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@kiranchavala
Description
problem
Unable to add more than 2 volume or network to a vm deployed from a UEFI image
versions
ACS 4.20.1
The steps to reproduce the bug
- Register a UEFI image Template
https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
- Deploy the vm by enabling UEFI secure mode in advanced settings
- Once the vm is in running state , attach multiple volumes , Exception observed
Logs
2025年07月16日 04:28:28,947 DEBUG [kvm.storage.KVMStorageProcessor] (AgentRequest-Handler-3:[]) (logid:) Attaching device: <disk device='disk' type='file'>
<driver name='qemu' type='qcow2' cache='none' />
<source file='/mnt/7b881182-e6d4-3e65-bf10-662bf0530b84/c6ef61d1-300f-442a-86e5-e31f482b64ab'/>
<target dev='vdc' bus='virtio'/>
<serial>c6ef61d1300f442a86e5</serial>
</disk>
2025年07月16日 04:28:28,953 WARN [kvm.storage.KVMStorageProcessor] (AgentRequest-Handler-3:[]) (logid:) Failed to attach device to i-2-653-VM: internal error: No more available PCI slots
2025年07月16日 04:28:28,953 DEBUG [kvm.storage.KVMStorageProcessor] (AgentRequest-Handler-3:[]) (logid:) Failed to attach volume [id: 394, uuid: c6ef61d1-300f-442a-86e5-e31f482b64ab, name: test2, path: c6ef61d1-300f-442a-86e5-e31f482b64ab], due to org.libvirt.LibvirtException: internal error: No more available PCI slots
- Try to attach multiple networks, Exception observed
2025年07月16日 04:36:02,019 DEBUG [kvm.resource.BridgeVifDriver] (AgentRequest-Handler-1:[]) (logid:) Successfully executed process [2045246] for command [/usr/share/cloudstack-common/scripts/vm/network/vnet/modifyvlan.sh -v 2144 -p eth1 -b breth1-2144 -o add ].
2025年07月16日 04:36:02,021 WARN [resource.wrapper.LibvirtPlugNicCommandWrapper] (AgentRequest-Handler-1:[]) (logid:) Plug Nic failed due to org.libvirt.LibvirtException: internal error: No more available PCI slots org.libvirt.LibvirtException: internal error: No more available PCI slots
at org.libvirt.ErrorHandler.processError(Unknown Source)
at org.libvirt.ErrorHandler.processError(Unknown Source)
Workaround
Change the following settings on the vm after stopping
nicAdapter to e1000 or rtl813
rootDiskController to scsi or sata
What to do about it?
If the Template is a UEFI enabled , Cloudstack should check if the template is UEFI enabled or not and populated the necessary settings for root disk and nic adapter
yum install libguestfs-tools
virt-inspector --format=raw -a noble-server-cloudimg-amd64.img 2>/dev/null | grep -i 'true'
virt-inspector -a AlmaLinux-8-GenericCloud-UEFI-latest.x86_64.qcow2 2>/dev/null | grep -i 'true'
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