fix: bitmap format clarification
Signed-off-by: William Henderson <william.henderson@nutanix.com>
diff --git a/docs/vfio-user.rst b/docs/vfio-user.rst
index f67ce86..a0e018c 100644
--- a/docs/vfio-user.rst
+++ b/docs/vfio-user.rst
@@ -1757,6 +1757,9 @@
The data field of the response is identical, except with the bitmap added on
the end at offset 24.
+The bitmap is an array of u64s that holds the output bitmap, with 1 bit
+reporting a *page_size* unit of IOVA.
+
The mapping of IOVA to bits is given by:
``bitmap[(addr - iova)/page_size] & (1ULL << (addr % 64))``
