netdev - RE: [PATCH v14 vfio 0/8] pds-vfio-pci driver

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Message-ID: <BN9PR11MB527688FFB5206CC3150EA7958C14A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Tue, 15 Aug 2023 02:47:36 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Brett Creeley <brett.creeley@....com>, "kvm@...r.kernel.org"
	<kvm@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
	<jgg@...dia.com>, "yishaih@...dia.com" <yishaih@...dia.com>,
	"shameerali.kolothum.thodi@...wei.com" <shameerali.kolothum.thodi@...wei.com>
CC: "horms@...nel.org" <horms@...nel.org>, "shannon.nelson@....com"
	<shannon.nelson@....com>
Subject: RE: [PATCH v14 vfio 0/8] pds-vfio-pci driver

> From: Brett Creeley <brett.creeley@....com>
> Sent: Tuesday, August 8, 2023 4:58 AM
> 
> 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.
> 

the series looks good now.

Reviewed-by: Kevin Tian <kevin.tian@...el.com>