linux-kernel - Re: [PATCH v4 1/2] i915/gvt: Introduce the mmio_info

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Date:   Tue, 30 Nov 2021 17:46:22 +0100
From:   Christoph Hellwig <hch@....de>
To:     Zhi Wang <zhi.wang.linux@...il.com>
Cc:     intel-gfx@...ts.freedesktop.org,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Jason Gunthorpe <jgg@...dia.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Vivi Rodrigo <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Terrence Xu <terrence.xu@...el.com>
Subject: Re: [PATCH v4 1/2] i915/gvt: Introduce the mmio_info_table.c to
 support VFIO new mdev API

I still think this goes into the wrong direction.

Something closer to your first version that also saves away the
gvt->mmio.mmio_attribute flags in the core i915 module, and which
splits the MMIO table into one that contains just the offset, size
and flags (core i915) and one that has the read-only mask and handlers
(gvt) would be much simpler and not create this super-tight coupling
between core i915 and gvt.

Bonus points for moving your new intel_gvt_hw_state structure out
of struct intel_gvt and into struct i915_virtual_gpu.