libxl: Support specifying a custom firmware path

libxl added support for specifying custom firmware paths long ago. The
functionality exists in all Xen version supported by libvirt. This patch
adds support for user-specified efi firmware paths in the libxl driver.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/libxl/libxl_conf.c

@@ -632,14 +632,10 @@ libxlMakeDomBuildInfo(virDomainDef *def,
         b_info->ramdisk = g_strdup(def->os.initrd);
 
         /*
-         * Currently libxl only allows specifying the type of BIOS.
-         * If automatic firmware selection is enabled or the loader
-         * type is PFLASH, we assume OVMF and set libxl_bios_type
-         * to LIBXL_BIOS_TYPE_OVMF. The path to the OVMF firmware is
-         * configured when building Xen using '--with-system-ovmf='. If
-         * not specified, LIBXL_FIRMWARE_DIR/ovmf.bin is used. In the
-         * future, Xen will support a user-specified firmware path. See
-         * https://lists.xenproject.org/archives/html/xen-devel/2016-03/msg01628.html
+         * libxl allows specifying the type of firmware and an optional path.
+         * If the path is not explicitly specified, a default path for the given
+         * firmware type is used. For EFI, it's LIBXL_FIRMWARE_DIR/ovmf.bin.
+         * Currently libxl does not support specifying nvram for EFI firmwares.
          */
         if (def->os.firmware == VIR_DOMAIN_OS_DEF_FIRMWARE_EFI) {
             if (def->os.loader == NULL)
@@ -651,9 +647,11 @@ libxlMakeDomBuildInfo(virDomainDef *def,
             if (def->os.loader->readonly == VIR_TRISTATE_BOOL_ABSENT)
                 def->os.loader->readonly = VIR_TRISTATE_BOOL_YES;
             b_info->u.hvm.bios = LIBXL_BIOS_TYPE_OVMF;
+            b_info->u.hvm.system_firmware = g_strdup(def->os.loader->path);
             def->os.firmware = VIR_DOMAIN_OS_DEF_FIRMWARE_NONE;
         } else if (virDomainDefHasOldStyleUEFI(def)) {
             b_info->u.hvm.bios = LIBXL_BIOS_TYPE_OVMF;
+            b_info->u.hvm.system_firmware = g_strdup(def->os.loader->path);
         }
 
         if (def->os.loader && def->os.loader->format != VIR_STORAGE_FILE_RAW) {

tests/libxlxml2domconfigdata/efi-hvm.json

@@ -0,0 +1,91 @@
+{
+    "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": {
+            "bios": "ovmf",
+            "pae": "True",
+            "system_firmware": "/usr/share/qemu/ovmf-x86_64-xen.bin",
+            "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"
+}

tests/libxlxml2domconfigdata/efi-hvm.xml

@@ -0,0 +1,36 @@
+<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 readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x86_64-xen.bin</loader>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <apic/>
+    <acpi/>
+    <pae/>
+  </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>

tests/libxlxml2domconfigtest.c

@@ -183,6 +183,7 @@ mymain(void)
 
     DO_TEST("basic-pv");
     DO_TEST("basic-hvm");
+    DO_TEST("efi-hvm");
 # ifdef WITH_XEN_PVH
     DO_TEST("basic-pvh");
 # endif