On 3/25/25 00:24, Will wrote:
Adds support for configuring <hyperv/> flags for domains
running under Xen.

The following flags, making use of QEMU's existing flags, are now
configurable for Xen: vapic, synic, stimer, frequencies, tlbflush and
ipi

Tests have been added validating translation to libxl's viridian flags

Updated docs section on <hyperv/> flags to note support and to specify
which flags work with Xen

Signed-off-by: Will <tcosproje...@gmail.com>
---
  docs/formatdomain.rst                         |  24 +--
  src/libxl/libxl_conf.c                        | 101 ++++++++++++
  .../viridian-hvm-full.json                    | 101 ++++++++++++
  .../viridian-hvm-full.xml                     |  45 +++++
  .../libxlxml2domconfigdata/viridian-hvm.json  |  99 +++++++++++
  tests/libxlxml2domconfigdata/viridian-hvm.xml |  42 +++++
  .../viridian-passthrough.json                 | 155 ++++++++++++++++++
  .../viridian-passthrough.xml                  |  37 +++++
  tests/libxlxml2domconfigtest.c                |   8 +
  9 files changed, 601 insertions(+), 11 deletions(-)
  create mode 100644 tests/libxlxml2domconfigdata/viridian-hvm-full.json
  create mode 100644 tests/libxlxml2domconfigdata/viridian-hvm-full.xml
  create mode 100644 tests/libxlxml2domconfigdata/viridian-hvm.json
  create mode 100644 tests/libxlxml2domconfigdata/viridian-hvm.xml
  create mode 100644 tests/libxlxml2domconfigdata/viridian-passthrough.json
  create mode 100644 tests/libxlxml2domconfigdata/viridian-passthrough.xml

diff --git a/docs/formatdomain.rst b/docs/formatdomain.rst
index aae58fab60..7220c9ff4b 100644
--- a/docs/formatdomain.rst
+++ b/docs/formatdomain.rst
@@ -2132,32 +2132,34 @@ are:
     based virtualization drivers, such as LXC.
  ``hyperv``
     Enable various features improving behavior of guests running Microsoft
-   Windows.
+   Windows. :since:`Since 11.2.0` some of these flags are also available for
+   Xen domains running Microsoft Windows.

This and below should now be 11.3.0.

=============== ====================================================================== ============================================ ========================================================================
     Feature         Description                                                
            Value                                        Since
     =============== 
====================================================================== 
============================================ 
========================================================================
-   relaxed         Relax constraints on timers                                 
           on, off                                      :since:`1.0.0 (QEMU 
2.0)`
-   vapic           Enable virtual APIC                                         
           on, off                                      :since:`1.1.0 (QEMU 
2.0)`
+   relaxed         Relax constraints on timers                                 
           on, off                                      :since:`1.0.0 (QEMU 
2.0), 11.2.0 (Xen, always on)`
+   vapic           Enable virtual APIC                                         
           on, off                                      :since:`1.1.0 (QEMU 
2.0), 11.2.0 (Xen)`
     spinlocks       Enable spinlock support                                    
            on, off; retries - at least 4095             :since:`1.1.0 (QEMU 
2.0)`
-   vpindex         Virtual processor index                                     
           on, off                                      :since:`1.3.3 (QEMU 
2.5)`
+   vpindex         Virtual processor index                                     
           on, off                                      :since:`1.3.3 (QEMU 
2.5), 11.2.0 (Xen, always on)`
     runtime         Processor time spent on running guest code and on behalf 
of guest code on, off                                      :since:`1.3.3 (QEMU 
2.5)`
-   synic           Enable Synthetic Interrupt Controller (SynIC)               
           on, off                                      :since:`1.3.3 (QEMU 
2.6)`
-   stimer          Enable SynIC timers, optionally with Direct Mode support    
           on, off; direct - on,off                     :since:`1.3.3 (QEMU 
2.6), direct mode 5.7.0 (QEMU 4.1)`
+   synic           Enable Synthetic Interrupt Controller (SynIC)               
           on, off                                      :since:`1.3.3 (QEMU 
2.6), 11.2.0 (Xen)`
+   stimer          Enable SynIC timers, optionally with Direct Mode support    
           on, off; direct - on,off                     :since:`1.3.3 (QEMU 
2.6), direct mode 5.7.0 (QEMU 4.1), 11.2.0 (Xen, on/off only)`
     reset           Enable hypervisor reset                                    
            on, off                                      :since:`1.3.3 (QEMU 
2.5)`
     vendor_id       Set hypervisor vendor id                                   
            on, off; value - string, up to 12 characters :since:`1.3.3 (QEMU 
2.5)`
-   frequencies     Expose frequency MSRs                                       
           on, off                                      :since:`4.7.0 (QEMU 
2.12)`
+   frequencies     Expose frequency MSRs                                       
           on, off                                      :since:`4.7.0 (QEMU 
2.12), 11.2.0 (Xen)`
     reenlightenment Enable re-enlightenment notification on migration          
            on, off                                      :since:`4.7.0 (QEMU 
3.0)`
-   tlbflush        Enable PV TLB flush support                                 
           on, off; direct - on,off; extended - on,off  :since:`4.7.0 (QEMU 
3.0), direct and extended modes 11.0.0 (QEMU 7.1.0)`
-   ipi             Enable PV IPI support                                       
           on, off                                      :since:`4.10.0 (QEMU 
3.1)`
+   tlbflush        Enable PV TLB flush support                                 
           on, off; direct - on,off; extended - on,off  :since:`4.7.0 (QEMU 
3.0), direct and extended modes 11.0.0 (QEMU 7.1.0), 11.2.0 (Xen, on/off only)`
+   ipi             Enable PV IPI support                                       
           on, off                                      :since:`4.10.0 (QEMU 
3.1), 11.2.0 (Xen)`
     evmcs           Enable Enlightened VMCS                                    
            on, off                                      :since:`4.10.0 (QEMU 
3.1)`
     avic            Enable use Hyper-V SynIC with hardware APICv/AVIC          
            on, off                                      :since:`8.10.0 (QEMU 
6.2)`
     emsr_bitmap     Avoid unnecessary updates to L2 MSR Bitmap upon vmexits.   
            on, off                                      :since:`10.7.0 (QEMU 
7.1)`
     xmm_input       Enable XMM Fast Hypercall Input                            
            on, off                                      :since:`10.7.0 (QEMU 
7.1)`
     =============== 
====================================================================== 
============================================ 
========================================================================
- :since:`Since 8.0.0`, the hypervisor can be configured further by setting
-   the ``mode`` attribute to one of the following values:
+   :since:`Since 8.0.0 (QEMU) Since 11.2.0 (Xen)`, the hypervisor can be
+   configured further by setting the ``mode`` attribute to one of the following
+   values:
``custom``
        Set exactly the specified features.
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 16cd11c215..bdd30dd65a 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -582,6 +582,107 @@ libxlMakeDomBuildInfo(virDomainDef *def,
                            VIR_TRISTATE_SWITCH_ON);
  #endif
+#ifdef LIBXL_HAVE_BUILDINFO_HVM_VIRIDIAN_ENABLE_DISABLE
+        if (def->features[VIR_DOMAIN_FEATURE_HYPERV] != 
VIR_DOMAIN_HYPERV_MODE_NONE) {
+            libxl_bitmap_alloc(ctx, &b_info->u.hvm.viridian_enable,
+                               
LIBXL_BUILDINFO_HVM_VIRIDIAN_ENABLE_DISABLE_WIDTH);
+
+            switch ((virDomainHyperVMode) 
def->features[VIR_DOMAIN_FEATURE_HYPERV]) {
+            case VIR_DOMAIN_HYPERV_MODE_CUSTOM:
+                /* Base is required by Xen to enable any other flag */
+                libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                 LIBXL_VIRIDIAN_ENLIGHTENMENT_BASE);
+                /* Enable crash ctl register by default to allow guest logs to 
reach Xen */
+                libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                 LIBXL_VIRIDIAN_ENLIGHTENMENT_CRASH_CTL);
+                break;
+            case VIR_DOMAIN_HYPERV_MODE_PASSTHROUGH:
+                libxl_bitmap_set_any(&b_info->u.hvm.viridian_enable);
+                break;
+            case VIR_DOMAIN_HYPERV_MODE_NONE:
+            case VIR_DOMAIN_HYPERV_MODE_LAST:
+            default:
+                virReportEnumRangeError(virDomainHyperVMode,
+                                        
def->features[VIR_DOMAIN_FEATURE_HYPERV]);
+                return -1;
+            }
+
+            for (i = 0; i < VIR_DOMAIN_HYPERV_LAST; i++) {
+                switch ((virDomainHyperv) i) {
+                case VIR_DOMAIN_HYPERV_VPINDEX:
+                case VIR_DOMAIN_HYPERV_RELAXED:
+                    /* Already set by base flag */
+                    break;
+                case VIR_DOMAIN_HYPERV_SYNIC:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         LIBXL_VIRIDIAN_ENLIGHTENMENT_SYNIC);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_STIMER:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        /* STIMER implies synic and clock features */
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         LIBXL_VIRIDIAN_ENLIGHTENMENT_STIMER);
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         LIBXL_VIRIDIAN_ENLIGHTENMENT_SYNIC);
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         
LIBXL_VIRIDIAN_ENLIGHTENMENT_TIME_REF_COUNT);
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         
LIBXL_VIRIDIAN_ENLIGHTENMENT_REFERENCE_TSC);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_VAPIC:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         
LIBXL_VIRIDIAN_ENLIGHTENMENT_APIC_ASSIST);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_FREQUENCIES:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         LIBXL_VIRIDIAN_ENLIGHTENMENT_FREQ);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_TLBFLUSH:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         
LIBXL_VIRIDIAN_ENLIGHTENMENT_HCALL_REMOTE_TLB_FLUSH);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_IPI:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        libxl_bitmap_set(&b_info->u.hvm.viridian_enable,
+                                         
LIBXL_VIRIDIAN_ENLIGHTENMENT_HCALL_IPI);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_SPINLOCKS:
+                case VIR_DOMAIN_HYPERV_VENDOR_ID:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        const char *name = virDomainHypervTypeToString(i);
+                        VIR_WARN("Hyper-v flag '%s' specified per-domain but is a 
global Xen setting and will be ignored.", name);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_RUNTIME:
+                case VIR_DOMAIN_HYPERV_RESET:
+                case VIR_DOMAIN_HYPERV_REENLIGHTENMENT:
+                case VIR_DOMAIN_HYPERV_EVMCS:
+                case VIR_DOMAIN_HYPERV_AVIC:
+                case VIR_DOMAIN_HYPERV_EMSR_BITMAP:
+                case VIR_DOMAIN_HYPERV_XMM_INPUT:
+                    if (def->hyperv_features[i] == VIR_TRISTATE_SWITCH_ON) {
+                        const char *name = virDomainHypervTypeToString(i);
+                        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                            _("Hyper-v enlightenment feature '%1$s' is not 
supported for Xen domains."), name);
+                    }
+                    break;
+                case VIR_DOMAIN_HYPERV_LAST:
+                    break;
+                }
+            }
+        }
+#endif
+
          /* copy the table path to acpi_firmware */
          if (def->os.nacpiTables)
              b_info->u.hvm.acpi_firmware = 
g_strdup(def->os.acpiTables[0]->path);
diff --git a/tests/libxlxml2domconfigdata/viridian-hvm-full.json 
b/tests/libxlxml2domconfigdata/viridian-hvm-full.json
new file mode 100644
index 0000000000..5cb69f7b5d
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-hvm-full.json
@@ -0,0 +1,101 @@
+{
+    "c_info": {
+        "type": "hvm",
+        "name": "test-hvm",
+        "uuid": "2147d599-9cc6-c0dc-92ab-4064b5446e9b"
+    },
+    "b_info": {
+        "max_vcpus": 4,
+        "avail_vcpus": [
+            0,
+            1,
+            2,
+            3
+        ],
+        "max_memkb": 1048576,
+        "target_memkb": 1048576,
+        "video_memkb": 8192,
+        "shadow_memkb": 1234,
+        "device_model_version": "qemu_xen",
+        "device_model": "/bin/true",
+        "sched_params": {
+
+        },
+        "apic": "True",
+        "acpi": "True",
+        "type.hvm": {
+            "pae": "True",
+            "viridian_enable": [
+                0,
+                1,
+                2,
+                3,
+                4,
+                5,
+                6,
+                7,
+                8,
+                9
+            ],
+            "vga": {
+                "kind": "cirrus"
+            },
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            },
+            "spice": {
+
+            },
+            "boot": "c",
+            "rdm": {
+
+            }
+        },
+        "arch_arm": {
+
+        }
+    },
+    "disks": [
+        {
+            "pdev_path": "/var/lib/xen/images/test-hvm.img",
+            "vdev": "hda",
+            "backend": "qdisk",
+            "format": "raw",
+            "removable": 1,
+            "readwrite": 1
+        }
+    ],
+    "nics": [
+        {
+            "devid": 0,
+            "mac": "00:16:3e:66:12:b4",
+            "bridge": "br0",
+            "script": "/etc/xen/scripts/vif-bridge",
+            "nictype": "vif_ioemu"
+        }
+    ],
+    "vfbs": [
+        {
+           "devid": -1,
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            }
+        }
+    ],
+    "vkbs": [
+        {
+            "devid": -1
+        }
+    ],
+    "on_reboot": "restart"
+}
diff --git a/tests/libxlxml2domconfigdata/viridian-hvm-full.xml 
b/tests/libxlxml2domconfigdata/viridian-hvm-full.xml
new file mode 100644
index 0000000000..17f5ed5209
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-hvm-full.xml
@@ -0,0 +1,45 @@
+<domain type='xen'>
+  <name>test-hvm</name>
+  <description>None</description>
+  <uuid>2147d599-9cc6-c0dc-92ab-4064b5446e9b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu>4</vcpu>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <clock offset='utc'/>
+  <os>
+    <type>hvm</type>
+    <loader>/usr/lib/xen/boot/hvmloader</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+    <hyperv>
+      <vapic state='on'/>
+      <vpindex state='on'/>
+      <synic state='on'/>
+      <stimer state='on'/>
+      <frequencies state='on'/>
+      <tlbflush state='on'/>
+      <ipi state='on'/>
+    </hyperv>
+  </features>
+  <devices>
+    <emulator>/bin/true</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu'/>
+      <source file='/var/lib/xen/images/test-hvm.img'/>
+      <target dev='hda'/>
+    </disk>
+    <interface type='bridge'>
+      <source bridge='br0'/>
+      <mac address='00:16:3e:66:12:b4'/>
+      <script path='/etc/xen/scripts/vif-bridge'/>
+    </interface>
+    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'/>
+  </devices>
+</domain>
diff --git a/tests/libxlxml2domconfigdata/viridian-hvm.json 
b/tests/libxlxml2domconfigdata/viridian-hvm.json
new file mode 100644
index 0000000000..4f9a52ed89
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-hvm.json
@@ -0,0 +1,99 @@
+{
+    "c_info": {
+        "type": "hvm",
+        "name": "test-hvm",
+        "uuid": "2147d599-9cc6-c0dc-92ab-4064b5446e9b"
+    },
+    "b_info": {
+        "max_vcpus": 4,
+        "avail_vcpus": [
+            0,
+            1,
+            2,
+            3
+        ],
+        "max_memkb": 1048576,
+        "target_memkb": 1048576,
+        "video_memkb": 8192,
+        "shadow_memkb": 1234,
+        "device_model_version": "qemu_xen",
+        "device_model": "/bin/true",
+        "sched_params": {
+
+        },
+        "apic": "True",
+        "acpi": "True",
+        "type.hvm": {
+            "pae": "True",
+            "viridian_enable": [
+                0,
+                2,
+                3,
+                4,
+                6,
+                7,
+                8,
+                9
+            ],
+            "vga": {
+                "kind": "cirrus"
+            },
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            },
+            "spice": {
+
+            },
+            "boot": "c",
+            "rdm": {
+
+            }
+        },
+        "arch_arm": {
+
+        }
+    },
+    "disks": [
+        {
+            "pdev_path": "/var/lib/xen/images/test-hvm.img",
+            "vdev": "hda",
+            "backend": "qdisk",
+            "format": "raw",
+            "removable": 1,
+            "readwrite": 1
+        }
+    ],
+    "nics": [
+        {
+            "devid": 0,
+            "mac": "00:16:3e:66:12:b4",
+            "bridge": "br0",
+            "script": "/etc/xen/scripts/vif-bridge",
+            "nictype": "vif_ioemu"
+        }
+    ],
+    "vfbs": [
+        {
+           "devid": -1,
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            }
+        }
+    ],
+    "vkbs": [
+        {
+            "devid": -1
+        }
+    ],
+    "on_reboot": "restart"
+}
diff --git a/tests/libxlxml2domconfigdata/viridian-hvm.xml 
b/tests/libxlxml2domconfigdata/viridian-hvm.xml
new file mode 100644
index 0000000000..c6139885aa
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-hvm.xml
@@ -0,0 +1,42 @@
+<domain type='xen'>
+  <name>test-hvm</name>
+  <description>None</description>
+  <uuid>2147d599-9cc6-c0dc-92ab-4064b5446e9b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu>4</vcpu>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <clock offset='utc'/>
+  <os>
+    <type>hvm</type>
+    <loader>/usr/lib/xen/boot/hvmloader</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+    <hyperv mode="custom">
+      <synic state='on'/>
+      <stimer state='on'/>
+      <tlbflush state='on'/>
+      <ipi state='on'/>
+    </hyperv>
+  </features>
+  <devices>
+    <emulator>/bin/true</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu'/>
+      <source file='/var/lib/xen/images/test-hvm.img'/>
+      <target dev='hda'/>
+    </disk>
+    <interface type='bridge'>
+      <source bridge='br0'/>
+      <mac address='00:16:3e:66:12:b4'/>
+      <script path='/etc/xen/scripts/vif-bridge'/>
+    </interface>
+    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'/>
+  </devices>
+</domain>
diff --git a/tests/libxlxml2domconfigdata/viridian-passthrough.json 
b/tests/libxlxml2domconfigdata/viridian-passthrough.json
new file mode 100644
index 0000000000..66069931f6
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-passthrough.json
@@ -0,0 +1,155 @@
+{
+    "c_info": {
+        "type": "hvm",
+        "name": "test-hvm",
+        "uuid": "2147d599-9cc6-c0dc-92ab-4064b5446e9b"
+    },
+    "b_info": {
+        "max_vcpus": 4,
+        "avail_vcpus": [
+            0,
+            1,
+            2,
+            3
+        ],
+        "max_memkb": 1048576,
+        "target_memkb": 1048576,
+        "video_memkb": 8192,
+        "shadow_memkb": 1234,
+        "device_model_version": "qemu_xen",
+        "device_model": "/bin/true",
+        "sched_params": {
+
+        },
+        "apic": "True",
+        "acpi": "True",
+        "type.hvm": {
+            "pae": "True",
+            "viridian_enable": [
+                0,
+                1,
+                2,
+                3,
+                4,
+                5,
+                6,
+                7,
+                8,
+                9,
+                10,
+                11,
+                12,
+                13,
+                14,
+                15,
+                16,
+                17,
+                18,
+                19,
+                20,
+                21,
+                22,
+                23,
+                24,
+                25,
+                26,
+                27,
+                28,
+                29,
+                30,
+                31,
+                32,
+                33,
+                34,
+                35,
+                36,
+                37,
+                38,
+                39,
+                40,
+                41,
+                42,
+                43,
+                44,
+                45,
+                46,
+                47,
+                48,
+                49,
+                50,
+                51,
+                52,
+                53,
+                54,
+                55,
+                56,
+                57,
+                58,
+                59,
+                60,
+                61,
+                62,
+                63
+            ],
+            "vga": {
+                "kind": "cirrus"
+            },
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            },
+            "spice": {
+
+            },
+            "boot": "c",
+            "rdm": {
+
+            }
+        },
+        "arch_arm": {
+
+        }
+    },
+    "disks": [
+        {
+            "pdev_path": "/var/lib/xen/images/test-hvm.img",
+            "vdev": "hda",
+            "backend": "qdisk",
+            "format": "raw",
+            "removable": 1,
+            "readwrite": 1
+        }
+    ],
+    "nics": [
+        {
+            "devid": 0,
+            "mac": "00:16:3e:66:12:b4",
+            "bridge": "br0",
+            "script": "/etc/xen/scripts/vif-bridge",
+            "nictype": "vif_ioemu"
+        }
+    ],
+    "vfbs": [
+        {
+           "devid": -1,
+            "vnc": {
+                "enable": "True",
+                "listen": "0.0.0.0",
+                "findunused": "False"
+            },
+            "sdl": {
+                "enable": "False"
+            }
+        }
+    ],
+    "vkbs": [
+        {
+            "devid": -1
+        }
+    ],
+    "on_reboot": "restart"
+}
diff --git a/tests/libxlxml2domconfigdata/viridian-passthrough.xml 
b/tests/libxlxml2domconfigdata/viridian-passthrough.xml
new file mode 100644
index 0000000000..6d6b7d22cd
--- /dev/null
+++ b/tests/libxlxml2domconfigdata/viridian-passthrough.xml
@@ -0,0 +1,37 @@
+<domain type='xen'>
+  <name>test-hvm</name>
+  <description>None</description>
+  <uuid>2147d599-9cc6-c0dc-92ab-4064b5446e9b</uuid>
+  <memory>1048576</memory>
+  <currentMemory>1048576</currentMemory>
+  <vcpu>4</vcpu>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <clock offset='utc'/>
+  <os>
+    <type>hvm</type>
+    <loader>/usr/lib/xen/boot/hvmloader</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+    <hyperv mode="passthrough"/>
+  </features>
+  <devices>
+    <emulator>/bin/true</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu'/>
+      <source file='/var/lib/xen/images/test-hvm.img'/>
+      <target dev='hda'/>
+    </disk>
+    <interface type='bridge'>
+      <source bridge='br0'/>
+      <mac address='00:16:3e:66:12:b4'/>
+      <script path='/etc/xen/scripts/vif-bridge'/>
+    </interface>
+    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'/>
+  </devices>
+</domain>
diff --git a/tests/libxlxml2domconfigtest.c b/tests/libxlxml2domconfigtest.c
index 255855b156..bf9233991f 100644
--- a/tests/libxlxml2domconfigtest.c
+++ b/tests/libxlxml2domconfigtest.c
@@ -211,6 +211,14 @@ mymain(void)
      DO_TEST("single-serial");
      DO_TEST("multiple-serial");
+#ifdef LIBXL_HAVE_BUILDINFO_HVM_VIRIDIAN_ENABLE_DISABLE
+    DO_TEST("viridian-hvm");
+    DO_TEST("viridian-hvm-full");
+#if LIBXL_BUILDINFO_HVM_VIRIDIAN_ENABLE_DISABLE_WIDTH == 64
+    DO_TEST("viridian-passthrough");
+#endif
+#endif

With cppi installed, the preprocessor_indentation test fails here when running 'ninja test'.

Regards,
Jim

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