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linux/drivers/vfio
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Ramesh Thomas f601bb7d53 vfio/pci: Enable iowrite64 and ioread64 for vfio pci 
[ Upstream commit 2b938e3db3 ]

Definitions of ioread64 and iowrite64 macros in asm/io.h called by vfio
pci implementations are enclosed inside check for CONFIG_GENERIC_IOMAP.
They don't get defined if CONFIG_GENERIC_IOMAP is defined. Include
linux/io-64-nonatomic-lo-hi.h to define iowrite64 and ioread64 macros
when they are not defined. io-64-nonatomic-lo-hi.h maps the macros to
generic implementation in lib/iomap.c. The generic implementation does
64 bit rw if readq/writeq is defined for the architecture, otherwise it
would do 32 bit back to back rw.

Note that there are two versions of the generic implementation that
differs in the order the 32 bit words are written if 64 bit support is
not present. This is not the little/big endian ordering, which is
handled separately. This patch uses the lo followed by hi word ordering
which is consistent with current back to back implementation in the
vfio/pci code.

Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20241210131938.303500-2-ramesh.thomas@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-21 13:49:59 +01:00
..
fsl-mc vfio/fsl-mc: Block calling interrupt handler without trigger 2024-04-03 15:19:47 +02:00
mdev vfio/mdev: Fix a null-ptr-deref bug for mdev_unregister_parent() 2023-10-06 14:56:45 +02:00
pci vfio/pci: Enable iowrite64 and ioread64 for vfio pci 2025-02-21 13:49:59 +01:00
platform vfio/platform: check the bounds of read/write syscalls 2025-02-21 13:49:50 +01:00
container.c vfio: Use GFP_KERNEL_ACCOUNT for userspace persistent allocations 2024-04-03 15:19:34 +02:00
iova_bitmap.c iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index() 2025-02-21 13:49:17 +01:00
Kconfig vfio: Introduce the DMA logging feature support 2022-09-08 12:59:00 -06:00
Makefile vfio: Move container code into drivers/vfio/container.c 2022-09-22 15:46:06 -06:00
vfio.h vfio: Make the group FD disassociate from the iommu_group 2022-10-07 08:10:52 -06:00
vfio_iommu_spapr_tce.c vfio/spapr_tce: Fix the comment 2022-07-22 16:24:47 -06:00
vfio_iommu_type1.c vfio/type1: fix cap_migration information leak 2023-09-13 09:42:47 +02:00
vfio_main.c vfio: Export the device set open count 2022-11-10 12:03:36 -07:00
vfio_spapr_eeh.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
virqfd.c vfio: Introduce interface to flush virqfd inject workqueue 2024-04-03 15:19:46 +02:00