linux-kernel - Re: [PATCH v7 1/1] vfio/nvgpu: Add vfio pci variant module for grace hopper

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Message-ID: <ZPF7CYel75P3fBY2@infradead.org>
Date:   Thu, 31 Aug 2023 22:47:53 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Ankit Agrawal <ankita@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Yishai Hadas <yishaih@...dia.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        Aniket Agashe <aniketa@...dia.com>, Neo Jia <cjia@...dia.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Tarun Gupta (SW-GPU)" <targupta@...dia.com>,
        Vikram Sethi <vsethi@...dia.com>,
        Andy Currid <acurrid@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <danw@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Airlie <airlied@...hat.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v7 1/1] vfio/nvgpu: Add vfio pci variant module for grace
 hopper

On Thu, Aug 31, 2023 at 12:21:50PM -0600, Alex Williamson wrote:
> There's really never a guarantee that the thing we're exposing via the
> vfio uAPI has mainline drivers, for example we don't consult the
> nouveau device table before we expose an NVIDIA GPU to a Windows guest
> running proprietary device drivers.

As I said in my initial mail there's a huge different between a simple
passthrough like vfio-pci that doesn't care about the actual device,
and a driver like this one that is completely device specific.