support/testing/tests/package/test_xvisor.py: new runtime test

This is a basic test for Xvisor RISC-V 64bit. It is running few
management and status commands. It does not start a Linux kernel.

RISC-V 64bit was chosen for this test because it was the simplest
solution to run xvisor in a qemu emulator.

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e14380b3c4c3d5e037662c45b2cf90056056920a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1876,6 +1876,7 @@ F:	support/testing/tests/package/test_weston.py
 F:	support/testing/tests/package/test_weston/
 F:	support/testing/tests/package/test_xfsprogs.py
 F:	support/testing/tests/package/test_xfsprogs/
+F:	support/testing/tests/package/test_xvisor.py
 F:	support/testing/tests/package/test_xz.py
 F:	support/testing/tests/package/test_z3.py
 F:	support/testing/tests/package/test_z3/

support/testing/tests/package/test_xvisor.py

@@ -0,0 +1,131 @@
+import os
+import re
+
+import infra.basetest
+
+
+class TestXvisor(infra.basetest.BRTest):
+    # RISC-V 64bit is the "simplest" configuration to run
+    # Xvisor into QEmu.
+    config = \
+        """
+        BR2_riscv=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_PACKAGE_XVISOR=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        BR2_TARGET_OPENSBI=y
+        BR2_TARGET_OPENSBI_CUSTOM_VERSION=y
+        BR2_TARGET_OPENSBI_CUSTOM_VERSION_VALUE="1.5"
+        BR2_TARGET_OPENSBI_PLAT="generic"
+        BR2_PACKAGE_HOST_QEMU=y
+        BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
+        """
+    xvisor_prompt = "XVisor# "
+
+    def expect_xvisor_prompt(self, timeout=-1):
+        self.emulator.qemu.expect(self.xvisor_prompt, timeout=timeout)
+
+    def run_xvisor_cmd(self, cmd, timeout=-1):
+        exit_code = 0
+        if timeout != -1:
+            timeout *= self.emulator.timeout_multiplier
+        self.emulator.qemu.sendline(cmd)
+        self.expect_xvisor_prompt(timeout)
+        output = self.emulator.qemu.before.replace("\r\r", "\r").splitlines()[1:]
+        # Some Xvisor commands (like "sleep") might not
+        # produce any output
+        if len(output) > 0:
+            last_line = output[-1]
+        else:
+            last_line = ""
+        if last_line.startswith("Error:"):
+            match = re.search(last_line, r"code (-?\d)")
+            if match is None:
+                exit_code = -1
+            else:
+                exit_code = int(match.group(1))
+
+        return output, exit_code
+
+    def assertXvRunOk(self, cmd, timeout=-1):
+        out, exit_code = self.run_xvisor_cmd(cmd, timeout)
+        self.assertEqual(
+            exit_code,
+            0,
+            "\nFailed to run xvisor command: {}\noutput was:\n{}".format(
+                cmd, '  '+'\n  '.join(out))
+        )
+
+    def test_run(self):
+        opensbi = os.path.join(self.builddir, "images", "fw_jump.bin")
+        xvisor = os.path.join(self.builddir, "images", "vmm.bin")
+        initrd = os.path.join(self.builddir, "images", "rootfs.cpio")
+
+        self.emulator.boot(arch="riscv64",
+                           kernel=xvisor,
+                           options=["-M", "virt", "-cpu", "rv64", "-m", "256M",
+                                    "-bios", opensbi, "-initrd", initrd])
+
+        # There is no emulator.login(), since we start directly in
+        # Xvisor prompt.
+        self.expect_xvisor_prompt()
+
+        # Check Xvisor version.
+        output, exit_code = self.run_xvisor_cmd("version")
+        self.assertEqual(exit_code, 0)
+        self.assertTrue(output[0].startswith("Xvisor"))
+
+        # Check a basic echo.
+        test_str = "Hello Buildroot!"
+        output, exit_code = self.run_xvisor_cmd("echo " + test_str)
+        self.assertEqual(exit_code, 0)
+        self.assertEqual(output[0].strip(), test_str)
+
+        # Check a nonexisting command fails.
+        _, exit_code = self.run_xvisor_cmd("bad_command")
+        self.assertNotEqual(exit_code, 0)
+
+        # Check an error of a valid command.
+        _, exit_code = self.run_xvisor_cmd("vfs ls /nodir")
+        self.assertNotEqual(exit_code, 0)
+
+        # We mount the initrd...
+        self.assertXvRunOk("vfs mount initrd /")
+
+        # Check we see an existing file/symlink "os-release" in
+        # "/etc", from our mounted initrd.
+        output, exit_code = self.run_xvisor_cmd("vfs ls /etc")
+        self.assertEqual(exit_code, 0)
+        self.assertIn("os-release", "\n".join(output))
+
+        # Check the word "Buildroot" is in the /etc/issue file.
+        output, exit_code = self.run_xvisor_cmd("vfs cat /etc/issue")
+        self.assertEqual(exit_code, 0)
+        self.assertIn("Buildroot", "\n".join(output))
+
+        # Check qemu is seen in host info.
+        output, exit_code = self.run_xvisor_cmd("host info")
+        self.assertEqual(exit_code, 0)
+        self.assertIn("qemu", "\n".join(output))
+
+        # Run a batch of status commands...
+        cmds = [
+            "blockdev list",
+            "rbd list",
+            "module info 0",
+            "wallclock get_time",
+            "heap info",
+            "thread list",
+            "vcpu list",
+            "vcpu dumpreg 0",
+            "devtree node show /",
+            "host cpu info",
+            "host ram info",
+            "host resources",
+            "host bus_list",
+            "host bus_device_list platform"
+        ]
+
+        for cmd in cmds:
+            self.assertXvRunOk(cmd)