From 8d46c0cca5f4dc0538173d62cd36b1119b5105bc Mon Sep 17 00:00:00 2001 From: Yan Zhao Date: Tue, 24 Mar 2020 09:27:57 -0600 Subject: vfio: introduce vfio_dma_rw to read/write a range of IOVAs vfio_dma_rw will read/write a range of user space memory pointed to by IOVA into/from a kernel buffer without enforcing pinning the user space memory. TODO: mark the IOVAs to user space memory dirty if they are written in vfio_dma_rw(). Cc: Kevin Tian Signed-off-by: Yan Zhao Signed-off-by: Alex Williamson --- include/linux/vfio.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux/vfio.h') diff --git a/include/linux/vfio.h b/include/linux/vfio.h index fb71e0ac0e76..34b2fdf4de6e 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -82,6 +82,8 @@ struct vfio_iommu_driver_ops { struct notifier_block *nb); int (*unregister_notifier)(void *iommu_data, struct notifier_block *nb); + int (*dma_rw)(void *iommu_data, dma_addr_t user_iova, + void *data, size_t count, bool write); }; extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops); @@ -109,6 +111,9 @@ extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn, extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn, int npage); +extern int vfio_dma_rw(struct vfio_group *group, dma_addr_t user_iova, + void *data, size_t len, bool write); + /* each type has independent events */ enum vfio_notify_type { VFIO_IOMMU_NOTIFY = 0, -- cgit v1.2.3