"-mem-path" corresponds to "memory-backend-file,share=off" and,
therefore, creates a private COW mapping of the file. For multi-proces
QEMU, we need proper shared file-backed memory.

Let's make that clearer.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 docs/devel/multi-process.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/devel/multi-process.rst b/docs/devel/multi-process.rst
index e4801751f2..4ef539c0b0 100644
--- a/docs/devel/multi-process.rst
+++ b/docs/devel/multi-process.rst
@@ -409,8 +409,9 @@ the initial messages sent to the emulation process is a guest memory
 table. Each entry in this table consists of a file descriptor and size
 that the emulation process can ``mmap()`` to directly access guest
 memory, similar to ``vhost_user_set_mem_table()``. Note guest memory
-must be backed by file descriptors, such as when QEMU is given the
-*-mem-path* command line option.
+must be backed by shared file-backed memory, for example, using
+*-object memory-backend-file,share=on* and setting that memory backend
+as RAM for the machine.
 
 IOMMU operations
 ^^^^^^^^^^^^^^^^
-- 
2.41.0