mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

docs: vhost-user: add subsection for non-Linux platforms

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

Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20220304100854.14829-5-slp@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Sergio Lopez 2022-03-04 11:08:54 +01:00 committed by Michael S. Tsirkin
parent eb9baecdb3
commit b51082905f
1 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
docs/interop/vhost-user.rst
View File

@ -38,6 +38,26 @@ 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 it
is supported on any platform that provides the following features:
- A way for requesting shared memory represented by a file descriptor
so it can be passed over a UNIX domain socket and then mapped by the
other process.
- AF_UNIX sockets with SCM_RIGHTS, so QEMU and the other process can
exchange messages through it, including ancillary data when needed.
- Either eventfd or pipe/pipe2. On platforms where eventfd is not
available, QEMU will automatically fall back to pipe2 or, as a last
resort, pipe. Each file descriptor will be used for receiving or
sending events by reading or writing (respectively) an 8-byte value
to the corresponding it. The 8-value itself has no meaning and
should not be interpreted.
Message Specification
=====================