Commit 234489ac authored May 31, 2023 by Nipun Gupta Committed by Alex Williamson Jun 16, 2023

vfio/cdx: add support for CDX bus



vfio-cdx driver enables IOCTLs for user space to query
MMIO regions for CDX devices and mmap them. This change
also adds support for reset of CDX devices. With VFIO
enabled on CDX devices, user-space applications can also
exercise DMA securely via IOMMU on these devices.

This change adds the VFIO CDX driver and enables the following
ioctls for CDX devices:
 - VFIO_DEVICE_GET_INFO:
 - VFIO_DEVICE_GET_REGION_INFO
 - VFIO_DEVICE_RESET

Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230531124557.11009-1-nipun.gupta@amd.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

parent 1e44c58c

MAINTAINERS

+7 −0

Original line number	Diff line number	Diff line
		@@ -22085,6 +22085,13 @@ F: Documentation/filesystems/vfat.rst
		F: fs/fat/
		F: tools/testing/selftests/filesystems/fat/

		VFIO CDX DRIVER
		M: Nipun Gupta <nipun.gupta@amd.com>
		M: Nikhil Agarwal <nikhil.agarwal@amd.com>
		L: kvm@vger.kernel.org
		S: Maintained
		F: drivers/vfio/cdx/*

		VFIO DRIVER
		M: Alex Williamson <alex.williamson@redhat.com>
		L: kvm@vger.kernel.org

drivers/vfio/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -57,6 +57,7 @@ source "drivers/vfio/pci/Kconfig"
		source "drivers/vfio/platform/Kconfig"
		source "drivers/vfio/mdev/Kconfig"
		source "drivers/vfio/fsl-mc/Kconfig"
		source "drivers/vfio/cdx/Kconfig"
		endif

		source "virt/lib/Kconfig"

drivers/vfio/Makefile

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Original line number	Diff line number	Diff line
		@@ -14,3 +14,4 @@ obj-$(CONFIG_VFIO_PCI_CORE) += pci/
		obj-$(CONFIG_VFIO_PLATFORM_BASE) += platform/
		obj-$(CONFIG_VFIO_MDEV) += mdev/
		obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/
		obj-$(CONFIG_VFIO_CDX) += cdx/

drivers/vfio/cdx/Kconfig

0 → 100644

+17 −0

Original line number	Diff line number	Diff line
		# SPDX-License-Identifier: GPL-2.0
		#
		# VFIO CDX configuration
		#
		# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
		#

		config VFIO_CDX
		tristate "VFIO support for CDX bus devices"
		depends on CDX_BUS
		select EVENTFD
		help
		Driver to enable VFIO support for the devices on CDX bus.
		This is required to make use of CDX devices present in
		the system using the VFIO framework.

		If you don't know what to do here, say N.

drivers/vfio/cdx/Makefile

0 → 100644

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Original line number	Diff line number	Diff line
		# SPDX-License-Identifier: GPL-2.0
		#
		# Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
		#

		obj-$(CONFIG_VFIO_CDX) += vfio-cdx.o

		vfio-cdx-objs := main.o