Messages in this thread Patch in this message | | | From | Nicolin Chen <> | Subject | [PATCH v6 1/4] vfio: Do not allow !ops->dma_unmap in vfio_pin/unpin_pages() | Date | Mon, 27 Mar 2023 11:05:02 -0700 |
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A driver that doesn't implement ops->dma_unmap shouldn't be allowed to do vfio_pin/unpin_pages(), though it can use vfio_dma_rw() to access an iova range. Deny !ops->dma_unmap cases in vfio_pin/unpin_pages().
Suggested-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Yi Liu <yi.l.liu@intel.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- drivers/vfio/vfio_main.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 896d8bb49585..48807d587946 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1485,6 +1485,8 @@ int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova, /* group->container cannot change while a vfio device is open */ if (!pages || !npage || WARN_ON(!vfio_assert_device_open(device))) return -EINVAL; + if (!device->ops->dma_unmap) + return -EINVAL; if (vfio_device_has_container(device)) return vfio_device_container_pin_pages(device, iova, npage, prot, pages); @@ -1522,6 +1524,8 @@ void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage) { if (WARN_ON(!vfio_assert_device_open(device))) return; + if (WARN_ON(!device->ops->dma_unmap)) + return; if (vfio_device_has_container(device)) { vfio_device_container_unpin_pages(device, iova, npage); -- 2.40.0
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