Implementation of vCPU crate

CODEOWNERS

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+# Default owners for everything in the repo. Later matches take precedence.
+* @jennymankin

Cargo.toml

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+[package]
+name = "vmm-vcpu"
+version = "0.1.0"
+authors = ["Jenny Mankin <jenny.mankin@crowdstrike.com>", 
+           "Timo Kreuzer <timo.kreuzer@reactos.org>",
+           "Alessandro Pilotti <apilotti@cloudbasesolutions.com>"]
+description = "Hypervisor-agnostic abstraction crate over virtual CPU functionality"
+repository = "https://github.com/rust-vmm/vmm-vcpu"
+readme = "README.md"
+license = "Apache-2.0 or MIT"
+
+[dependencies]
+byteorder = "*"
+
+[target.'cfg(unix)'.dependencies]
+kvm-bindings = "0.1"
+
+[target.'cfg(unix)'.dev-dependencies]
+kvm-ioctls = "0.1.0"
+
+libc = ">=0.2.39"

LICENSE-APACHE

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LICENSE-MIT

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+Permission is hereby granted, free of charge, to any
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+DEALINGS IN THE SOFTWARE.
+

README.md

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-# vmm-vcpu
+# vmm-vcpu
+
+A library to provide a hypervisor-agnostic abstraction on top of Virtual CPU (vCPU)
+functionality.
+
+## Platform Support
+
+* Arch: x86, AMD64, ARM64
+* Operating System: Unix/Linux/Windows
+
+## Usage
+
+The `vmm-vcpu` crate is not functional standalone, but should be used to implement
+hypervisor-specific virtual CPU functionality. In order to create an 
+implementation of the `vmm-vcpu` crate to be consumed by VMMs:
+
+First, add the following to `Cargo.toml`:
+
+```
+vmm-vcpu = "0.1"
+```
+
+Next, add the following to the crate root:
+
+```
+extern crate vmm-vcpu
+```
+
+Then, implement each of the functions of the `Vcpu` trait. Any irrelevant/
+unused functions can be completed with the `unimplemented!();` macro.
+
+## Design
+
+The `vmm-vcpu` crate itself is quite simple, requiring only exposing a public
+`Vcpu` trait with the functions that comprise common vCPU functionality, as
+well as exported wrappers on top of common data structures (including 
+generically named structures wrapping data structures from `kvm_bindings` when 
+architecturally, rather than hypervisor, specific.)
+
+## License
+
+This project is licensed under either of:
+
+* Apache License, Version 2.0 (LICENSE-APACHE or (https://www.apache.org/licenses/LICENSE-2.0))
+
+* MIT license (LICENSE-MIT or (https://opensource.org/licenses/MIT))

THIRD-PARTY

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+// Copyright 2017 The Chromium OS Authors. All rights reserved.
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/arm.rs

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+// Copyright 2018-2019 CrowdStrike, Inc.
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+/// ARM-specific data structures.
+
+///
+/// Type of CPU to present to the guest, and the optional features it should have.
+///
+#[cfg(windows)]
+pub struct VcpuInit {
+    pub target: u32,
+    pub features: [u32; 7usize],
+}
+
+#[cfg(unix)]
+pub use kvm_bindings::kvm_vcpu_init as VcpuInit;

src/lib.rs

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+// Copyright 2018-2019 CrowdStrike, Inc.
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+#![allow(unused)]
+#![deny(missing_docs)]
+
+//! A generic abstraction around virtual CPU (vCPU) functionality
+//!
+//! This crate offers a trait abstraction for vCPUs, as well as architecture
+//! and platform-dependent structure definitions necessary for vCPU functions.
+//!
+//! # Platform support
+//!
+//! - x86_64
+//! - arm64 (experimental)
+//!
+
+/// Module defining vCPU trait and required data structures
+pub mod vcpu;
+
+#[cfg(unix)]
+extern crate kvm_bindings;
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+/// Module defining x86_64 architecture-dependent structures
+pub mod x86_64;
+
+#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
+/// Module defining arm architecture-dependent structures
+pub mod arm;