linux-kernel - Re: [PATCH 8/9] vfio/pci: use x86 naming instead of igd

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Message-ID: <20210208181313.GH4247@nvidia.com>
Date:   Mon, 8 Feb 2021 14:13:13 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alexey Kardashevskiy <aik@...abs.ru>
CC:     Max Gurtovoy <mgurtovoy@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <liranl@...dia.com>,
        <oren@...dia.com>, <tzahio@...dia.com>, <leonro@...dia.com>,
        <yarong@...dia.com>, <aviadye@...dia.com>, <shahafs@...dia.com>,
        <artemp@...dia.com>, <kwankhede@...dia.com>, <ACurrid@...dia.com>,
        <gmataev@...dia.com>, <cjia@...dia.com>, <yishaih@...dia.com>
Subject: Re: [PATCH 8/9] vfio/pci: use x86 naming instead of igd

On Fri, Feb 05, 2021 at 11:42:11AM +1100, Alexey Kardashevskiy wrote:
> > A real nvswitch function?
> 
> What do you mean by this exactly? The cpu side of nvlink is "emulated pci
> devices", the gpu side is not in pci space at all, the nvidia driver manages
> it via the gpu's mmio or/and cfg space.

Some versions of the nvswitch chip have a PCI-E link too, that is what
I though this was all about when I first saw it.

So, it is really a special set of functions for NVIDIA GPU device
assignment only applicable to P9 systems, much like IGD is for Intel
on x86.

Jason