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vfio: Support IO page table replacement

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Now both the physical path and the emulated path can support an IO page
table replacement. Call iommufd_device_replace/iommufd_access_replace(),
when vdev->iommufd_attached is true.

Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header.

Link: https://lore.kernel.org/r/b5f01956ff161f76aa52c95b0fa1ad6eaca95c4a.1690523699.git.nicolinc@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2023-07-27 23:33:29 -07:00 committed by Jason Gunthorpe
parent c154660b6e
commit c157fd8861
2 changed files with 12 additions and 5 deletions
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11
drivers/vfio/iommufd.c
View File

@ -146,9 +146,9 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
return -EINVAL;
if (vdev->iommufd_attached)
return -EBUSY;
rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
rc = iommufd_device_replace(vdev->iommufd_device, pt_id);
else
rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
if (rc)
return rc;
vdev->iommufd_attached = true;
@ -223,8 +223,9 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
lockdep_assert_held(&vdev->dev_set->lock);
if (vdev->iommufd_attached)
return -EBUSY;
rc = iommufd_access_attach(vdev->iommufd_access, *pt_id);
rc = iommufd_access_replace(vdev->iommufd_access, *pt_id);
else
rc = iommufd_access_attach(vdev->iommufd_access, *pt_id);
if (rc)
return rc;
vdev->iommufd_attached = true;

6
include/uapi/linux/vfio.h
View File

@ -939,6 +939,12 @@ struct vfio_device_bind_iommufd {
* Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. This is only
* allowed on cdev fds.
*
* If a vfio device is currently attached to a valid hw_pagetable, without doing
* a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl
* passing in another hw_pagetable (hwpt) id is allowed. This action, also known
* as a hw_pagetable replacement, will replace the device's currently attached
* hw_pagetable with a new hw_pagetable corresponding to the given pt_id.
*
* Return: 0 on success, -errno on failure.
*/
struct vfio_device_attach_iommufd_pt {