linux-kernel - RE: [PATCH v8 1/1] vfio/nvgpu: Add vfio pci variant module for grace hopper

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Date:   Mon, 11 Sep 2023 08:24:16 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Ankit Agrawal <ankita@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Yishai Hadas <yishaih@...dia.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.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>,
        "Currid, Andy" <acurrid@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <danw@...dia.com>,
        "Anuj Aggarwal (SW-GPU)" <anuaggarwal@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v8 1/1] vfio/nvgpu: Add vfio pci variant module for grace
 hopper

> From: Ankit Agrawal <ankita@...dia.com>
> Sent: Monday, September 11, 2023 4:18 PM
> 
> >> I don't see the goal as perfect emulation of the real HW.
> >>
> >> Aiming for minimally disruptive to the ecosystem to support this
> >> quirky pre-CXL HW.
> >>
> >> Perfect emulation would need a unique VFIO uAPI and more complex
> qemu
> >> changes, and it really brings nothing of value.
> >>
> >
> > Does it mean that this requires maintaining a new guest driver
> > different from the existing one on bare metal?
> 
> No, the VM would use the same Nvidia open source driver that is used by the
> bare metal. (https://github.com/NVIDIA/open-gpu-kernel-modules).

because this driver already supports two ways of accessing the aperture:
one via the firmware table, the other using this fake BAR2?