From: Alex Williamson <alex.williamson@redhat.com>
To: Yishai Hadas <yishaih@nvidia.com>
Cc: <bhelgaas@google.com>, <corbet@lwn.net>,
<diana.craciun@oss.nxp.com>, <kwankhede@nvidia.com>,
<eric.auger@redhat.com>, <masahiroy@kernel.org>,
<michal.lkml@markovi.net>, <linux-pci@vger.kernel.org>,
<linux-doc@vger.kernel.org>, <kvm@vger.kernel.org>,
<linux-s390@vger.kernel.org>, <linux-kbuild@vger.kernel.org>,
<mgurtovoy@nvidia.com>, <jgg@nvidia.com>, <maorg@nvidia.com>,
<leonro@nvidia.com>
Subject: Re: [PATCH 12/12] vfio/pci: Introduce vfio_pci_core.ko
Date: Tue, 27 Jul 2021 15:54:40 -0600 [thread overview]
Message-ID: <20210727155440.680ee22e.alex.williamson@redhat.com> (raw)
In-Reply-To: <20210721161609.68223-13-yishaih@nvidia.com>
On Wed, 21 Jul 2021 19:16:09 +0300
Yishai Hadas <yishaih@nvidia.com> wrote:
> From: Max Gurtovoy <mgurtovoy@nvidia.com>
>
> Now that vfio_pci has been split into two source modules, one focusing
> on the "struct pci_driver" (vfio_pci.c) and a toolbox library of code
> (vfio_pci_core.c), complete the split and move them into two different
> kernel modules.
>
> As before vfio_pci.ko continues to present the same interface under
> sysfs and this change will have no functional impact.
>
> Splitting into another module and adding exports allows creating new HW
> specific VFIO PCI drivers that can implement device specific
> functionality, such as VFIO migration interfaces or specialized device
> requirements.
>
> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
> ---
> drivers/vfio/pci/Kconfig | 30 ++++++++------
> drivers/vfio/pci/Makefile | 8 ++--
> drivers/vfio/pci/vfio_pci.c | 14 ++-----
> drivers/vfio/pci/vfio_pci_config.c | 2 +-
> drivers/vfio/pci/vfio_pci_core.c | 41 ++++++++++++++++---
> drivers/vfio/pci/vfio_pci_igd.c | 2 +-
> drivers/vfio/pci/vfio_pci_intrs.c | 2 +-
> drivers/vfio/pci/vfio_pci_rdwr.c | 2 +-
> drivers/vfio/pci/vfio_pci_zdev.c | 2 +-
> .../pci => include/linux}/vfio_pci_core.h | 2 -
> 10 files changed, 66 insertions(+), 39 deletions(-)
> rename {drivers/vfio/pci => include/linux}/vfio_pci_core.h (99%)
>
> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
> index afdab7d71e98..18898ae49919 100644
> --- a/drivers/vfio/pci/Kconfig
> +++ b/drivers/vfio/pci/Kconfig
> @@ -1,19 +1,31 @@
> # SPDX-License-Identifier: GPL-2.0-only
> -config VFIO_PCI
> +config VFIO_PCI_CORE
> tristate "VFIO support for PCI devices"
> depends on PCI
> depends on MMU
> select VFIO_VIRQFD
> select IRQ_BYPASS_MANAGER
> help
> - Support for the PCI VFIO bus driver. This is required to make
> - use of PCI drivers using the VFIO framework.
> + Support for using PCI devices with VFIO.
> +
> +if VFIO_PCI_CORE
> +config VFIO_PCI_MMAP
> + def_bool y if !S390
> +
> +config VFIO_PCI_INTX
> + def_bool y if !S390
> +
> +config VFIO_PCI
> + tristate "Generic VFIO support for any PCI device"
> + help
> + Support for the generic PCI VFIO bus driver which can connect any
> + PCI device to the VFIO framework.
>
> If you don't know what to do here, say N.
>
I'm still not happy with how this is likely to break users and even
downstreams when upgrading to a Kconfig with this change. A previously
selected VFIO_PCI comes out disabled unless the user is keen enough to
enable VFIO_PCI_CORE. I think I'd prefer to sacrifice the purity of
the menus to pull VFIO_PCI out of the if block and have it select
VFIO_PCI_CORE. Thanks,
Alex
next prev parent reply other threads:[~2021-07-27 21:54 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 16:15 [PATCH 00/12] Introduce vfio_pci_core subsystem Yishai Hadas
2021-07-21 16:15 ` [PATCH 01/12] vfio/pci: Rename vfio_pci.c to vfio_pci_core.c Yishai Hadas
2021-07-21 16:15 ` [PATCH 02/12] vfio/pci: Rename vfio_pci_private.h to vfio_pci_core.h Yishai Hadas
2021-07-21 16:16 ` [PATCH 03/12] vfio/pci: Rename vfio_pci_device to vfio_pci_core_device Yishai Hadas
2021-07-21 16:16 ` [PATCH 04/12] vfio/pci: Rename ops functions to fit core namings Yishai Hadas
2021-07-21 16:16 ` [PATCH 05/12] vfio/pci: Include vfio header in vfio_pci_core.h Yishai Hadas
2021-07-21 16:16 ` [PATCH 06/12] vfio/pci: Split the pci_driver code out of vfio_pci_core.c Yishai Hadas
2021-07-21 16:16 ` [PATCH 07/12] vfio/pci: Move igd initialization to vfio_pci.c Yishai Hadas
2021-07-21 16:16 ` [PATCH 08/12] vfio/pci: Move module parameters " Yishai Hadas
2021-07-21 16:16 ` [PATCH 09/12] PCI: Add a PCI_ID_F_VFIO_DRIVER_OVERRIDE flag to struct pci_device_id Yishai Hadas
2021-07-27 16:34 ` Alex Williamson
2021-07-27 17:14 ` Jason Gunthorpe
2021-07-27 23:02 ` Alex Williamson
2021-07-27 23:42 ` Jason Gunthorpe
2021-08-04 20:34 ` Bjorn Helgaas
2021-08-05 16:47 ` Max Gurtovoy
2021-08-06 0:23 ` Jason Gunthorpe
2021-08-11 12:22 ` Max Gurtovoy
2021-08-11 19:07 ` Bjorn Helgaas
2021-08-12 13:27 ` Jason Gunthorpe
2021-08-12 15:57 ` Bjorn Helgaas
2021-08-12 19:51 ` Jason Gunthorpe
2021-08-12 20:26 ` Bjorn Helgaas
2021-08-12 23:21 ` Max Gurtovoy
2021-08-13 17:44 ` Bjorn Helgaas
2021-08-14 23:27 ` Max Gurtovoy
2021-08-16 17:21 ` Bjorn Helgaas
2021-08-17 13:01 ` Max Gurtovoy
2021-08-17 14:13 ` Bjorn Helgaas
2021-08-17 14:44 ` Max Gurtovoy
2021-08-12 15:42 ` Bjorn Helgaas
2021-07-21 16:16 ` [PATCH 10/12] vfio: Use select for eventfd Yishai Hadas
2021-07-21 16:16 ` [PATCH 11/12] vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on' Yishai Hadas
2021-07-21 16:16 ` [PATCH 12/12] vfio/pci: Introduce vfio_pci_core.ko Yishai Hadas
2021-07-21 17:39 ` Leon Romanovsky
2021-07-22 9:06 ` Yishai Hadas
2021-07-22 9:22 ` Max Gurtovoy
2021-07-23 14:13 ` Leon Romanovsky
2021-07-25 10:45 ` Max Gurtovoy
2021-07-27 21:54 ` Alex Williamson [this message]
2021-07-27 23:09 ` Jason Gunthorpe
2021-07-28 4:56 ` Leon Romanovsky
2021-07-28 5:43 ` Christoph Hellwig
2021-07-28 7:04 ` Arnd Bergmann
2021-07-28 7:17 ` Leon Romanovsky
2021-07-28 12:03 ` Jason Gunthorpe
2021-07-28 12:12 ` Arnd Bergmann
2021-07-28 12:29 ` Christoph Hellwig
2021-07-28 12:47 ` Jason Gunthorpe
2021-07-28 12:55 ` Christoph Hellwig
2021-07-28 13:31 ` Jason Gunthorpe
2021-07-28 13:08 ` Arnd Bergmann
2021-07-28 17:26 ` Jason Gunthorpe
2021-08-04 13:41 ` [PATCH 00/12] Introduce vfio_pci_core subsystem Yishai Hadas
2021-08-04 15:27 ` Alex Williamson
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