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[v2,14/21] system/iommufd: Introduce iommufd_builtin() helper

Message ID 20250308230917.18907-15-philmd@linaro.org
State New
Headers show
Series hw/vfio: Build various objects once | expand

Commit Message

Philippe Mathieu-Daudé March 8, 2025, 11:09 p.m. UTC 
iommufd_builtin() can be used to check at runtime whether
the IOMMUFD feature is built in a qemu-system binary.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 docs/devel/vfio-iommufd.rst | 2 +-
 include/system/iommufd.h    | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/docs/devel/vfio-iommufd.rst b/docs/devel/vfio-iommufd.rst
index 3d1c11f175e..08882094eee 100644
--- a/docs/devel/vfio-iommufd.rst
+++ b/docs/devel/vfio-iommufd.rst
@@ -88,7 +88,7 @@  Step 2: configure QEMU
 ----------------------
 
 Interactions with the ``/dev/iommu`` are abstracted by a new iommufd
-object (compiled in with the ``CONFIG_IOMMUFD`` option).
+object (which availability can be checked at runtime using ``iommufd_builtin()``).
 
 Any QEMU device (e.g. VFIO device) wishing to use ``/dev/iommu`` must
 be linked with an iommufd object. It gets a new optional property
diff --git a/include/system/iommufd.h b/include/system/iommufd.h
index cbab75bfbf6..3fedf8cfb63 100644
--- a/include/system/iommufd.h
+++ b/include/system/iommufd.h
@@ -63,4 +63,10 @@  bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,
                                       Error **errp);
 
 #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
+
+static inline bool iommufd_builtin(void)
+{
+    return type_is_registered(TYPE_IOMMUFD_BACKEND);
+}
+
 #endif