Subject: Re: [PATCH 0/2] vfio pci: Add support for OpenCAPI devices

From: Greg Kurz <[email-masked]>
Date: Thu, 24 Oct 2019 16:32:44 +0200

Hi Christophe,

Sorry, I didn't have time to look at your other series yet and
likely the same for this one with the upcoming KVM Forum... :-\
Anyway, for any VFIO related patch, don't forget to Cc the
maintainer, Alex Williamson <[email-masked]> .

Cheers,

--
Greg

On Thu, 24 Oct 2019 15:28:03 +0200
christophe lombard <[email-masked]> wrote:

> This series adds support for the OpenCAPI devices for vfio pci.
> 
> It builds on top of the existing ocxl driver +
> http://patchwork.ozlabs.org/patch/1177999/
> 
> VFIO is a Linux kernel driver framework used by QEMU to make devices
> directly assignable to virtual machines.
> 
> All OpenCAPI devices on the same PCI slot will all be grouped and
> assigned to the same guest.
> 
> - Assume these are the devices you want to assign
>  0007:00:00.0 Processing accelerators: IBM Device 062b
>  0007:00:00.1 Processing accelerators: IBM Device 062b
> 
> - Two Devices in the group
> $ ls /sys/bus/pci/devices/0007\:00\:00.0/iommu_group/devices/
>  0007:00:00.0  0007:00:00.1
> 
> - Find vendor & device ID
> $ lspci -n -s 0007:00:00
>  0007:00:00.0 1200: 1014:062b
>  0007:00:00.1 1200: 1014:062b
> 
> - Unbind from the current ocxl device driver if already loaded
> $ rmmod ocxl
> 
> - Load vfio-pci if it's not already done.
> $ modprobe vfio-pci
> 
> - Bind to vfio-pci
> $ echo 1014 062b > /sys/bus/pci/drivers/vfio-pci/new_id
> 
>   This will result in a new device node "/dev/vfio/7", which will be
>   use by QEMU to setup the devices for passthrough.
> 
> - Pass to qemu using -device vfio-pci
>   -device vfio-pci,multifunction=on,host=0007:00:00.0,addr=2.0 -device
>   vfio-pci,multifunction=on,host=0007:00:00.1,addr=2.1
> 
> It has been tested in a bare-metal and QEMU environment using the memcpy
> and the AFP AFUs.
> 
> christophe lombard (2):
>   powerpc/powernv: Register IOMMU group for OpenCAPI devices
>   vfio/pci: Introduce OpenCAPI devices support.
> 
>  arch/powerpc/platforms/powernv/ocxl.c     | 164 ++++++++++---
>  arch/powerpc/platforms/powernv/pci-ioda.c |  19 +-
>  arch/powerpc/platforms/powernv/pci.h      |  13 +
>  drivers/vfio/pci/Kconfig                  |   7 +
>  drivers/vfio/pci/Makefile                 |   1 +
>  drivers/vfio/pci/vfio_pci.c               |  19 ++
>  drivers/vfio/pci/vfio_pci_ocxl.c          | 287 ++++++++++++++++++++++
>  drivers/vfio/vfio.c                       |  25 ++
>  include/linux/vfio.h                      |  13 +
>  include/uapi/linux/vfio.h                 |  22 ++
>  10 files changed, 530 insertions(+), 40 deletions(-)
>  create mode 100644 drivers/vfio/pci/vfio_pci_ocxl.c
>