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| author | Sergio Lopez <slp@redhat.com> | 2022-03-04 11:08:54 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-03-06 06:19:47 -0500 |
| commit | b51082905faededb32f57e380446e919a42b9017 (patch) | |
| tree | e2d2f0ea096c925365a0e57718bc7c98465d33b5 /docs | |
| parent | eb9baecdb3aef37ef4952bd4014f14c9d057fa18 (diff) | |
| download | qemu-b51082905faededb32f57e380446e919a42b9017.zip qemu-b51082905faededb32f57e380446e919a42b9017.tar.gz qemu-b51082905faededb32f57e380446e919a42b9017.tar.bz2 | |
docs: vhost-user: add subsection for non-Linux platforms
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/interop/vhost-user.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index edc3ad8..4dbc84f 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -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 ===================== |