samples: drivers: virtualization: xen: add virtio_backend

backend_sample

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

samples/drivers/virtualization/xen_virtio_backend/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(xen_virtio_backend)
+
+target_sources(app PRIVATE src/main.c)

samples/drivers/virtualization/xen_virtio_backend/README.rst

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+.. zephyr:code-sample:: xen_virtio_backend
+   :name: Xen VirtIO Backend
+
+   Print "Hello World" to the console.
+
+Overview
+********
+
+A simple sample that can be used with any :ref:`supported board <boards>` and
+prints "Hello World" to the console.
+
+Building and Running
+********************
+
+This application can be built and executed on QEMU as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/virtualization/xen/virtio_backend
+   :host-os: unix
+   :board: qemu_x86
+   :goals: run
+   :compact:
+
+To build for another board, change "qemu_x86" above to that board's name.
+
+Sample Output
+=============
+
+.. code-block:: console
+
+    Hello World! x86
+
+Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.

samples/drivers/virtualization/xen_virtio_backend/boards/xenvm.overlay

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+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	virtio-mmio-backend@10004000 {
+		reg = <0x0 0x10004000 0x0 0x200>;
+		compatible = "xen,virtio-mmio-backend";
+	};
+
+};

samples/drivers/virtualization/xen_virtio_backend/boards/xenvm_xenvm_gicv3.overlay

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+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	virtio-mmio-backend@10004000 {
+		reg = <0x0 0x10004000 0x0 0x200>;
+		interrupts = <GIC_SPI 42 IRQ_TYPE_EDGE IRQ_DEFAULT_PRIORITY>;
+		compatible = "xen,virtio-mmio-backend";
+	};
+
+};

samples/drivers/virtualization/xen_virtio_backend/prj.conf

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+CONFIG_VIRTIO=y
+CONFIG_LOG=y
+CONFIG_HEAP_MEM_POOL_SIZE=1048576
+CONFIG_LOG_MODE_IMMEDIATE=y

samples/drivers/virtualization/xen_virtio_backend/sample.yaml

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+sample:
+  description: Hello World sample, the simplest Zephyr
+    application
+  name: hello world
+common:
+  min_ram: 2
+  min_flash: 16
+  tags: introduction
+  integration_platforms:
+    - native_sim
+  harness: console
+  harness_config:
+    type: one_line
+    regex:
+      - "Hello World! (.*)"
+tests:
+  sample.virtualization.xen.virtio_backend:
+    tags: introduction

samples/drivers/virtualization/xen_virtio_backend/src/main.c

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+/*
+ * Copyright (c) 2025 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+
+int main(void)
+{
+	while (1) {
+		k_yield();
+	}
+
+	return 0;
+}