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From: Jason Gunthorpe <jgg@nvidia.com>
To: Alex Williamson <alex.williamson@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Arnd Bergmann <arnd@arndb.de>
Cc: 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: Tue, 27 Jul 2021 20:09:41 -0300	[thread overview]
Message-ID: <20210727230941.GL1721383@nvidia.com> (raw)
In-Reply-To: <20210727155440.680ee22e.alex.williamson@redhat.com>

On Tue, Jul 27, 2021 at 03:54:40PM -0600, Alex Williamson wrote:

> I'm still not happy with how this is likely to break users and even
> downstreams when upgrading to a Kconfig with this change.

I've never heard of Kconfig as stable ABI. Christoph/Arnd, have you
heard of any cases where we want to keep it stable?

As far as I know we should change kconfig to keep it working properly,
eg by having correct menu structure and sane kconfig names.

In any event, upgrades work in a reasonable way. Starting from this
.config fragment:

CONFIG_VFIO_IOMMU_TYPE1=y
CONFIG_VFIO_VIRQFD=y
CONFIG_VFIO=y
CONFIG_VFIO_NOIOMMU=y
CONFIG_VFIO_PCI=y
CONFIG_VFIO_PCI_VGA=y
CONFIG_VFIO_PCI_MMAP=y
CONFIG_VFIO_PCI_INTX=y
CONFIG_VFIO_PCI_IGD=y
CONFIG_VFIO_PLATFORM=y
CONFIG_VFIO_AMBA=y
CONFIG_VFIO_PLATFORM_CALXEDAXGMAC_RESET=y
CONFIG_VFIO_PLATFORM_AMDXGBE_RESET=y
CONFIG_VFIO_PLATFORM_BCMFLEXRM_RESET=y
CONFIG_VFIO_MDEV=y
CONFIG_VFIO_FSL_MC=y
CONFIG_IRQ_BYPASS_MANAGER=y

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.

The menu structure ends up looking like this, which is pretty good:

  --- VFIO Non-Privileged userspace driver framework
  [*]   VFIO No-IOMMU support
  <*>   VFIO support for PCI devices
  <*>     Generic VFIO support for any PCI device
  [*]       Generic VFIO PCI support for VGA devices
  [*]       Generic VFIO PCI extensions for Intel graphics (GVT-d)
  <*>     VFIO support for MLX5 PCI devices (NEW)
  <*>   VFIO support for platform devices
  <*>     VFIO support for AMBA devices
  <*>     VFIO support for calxeda xgmac reset
  <*>     VFIO support for AMD XGBE reset
  <*>     VFIO support for Broadcom FlexRM reset
  <*>   Mediated device driver framework
  <*>   VFIO support for QorIQ DPAA2 fsl-mc bus devices

Jason

  reply	other threads:[~2021-07-27 23:09 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 [this message]
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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