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From: Sergio Lopez <slp@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Fam Zheng" <fam@euphon.net>,
	"John G Johnson" <john.g.johnson@oracle.com>,
	kvm@vger.kernel.org, "David Hildenbrand" <david@redhat.com>,
	"Eric Farman" <farman@linux.ibm.com>,
	"Jagannathan Raman" <jag.raman@oracle.com>,
	"Matthew Rosato" <mjrosato@linux.ibm.com>,
	qemu-block@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>,
	"Elena Ufimtseva" <elena.ufimtseva@oracle.com>,
	"Halil Pasic" <pasic@linux.ibm.com>,
	"Christian Borntraeger" <borntraeger@linux.ibm.com>,
	vgoyal@redhat.com, "Thomas Huth" <thuth@redhat.com>,
	"Sergio Lopez" <slp@redhat.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Kevin Wolf" <kwolf@redhat.com>,
	qemu-s390x@nongnu.org, "Cornelia Huck" <cohuck@redhat.com>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Hanna Reitz" <hreitz@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>
Subject: [PATCH v4 4/4] docs: vhost-user: add subsection for non-Linux platforms
Date: Fri,  4 Mar 2022 11:08:54 +0100	[thread overview]
Message-ID: <20220304100854.14829-5-slp@redhat.com> (raw)
In-Reply-To: <20220304100854.14829-1-slp@redhat.com>

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>
 docs/interop/vhost-user.rst | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst
index edc3ad84a3..4dbc84fd00 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

  parent reply	other threads:[~2022-03-04 10:14 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-04 10:08 [PATCH v4 0/4] Enable vhost-user to be used on BSD systems Sergio Lopez
2022-03-04 10:08 ` [PATCH v4 1/4] event_notifier: add event_notifier_get_wfd() Sergio Lopez
2022-03-04 10:08 ` [PATCH v4 2/4] vhost: use wfd on functions setting vring call fd Sergio Lopez
2022-03-04 10:08 ` [PATCH v4 3/4] configure, meson: allow enabling vhost-user on all POSIX systems Sergio Lopez
2022-03-07  9:39   ` Thomas Huth
2022-03-04 10:08 ` Sergio Lopez [this message]
2022-03-07  9:25 ` [PATCH v4 0/4] Enable vhost-user to be used on BSD systems Stefan Hajnoczi

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