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OLVM: guest OS of VM Fails to Hot Plug Memory: unaligned hotplug range (Doc ID 2819511.1)

Last updated on FEBRUARY 18, 2025

Applies to:

Linux OS - Version Oracle Linux 7.9 with Unbreakable Enterprise Kernel [5.4.17] and later
Linux x86-64

Symptoms

Adding memory to up running Linux VM on OLVM BUI without issue, however errors found inside guest OS that hot plug memory fails:
# dmesg
(snip)
[ 158.763845] Block size [0x40000000] unaligned hotplug range: start 0x1948000000, size 0xef8000000
[ 158.763848] acpi PNP0C80:01: add_memory failed
[ 158.765321] acpi PNP0C80:01: acpi_memory_enable_device() error
[ 158.765786] acpi PNP0C80:01: Enumeration failure
(snip)

Changes

In this sample, guest OS of Linux VM has Memory block size 1024 MB:

 

However the attempted hotplug memory size 0xef8000000 is 61312 MB, not aligned with 1024 MB.

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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