| Message ID | 0f8d110eabc40e71fd2c37f63b1bc8888c67414f.1677288789.git.nicolinc@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add IO page table replacement support for emulated pathway | expand |
> From: Nicolin Chen <nicolinc@nvidia.com> > Sent: Saturday, February 25, 2023 9:52 AM > > 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> > Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> From: Nicolin Chen <nicolinc@nvidia.com> > Sent: Saturday, February 25, 2023 9:52 AM > > 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> > Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Yi Liu <yi.l.liu@intel.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 43bd6b76e2b6..0381f6e7f4e6 100644 > --- a/drivers/vfio/vfio_main.c > +++ b/drivers/vfio/vfio_main.c > @@ -1292,6 +1292,8 @@ 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); > @@ -1329,6 +1331,8 @@ 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); > -- > 2.39.2
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 43bd6b76e2b6..0381f6e7f4e6 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -1292,6 +1292,8 @@ 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); @@ -1329,6 +1331,8 @@ 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);
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> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- drivers/vfio/vfio_main.c | 4 ++++ 1 file changed, 4 insertions(+)