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SubjectRe: [dpdk-dev] [PATCH] vfio: Include No-IOMMU mode
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Hi,

2015-12-02 08:28, Alex Williamson:
> On Mon, 2015-11-16 at 19:12 +0200, Avi Kivity wrote:
> > On 11/16/2015 07:06 PM, Alex Williamson wrote:
> > > FYI, this is now in v4.4-rc1 (the slightly modified v2 version). I want
> > > to give fair warning though that while we seem to agree on this idea, it
> > > hasn't been proven with a userspace driver port. I've opted to include
> > > it in this merge window rather than delaying it until v4.5, but I really
> > > need to see a user for this before the end of the v4.4 cycle or I think
> > > we'll need to revert and revisit for v4.5 anyway. I don't really have
> > > any interest in adding and maintaining code that has no users. Please
> > > keep me informed of progress with a dpdk port. Thanks,
> >
> > Thanks Alex. Copying the dpdk mailing list, where the users live.
> >
> > dpdk-ers: vfio-noiommu is a replacement for uio_pci_generic and
> > uio_igb. It supports MSI-X and so can be used on SR/IOV VF devices.
> > The intent is that you can use dpdk without an external module, using
> > vfio, whether you are on bare metal with an iommu, bare metal without an
> > iommu, or virtualized. However, dpdk needs modification to support this.
>
> Still no users for this that I'm aware of. I'm going to revert this in
> rc5 unless something changes. Thanks,

Removing needs for out-of-tree modules is a really nice achievement.
Yes, we (in the DPDK project) should check how to use this no-iommu VFIO
and to replace igb_uio.

I'm sorry we failed to catch your email and follow up.
Is it really too late? What is the risk of keeping it in Linux 4.4?
Advertising a new feature and removing it would be frustrating.

Have you tried this VFIO mode with DPDK?
How complex would be the patch to support it?

Thanks


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