netdev - Re: [PATCH v13 vfio 0/7] pds-vfio-pci driver

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Date: Thu, 3 Aug 2023 10:28:55 +0200
From: Simon Horman <horms@...nel.org>
To: Brett Creeley <brett.creeley@....com>
Cc: kvm@...r.kernel.org, netdev@...r.kernel.org, alex.williamson@...hat.com,
	jgg@...dia.com, yishaih@...dia.com,
	shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
	simon.horman@...igine.com, shannon.nelson@....com
Subject: Re: [PATCH v13 vfio 0/7] pds-vfio-pci driver

On Tue, Jul 25, 2023 at 02:40:18PM -0700, Brett Creeley wrote:
> This is a patchset for a new vendor specific VFIO driver
> (pds-vfio-pci) for use with the AMD/Pensando Distributed Services
> Card (DSC). This driver makes use of the pds_core driver.
> 
> This driver will use the pds_core device's adminq as the VFIO
> control path to the DSC. In order to make adminq calls, the VFIO
> instance makes use of functions exported by the pds_core driver.
> 
> In order to receive events from pds_core, the pds-vfio-pci driver
> registers to a private notifier. This is needed for various events
> that come from the device.
> 
> An ASCII diagram of a VFIO instance looks something like this and can
> be used with the VFIO subsystem to provide the VF device VFIO and live
> migration support.
> 
>                                .------.  .-----------------------.
>                                | QEMU |--|  VM  .-------------.  |
>                                '......'  |      |   Eth VF    |  |
>                                   |      |      .-------------.  |
>                                   |      |      |  SR-IOV VF  |  |
>                                   |      |      '-------------'  |
>                                   |      '------------||---------'
>                                .--------------.       ||
>                                |/dev/<vfio_fd>|       ||
>                                '--------------'       ||
> Host Userspace                         |              ||
> ===================================================   ||
> Host Kernel                            |              ||
>                                   .--------.          ||
>                                   |vfio-pci|          ||
>                                   '--------'          ||
>        .------------------.           ||              ||
>        |   | exported API |<----+     ||              ||
>        |   '--------------|     |     ||              ||
>        |                  |    .--------------.       ||
>        |     pds_core     |--->| pds-vfio-pci |       ||
>        '------------------' |  '--------------'       ||
>                ||           |         ||              ||
>              09:00.0     notifier    09:00.1          ||
> == PCI ===============================================||=====
>                ||                     ||              ||
>           .----------.          .----------.          ||
>     ,-----|    PF    |----------|    VF    |-------------------,
>     |     '----------'         |'----------'         VF        |
>     |                     DSC  |                 data/control  |
>     |                          |                     path      |
>     -----------------------------------------------------------
> 
> The pds-vfio-pci driver is targeted to reside in drivers/vfio/pci/pds.
> It makes use of and introduces new files in the common include/linux/pds
> include directory.
> 
> Note: This series is based on the latest linux-next tree. I did not base
> it on the Alex Williamson's vfio/next because it has not yet pulled in
> the latest changes which include the pds_vdpa driver. The pds_vdpa
> driver has conflicts with the pds-vfio-pci driver that needed to be
> resolved, which is why this series is based on the latest linux-next
> tree.

For series,

Reviewed-by: Simon Horman <horms@...nel.org>