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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>
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