On aarch64, the SMBIOS info of the Virtual Machines is not visible from inside the Guest. Even though its specified in the XML its inheriting the standard RHEL info (as if the host is RHEL KVM, not CNV):

System Information
	Manufacturer: Red Hat
	Product Name: KVM
	Version: RHEL 9.6.0 ARM Virtual Machine
	Serial Number: Not Specified
	UUID: 375ee8ed-a6f3-47a8-8f36-71ac7bb9f960
	Wake-up Type: Power Switch
	SKU Number: Not Specified
	Family: Red Hat Enterprise Linux

But it should look like this:

System Information
	Manufacturer: Red Hat
	Product Name: OpenShift Virtualization
	Version: 4.20.1
	Serial Number: c43b961b-46e1-47d3-acd6-da4e891eface
	UUID: 375ee8ed-a6f3-47a8-8f36-71ac7bb9f960
	Wake-up Type: Power Switch
	SKU Number: 4.20.1
	Family: Red Hat

4.20

Always

1. Start an aarch64 VM
2. dmidecode -t system

Standard RHEL info shown, serial missing

OpenShift Virtualization details with serial (if set)

It seems the firmware on aarch64 behaves a bit different. On pure RHEL 9.6 KVM I need to add the below to the XML to make it wire the information in:

<os firmware='efi'>
  <smbios mode='sysinfo'/>
</os>

Otherwise it goes missing.

For example, only this doesn't work, its all ignored:

  <sysinfo type='smbios'>
    <system>
      <entry name='manufacturer'>Red Hat</entry>
      <entry name='product'>OpenShift Virtualization</entry>
      <entry name='version'>4.20.1</entry>
      <entry name='serial'>c43b961b-46e1-47d3-acd6-da4e891eface</entry>
      <entry name='uuid'>375ee8ed-a6f3-47a8-8f36-71ac7bb9f960</entry>
      <entry name='sku'>4.20.1</entry>
      <entry name='family'>Red Hat</entry>
    </system>
  </sysinfo>

We need this for it to show in the VM

  <sysinfo type='smbios'>
    <system>
      <entry name='manufacturer'>Red Hat</entry>
      <entry name='product'>OpenShift Virtualization</entry>
      <entry name='version'>4.20.1</entry>
      <entry name='serial'>c43b961b-46e1-47d3-acd6-da4e891eface</entry>
      <entry name='uuid'>375ee8ed-a6f3-47a8-8f36-71ac7bb9f960</entry>
      <entry name='sku'>4.20.1</entry>
      <entry name='family'>Red Hat</entry>
    </system>
  </sysinfo>
  <os firmware='efi'>
    ...
    <smbios mode='sysinfo'/>
  </os>