[PATCH v2 7/8] tests/avocado: ppc add hypervisor tests

[Nicholas Piggin <npiggin@gmail.com>]

The powernv and pseries machines both provide hypervisor facilities
that are supported by KVM. This is a large and complicated set of
features that don't get much system-level testing in ppc tests.

Add a new test case for these which runs QEMU KVM inside the target.
This downloads an Alpine VM image, boots it and downloads and installs
the qemu package, then boots a virtual machine under it, re-using the
original Alpine VM image.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 MAINTAINERS                   |   1 +
 tests/avocado/ppc_hv_tests.py | 203 ++++++++++++++++++++++++++++++++++
 2 files changed, 204 insertions(+)
 create mode 100644 tests/avocado/ppc_hv_tests.py

diff --git a/MAINTAINERS b/MAINTAINERS
index b406fb20c0..bf41ac61c8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1523,6 +1523,7 @@ F: tests/qtest/libqos/*spapr*
 F: tests/qtest/rtas*
 F: tests/qtest/libqos/rtas*
 F: tests/avocado/ppc_pseries.py
+F: tests/avocado/ppc_hv_tests.py
 
 PowerNV (Non-Virtualized)
 M: Cédric Le Goater <clg@kaod.org>
diff --git a/tests/avocado/ppc_hv_tests.py b/tests/avocado/ppc_hv_tests.py
new file mode 100644
index 0000000000..2f80d0d176
--- /dev/null
+++ b/tests/avocado/ppc_hv_tests.py
@@ -0,0 +1,203 @@
+# Tests that specifically try to exercise hypervisor features of the
+# target machines. powernv supports the Power hypervisor ISA, and
+# pseries supports the nested-HV hypervisor spec.
+#
+# Copyright (c) 2023 IBM Corporation
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+
+from avocado import skipIf, skipUnless
+from avocado.utils import archive
+from avocado_qemu import QemuSystemTest
+from avocado_qemu import wait_for_console_pattern, exec_command
+import os
+import time
+import subprocess
+
+deps = ["xorriso"] # dependent tools needed in the test setup/box.
+
+def which(tool):
+    """ looks up the full path for @tool, returns None if not found
+        or if @tool does not have executable permissions.
+    """
+    paths=os.getenv('PATH')
+    for p in paths.split(os.path.pathsep):
+        p = os.path.join(p, tool)
+        if os.path.exists(p) and os.access(p, os.X_OK):
+            return p
+    return None
+
+def missing_deps():
+    """ returns True if any of the test dependent tools are absent.
+    """
+    for dep in deps:
+        if which(dep) is None:
+            return True
+    return False
+
+# Alpine is a light weight distro that supports QEMU. These tests boot
+# that on the machine then run a QEMU guest inside it in KVM mode,
+# that runs the same Alpine distro image.
+# QEMU packages are downloaded and installed on each test. That's not a
+# large download, but it may be more polite to create qcow2 image with
+# QEMU already installed and use that.
+@skipUnless(os.getenv('AVOCADO_ALLOW_LARGE_STORAGE'), 'storage limited')
+@skipUnless(os.getenv('SPEED') == 'slow', 'runtime limited')
+@skipIf(missing_deps(), 'dependencies (%s) not installed' % ','.join(deps))
+class HypervisorTest(QemuSystemTest):
+
+    timeout = 1000
+    KERNEL_COMMON_COMMAND_LINE = 'printk.time=0 console=hvc0 '
+    panic_message = 'Kernel panic - not syncing'
+    good_message = 'VFS: Cannot open root device'
+
+    def extract_from_iso(self, iso, path):
+        """
+        Extracts a file from an iso file into the test workdir
+
+        :param iso: path to the iso file
+        :param path: path within the iso file of the file to be extracted
+        :returns: path of the extracted file
+        """
+        filename = os.path.basename(path)
+
+        cwd = os.getcwd()
+        os.chdir(self.workdir)
+
+        with open(filename, "w") as outfile:
+            cmd = "xorriso -osirrox on -indev %s -cpx %s %s" % (iso, path, filename)
+            subprocess.run(cmd.split(),
+                           stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+        os.chdir(cwd)
+
+        # Return complete path to extracted file.  Because callers to
+        # extract_from_iso() specify 'path' with a leading slash, it is
+        # necessary to use os.path.relpath() as otherwise os.path.join()
+        # interprets it as an absolute path and drops the self.workdir part.
+        return os.path.normpath(os.path.join(self.workdir, filename))
+
+    def setUp(self):
+        super().setUp()
+
+        iso_url = ('https://dl-cdn.alpinelinux.org/alpine/v3.18/releases/ppc64le/alpine-standard-3.18.4-ppc64le.iso')
+
+        # Alpine use sha256 so I recalculated this myself
+        iso_sha256 = 'c26b8d3e17c2f3f0fed02b4b1296589c2390e6d5548610099af75300edd7b3ff'
+        iso_path = self.fetch_asset(iso_url, asset_hash=iso_sha256,
+                                    algorithm = "sha256")
+
+        self.iso_path = iso_path
+        self.vmlinuz = self.extract_from_iso(iso_path, '/boot/vmlinuz-lts')
+        self.initramfs = self.extract_from_iso(iso_path, '/boot/initramfs-lts')
+
+    def do_start_alpine(self):
+        self.vm.set_console()
+        kernel_command_line = self.KERNEL_COMMON_COMMAND_LINE
+        self.vm.add_args("-kernel", self.vmlinuz)
+        self.vm.add_args("-initrd", self.initramfs)
+        self.vm.add_args("-smp", "4", "-m", "2g")
+        self.vm.add_args("-drive", f"file={self.iso_path},format=raw,if=none,id=drive0")
+
+        self.vm.launch()
+        wait_for_console_pattern(self, 'Welcome to Alpine Linux 3.18')
+        exec_command(self, 'root')
+        wait_for_console_pattern(self, 'localhost login:')
+        wait_for_console_pattern(self, 'You may change this message by editing /etc/motd.')
+        exec_command(self, 'setup-alpine -qe')
+        wait_for_console_pattern(self, 'localhost:~#')
+
+    def do_stop_alpine(self):
+        exec_command(self, 'poweroff')
+        wait_for_console_pattern(self, 'alpine:~#')
+        self.vm.wait()
+
+    def do_setup_kvm(self):
+        exec_command(self, 'echo http://dl-cdn.alpinelinux.org/alpine/v3.18/main > /etc/apk/repositories')
+        wait_for_console_pattern(self, 'alpine:~#')
+        exec_command(self, 'echo http://dl-cdn.alpinelinux.org/alpine/v3.18/community >> /etc/apk/repositories')
+        wait_for_console_pattern(self, 'alpine:~#')
+        exec_command(self, 'apk update')
+        wait_for_console_pattern(self, 'alpine:~#')
+        exec_command(self, 'apk add qemu-system-ppc64')
+        wait_for_console_pattern(self, 'alpine:~#')
+        exec_command(self, 'modprobe kvm-hv')
+        wait_for_console_pattern(self, 'alpine:~#')
+
+    # This uses the host's block device as the source file for guest block
+    # device for install media. This is a bit hacky but allows reuse of the
+    # iso without having a passthrough filesystem configured.
+    def do_test_kvm(self, hpt=False):
+        if hpt:
+            append = 'disable_radix'
+        else:
+            append = ''
+        exec_command(self, 'qemu-system-ppc64 -nographic -smp 2 -m 1g '
+                           '-machine pseries,x-vof=on,accel=kvm '
+                           '-machine cap-cfpc=broken,cap-sbbc=broken,'
+                                    'cap-ibs=broken,cap-ccf-assist=off '
+                           '-drive file=/dev/nvme0n1,format=raw,readonly=on '
+                           '-initrd /media/nvme0n1/boot/initramfs-lts '
+                           '-kernel /media/nvme0n1/boot/vmlinuz-lts '
+                           '-append \'usbcore.nousb ' + append + '\'')
+        # Alpine 3.18 kernel seems to crash in XHCI USB driver.
+        wait_for_console_pattern(self, 'Welcome to Alpine Linux 3.18')
+        exec_command(self, 'root')
+        wait_for_console_pattern(self, 'localhost login:')
+        wait_for_console_pattern(self, 'You may change this message by editing /etc/motd.')
+        exec_command(self, 'poweroff >& /dev/null')
+        wait_for_console_pattern(self, 'localhost:~#')
+        wait_for_console_pattern(self, 'reboot: Power down')
+        time.sleep(1)
+        exec_command(self, '') # console has strange issue after qemu exit
+        exec_command(self, 'reset')
+        exec_command(self, 'echo VM finished')
+        wait_for_console_pattern(self, 'VM finished')
+
+    def test_hv_pseries(self):
+        """
+        :avocado: tags=arch:ppc64
+        :avocado: tags=machine:pseries
+        :avocado: tags=accel:tcg
+        """
+        self.require_accelerator("tcg")
+        self.vm.add_args("-accel", "tcg,thread=multi")
+        self.vm.add_args('-device', 'nvme,serial=1234,drive=drive0')
+        self.vm.add_args("-machine", "x-vof=on,cap-nested-hv=on")
+        self.do_start_alpine()
+        self.do_setup_kvm()
+        self.do_test_kvm()
+        self.do_stop_alpine()
+
+    def test_hv_pseries_kvm(self):
+        """
+        :avocado: tags=arch:ppc64
+        :avocado: tags=machine:pseries
+        :avocado: tags=accel:kvm
+        """
+        self.require_accelerator("kvm")
+        self.vm.add_args("-accel", "kvm")
+        self.vm.add_args('-device', 'nvme,serial=1234,drive=drive0')
+        self.vm.add_args("-machine", "x-vof=on,cap-nested-hv=on")
+        self.do_start_alpine()
+        self.do_setup_kvm()
+        self.do_test_kvm()
+        self.do_stop_alpine()
+
+    def test_hv_powernv(self):
+        """
+        :avocado: tags=arch:ppc64
+        :avocado: tags=machine:powernv
+        :avocado: tags=accel:tcg
+        """
+        self.require_accelerator("tcg")
+        self.vm.add_args("-accel", "tcg,thread=multi")
+        self.vm.add_args('-device', 'nvme,bus=pcie.2,addr=0x0,serial=1234,drive=drive0',
+                         '-device', 'e1000e,netdev=net0,mac=C0:FF:EE:00:00:02,bus=pcie.0,addr=0x0',
+                         '-netdev', 'user,id=net0,hostfwd=::20022-:22,hostname=alpine')
+        self.do_start_alpine()
+        self.do_setup_kvm()
+        self.do_test_kvm()
+        self.do_test_kvm(True)
+        self.do_stop_alpine()
-- 
2.42.0