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Date: Sun, 11 Dec 2022 14:54:26 +0200
From: Max Gurtovoy <mgurtovoy@...dia.com>
To: Brett Creeley <brett.creeley@....com>, kvm@...r.kernel.org,
netdev@...r.kernel.org, alex.williamson@...hat.com,
cohuck@...hat.com, jgg@...dia.com, yishaih@...dia.com,
shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com
Cc: shannon.nelson@....com, drivers@...sando.io,
Oren Duer <oren@...dia.com>
Subject: Re: [RFC PATCH vfio 0/7] pds vfio driver
On 12/7/2022 3:06 AM, Brett Creeley wrote:
> This is a first draft patchset for a new vendor specific VFIO driver for
> use with the AMD/Pensando Distributed Services Card (DSC). This driver
> (pds_vfio) is a client of the newly introduced pds_core driver.
>
> Reference to the pds_core patchset:
> https://lore.kernel.org/netdev/20221207004443.33779-1-shannon.nelson@amd.com/
>
> AMD/Pensando already supports a NVMe VF device (1dd8:1006) in the
> Distributed Services Card (DSC). This patchset adds the new pds_vfio
> driver in order to support NVMe VF live migration.
>
> This driver will use the pds_core device and auxiliary_bus as the VFIO
> control path to the DSC. The pds_core device creates auxiliary_bus devices
> for each live migratable VF. The devices are named by their feature plus
> the VF PCI BDF so the auxiliary_bus driver implemented by pds_vfio can find
> its related VF PCI driver instance. Once this auxiliary bus connection
> is configured, the pds_vfio driver can send admin queue commands to the
> device and receive events from pds_core.
>
> An ASCII diagram of a VFIO instance looks something like this and can
> be used with the VFIO subsystem to provide devices VFIO and live
> migration support.
>
> .------. .--------------------------.
> | QEMU |--| VM .-------------. |
> '......' | | nvme driver | |
> | | .-------------. |
> | | | SR-IOV VF | |
> | | '-------------' |
> | '---------------||---------'
> .--------------. ||
> |/dev/<vfio_fd>| ||
> '--------------' ||
> Host Userspace | ||
> =================================================== ||
> Host Kernel | ||
> | ||
> pds_core.LM.2305 <--+ .--------. ||
> | | |vfio-pci| ||
> | | '--------' ||
> | | | ||
> .------------. .-------------. ||
> | pds_core | | pds_vfio | ||
> '------------' '-------------' ||
> || || ||
> 09:00.0 09:00.1 ||
> == PCI ==================================================||=====
> || || ||
> .----------. .----------. ||
> ,-----| PF |---------| VF |-------------------,
> | '----------' '----------' | nvme |
> | DSC | data/control |
> | | path |
> -----------------------------------------------------------
Hi Brett,
what is the class code of the pds_core device ?
I see that pds_vfio class_code is PCI_CLASS_STORAGE_EXPRESS.
>
>
> The pds_vfio 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.
>
> Brett Creeley (7):
> pds_vfio: Initial support for pds_vfio VFIO driver
> pds_vfio: Add support to register as PDS client
> pds_vfio: Add VFIO live migration support
> vfio: Commonize combine_ranges for use in other VFIO drivers
> pds_vfio: Add support for dirty page tracking
> pds_vfio: Add support for firmware recovery
> pds_vfio: Add documentation files
>
> .../ethernet/pensando/pds_vfio.rst | 88 +++
> drivers/vfio/pci/Kconfig | 2 +
> drivers/vfio/pci/mlx5/cmd.c | 48 +-
> drivers/vfio/pci/pds/Kconfig | 10 +
> drivers/vfio/pci/pds/Makefile | 12 +
> drivers/vfio/pci/pds/aux_drv.c | 216 +++++++
> drivers/vfio/pci/pds/aux_drv.h | 30 +
> drivers/vfio/pci/pds/cmds.c | 486 ++++++++++++++++
> drivers/vfio/pci/pds/cmds.h | 44 ++
> drivers/vfio/pci/pds/dirty.c | 541 ++++++++++++++++++
> drivers/vfio/pci/pds/dirty.h | 49 ++
> drivers/vfio/pci/pds/lm.c | 484 ++++++++++++++++
> drivers/vfio/pci/pds/lm.h | 53 ++
> drivers/vfio/pci/pds/pci_drv.c | 134 +++++
> drivers/vfio/pci/pds/pci_drv.h | 9 +
> drivers/vfio/pci/pds/vfio_dev.c | 238 ++++++++
> drivers/vfio/pci/pds/vfio_dev.h | 42 ++
> drivers/vfio/vfio_main.c | 48 ++
> include/linux/pds/pds_core_if.h | 1 +
> include/linux/pds/pds_lm.h | 356 ++++++++++++
> include/linux/vfio.h | 3 +
> 21 files changed, 2847 insertions(+), 47 deletions(-)
> create mode 100644 Documentation/networking/device_drivers/ethernet/pensando/pds_vfio.rst
> create mode 100644 drivers/vfio/pci/pds/Kconfig
> create mode 100644 drivers/vfio/pci/pds/Makefile
> create mode 100644 drivers/vfio/pci/pds/aux_drv.c
> create mode 100644 drivers/vfio/pci/pds/aux_drv.h
> create mode 100644 drivers/vfio/pci/pds/cmds.c
> create mode 100644 drivers/vfio/pci/pds/cmds.h
> create mode 100644 drivers/vfio/pci/pds/dirty.c
> create mode 100644 drivers/vfio/pci/pds/dirty.h
> create mode 100644 drivers/vfio/pci/pds/lm.c
> create mode 100644 drivers/vfio/pci/pds/lm.h
> create mode 100644 drivers/vfio/pci/pds/pci_drv.c
> create mode 100644 drivers/vfio/pci/pds/pci_drv.h
> create mode 100644 drivers/vfio/pci/pds/vfio_dev.c
> create mode 100644 drivers/vfio/pci/pds/vfio_dev.h
> create mode 100644 include/linux/pds/pds_lm.h
>
> --
> 2.17.1
>
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