpdk.org>, nd
 <nd@arm.com>
To: "Tone Zhang (Arm Technology China)" <Tone.Zhang@arm.com>
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On Wed, 5 Sep 2018 00:20:29 +0000
"Tone Zhang (Arm Technology China)" <Tone.Zhang@arm.com> wrote:

> Hi Rami,
>=20
> Yes, I mean =E2=80=9Cuio_pci_generic=E2=80=9D kernel module.
>=20
> I will update the change accordingly.
>=20
> Thanks.
>=20
> Br,
> Tone
>=20
> From: Rami Rosen <roszenrami@gmail.com>
> Sent: Wednesday, September 5, 2018 3:55 AM
> To: Tone Zhang (Arm Technology China) <Tone.Zhang@arm.com>
> Cc: dev@dpdk.org; nd <nd@arm.com>
> Subject: Re: [dpdk-dev] [PATCH] doc: Clarify IOMMU usage with "uio-pci" k=
ernel module
>=20
> Hi Tone,
> >if the devices for used DPDK bound to the ``uio-pci`` kernel module, ple=
ase make =20
>=20
> The three kernel modules which can be used for DPDK binding are vfio-pci,=
 uio_pci_generic and igb_uio. Don't you mean here uio_pci_generic ?
>=20
> Regards,
> Rami Rosen
>=20
>=20
> =D7=91=D7=AA=D7=90=D7=A8=D7=99=D7=9A =D7=99=D7=95=D7=9D =D7=92=D7=B3, 4 =
=D7=91=D7=A1=D7=A4=D7=98=D7=B3 2018, 11:59, =D7=9E=D7=90=D7=AA tone.z
> When binding the devices used by DPDK to the "uio-pci" kernel module,
> the IOMMU should be disabled in order not to break the
> because of the virtual / physical address mapping.
>=20
> The patch clarifies the IOMMU configuration on both x86_64 and arm64
> systems.
>=20
> Signed-off-by: tone.zhang <tone.zhang@arm.com<mailto:tone.zhang@arm.com>>
> ---
>  doc/guides/linux_gsg/linux_drivers.rst | 7 +++++++
>  1 file changed, 7 insertions(+)
>=20
> diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gs=
g/linux_drivers.rst
> index 371a817..8f9ec8f 100644
> --- a/doc/guides/linux_gsg/linux_drivers.rst
> +++ b/doc/guides/linux_gsg/linux_drivers.rst
> @@ -48,6 +48,13 @@ be loaded as shown below:
>     ``vfio-pci``
> 2.7.4

Also, it would be good if documentation was clear in recommending using VFIO
instead if IOMMU is present.