[PATCH 1/8] hyperv: make Msvm_ComputerSystem WQL queries locale agnostic

mcoleman at datto.com mcoleman at datto.com
Thu Oct 1 21:47:10 UTC 2020

From: Matt Coleman <matt at datto.com>

There are two specific WQL queries we're using to get either a list of
virtual machines or the hypervisor host itself from Msvm_ComputerSystem.
Those queries rely on filtering results based on the "Description"
field. Since the "Description" field is locale sensitive, the queries
will fail if the Windows host is using a language pack. While the WSMAN
spec allows the client to set the requested locale (and it is supported
since openwsman 2.6.x), the Windows WinRM service does not respect this
setting: it returns non-English strings despite the WSMAN request
properly setting the locale to 'en-US'. Therefore, this patch changes
the WQL query to make use of the "__SERVER" field to stop relying on
English strings in queries and side step the issue.

Co-authored-by: Dawid Zamirski <dzamirski at datto.com>
Signed-off-by: Matt Coleman <matt at datto.com>
 NEWS.rst                        | 4 ++++
 src/hyperv/hyperv_wmi_classes.h | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/NEWS.rst b/NEWS.rst
index 7663cf4208..5c9ab4a964 100644
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -17,6 +17,10 @@ v6.9.0 (unreleased)
 * **Bug fixes**
+  * hyperv: ensure WQL queries work in all locales
+    Relying on the "Description" field caused queries to fail on non-"en-US"
+    systems. The queries have been updated to avoid using localized strings.
 v6.8.0 (2020-10-01)
diff --git a/src/hyperv/hyperv_wmi_classes.h b/src/hyperv/hyperv_wmi_classes.h
index a19b6a656d..7465684d6e 100644
--- a/src/hyperv/hyperv_wmi_classes.h
+++ b/src/hyperv/hyperv_wmi_classes.h
@@ -44,10 +44,10 @@
-    "Description = \"Microsoft Virtual Machine\" "
+    "Name != __SERVER "
-    "Description = \"Microsoft Hosting Computer System\" "
+    "Name = __SERVER "
     "(EnabledState != 0 and EnabledState != 3 and EnabledState != 32769) "

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