[Qemu-devel] [RFC PATCH v2 2/4] hw/vfio/common.c : vfio_get_dev_property

[Baptiste Reynal]

Add a function to handle ioctl VFIO_DEVICE_GET_DEV_PROPERTY
to retrieve properties from a VFIO device.

Signed-off-by: Baptiste Reynal <address@hidden>

---
v1 -> v2:
fix property->length initialization
---
 hw/vfio/common.c              | 32 ++++++++++++++++++++++++++++++++
 include/hw/vfio/vfio-common.h |  2 ++
 2 files changed, 34 insertions(+)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index cf483ff..728afee 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -957,3 +957,35 @@ int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
 
     return vfio_container_do_ioctl(as, groupid, req, param);
 }
+
+struct vfio_dev_property *vfio_get_dev_property(int device, const char *name,
+        unsigned int type)
+{
+    unsigned int length, argsz;
+    struct vfio_dev_property *property = NULL;
+    int ret;
+
+    length = strlen(name) + 1;
+    argsz = sizeof(struct vfio_dev_property) + length;
+    property = malloc(argsz);
+    property->argsz = argsz;
+    property->type = type;
+    property->length = length;
+
+    do {
+        length = property->length;
+        argsz = sizeof(struct vfio_dev_property) + length;
+        property = realloc(property, argsz);
+        property->argsz = argsz;
+        strcpy((char *) property->data, name);
+
+        ret = ioctl(device, VFIO_DEVICE_GET_DEV_PROPERTY, property);
+    } while (length < property->length);
+
+    if (ret) {
+        g_free(property);
+        property = NULL;
+    }
+
+    return property;
+}
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 8ab880a..66e9c5a 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -144,6 +144,8 @@ VFIOGroup *vfio_get_group(int groupid, AddressSpace *as);
 void vfio_put_group(VFIOGroup *group);
 int vfio_get_device(VFIOGroup *group, const char *name,
                     VFIODevice *vbasedev);
+struct vfio_dev_property *vfio_get_dev_property(int device, const char *name,
+        unsigned int type);
 
 extern const MemoryRegionOps vfio_region_ops;
 extern const MemoryListener vfio_memory_listener;
-- 
2.3.0