linux-kernel - Re: [PATCH v4 14/32] iommu: introduce iommu_domain_alloc

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Message-ID: <20220314213655.GH11336@nvidia.com>
Date:   Mon, 14 Mar 2022 18:36:55 -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 14/32] iommu: introduce iommu_domain_alloc_type and
 the KVM type

On Mon, Mar 14, 2022 at 03:44:33PM -0400, Matthew Rosato wrote:
> s390x will introduce an additional domain type that is used for
> managing IOMMU owned by KVM.  Define the type here and add an
> interface for allocating a specified type vs the default type.
> 
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
>  drivers/iommu/iommu.c |  7 +++++++
>  include/linux/iommu.h | 12 ++++++++++++
>  2 files changed, 19 insertions(+)

I think the general idea is right, but I'm not keen on this as an
interface at all.

We are trying to build in iommufd a generic interface for an IOMMU
driver to expose IOMMU-device-specific domains such as this in a
general purpose way so all the platforms can get what they need.

Jason