add deploy tweak tweak to set cache and io

attributes for CDROMs

Signed-off-by: Anton Todorov <[email protected]>

misc/qemu.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+#
+# -------------------------------------------------------------------------- #
+# Copyright 2015-2019, StorPool (storpool.com)                               #
+#                                                                            #
+# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
+# not use this file except in compliance with the License. You may obtain    #
+# a copy of the License at                                                   #
+#                                                                            #
+# http://www.apache.org/licenses/LICENSE-2.0                                 #
+#                                                                            #
+# Unless required by applicable law or agreed to in writing, software        #
+# distributed under the License is distributed on an "AS IS" BASIS,          #
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
+# See the License for the specific language governing permissions and        #
+# limitations under the License.                                             #
+#--------------------------------------------------------------------------- #
+#
+from __future__ import print_function
+
+import sys
+import os
+from xml.etree.ElementTree import ElementTree
+from xml.etree import ElementTree as ET
+
+ns = {'qemu': 'http://libvirt.org/schemas/domain/qemu/1.0',
+       'one': "http://opennebula.org/xmlns/libvirt/1.0"
+     }
+
+if len(sys.argv) <= 2 or sys.argv[2] != "migrate":
+    sys.exit(0)
+
+for prefix, uri in ns.items():
+    ET.register_namespace(prefix, uri)
+
+tree = ET.parse(sys.stdin)
+root = tree.getroot()
+
+for disk in root.findall('.//disk'):
+    try:
+        source = disk.find('./source')
+        if 'file' in source.attrib:
+            diskPath = os.path.realpath(source.attrib['file'])
+        elif 'dev' in source.attrib:
+            diskPath = os.path.realpath(source.attrib['dev'])
+        else:
+            diskPath = None
+        if diskPath and diskPath[0:8] == '/dev/sp-':
+            driver = disk.find('./driver')
+            driver.attrib['cache'] = 'none'
+            driver.attrib['io'] = 'native'
+    except Exception as e:
+        print("Error: {e}".format(e=e), file=stderr)
+
+tree.write(sys.stdout)
+
+sys.stdout.flush()

vmm/kvm/deploy-tweaks.d.example/context-cache.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+# -------------------------------------------------------------------------- #
+# Copyright 2015-2019, StorPool (storpool.com)                               #
+#                                                                            #
+# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
+# not use this file except in compliance with the License. You may obtain    #
+# a copy of the License at                                                   #
+#                                                                            #
+# http://www.apache.org/licenses/LICENSE-2.0                                 #
+#                                                                            #
+# Unless required by applicable law or agreed to in writing, software        #
+# distributed under the License is distributed on an "AS IS" BASIS,          #
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
+# See the License for the specific language governing permissions and        #
+# limitations under the License.                                             #
+#--------------------------------------------------------------------------- #
+
+from __future__ import print_function
+from sys import argv, stderr
+from xml.etree import ElementTree as ET
+
+ns = {'qemu': 'http://libvirt.org/schemas/domain/qemu/1.0',
+       'one': "http://opennebula.org/xmlns/libvirt/1.0"
+     }
+
+def indent(elem, level=0):
+    i = "\n" + level*"\t"
+    if elem is not None:
+#        if not elem.text or not elem.text.strip():
+#            elem.text = i + "\t"
+        if not elem.tail or not elem.tail.strip():
+            elem.tail = i
+        for elem in elem:
+            indent(elem, level+1)
+        if not elem.tail or not elem.tail.strip():
+            elem.tail = i
+    else:
+        if level and (not elem.tail or not elem.tail.strip()):
+            elem.tail = i
+
+xmlDomain = argv[1]
+doc = ET.parse(xmlDomain)
+root = doc.getroot()
+
+for prefix, uri in ns.items():
+    ET.register_namespace(prefix, uri)
+
+changed = 0
+for disk in root.findall('./devices/disk[@type="file"][@device="cdrom"]'):
+    try:
+        driver = disk.find('./driver')
+        driver.attrib['cache'] = 'none'
+        driver.attrib['io'] = 'native'
+        changed = 1
+    except Exception as e:
+        print("Error: {e}".format(e=e), file=stderr)
+
+if changed:
+    indent(root)
+    doc.write(xmlDomain)