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

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Message-ID: <ZPrgXAfJvlDLsWqb@infradead.org>
Date:   Fri, 8 Sep 2023 01:50:36 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, ankita@...dia.com,
        yishaih@...dia.com, shameerali.kolothum.thodi@...wei.com,
        kevin.tian@...el.com, aniketa@...dia.com, cjia@...dia.com,
        kwankhede@...dia.com, targupta@...dia.com, vsethi@...dia.com,
        acurrid@...dia.com, apopple@...dia.com, jhubbard@...dia.com,
        danw@...dia.com, anuaggarwal@...dia.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v8 1/1] vfio/nvgpu: Add vfio pci variant module for grace
 hopper

On Thu, Sep 07, 2023 at 10:04:10PM -0600, Alex Williamson wrote:
> > I think it really depends on what the qemu side wants to do..
> 
> Ok, I thought you had been one of the proponents of the fake BAR
> approach as more resembling CXL.  Do we need to reevaluate that the
> tinkering with the VM machine topology and firmware tables would better
> align to a device specific region that QEMU inserts into the VM address
> space so that bare metal and virtual machine versions of this device
> look more similar?  Thanks,

Yes, providing something to a VM that doesn't look anything like the
underlying hardware feels pretty strange.