linux-kernel - Re: refactor the i915 GVT support and move to the modern mdev API v2

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Date:   Tue, 9 Nov 2021 08:59:57 +0100
From:   Christoph Hellwig <hch@....de>
To:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: refactor the i915 GVT support and move to the modern mdev API
 v2

On Thu, Nov 04, 2021 at 02:59:18PM +0200, Joonas Lahtinen wrote:
> The minimal we should do is to eliminate the double underscore
> prefixed functions. But I would prefer to have the symbol exports by
> default so that we can enable the functionality just by loading the
> module.

I'm fine with exporting by default, but just loading won't really work
even with that:

 - there are a bunch of IS_ENABLED conditionals in the i915 (although
   they look like minor optimizations to me).
 - the enable_gvt needs to be set, although after this refactor this
   option is completely pointless and should probably be enabled
 - the enable_guc option needs to be disable for gvt to work.