linux-kernel - Re: [PATCH v4 15/32] vfio: introduce KVM-owned IOMMU type

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Date:   Tue, 15 Mar 2022 11:38:58 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, alex.williamson@...hat.com,
        cohuck@...hat.com, schnelle@...ux.ibm.com, farman@...ux.ibm.com,
        pmorel@...ux.ibm.com, borntraeger@...ux.ibm.com, hca@...ux.ibm.com,
        gor@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        agordeev@...ux.ibm.com, svens@...ux.ibm.com, frankja@...ux.ibm.com,
        david@...hat.com, imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com,
        pasic@...ux.ibm.com, joro@...tes.org, will@...nel.org,
        pbonzini@...hat.com, corbet@....net, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v4 15/32] vfio: introduce KVM-owned IOMMU type

On Tue, Mar 15, 2022 at 09:49:01AM -0400, Matthew Rosato wrote:

> The rationale for splitting steps 1 and 2 are that VFIO_SET_IOMMU doesn't
> have a mechanism for specifying more than the type as an arg, no?  Otherwise
> yes, you could specify a kvm fd at this point and it would have some other
> advantages (e.g. skip notifier).  But we still can't use the IOMMU for
> mapping until step 3.

Stuff like this is why I'd be much happier if this could join our
iommfd project so we can have clean modeling of the multiple iommu_domains.

Jason