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From: Jason Gunthorpe <jgg@nvidia.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Alex Williamson <alex.williamson@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>, Yishai Hadas <yishaih@nvidia.com>,
	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,
	maorg@nvidia.com, leonro@nvidia.com
Subject: Re: [PATCH 12/12] vfio/pci: Introduce vfio_pci_core.ko
Date: Wed, 28 Jul 2021 09:03:26 -0300	[thread overview]
Message-ID: <20210728120326.GQ1721383@nvidia.com> (raw)
In-Reply-To: <20210728054306.GA3421@lst.de>

On Wed, Jul 28, 2021 at 07:43:06AM +0200, Christoph Hellwig wrote:

> > Which might reasonably be from an old kernel. 'make oldconfig' prompts:
> > 
> > VFIO Non-Privileged userspace driver framework (VFIO) [Y/n/m/?] y
> >   VFIO No-IOMMU support (VFIO_NOIOMMU) [Y/n/?] y
> >   VFIO support for PCI devices (VFIO_PCI_CORE) [N/m/y/?] (NEW) 
> > 
> > Which is completely fine, IMHO.
> 
> Why do we need to have VFIO_PCI_CORE as a user visible option?
> I'd just select it.

I'm not great with kconfig, but AFAIK:

- It controls building a module so it needs to be a tristate

- tristates need to be exposed in the menu structure

- As it builds a module it also has depends on other things

- Select should not be used to target tristates

- Select should not be used to target options in the menu tree

- Select should not be used to target options that have depends

Which leaves us with this arrangement unless we delete the
vfio_pci_core.ko module - which seems like a bad direction just for
kconfig backwards compatibility.

Jason

  parent reply	other threads:[~2021-07-28 12:03 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
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 [this message]
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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