[RFC PATCH 06/19] tools/vhost-user-rpmb: add boilerplate and initial main

["Alex Bennée" <alex.bennee@linaro.org>]

This adds the boilerplate files for a new vhost-user helper called
vhost-user-rpmb which will support virtio based RPMB (Replay Protected
Memory Block) devices.

This commit just adds the initial boilerplate for building the binary
with the common vhost-user options. As of this commit the only useful
output you get is when running:

  vhost-user-rpmb --help

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tools/vhost-user-rpmb/main.c               | 37 ++++++++++++++++++++++
 MAINTAINERS                                |  5 +++
 tools/meson.build                          |  8 +++++
 tools/vhost-user-rpmb/50-qemu-rpmb.json.in |  5 +++
 tools/vhost-user-rpmb/meson.build          | 11 +++++++
 5 files changed, 66 insertions(+)
 create mode 100644 tools/vhost-user-rpmb/main.c
 create mode 100644 tools/vhost-user-rpmb/50-qemu-rpmb.json.in
 create mode 100644 tools/vhost-user-rpmb/meson.build

diff --git a/tools/vhost-user-rpmb/main.c b/tools/vhost-user-rpmb/main.c
new file mode 100644
index 000000000000..a40a680a74ca
--- /dev/null
+++ b/tools/vhost-user-rpmb/main.c
@@ -0,0 +1,37 @@
+/*
+ * VIRTIO RPMB Emulation via vhost-user
+ *
+ * Copyright (c) 2020 Linaro Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <glib.h>
+
+static gchar *socket_path;
+static gint socket_fd;
+static gboolean print_cap;
+
+static GOptionEntry options[] =
+{
+    { "socket-path", 0, 0, G_OPTION_ARG_FILENAME, &socket_path, "Location of vhost-user Unix domain socket, incompatible with --fd", "PATH" },
+    { "fd", 0, 0, G_OPTION_ARG_INT, &socket_fd, "Specify the file-descriptor of the backend, incompatible with --socket-path", "FD" },
+    { "print-capabilities", 0, 0, G_OPTION_ARG_NONE, &print_cap, "Output to stdout the backend capabilities in JSON format and exit", NULL},
+    { NULL }
+};
+
+int main (int argc, char *argv[])
+{
+    GError *error = NULL;
+    GOptionContext *context;
+
+    context = g_option_context_new ("vhost-user-rpmb - vhost-user emulation of RPBM device");
+    g_option_context_add_main_entries (context, options, "vhost-user-rpmb");
+    if (!g_option_context_parse (context, &argc, &argv, &error))
+    {
+        g_print ("option parsing failed: %s\n", error->message);
+        exit (1);
+    }
+
+
+}
diff --git a/MAINTAINERS b/MAINTAINERS
index 3d17cad19aa0..e325c1024a33 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1873,6 +1873,11 @@ F: hw/virtio/virtio-mem-pci.h
 F: hw/virtio/virtio-mem-pci.c
 F: include/hw/virtio/virtio-mem.h
 
+virtio-rpmb
+M: Alex Bennée <alex.bennee@linaro.org>
+S: Supported
+F: tools/vhost-user-rpmb/*
+
 nvme
 M: Keith Busch <kbusch@kernel.org>
 M: Klaus Jensen <its@irrelevant.dk>
diff --git a/tools/meson.build b/tools/meson.build
index 513bd2ff4fd2..408048c6357c 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -8,3 +8,11 @@ have_virtiofsd = (have_system and
 if have_virtiofsd
   subdir('virtiofsd')
 endif
+
+have_virtiorpmb = (have_system and
+    have_tools and
+    'CONFIG_LINUX' in config_host)
+
+if have_virtiorpmb
+  subdir('vhost-user-rpmb')
+endif
diff --git a/tools/vhost-user-rpmb/50-qemu-rpmb.json.in b/tools/vhost-user-rpmb/50-qemu-rpmb.json.in
new file mode 100644
index 000000000000..2b033cda567c
--- /dev/null
+++ b/tools/vhost-user-rpmb/50-qemu-rpmb.json.in
@@ -0,0 +1,5 @@
+{
+  "description": "QEMU vhost-user-rpmb",
+  "type": "block",
+  "binary": "@libexecdir@/vhost-user-rpmb"
+}
diff --git a/tools/vhost-user-rpmb/meson.build b/tools/vhost-user-rpmb/meson.build
new file mode 100644
index 000000000000..e0df1b69a3fb
--- /dev/null
+++ b/tools/vhost-user-rpmb/meson.build
@@ -0,0 +1,11 @@
+executable('vhost-user-rpmb', files(
+  'main.c'),
+  dependencies: [glib],
+  link_with: [libvhost_user],
+  install: true,
+  install_dir: get_option('libexecdir'))
+
+configure_file(input: '50-qemu-rpmb.json.in',
+               output: '50-qemu-rpmb.json',
+               configuration: config_host,
+               install_dir: qemu_datadir / 'vhost-user')
-- 
2.20.1