linux-kernel - Re: [PATCH v2 01/11] genirq/affinity:: Export irq_create_affinity

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Message-ID: <20221206084736.GA9507@lst.de>
Date:   Tue, 6 Dec 2022 09:47:36 +0100
From:   Christoph Hellwig <hch@....de>
To:     Yongji Xie <xieyongji@...edance.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 01/11] genirq/affinity:: Export
 irq_create_affinity_masks()

On Tue, Dec 06, 2022 at 04:40:37PM +0800, Yongji Xie wrote:
> With the vDPA framework, some drivers (vduse, vdpa-sim) can create
> software-defined virtio devices and attach them to the virtio bus.
> This kind of virtio device is not a pci device or a platform device.
> So it would be needed to export this function if we want to implement
> the automatic affinity management for the virtio device driver which
> is binded to this device.

Why are these devices even using interrupts?  The whjole vdpa thing
is a mess, I also still need to fix up the horrible abuse of the DMA
API for something that isn't even DMA, and this just seems to spread
that same mistake even further.