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| author |   Nicolin Chen <nicolinc@nvidia.com> | 2022-07-22 19:02:51 -0700 |
|---|---|---|
| committer |   Alex Williamson <alex.williamson@redhat.com> | 2022-07-25 13:41:22 -0600 |
| commit | 44abdd1646e1fbfb781972c0bffc90b4eb3e87b3 (patch) | |
| tree | 39c021a815c329441988d4474751f33ae95cd3f6 /Documentation/driver-api/vfio-mediated-device.rst | |
| parent | vfio/ccw: Only pass in contiguous pages (diff) | |
| download | wireguard-linux-44abdd1646e1fbfb781972c0bffc90b4eb3e87b3.tar.xz wireguard-linux-44abdd1646e1fbfb781972c0bffc90b4eb3e87b3.zip | |
vfio: Pass in starting IOVA to vfio_pin/unpin_pages API
The vfio_pin/unpin_pages() so far accepted arrays of PFNs of user IOVA.
Among all three callers, there was only one caller possibly passing in
a non-contiguous PFN list, which is now ensured to have contiguous PFN
inputs too.
Pass in the starting address with "iova" alone to simplify things, so
callers no longer need to maintain a PFN list or to pin/unpin one page
at a time. This also allows VFIO to use more efficient implementations
of pin/unpin_pages.
For now, also update vfio_iommu_type1 to fit this new parameter too,
while keeping its input intact (being user_iova) since we don't want
to spend too much effort swapping its parameters and local variables
at that level.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Eric Farman <farman@linux.ibm.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/20220723020256.30081-6-nicolinc@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'Documentation/driver-api/vfio-mediated-device.rst')
| -rw-r--r-- | Documentation/driver-api/vfio-mediated-device.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index b0fdf76b339a..ea32a0f13ddb 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -262,10 +262,10 @@ Translation APIs for Mediated Devices The following APIs are provided for translating user pfn to host pfn in a VFIO driver:: - int vfio_pin_pages(struct vfio_device *device, unsigned long *user_pfn, + int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova, int npage, int prot, unsigned long *phys_pfn); - void vfio_unpin_pages(struct vfio_device *device, unsigned long *user_pfn, + void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage); These functions call back into the back-end IOMMU module by using the pin_pages |