linux-kernel - Re: refactor the i915 GVT support

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Message-ID: <20210928150507.GM964074@nvidia.com>
Date:   Tue, 28 Sep 2021 12:05:07 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Wang, Zhi A" <zhi.a.wang@...el.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        "De Marchi, Lucas" <lucas.demarchi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Christoph Hellwig <hch@....de>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Nikula, Jani" <jani.nikula@...el.com>
Subject: Re: refactor the i915 GVT support

On Tue, Sep 28, 2021 at 02:35:06PM +0000, Wang, Zhi A wrote:

> Yes. I was thinking of the possibility of putting off some work later so 
> that we don't need to make a lot of changes. GVT-g needs to take a 
> snapshot of GPU registers as the initial virtual states for other vGPUs, 
> which requires the initialization happens at a certain early time of 
> initialization of i915. I was thinking maybe we can take other patches 
> from Christoph like "de-virtualize*" except this one because currently 
> we have to maintain a TEST-ONLY patch on our tree to prevent i915 built 
> as kernel module.

How about just capture these registers in the main module/device and
not try so hard to isolate it to the gvt stuff?

Jason