From: Eric Auger <eric.auger@redhat.com>

Introduce a new HostIOMMUDevice callback that allows to
retrieve the usable IOVA ranges.

Implement this callback in the legacy VFIO and IOMMUFD VFIO
host iommu devices. This relies on the VFIODevice agent's
base container iova_ranges resource.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/sysemu/host_iommu_device.h |  8 ++++++++
 hw/vfio/container.c                | 16 ++++++++++++++++
 hw/vfio/iommufd.c                  | 16 ++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
index 3e5f058e7ba80491eae04dc73c6957f7269150cf..40e0fa13efb5c023bc9b46fc99bf553cb93adf24 100644
--- a/include/sysemu/host_iommu_device.h
+++ b/include/sysemu/host_iommu_device.h
@@ -80,6 +80,14 @@ struct HostIOMMUDeviceClass {
      * i.e., HOST_IOMMU_DEVICE_CAP_AW_BITS.
      */
     int (*get_cap)(HostIOMMUDevice *hiod, int cap, Error **errp);
+    /**
+     * @get_iova_ranges: Return the list of usable iova_ranges along with
+     * @hiod Host IOMMU device
+     *
+     * @hiod: handle to the host IOMMU device
+     * @errp: error handle
+     */
+    GList* (*get_iova_ranges)(HostIOMMUDevice *hiod, Error **errp);
 };
 
 /*
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index b728b978a26d49b5a2895fd4d1add8f0a57787ad..c48749c089a67ee4d0e6b8dd975562e2938500cd 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1164,12 +1164,28 @@ static int hiod_legacy_vfio_get_cap(HostIOMMUDevice *hiod, int cap,
     }
 }
 
+static GList *
+hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
+{
+    VFIODevice *vdev = hiod->agent;
+    GList *l = NULL;
+
+    g_assert(vdev);
+
+    if (vdev->bcontainer) {
+        l = g_list_copy(vdev->bcontainer->iova_ranges);
+    }
+
+    return l;
+}
+
 static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
 {
     HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
 
     hioc->realize = hiod_legacy_vfio_realize;
     hioc->get_cap = hiod_legacy_vfio_get_cap;
+    hioc->get_iova_ranges = hiod_legacy_vfio_get_iova_ranges;
 };
 
 static const TypeInfo types[] = {
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index dbdae1adbb66f9c8547659320ce4436825efe1a1..e502081c2ad9eda31769176f875fef60a77e2b43 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -645,11 +645,27 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
     return true;
 }
 
+static GList *
+hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
+{
+    VFIODevice *vdev = hiod->agent;
+    GList *l = NULL;
+
+    g_assert(vdev);
+
+    if (vdev->bcontainer) {
+        l = g_list_copy(vdev->bcontainer->iova_ranges);
+    }
+
+    return l;
+}
+
 static void hiod_iommufd_vfio_class_init(ObjectClass *oc, void *data)
 {
     HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
 
     hiodc->realize = hiod_iommufd_vfio_realize;
+    hiodc->get_iova_ranges = hiod_iommufd_vfio_get_iova_ranges;
 };
 
 static const TypeInfo types[] = {
-- 
2.45.2