[PATCH v2 07/10] backends/iommufd: Implement get_host_iommu_info() callback

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

It calls iommufd_backend_get_device_info() to get host IOMMU
related information.

Define a common structure HIOD_IOMMUFD_INFO to describe the info
returned from kernel. Currently only vtd, but easy to add arm smmu
when kernel supports.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd.h |  7 +++++++
 backends/iommufd.c       | 17 +++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index fa1a866237..44ec1335b2 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -39,6 +39,13 @@ int iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
                                     enum iommu_hw_info_type *type,
                                     void *data, uint32_t len, Error **errp);
 
+typedef struct HIOD_IOMMUFD_INFO {
+    enum iommu_hw_info_type type;
+    union {
+        struct iommu_hw_info_vtd vtd;
+    } data;
+} HIOD_IOMMUFD_INFO;
+
 #define TYPE_HIOD_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
 OBJECT_DECLARE_TYPE(HIODIOMMUFD, HIODIOMMUFDClass, HIOD_IOMMUFD)
 
diff --git a/backends/iommufd.c b/backends/iommufd.c
index 559affa9ec..1e9c469e65 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -240,8 +240,25 @@ void hiod_iommufd_init(HIODIOMMUFD *idev, IOMMUFDBackend *iommufd,
     idev->devid = devid;
 }
 
+static int hiod_iommufd_get_host_iommu_info(HostIOMMUDevice *hiod,
+                                            void *data, uint32_t len,
+                                            Error **errp)
+{
+    HIODIOMMUFD *idev = HIOD_IOMMUFD(hiod);
+    HIOD_IOMMUFD_INFO *info = data;
+
+    assert(sizeof(HIOD_IOMMUFD_INFO) <= len);
+
+    return iommufd_backend_get_device_info(idev->iommufd, idev->devid,
+                                           &info->type, &info->data,
+                                           sizeof(info->data), errp);
+}
+
 static void hiod_iommufd_class_init(ObjectClass *oc, void *data)
 {
+    HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
+
+    hiodc->get_host_iommu_info = hiod_iommufd_get_host_iommu_info;
 }
 
 static const TypeInfo types[] = {
-- 
2.34.1