linux-kernel - Re: [RFC] /dev/ioasid uAPI proposal

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Date:   Wed, 30 Jun 2021 08:01:31 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        David Woodhouse <dwmw2@...radead.org>,
        Jason Wang <jasowang@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Robin Murphy <robin.murphy@....com>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [RFC] /dev/ioasid uAPI proposal

On Wed, Jun 09, 2021 at 09:47:42AM -0300, Jason Gunthorpe wrote:
> I can vaugely understand this rational for vfio, but not at all for
> the platform's iommu driver, sorry.

Agreed.  More importantly the dependency is not for the platform iommu
driver but just for the core iommu code, which is always built in if
enabled.