avocado_qemu: Add Intel iommu tests

Add Intel IOMMU functional tests based on fedora 31.
Different configs are checked:
- strict
- caching mode, strict
- passthrough.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Willian Rampazzo <willianr@redhat.com>
Tested-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210706131729.30749-5-eric.auger@redhat.com>
[CR: split long lines]
Signed-off-by: Cleber Rosa <crosa@redhat.com>

tests/acceptance/intel_iommu.py

@@ -0,0 +1,119 @@
+# INTEL_IOMMU Functional tests
+#
+# Copyright (c) 2021 Red Hat, Inc.
+#
+# Author:
+#  Eric Auger <eric.auger@redhat.com>
+#
+# 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 import skipIf
+from avocado_qemu import LinuxTest
+
+@skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
+class IntelIOMMU(LinuxTest):
+    """
+    :avocado: tags=arch:x86_64
+    :avocado: tags=distro:fedora
+    :avocado: tags=distro_version:31
+    :avocado: tags=machine:q35
+    :avocado: tags=accel:kvm
+    :avocado: tags=intel_iommu
+    """
+
+    IOMMU_ADDON = ',iommu_platform=on,disable-modern=off,disable-legacy=on'
+    kernel_path = None
+    initrd_path = None
+    kernel_params = None
+
+    def set_up_boot(self):
+        path = self.download_boot()
+        self.vm.add_args('-device', 'virtio-blk-pci,bus=pcie.0,scsi=off,' +
+                         'drive=drv0,id=virtio-disk0,bootindex=1,'
+                         'werror=stop,rerror=stop' + self.IOMMU_ADDON)
+        self.vm.add_args('-device', 'virtio-gpu-pci' + self.IOMMU_ADDON)
+        self.vm.add_args('-drive',
+                         'file=%s,if=none,cache=writethrough,id=drv0' % path)
+
+    def setUp(self):
+        super(IntelIOMMU, self).setUp(None, 'virtio-net-pci' + self.IOMMU_ADDON)
+
+    def add_common_args(self):
+        self.vm.add_args('-device', 'virtio-rng-pci,rng=rng0')
+        self.vm.add_args('-object',
+                         'rng-random,id=rng0,filename=/dev/urandom')
+
+    def common_vm_setup(self, custom_kernel=None):
+        self.require_accelerator("kvm")
+        self.add_common_args()
+        self.vm.add_args("-accel", "kvm")
+
+        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)
+        self.initrd_path = self.fetch_asset(initrd_url)
+
+    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 DMAR -e IOMMU')
+        self.ssh_command('find /sys/kernel/iommu_groups/ -type l')
+        self.ssh_command('dnf -y install numactl-devel')
+
+    def test_intel_iommu(self):
+        """
+        :avocado: tags=intel_iommu_intremap
+        """
+
+        self.common_vm_setup(True)
+        self.vm.add_args('-device', 'intel-iommu,intremap=on')
+        self.vm.add_args('-machine', 'kernel_irqchip=split')
+
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' quiet intel_iommu=on')
+        self.run_and_check()
+
+    def test_intel_iommu_strict(self):
+        """
+        :avocado: tags=intel_iommu_strict
+        """
+
+        self.common_vm_setup(True)
+        self.vm.add_args('-device', 'intel-iommu,intremap=on')
+        self.vm.add_args('-machine', 'kernel_irqchip=split')
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' quiet intel_iommu=on,strict')
+        self.run_and_check()
+
+    def test_intel_iommu_strict_cm(self):
+        """
+        :avocado: tags=intel_iommu_strict_cm
+        """
+
+        self.common_vm_setup(True)
+        self.vm.add_args('-device', 'intel-iommu,intremap=on,caching-mode=on')
+        self.vm.add_args('-machine', 'kernel_irqchip=split')
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' quiet intel_iommu=on,strict')
+        self.run_and_check()
+
+    def test_intel_iommu_pt(self):
+        """
+        :avocado: tags=intel_iommu_pt
+        """
+
+        self.common_vm_setup(True)
+        self.vm.add_args('-device', 'intel-iommu,intremap=on')
+        self.vm.add_args('-machine', 'kernel_irqchip=split')
+        self.kernel_params = (self.distro.default_kernel_params +
+                              ' quiet intel_iommu=on iommu=pt')
+        self.run_and_check()