linux-kernel - [PATCH 2/2] vfio/platform: Mark for removal

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Message-ID: <20250806170314.3768750-3-alex.williamson@redhat.com>
Date: Wed,  6 Aug 2025 11:03:12 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: alex.williamson@...hat.com,
	kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	eric.auger@...hat.com,
	clg@...hat.com
Subject: [PATCH 2/2] vfio/platform: Mark for removal

vfio-platform hasn't had a meaningful contribution in years.  In-tree
hardware support is predominantly only for devices which are long since
e-waste.  QEMU support for platform devices is slated for removal in
QEMU-10.2.  Eric Auger presented on the future of the vfio-platform
driver and difficulties supporting new devices at KVM Forum 2024,
gaining some support for removal, some disagreement, but garnering no
new hardware support, leaving the driver in a state where it cannot
be tested.

Mark as obsolete and subject to removal.

Link: https://lore.kernel.org/all/20250731121947.1346927-1-clg@redhat.com/
Link: https://www.youtube.com/watch?v=Q5BOSbtwRr8
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 MAINTAINERS                           |  2 +-
 drivers/vfio/platform/Kconfig         | 10 ++++++++--
 drivers/vfio/platform/reset/Kconfig   |  6 +++---
 drivers/vfio/platform/vfio_amba.c     |  2 ++
 drivers/vfio/platform/vfio_platform.c |  2 ++
 5 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 25a520467dec..c19b60032aa3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26084,7 +26084,7 @@ F:	drivers/vfio/pci/pds/
 VFIO PLATFORM DRIVER
 M:	Eric Auger <eric.auger@...hat.com>
 L:	kvm@...r.kernel.org
-S:	Maintained
+S:	Obsolete
 F:	drivers/vfio/platform/
 
 VFIO QAT PCI DRIVER
diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig
index 88fcde51f024..a8bde833e9e5 100644
--- a/drivers/vfio/platform/Kconfig
+++ b/drivers/vfio/platform/Kconfig
@@ -7,9 +7,12 @@ config VFIO_PLATFORM_BASE
 	select VFIO_VIRQFD
 
 config VFIO_PLATFORM
-	tristate "Generic VFIO support for any platform device"
+	tristate "Generic VFIO support for any platform device (DEPRECATED)"
 	select VFIO_PLATFORM_BASE
 	help
+	  The vfio-platform driver is deprecated and will be removed in a
+	  future kernel release.
+
 	  Support for platform devices with VFIO. This is required to make
 	  use of platform devices present on the system using the VFIO
 	  framework.
@@ -17,10 +20,13 @@ config VFIO_PLATFORM
 	  If you don't know what to do here, say N.
 
 config VFIO_AMBA
-	tristate "VFIO support for AMBA devices"
+	tristate "VFIO support for AMBA devices (DEPRECATED)"
 	depends on ARM_AMBA || COMPILE_TEST
 	select VFIO_PLATFORM_BASE
 	help
+	  The vfio-amba driver is deprecated and will be removed in a
+	  future kernel release.
+
 	  Support for ARM AMBA devices with VFIO. This is required to make
 	  use of ARM AMBA devices present on the system using the VFIO
 	  framework.
diff --git a/drivers/vfio/platform/reset/Kconfig b/drivers/vfio/platform/reset/Kconfig
index dcc08dc145a5..70af0dbe293b 100644
--- a/drivers/vfio/platform/reset/Kconfig
+++ b/drivers/vfio/platform/reset/Kconfig
@@ -1,21 +1,21 @@
 # SPDX-License-Identifier: GPL-2.0-only
 if VFIO_PLATFORM
 config VFIO_PLATFORM_CALXEDAXGMAC_RESET
-	tristate "VFIO support for calxeda xgmac reset"
+	tristate "VFIO support for calxeda xgmac reset (DEPRECATED)"
 	help
 	  Enables the VFIO platform driver to handle reset for Calxeda xgmac
 
 	  If you don't know what to do here, say N.
 
 config VFIO_PLATFORM_AMDXGBE_RESET
-	tristate "VFIO support for AMD XGBE reset"
+	tristate "VFIO support for AMD XGBE reset (DEPRECATED)"
 	help
 	  Enables the VFIO platform driver to handle reset for AMD XGBE
 
 	  If you don't know what to do here, say N.
 
 config VFIO_PLATFORM_BCMFLEXRM_RESET
-	tristate "VFIO support for Broadcom FlexRM reset"
+	tristate "VFIO support for Broadcom FlexRM reset (DEPRECATED)"
 	depends on ARCH_BCM_IPROC || COMPILE_TEST
 	default ARCH_BCM_IPROC
 	help
diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
index ff8ff8480968..9f5c527baa8a 100644
--- a/drivers/vfio/platform/vfio_amba.c
+++ b/drivers/vfio/platform/vfio_amba.c
@@ -70,6 +70,8 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
 	struct vfio_platform_device *vdev;
 	int ret;
 
+	dev_err_once(&adev->dev, "DEPRECATION: vfio-amba is deprecated and will be removed in a future kernel release\n");
+
 	vdev = vfio_alloc_device(vfio_platform_device, vdev, &adev->dev,
 				 &vfio_amba_ops);
 	if (IS_ERR(vdev))
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index 512533501eb7..48a49b14164a 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -59,6 +59,8 @@ static int vfio_platform_probe(struct platform_device *pdev)
 	struct vfio_platform_device *vdev;
 	int ret;
 
+	dev_err_once(&pdev->dev, "DEPRECATION: vfio-platform is deprecated and will be removed in a future kernel release\n");
+
 	vdev = vfio_alloc_device(vfio_platform_device, vdev, &pdev->dev,
 				 &vfio_platform_ops);
 	if (IS_ERR(vdev))
-- 
2.50.1