this prepares for adding DETACH ioctl for emulated VFIO devices.
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 1 +
drivers/s390/cio/vfio_ccw_ops.c | 1 +
drivers/s390/crypto/vfio_ap_ops.c | 1 +
drivers/vfio/iommufd.c | 18 ++++++++++++++++++
include/linux/vfio.h | 3 +++
5 files changed, 24 insertions(+)
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 8ae7039b3683..8a76a84bc3c1 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1474,6 +1474,7 @@ static const struct vfio_device_ops intel_vgpu_dev_ops = {
.bind_iommufd = vfio_iommufd_emulated_bind,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
+ .detach_ioas = vfio_iommufd_emulated_detach_ioas,
};
static int intel_vgpu_probe(struct mdev_device *mdev)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 5b53b94f13c7..cba4971618ff 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -632,6 +632,7 @@ static const struct vfio_device_ops vfio_ccw_dev_ops = {
.bind_iommufd = vfio_iommufd_emulated_bind,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
+ .detach_ioas = vfio_iommufd_emulated_detach_ioas,
};
struct mdev_driver vfio_ccw_mdev_driver = {
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 9c01957e56b3..f99c69d40982 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1802,6 +1802,7 @@ static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
.bind_iommufd = vfio_iommufd_emulated_bind,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
+ .detach_ioas = vfio_iommufd_emulated_detach_ioas,
};
static struct mdev_driver vfio_ap_matrix_driver = {
diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
index bfaa9876499b..faf2516b0f06 100644
--- a/drivers/vfio/iommufd.c
+++ b/drivers/vfio/iommufd.c
@@ -165,6 +165,12 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
lockdep_assert_held(&vdev->dev_set->lock);
+ if (!vdev->iommufd_ictx)
+ return -EINVAL;
+
+ if (vdev->iommufd_access)
+ return -EBUSY;
+
user = iommufd_access_create(vdev->iommufd_ictx, *pt_id, &vfio_user_ops,
vdev);
if (IS_ERR(user))
@@ -173,3 +179,15 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id)
return 0;
}
EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_attach_ioas);
+
+void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev)
+{
+ lockdep_assert_held(&vdev->dev_set->lock);
+
+ if (!vdev->iommufd_ictx || !vdev->iommufd_access)
+ return;
+
+ iommufd_access_destroy(vdev->iommufd_access);
+ vdev->iommufd_access = NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_emulated_detach_ioas);
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 234a5456b81a..6963514d9249 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -126,6 +126,7 @@ int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
+void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev);
#else
#define vfio_iommufd_physical_bind \
((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \
@@ -143,6 +144,8 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_emulated_attach_ioas \
((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
+#define vfio_iommufd_emulated_detach_ioas \
+ ((void (*)(struct vfio_device *vdev)) NULL)
#endif
/**
--
2.34.1
