> From: Brett Creeley <brett.creeley@xxxxxxx> > Sent: Saturday, June 3, 2023 6:03 AM > > This is a patchset for a new vendor specific VFIO driver > (pds_vfio) 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 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 | || > '------------------' | '-------------' || > || | || || > 09:00.0 notifier 09:00.1 || > == PCI ===============================================||===== > || || || > .----------. .----------. || > ,-----| PF |----------| VF |-------------------, > | '----------' '----------' | VF | > | DSC | data/control | > | | path | > ----------------------------------------------------------- > why is "VF data/control path" drawn out of the VF box?
