arm64: initial support for CCA in specification and parser

[jiong-microsoft]

This PR extends 'igvm_def' and 'igvm' crates to support ARM64 CCA.

igvm_def:

• New IgvmPlatformType::CCA and associated IGVM_CCA_PLATFORM_VERSION.
• New CcaPolicy to be used with IGVM_VHS_GUEST_POLICY.
• CCA VpContext follows the convention used by VbsVPContext: a fixed header followed by a list of registers, this gives flexibility on configuring registers' initial value.

igvm:

• updated a few places to recognize the new CCA platform

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[chris-oo]

Is it possible to have more links to the corresponding ARM specification for each header?

[chris-oo]

To confirm, in the CCA spec these are the only registers that can be set and are measured? Is it possible to include a link to the spec in the header definition?

[jiong-microsoft]

Yes, x0 ~ x7, pc are the only registers contribute to RIM (realm initial measurement), but there is also another 64-bit flags contribute to RIM which we should adds, I will update the PR. The comment will contain links to RMM doc, unfortunately there is permanent doc link, so I can only mention the section number but guess is enough for locating the spec

/// Format of [IGVM_VHS_VP_CONTEXT] file data for a native ARM64 CCA image.
///
/// The VP Context corresponds to the REC (Realm Execution Context) in CCA.
/// Therefore, the fields listed below match those defined in the RMM
/// specification, section "B4.6.69 RmiRecParams type".
///
/// These include the general-purpose registers x0–x7, the PC register,
/// and a 64-bit flags field. All of these fields contribute to the
/// RIM (Realm Initial Measurement).
///
/// One exception is mpidr, which is not included here because it is
/// determined by the host and does not need to be specified in the
/// IGVM file.
///
/// Any registers not explicitly specified here are initialized to their
/// architectural reset values.

[chris-oo]

could this be an open_enum type instead?

[jiong-microsoft]

good catch!

[chris-oo]

We are trying to move away from this overloaded guest policy header and back to a single header per-platform for each architectural state. I'll post a PR later today/tomorrow you can see what I think we should do instead.