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Date: Sun, 11 Dec 2022 17:16:44 -0800
From: Brett Creeley <bcreeley@....com>
To: Max Gurtovoy <mgurtovoy@...dia.com>,
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 12/11/2022 4:54 AM, Max Gurtovoy wrote:
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
>
>
> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fnetdev%2F20221207004443.33779-1-shannon.nelson%40amd.com%2F&data=05%7C01%7Cbrett.creeley%40amd.com%7C0591fe11a7c24bf8789908dadb76db84%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638063600829691750%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3VMvNtUto4HwCap65NvWrIADbLzGk4Ef9ZnA9fAB458%3D&reserved=0
>>
>> 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_core driver has the following as its only pci_device_id
entry:
PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_CORE_PF)
>
>>
>>
>> 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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