RE: [PATCH Part2 v6 13/49] crypto:ccp: Provide APIs to issue SEV-SNP commands

[Kalra, Ashish]

[AMD Official Use Only - General]

>> There are actually only 8 functions

>Only 8?

>Lemme ask it differently then: what is the point of the wrappers at all?

They are basically providing the APIs for the hypervisor to manage a SNP guest.

And this is the original commit for the API to manage the SEV guest:

commit 200664d5237f3f8cd2a2f9f5c5dea08502336bd1
Author: Brijesh Singh <brijesh.singh@xxxxxxx>
Date:   Mon Dec 4 10:57:28 2017 -0600

    crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support
    
    AMD's new Secure Encrypted Virtualization (SEV) feature allows the
    memory contents of virtual machines to be transparently encrypted with a
    key unique to the VM. The programming and management of the encryption
    keys are handled by the AMD Secure Processor (AMD-SP) which exposes the
    commands for these tasks. The complete spec is available at:
    
    http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf
    
    Extend the AMD-SP driver to provide the following support:
    
     - an in-kernel API to communicate with the SEV firmware. The API can be
       used by the hypervisor to create encryption context for a SEV guest.
    
     - a userspace IOCTL to manage the platform certificates.
    
    Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
    Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx>
    Cc: Borislav Petkov <bp@xxxxxxx>
    Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
    Cc: Gary Hook <gary.hook@xxxxxxx>
    Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
    Cc: linux-crypto@xxxxxxxxxxxxxxx
    Cc: kvm@xxxxxxxxxxxxxxx
    Cc: linux-kernel@xxxxxxxxxxxxxxx
    Improvements-by: Borislav Petkov <bp@xxxxxxx>
    Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>


Thanks,
Ashish