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In-Reply-To: <61fe76fd-beb8-6074-32e1-16b47170a6ef@intel.com>
From: David Marchand <david.marchand@redhat.com>
Date: Thu, 25 Jul 2019 11:35:25 +0200
Message-ID: <CAJFAV8zhJK++=TJr_AxZ1Nd5-tyv8yoevserSfKoLKydMVC4xg@mail.gmail.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: dev <dev@dpdk.org>, Jerin Jacob Kollanukkaran <jerinj@marvell.com>, 
 Thomas Monjalon <thomas@monjalon.net>
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Subject: Re: [dpdk-dev] [PATCH] eal: pick IOVA as PA if IOMMU is not
	available
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On Thu, Jul 25, 2019 at 11:31 AM Burakov, Anatoly
<anatoly.burakov@intel.com> wrote:
>
> On 25-Jul-19 9:05 AM, David Marchand wrote:
> > On Wed, Jul 24, 2019 at 6:46 PM Anatoly Burakov
> > <anatoly.burakov@intel.com> wrote:
> >>
> >> When IOMMU is not available, /sys/kernel/iommu_groups will not be
> >> populated. This is happening since at least 3.6 when VFIO support
> >> was added. If the directory is empty, EAL should not pick IOVA as
> >> VA as the default IOVA mode.
> >>
> >> We also assume that VFIO equals IOMMU, so if VFIO support is not
> >> compiled, we always assume IOMMU support is not available.
> >
> > Not sure I agree with this statement.
> > What about unknown (from eal pov) kernel drivers?
>
> Are there any cases where we can use IOVA as VA mode without having VFIO
> compiled?

If a pmd relies on a kernel driver we don't know in EAL.
This is not the case afaik, but I'd prefer we don't mix vfio and iommu.


-- 
David Marchand