GitHub user gvaishya created a discussion: vm deployement failing on apache 
cloud statck 4.20.2

### problem

The long description of your apache cloud stack version: 4.20.2.0

OS : redhat 8.10

Hypervisor: KVM

two hosts in a cluster and below is the CPU configuration
CPU: 2 * AMD EPYC 7C13 64-Core Processor 



we have created a apache cloud stack on 4.20.2.0 and when we are creating a new 
vm with unconstrained offering its failing with below error


2026-08-05 17:38:03,289 WARN  [resource.wrapper.LibvirtStartCommandWrapper] 
(AgentRequest-Handler-4:[]) (logid:) LibvirtException 
org.libvirt.LibvirtException: unsupported configuration: more than 255 vCPUs 
require extended interrupt mode enabled on the iommu device

2026-08-05 17:41:21,475 WARN  [kvm.resource.LibvirtKvmAgentHook] 
(AgentRequest-Handler-2:[]) (logid:) Groovy scripting engine is not 
initialized. Data transformation skipped.
2026-08-05 17:41:21,503 WARN  [resource.wrapper.LibvirtStartCommandWrapper] 
(AgentRequest-Handler-2:[]) (logid:) LibvirtException 
org.libvirt.LibvirtException: unsupported configuration: Maximum CPUs greater 
than specified machine type limit 240
at org.libvirt.ErrorHandler.processEr


### versions

4.20.2.0

### The steps to reproduce the bug

1.
2.
3.
...


### What to do about it?

The long description of your apache cloud stack version: 4.20.2.0

OS : redhat 8.10

Hypervisor: KVM

two hosts in a cluster and below is the CPU configuration
CPU: 2 * AMD EPYC 7C13 64-Core Processor 



we have created a apache cloud stack on 4.20.2.0 and when we are creating a new 
vm with unconstrained offering its failing with below error


2026-08-05 17:38:03,289 WARN  [resource.wrapper.LibvirtStartCommandWrapper] 
(AgentRequest-Handler-4:[]) (logid:) LibvirtException 
org.libvirt.LibvirtException: unsupported configuration: more than 255 vCPUs 
require extended interrupt mode enabled on the iommu device

2026-08-05 17:41:21,475 WARN  [kvm.resource.LibvirtKvmAgentHook] 
(AgentRequest-Handler-2:[]) (logid:) Groovy scripting engine is not 
initialized. Data transformation skipped.
2026-08-05 17:41:21,503 WARN  [resource.wrapper.LibvirtStartCommandWrapper] 
(AgentRequest-Handler-2:[]) (logid:) LibvirtException 
org.libvirt.LibvirtException: unsupported configuration: Maximum CPUs greater 
than specified machine type limit 240
at org.libvirt.ErrorHandler.processEr


GitHub link: https://github.com/apache/cloudstack/discussions/13802

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