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Re: [RFC PATCH 0/6] Add AMD Secure Nested Paging (SEV-SNP) support

From: Brijesh Singh
Subject: Re: [RFC PATCH 0/6] Add AMD Secure Nested Paging (SEV-SNP) support
Date: Tue, 13 Jul 2021 09:01:21 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 


On 7/13/21 3:05 AM, Dov Murik wrote:>

Particularly confusing is the `policy` attribute which is only relevant
for SEV / SEV-ES, while there's a new `snp.policy` attribute for SNP...
Maybe the irrelevant attributes should not be added to the tree when not
in SNP.


The policy fields are also applicable to the SNP. The main difference are:
- in SEV/SEV-ES the policy is 32-bit compare to 64-bit value in SEV-SNP. However, for SEV-SNP spec uses lower 32-bit value and higher bits are marked reserved. 

- the bit field meaning are different

Based on this, we can introduce a new filed 'snp-policy'.

-Brijesh
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