linux-kernel - Re: [PATCH 2/3] drm/i915/gvt: make gvt oblivious of kvmgt data structures

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Date:   Thu, 09 Jan 2020 11:29:22 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Julian Stecklina <julian.stecklina@...erus-technology.de>,
        intel-gvt-dev@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, hang.yuan@...el.com,
        dri-devel@...ts.freedesktop.org, zhiyuan.lv@...el.com
Subject: Re: [PATCH 2/3] drm/i915/gvt: make gvt oblivious of kvmgt data structures

On Wed, 08 Jan 2020, Julian Stecklina <julian.stecklina@...erus-technology.de> wrote:
> On Wed, 2020-01-08 at 12:24 +0200, Jani Nikula wrote:
>> On Mon, 06 Jan 2020, Julian Stecklina <julian.stecklina@...erus-technology.de>
>> wrote:
> [...]
>> > +	/* Hypervisor-specific device state. */
>> > +	void *vdev;
>> 
>> I have no clue about the relative merits of the patch, but you can use
>> the actual type for the pointer with a forward declaration. You don't
>> need the definition for that.
>> 
>> i.e.
>> 
>> struct kvmgt_vdev;
>> ...
>> 	struct kvmgt_vdev *vdev;
>
> The goal here is to make the GVT code independent of the hypervisor backend.
> Different hypervisor backends need to keep different per-device state, so using
> the KVM type here defeats the purpose.
>
> I assume this is not only useful for us, but also for other hypervisor backends,
> such as Xen or 3rd-party hypervisors.

Right, carry on, sorry for the noise. ;)

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center