hw/virtio: Extract QMP related code virtio-qmp.c

The monitor decoders are the only functions using the CONFIG_xxx
definitions declared in the target specific CONFIG_DEVICES header.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221213111707.34921-7-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <a class="moz-txt-link-rfc2396E" href="mailto:philmd@linaro.org">&lt;philmd@linaro.org&gt;</a>

hw/virtio/meson.build

@@ -5,7 +5,7 @@ softmmu_virtio_ss.add(when: 'CONFIG_VIRTIO_MMIO', if_true: files('virtio-mmio.c'
 
 specific_virtio_ss = ss.source_set()
 specific_virtio_ss.add(files('virtio.c'))
-specific_virtio_ss.add(files('virtio-config-io.c'))
+specific_virtio_ss.add(files('virtio-config-io.c', 'virtio-qmp.c'))
 
 if have_vhost
   specific_virtio_ss.add(files('vhost.c', 'vhost-backend.c', 'vhost-iova-tree.c'))

hw/virtio/virtio-qmp.h

@@ -0,0 +1,20 @@
+/*
+ * Virtio QMP helpers
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef HW_VIRTIO_QMP_H
+#define HW_VIRTIO_QMP_H
+
+#include "qapi/qapi-types-virtio.h"
+
+VirtioDeviceStatus *qmp_decode_status(uint8_t bitmap);
+VhostDeviceProtocols *qmp_decode_protocols(uint64_t bitmap);
+VirtioDeviceFeatures *qmp_decode_features(uint16_t device_id, uint64_t bitmap);
+
+#endif