[RFC v3 10/18] vfio/ap: Use vfio_[attach/detach]_device

[Eric Auger]

Let the vfio-ap device use vfio_attach_device() and
vfio_detach_device(), hence hiding the details of the used
IOMMU backend.

Signed-off-by: Eric Auger <eric.au...@redhat.com>
Signed-off-by: Yi Liu <yi.l....@intel.com>
---
 hw/vfio/ap.c | 62 ++++++++--------------------------------------------
 1 file changed, 9 insertions(+), 53 deletions(-)

diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index e0dd561e85..286ac638e5 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -50,58 +50,17 @@ struct VFIODeviceOps vfio_ap_ops = {
     .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
 };
 
-static void vfio_ap_put_device(VFIOAPDevice *vapdev)
-{
-    g_free(vapdev->vdev.name);
-    vfio_put_base_device(&vapdev->vdev);
-}
-
-static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
-{
-    GError *gerror = NULL;
-    char *symlink, *group_path;
-    int groupid;
-
-    symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
-    group_path = g_file_read_link(symlink, &gerror);
-    g_free(symlink);
-
-    if (!group_path) {
-        error_setg(errp, "%s: no iommu_group found for %s: %s",
-                   TYPE_VFIO_AP_DEVICE, vapdev->vdev.sysfsdev, 
gerror->message);
-        g_error_free(gerror);
-        return NULL;
-    }
-
-    if (sscanf(basename(group_path), "%d", &groupid) != 1) {
-        error_setg(errp, "vfio: failed to read %s", group_path);
-        g_free(group_path);
-        return NULL;
-    }
-
-    g_free(group_path);
-
-    return vfio_get_group(groupid, &address_space_memory, errp);
-}
-
 static void vfio_ap_realize(DeviceState *dev, Error **errp)
 {
-    int ret;
-    char *mdevid;
-    VFIOGroup *vfio_group;
     APDevice *apdev = AP_DEVICE(dev);
     VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
+    VFIODevice *vbasedev = &vapdev->vdev;
+    int ret;
 
-    vfio_group = vfio_ap_get_group(vapdev, errp);
-    if (!vfio_group) {
-        return;
-    }
-
-    vapdev->vdev.ops = &vfio_ap_ops;
-    vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
-    mdevid = basename(vapdev->vdev.sysfsdev);
-    vapdev->vdev.name = g_strdup_printf("%s", mdevid);
-    vapdev->vdev.dev = dev;
+    vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
+    vbasedev->ops = &vfio_ap_ops;
+    vbasedev->type = VFIO_DEVICE_TYPE_AP;
+    vbasedev->dev = dev;
 
     /*
      * vfio-ap devices operate in a way compatible with discarding of
@@ -111,7 +70,7 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
      */
     vapdev->vdev.ram_block_discard_allowed = true;
 
-    ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp);
+    ret = vfio_attach_device(vbasedev, &address_space_memory, errp);
     if (ret) {
         goto out_get_dev_err;
     }
@@ -119,18 +78,15 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
     return;
 
 out_get_dev_err:
-    vfio_ap_put_device(vapdev);
-    vfio_put_group(vfio_group);
+    vfio_detach_device(vbasedev);
 }
 
 static void vfio_ap_unrealize(DeviceState *dev)
 {
     APDevice *apdev = AP_DEVICE(dev);
     VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
-    VFIOGroup *group = vapdev->vdev.group;
 
-    vfio_ap_put_device(vapdev);
-    vfio_put_group(group);
+    vfio_detach_device(&vapdev->vdev);
 }
 
 static Property vfio_ap_properties[] = {
-- 
2.37.3