linux-kernel - Re: [PATCH v2 1/1] s390: virtio: let arch accept devices without IOMMU feature

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Date:   Tue, 16 Jun 2020 14:21:12 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>
Cc:     Christian Borntraeger <borntraeger@...ibm.com>,
        linux-kernel@...r.kernel.org, pasic@...ux.ibm.com,
        frankja@...ux.ibm.com, mst@...hat.com, jasowang@...hat.com,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 1/1] s390: virtio: let arch accept devices without
 IOMMU feature

On Tue, 16 Jun 2020 09:35:19 +0200
Pierre Morel <pmorel@...ux.ibm.com> wrote:

> On 2020-06-16 08:55, Christian Borntraeger wrote:
> > 
> > 
> > On 15.06.20 14:39, Pierre Morel wrote:  
> >> An architecture protecting the guest memory against unauthorized host
> >> access may want to enforce VIRTIO I/O device protection through the
> >> use of VIRTIO_F_IOMMU_PLATFORM.
> >>
> >> Let's give a chance to the architecture to accept or not devices
> >> without VIRTIO_F_IOMMU_PLATFORM.
> >>
> >> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>  
> > 
> > 
> > Acked-by: Christian Borntraeger <borntraeger@...ibm.com>  
> 
> Thanks,
> 
> > 
> > Shouldnt we maybe add a pr_warn if that happens to help the admins to understand what is going on?
> > 
> >   
> 
> Yes, Connie asked for it too, good that you remind it to me, I add it.

Yes, please :)