GitHub user weizhouapache added a comment to the discussion: Request for 
SEV-SNP Support in CloudStack for Enhanced Virtualization Security

from https://libvirt.org/kbase/launch_security_sev.html
you need to add an extra config for vm
```
  <launchSecurity type='sev'>
    <cbitpos>47</cbitpos>
    <reducedPhysBits>1</reducedPhysBits>
    <policy>0x0003</policy>
  </launchSecurity>
```

you can refer to 
https://www.shapeblue.com/cloudstack-feature-first-look-enable-sending-of-arbitrary-configuration-data-to-vms/
 on hot to add extra config to a vm.



GitHub link: 
https://github.com/apache/cloudstack/discussions/9912#discussioncomment-12794076

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