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-rw-r--r--qemu-options.hx7
1 files changed, 7 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx
index aa44b0e34a..075f4be2e3 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1231,6 +1231,13 @@ SRST
     ``aw-bits=val`` (val between 32 and 64, default depends on machine)
         This decides the address width of the IOVA address space.
 
+``-device arm-smmuv3,primary-bus=id``
+    This is only supported by ``-machine virt`` (ARM).
+
+    ``primary-bus=id``
+        Accepts either the default root complex (pcie.0) or a
+        pxb-pcie based root complex.
+
 ERST
 
 DEF("name", HAS_ARG, QEMU_OPTION_name,