Failed to Deploy VM： unsupported emulator machine type

[shiba9967]

When deploying a VM via VME, deployment fails with the following error:

Error Defining VM via libvirt: error: Failed to define domain from xxx (VM xml)
error: unsupported configuration: Emulator '/usr/bin/qemu-system-x86_64' does not support machine type 'pc-q35-8.2'

The host configuration is as follows:

• Ubuntu 22.04
• hpe-vm 1.0.5
• qemu-system-x86 (jammy-updates), version 1:6.2+dfsg-2ubuntu6.26 amd64 [installed]

The guest OS configuration is:

• CentOS 7
• virtio is installed
• qemu guest agent is installed

After deployment fails, if I SSH into the host OS and manually edit the XML, the VM can boot successfully.

Before modification:
　　<type arch='x86_64' machine='pc-q35-8.2'>hvm</type>
　　<controller type='pci' model='pcie-root-port' index='9'/>

After modification:
　　<type arch='x86_64'>hvm</type>
　　<!-- The controller line has been removed -->

The default QEMU machine types are as follows, and specifying one of these default types allows the VM to start without issues:
# qemu-system-x86_64 -machine ?
Supported machines are:
pc-i440fx-jammy Ubuntu 22.04 PC (i440FX + PIIX, 1996) (default)

It appears that the machine type and PCI controller are being automatically set during deployment, causing the failure.
Because manually editing the XML file every time after deployment is troublesome, is there a solution to make the deployment succeed correctly without manual intervention?

[georgek_1 · Accepted solution]

Hello shiba9967,

Please note that CentOS 7 is not supported as Guest OS while CentOS 8 is the min. supported version.

Also, the qemu available with Ubuntu is 6.2.0 (can be verified with # qemu-system-x86_64 --version) will not support machine type 'pc-q35-8.2' .
This can be verified with # qemu-system-x86_64 -machine help.

Ubuntu version 24.04 has qemu version 8.2.2 .

# qemu-system-x86_64 --version
QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.6)

This version of QEMU will support pc-q35-8.2

# qemu-system-x86_64 -machine help
Supported machines are:
microvm              microvm (i386)
...
pc-q35-8.2           Standard PC (Q35 + ICH9, 2009) ==>
pc-q35-8.1           Standard PC (Q35 + ICH9, 2009)

[support_s]

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[shiba9967]

Thank you for your reply.

The issue was resolved by upgrading to Ubuntu 24.04.

I selected "HPE VM 1.2 Cluster on Existing Ubuntu 24.04," but since there was a host with Ubuntu 22.04, an error occurred during the machine type selection.
( It seems that "HPE VM 1.2 Cluster on Existing Ubuntu 24.04" sets and deploys the machine type to pc-q35-8.2 by default. )

Best regards,

Please accept my apologies if there are any inappropriate expressions due to machine translation.

[Thaufique_Mod]

Hello @shiba9967,

That's great!

We are glad to hear that, and we appreciate your efforts. Please feel free to accept the solution and to give Kudos.