linux-kernel - Re: [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI support for the idxd driver

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Date:   Mon, 2 Nov 2020 09:20:36 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Dave Jiang <dave.jiang@...el.com>, <vkoul@...nel.org>,
        <megha.dey@...el.com>, <maz@...nel.org>, <bhelgaas@...gle.com>,
        <alex.williamson@...hat.com>, <jacob.jun.pan@...el.com>,
        <yi.l.liu@...el.com>, <baolu.lu@...el.com>, <kevin.tian@...el.com>,
        <sanjay.k.kumar@...el.com>, <tony.luck@...el.com>,
        <jing.lin@...el.com>, <dan.j.williams@...el.com>,
        <kwankhede@...dia.com>, <eric.auger@...hat.com>,
        <parav@...lanox.com>, <rafael@...nel.org>, <netanelg@...lanox.com>,
        <shahafs@...lanox.com>, <yan.y.zhao@...ux.intel.com>,
        <pbonzini@...hat.com>, <samuel.ortiz@...el.com>,
        <mona.hossain@...el.com>, Megha Dey <megha.dey@...ux.intel.com>,
        <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 00/17] Add VFIO mediated device support and DEV-MSI
 support for the idxd driver

On Sat, Oct 31, 2020 at 04:53:59PM -0700, Raj, Ashok wrote:

> If we are doing this just to improve review effectiveness, Now we would need
> some parent driver, and these sub-drivers registering seemed like a bit of
> over-engineering when these sub-drivers actually are an extension of the
> base driver and offer nothing more than extending sub-device partitions
> of IDXD for guest drivers. These look and feel like IDXD, not another device 
> interface. In that sense if we move PF/VF mailboxes as
> separate drivers i thought it feels a bit odd.

You need this split anyhow, putting VFIO calls into the main idxd
module is not OK.

Plugging in a PCI device should not auto-load VFIO modules.

Jason