From a9095850da8dd4ea3fdb725cb7f79118144e22fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Thu, 21 Jul 2022 15:39:27 +0200
Subject: [PATCH 22/32] vhost-net-vdpa: add stubs for when no virtio-net device
 is present
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 108: Net Control Virtqueue shadow Support
RH-Commit: [22/27] a2b25a805bb06094a5fab27ce8f82bee12a9fcb5 (eperezmartin/qemu-kvm)
RH-Bugzilla: 1939363
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>

Bugzilla: https://bugzilla.redhat.com/1939363

Upstream Status: git://git.qemu.org/qemu.git

commit 94c643732dc110d04bbdf0eb43c41bce23b3593e
Author: Eugenio Pérez <eperezma@redhat.com>
Date:   Wed Jul 20 08:59:41 2022 +0200

    vhost-net-vdpa: add stubs for when no virtio-net device is present

    net/vhost-vdpa.c will need functions that are declared in
    vhost-shadow-virtqueue.c, that needs functions of virtio-net.c.

    Copy the vhost-vdpa-stub.c code so
    only the constructor net_init_vhost_vdpa needs to be defined.

    Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
    Signed-off-by: Jason Wang <jasowang@redhat.com>

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 net/meson.build       |  3 ++-
 net/vhost-vdpa-stub.c | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 net/vhost-vdpa-stub.c

diff --git a/net/meson.build b/net/meson.build
index c965e83b26..116a9e7cbb 100644
--- a/net/meson.build
+++ b/net/meson.build
@@ -41,7 +41,8 @@ endif
 softmmu_ss.add(when: 'CONFIG_POSIX', if_true: files(tap_posix))
 softmmu_ss.add(when: 'CONFIG_WIN32', if_true: files('tap-win32.c'))
 if have_vhost_net_vdpa
-  softmmu_ss.add(files('vhost-vdpa.c'))
+  softmmu_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-vdpa.c'), if_false: files('vhost-vdpa-stub.c'))
+  softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-vdpa-stub.c'))
 endif
 
 subdir('can')
diff --git a/net/vhost-vdpa-stub.c b/net/vhost-vdpa-stub.c
new file mode 100644
index 0000000000..1732ed2443
--- /dev/null
+++ b/net/vhost-vdpa-stub.c
@@ -0,0 +1,21 @@
+/*
+ * vhost-vdpa-stub.c
+ *
+ * Copyright (c) 2022 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "clients.h"
+#include "net/vhost-vdpa.h"
+#include "qapi/error.h"
+
+int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
+                        NetClientState *peer, Error **errp)
+{
+    error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
+    return -1;
+}
-- 
2.31.1