[Kimchi-devel] [PATCH 1/2] Check memory alignment in PowerPC to 256MiB

[Rodrigo Trujillo]

QEMU for Power requires memory aligned to 256MiB.
This patch makes the checking and changes if necessary.

Signed-off-by: Rodrigo Trujillo <rodrigo.trujillo at linux.vnet.ibm.com>
---
 src/wok/plugins/kimchi/i18n.py      |  1 +
 src/wok/plugins/kimchi/model/vms.py | 25 +++++++++++++++++++++++++
 src/wok/plugins/kimchi/osinfo.py    |  4 ++++
 3 files changed, 30 insertions(+)

diff --git a/src/wok/plugins/kimchi/i18n.py b/src/wok/plugins/kimchi/i18n.py
index 42a5e16..9fb4edc 100644
--- a/src/wok/plugins/kimchi/i18n.py
+++ b/src/wok/plugins/kimchi/i18n.py
@@ -115,6 +115,7 @@ messages = {
     "KCHVM0058E": _("Failed to migrate virtual machine %(name)s due error: %(err)s"),
     "KCHVM0059E": _("User name of the remote server must be a string."),
     "KCHVM0060E": _("Destination host of the migration must be a string."),
+    "KCHVM0061E": _("Memory value %(mem)s must be aligned to 256MiB."),
 
     "KCHVMHDEV0001E": _("VM %(vmid)s does not contain directly assigned host device %(dev_name)s."),
     "KCHVMHDEV0002E": _("The host device %(dev_name)s is not allowed to directly assign to VM."),
diff --git a/src/wok/plugins/kimchi/model/vms.py b/src/wok/plugins/kimchi/model/vms.py
index 0641ae8..3965906 100644
--- a/src/wok/plugins/kimchi/model/vms.py
+++ b/src/wok/plugins/kimchi/model/vms.py
@@ -21,6 +21,7 @@ import copy
 import libvirt
 import lxml.etree as ET
 import os
+import platform
 import random
 import socket
 import string
@@ -232,6 +233,13 @@ class VMModel(object):
             vm_locks[name] = lock
 
         with lock:
+            # make sure memory is alingned in 256MiB
+            distro, _, _ = platform.linux_distribution()
+            if 'memory' in params and distro == "IBM_PowerKVM":
+                if params['memory'] % 256 != 0:
+                    raise InvalidParameter('KCHVM0061E',
+                                           {'mem': str(params['memory'])})
+
             dom = self.get_vm(name, self.conn)
             vm_name, dom = self._static_vm_update(name, dom, params)
             self._live_vm_update(dom, params)
@@ -800,6 +808,17 @@ class VMModel(object):
                 raise OperationFailed("KCHVM0041E")
             elif slots == 0:
                 slots = 1
+
+            force_max_mem_update = False
+            distro, _, _ = platform.linux_distribution()
+            if distro == "IBM_PowerKVM":
+                # max memory 256MiB alignment
+                host_mem -= (host_mem % 256)
+                # force max memory update if it exists but it's wrong.
+                if maxMem is not None and\
+                   int(maxMem.text) != (host_mem * 1024):
+                    force_max_mem_update = True
+
             if maxMem is None:
                 max_mem_xml = E.maxMemory(
                     str(host_mem * 1024),
@@ -813,6 +832,12 @@ class VMModel(object):
                                           './maxMemory',
                                           str(slots),
                                           attr='slots')
+
+                if force_max_mem_update:
+                    new_xml = xml_item_update(new_xml,
+                                              './maxMemory',
+                                              str(host_mem * 1024))
+
             return new_xml
         return ET.tostring(root, encoding="utf-8")
 
diff --git a/src/wok/plugins/kimchi/osinfo.py b/src/wok/plugins/kimchi/osinfo.py
index 75a21ff..c915e6d 100644
--- a/src/wok/plugins/kimchi/osinfo.py
+++ b/src/wok/plugins/kimchi/osinfo.py
@@ -204,6 +204,10 @@ def lookup(distro, version):
     # set up arch to ppc64 instead of ppc64le due to libvirt compatibility
     if params["arch"] == "ppc64le":
         params["arch"] = "ppc64"
+        # in Power, memory must be aligned in 256MiB
+        if (params['max_memory'] / 1024) % 256 != 0:
+            alignment = params['max_memory'] % (256 * 1024)
+            params['max_memory'] -= alignment
 
     if distro in modern_version_bases[arch]:
         if LooseVersion(version) >= LooseVersion(
-- 
2.1.0