Open Attestation is a project aim to enable basic open sourced SDK with Intel 
TXT technology to get node's trustworthiness in a cloud usage environment. 
Integration Open Attestation with Ovirt will definitely provide a more secure 
cloud ecosystem which will give end user a choice of whether guest virtual 
machine need launch on a trusted host server or not. 

Initially, we want to attest the host's trustworthiness every time when every 
guest virtual machine launch on the host, thanks to Doron Fediuck's reminding, 
we just need attest the host at the first request and cache the result for 
subsequent requests is enough, further, we want to bring down server's response 
time in case of large concurrence request. To resolve/improve engine's 
performance, we decide to tackle this issue by caching all of node's 
trustworthiness while the first guest virtual machine's launching, this will 
take a little longer before its running. Node's trustworthiness would be stored 
in database or just in system memory, the value will be effective within one 
hour or so, of course, the period of validity could be configured, node's 
status need to be updated in the case of end user reboot the virtual machine 
and the duration exceed valid time. 

Does this acceptable and any good suggestion?

Some details can be found in this link: 
http://wiki.ovirt.org/Trusted_compute_pools


Best Regards,
Dave Chen


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