Hotplug Memory Reporting Mismatch in Windows Guest OS

Problem

• When configuring Hotplug memory in a VM, the memory reported inside the Windows VM shows the maximum hotplug range instead of the configured hotplug memory value.

• Example: With Hotplug RAM = 8 GB and Max Hotplug RAM = 64 GB, the Windows VM reports 64 GB instead of 8 GB.

Environment

• Private Cloud Director Virtualization - v2025.4 and Higher

• Self-Hosted Private Cloud Director Virtualization - v2025.4 and Higher

Cause

This is a reporting mismatch inside Windows guests when the configured Hotplug RAM is less than the Max Hotplug RAM.

• The VM is presented with the maximum hotplug range, which Windows reports as total memory.

• Actual usable memory remains aligned to the configured hotplug value but may not be correctly displayed in Windows Resource Manager.

Workaround

• In some cases, performing a VM reboot may help the guest OS reflect the correct usable memory.

• If the issue persists, a practical workaround is to configure the VM with Hotplug RAM = Max Hotplug RAM so that Windows reports the expected value.

Additional Information

This behavior is currently under review by the engineering team, and the enhancement is planned to be available in future releases of PCD under PCD-2855.