Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-IOMMU mode

Michael S. Tsirkin
2024-11-06T18:14:51Z

On Thu, Oct 24, 2024 at 02:05:43AM -0700, Christoph Hellwig wrote:
> On Wed, Oct 23, 2024 at 04:19:02AM -0400, Michael S. Tsirkin wrote:
> > On Tue, Oct 22, 2024 at 11:58:19PM -0700, Christoph Hellwig wrote:
> > > On Sat, Oct 19, 2024 at 08:16:44PM -0400, Michael S. Tsirkin wrote:
> > > > Because people want to move from some vendor specific solution with vfio
> > > > to a standard vdpa compatible one with vdpa.
> > >
> > > So now you have a want for new use cases and you turn that into a must
> > > for supporting completely insecure and dangerous crap.
> >
> > Nope.
> >
> > kernel is tainted -> unsupported
> >
> > whoever supports tainted kernels is already in dangerous waters.
>
> That's not a carte blanche for doing whatever crazy stuff you
> want.
>
> And if you don't trust me I'll add Greg who has a very clear opinion
> on IOMMU-bypassing user I/O hooks in the style of the uio driver as
> well I think :)

As a supporter of one of uio drivers, I agree with him.

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MST