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

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Message-ID: <20210604121337.GJ1002214@nvidia.com>
Date:   Fri, 4 Jun 2021 09:13:37 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Robin Murphy <robin.murphy@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Kirti Wankhede <kwankhede@...dia.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Jason Wang <jasowang@...hat.com>
Subject: Re: [RFC] /dev/ioasid uAPI proposal

On Thu, Jun 03, 2021 at 02:41:36PM -0600, Alex Williamson wrote:

> Could you clarify "vfio_driver"?  

This is the thing providing the vfio_device_ops function pointers.

So vfio-pci can't know anything about this (although your no-snoop
control probing idea makes sense to me)

But vfio_mlx5_pci can know

So can mdev_idxd

And kvmgt

Jason