From 34a255e67615995f729254307a0581c143e03752 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Fri, 22 Jul 2022 19:02:56 -0700 Subject: vfio: Replace phys_pfn with pages for vfio_pin_pages() Most of the callers of vfio_pin_pages() want "struct page *" and the low-level mm code to pin pages returns a list of "struct page *" too. So there's no gain in converting "struct page *" to PFN in between. Replace the output parameter "phys_pfn" list with a "pages" list, to simplify callers. This also allows us to replace the vfio_iommu_type1 implementation with a more efficient one. And drop the pfn_valid check in the gvt code, as there is no need to do such a check at a page-backed struct page pointer. For now, also update vfio_iommu_type1 to fit this new parameter too. Reviewed-by: Christoph Hellwig Reviewed-by: Kirti Wankhede Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian Acked-by: Eric Farman Tested-by: Terrence Xu Tested-by: Eric Farman Signed-off-by: Nicolin Chen Link: https://lore.kernel.org/r/20220723020256.30081-11-nicolinc@nvidia.com Signed-off-by: Alex Williamson --- Documentation/driver-api/vfio-mediated-device.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation/driver-api') diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst index ea32a0f13ddb..ba5fefcdae1a 100644 --- a/Documentation/driver-api/vfio-mediated-device.rst +++ b/Documentation/driver-api/vfio-mediated-device.rst @@ -263,7 +263,7 @@ The following APIs are provided for translating user pfn to host pfn in a VFIO driver:: int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova, - int npage, int prot, unsigned long *phys_pfn); + int npage, int prot, struct page **pages); void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage); -- cgit