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[PATCH v3 4/4] docs: vhost-user: add subsection for non-Linux platforms

From: Sergio Lopez
Subject: [PATCH v3 4/4] docs: vhost-user: add subsection for non-Linux platforms
Date: Thu, 3 Mar 2022 12:59:11 +0100

Add a section explaining how vhost-user is supported on platforms
other than Linux.

Signed-off-by: Sergio Lopez <slp@redhat.com>
 docs/interop/vhost-user.rst | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst
index edc3ad84a3..590a626b92 100644
--- a/docs/interop/vhost-user.rst
+++ b/docs/interop/vhost-user.rst
@@ -38,6 +38,24 @@ conventions <backend_conventions>`.
 *Master* and *slave* can be either a client (i.e. connecting) or
 server (listening) in the socket communication.
+Support for platforms other than Linux
+While vhost-user was initially developed targeting Linux, nowadays is
+supported on any platform that provides the following features:
+- The ability to share a mapping injected into the guest between
+  multiple processes, so both QEMU and the vhost-user daemon servicing
+  the device can access simultaneously the memory regions containing
+  the virtqueues and the data associated with each request.
+- AF_UNIX sockets with SCM_RIGHTS, so QEMU can communicate with the
+  vhost-user daemon and send it file descriptors when needed.
+- Either eventfd or pipe/pipe2. On platforms where eventfd is not
+  available, QEMU will automatically fallback to pipe2 or, as a last
+  resort, pipe.
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