hypervisor: Add KVM implementation

For each of the traits we are defining kvm related structures
and add the trait implementation to the structs. For more information
please see the kvm-ioctls and kvm-bindings crate.

This is a standalone implementation that does not include the switch of
the Cloud-Hypervisor vmm and arch crates to it.

Signed-off-by: Muminul Islam <muislam@microsoft.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

hypervisor/src/kvm/aarch64/mod.rs

@@ -0,0 +1,20 @@
+// Copyright © 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2020, Microsoft  Corporation
+//
+
+///
+/// Export generically-named wrappers of kvm-bindings for Unix-based platforms
+///
+use crate::kvm::{KvmError, KvmResult};
+use serde_derive::{Deserialize, Serialize};
+pub use {kvm_ioctls::Cap, kvm_ioctls::Kvm};
+
+pub fn check_required_kvm_extensions(kvm: &Kvm) -> KvmResult<()> {
+    if !kvm.check_extension(Cap::SignalMsi) {
+        return Err(KvmError::CapabilityMissing(Cap::SignalMsi));
+    }
+    Ok(())
+}