tests/avocado: Test Xen guest support under KVM

Exercise guests with a few different modes for interrupt delivery. In
particular we want to cover:

 • Xen event channel delivery via GSI to the I/O APIC
 • Xen event channel delivery via GSI to the i8259 PIC
 • MSIs routed to PIRQ event channels
 • GSIs routed to PIRQ event channels

As well as some variants of normal non-Xen stuff like MSI to vAPIC and
PCI INTx going to the I/O APIC and PIC, which ought to still work even
in Xen mode.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>

diff --git a/tests/avocado/kvm_xen_guest.py b/tests/avocado/kvm_xen_guest.py
new file mode 100644 (file)
index 0000000..6978c93
--- /dev/null
+++ b/tests/avocado/kvm_xen_guest.py
@@ -0,0 +1,145 @@
+# KVM Xen guest functional tests
+#
+# Copyright © 2021 Red Hat, Inc.
+# Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Author:
+#  David Woodhouse <dwmw2@infradead.org>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later.  See the COPYING file in the top-level directory.
+import os
+
+from avocado_qemu import LinuxTest
+
+class KVMXenGuest(LinuxTest):
+    """
+    :avocado: tags=arch:x86_64
+    :avocado: tags=distro:fedora
+    :avocado: tags=distro_version:34
+    :avocado: tags=machine:q35
+    :avocado: tags=accel:kvm
+    :avocado: tags=kvm_xen_guest
+    """
+
+    kernel_path = None
+    initrd_path = None
+    kernel_params = None
+
+    def set_up_boot(self):
+        path = self.download_boot()
+        self.vm.add_args('-drive', 'file=%s,if=none,id=drv0' % path)
+        self.vm.add_args('-device', 'xen-disk,drive=drv0,vdev=xvda')
+
+    def setUp(self):
+        super(KVMXenGuest, self).setUp(None, 'virtio-net-pci')
+
+    def common_vm_setup(self, custom_kernel=None):
+        self.require_accelerator("kvm")
+        self.vm.add_args("-accel", "kvm,xen-version=0x4000a,kernel-irqchip=split")
+        self.vm.add_args("-smp", "4")
+
+        if custom_kernel is None:
+            return
+
+        kernel_url = self.distro.pxeboot_url + 'vmlinuz'
+        initrd_url = self.distro.pxeboot_url + 'initrd.img'
+        self.kernel_path = self.fetch_asset(kernel_url, algorithm='sha256',
+                                            asset_hash=self.distro.kernel_hash)
+        self.initrd_path = self.fetch_asset(initrd_url, algorithm='sha256',
+                                            asset_hash=self.distro.initrd_hash)
+
+    def run_and_check(self):
+        if self.kernel_path:
+            self.vm.add_args('-kernel', self.kernel_path,
+                             '-append', self.kernel_params,
+                             '-initrd', self.initrd_path)
+        self.launch_and_wait()
+        self.ssh_command('cat /proc/cmdline')
+        self.ssh_command('dmesg | grep -e "Grant table initialized"')
+
+    def test_kvm_xen_guest(self):
+        """
+        :avocado: tags=kvm_xen_guest
+        """
+
+        self.common_vm_setup(True)
+
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks')
+        self.run_and_check()
+        self.ssh_command('grep xen-pirq.*msi /proc/interrupts')
+
+    def test_kvm_xen_guest_nomsi(self):
+        """
+        :avocado: tags=kvm_xen_guest_nomsi
+        """
+
+        self.common_vm_setup(True)
+
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks pci=nomsi')
+        self.run_and_check()
+        self.ssh_command('grep xen-pirq.* /proc/interrupts')
+
+    def test_kvm_xen_guest_noapic_nomsi(self):
+        """
+        :avocado: tags=kvm_xen_guest_noapic_nomsi
+        """
+
+        self.common_vm_setup(True)
+
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks noapic pci=nomsi')
+        self.run_and_check()
+        self.ssh_command('grep xen-pirq /proc/interrupts')
+
+    def test_kvm_xen_guest_vapic(self):
+        """
+        :avocado: tags=kvm_xen_guest_vapic
+        """
+
+        self.common_vm_setup(True)
+        self.vm.add_args('-cpu', 'host,+xen-vapic')
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks')
+        self.run_and_check()
+        self.ssh_command('grep xen-pirq /proc/interrupts')
+        self.ssh_command('grep PCI-MSI /proc/interrupts')
+
+    def test_kvm_xen_guest_novector(self):
+        """
+        :avocado: tags=kvm_xen_guest_novector
+        """
+
+        self.common_vm_setup(True)
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks' +
+                              ' xen_no_vector_callback')
+        self.run_and_check()
+        self.ssh_command('grep xen-platform-pci /proc/interrupts')
+
+    def test_kvm_xen_guest_novector_nomsi(self):
+        """
+        :avocado: tags=kvm_xen_guest_novector_nomsi
+        """
+
+        self.common_vm_setup(True)
+
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks pci=nomsi' +
+                              ' xen_no_vector_callback')
+        self.run_and_check()
+        self.ssh_command('grep xen-platform-pci /proc/interrupts')
+
+    def test_kvm_xen_guest_novector_noapic(self):
+        """
+        :avocado: tags=kvm_xen_guest_novector_noapic
+        """
+
+        self.common_vm_setup(True)
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' xen_emul_unplug=ide-disks' +
+                              ' xen_no_vector_callback noapic')
+        self.run_and_check()
+        self.ssh_command('grep xen-platform-pci /proc/interrupts')