[RFC v3 14/29] vhost: add vhost_has_limited_iova_range

[Eugenio Pérez]

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 include/hw/virtio/vhost.h |  5 +++++
 hw/virtio/vhost.c         | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 67cedf83da..c97a4c0017 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -88,6 +88,10 @@ struct vhost_dev {
     bool log_enabled;
     bool shadow_vqs_enabled;
     uint64_t log_size;
+    struct {
+        hwaddr first;
+        hwaddr last;
+    } iova_range;
     VhostShadowVirtqueue **shadow_vqs;
     Error *migration_blocker;
     const VhostOps *vhost_ops;
@@ -129,6 +133,7 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const 
int *feature_bits,
 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
                         uint64_t features);
 bool vhost_has_free_slot(void);
+bool vhost_has_limited_iova_range(const struct vhost_dev *hdev);
 
 int vhost_net_set_backend(struct vhost_dev *hdev,
                           struct vhost_vring_file *file);
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 9c9c63345b..333877ca3b 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1386,6 +1386,18 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
         goto fail;
     }
 
+    if (hdev->vhost_ops->vhost_get_iova_range) {
+        r = hdev->vhost_ops->vhost_get_iova_range(hdev,
+                                                 &hdev->iova_range.first,
+                                                 &hdev->iova_range.last);
+        if (unlikely(r != 0)) {
+            error_report("Can't request IOVA range");
+            goto fail;
+        }
+    } else {
+        hdev->iova_range.last = (hwaddr)-1;
+    }
+
     for (i = 0; i < hdev->nvqs; ++i, ++n_initialized_vqs) {
         r = vhost_virtqueue_init(hdev, hdev->vqs + i, hdev->vq_index + i);
         if (r < 0) {
@@ -1622,6 +1634,11 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, 
VirtIODevice *vdev, int n,
     }
 }
 
+bool vhost_has_limited_iova_range(const struct vhost_dev *hdev)
+{
+    return hdev->iova_range.first || hdev->iova_range.last != HWADDR_MAX;
+}
+
 uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
                             uint64_t features)
 {
-- 
2.27.0