release-notes: v0.3.0 release

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

release-notes.md

@@ -1,19 +1,98 @@
+- [v0.3.0](#v030)
+    + [Block device offloading](#block-device-offloading)
+    + [Network device backend](#network-device-backend)
+    + [Virtual sockets](#virtual-sockets)
+    + [HTTP based API](#http-based-api)
+    + [Memory mapped virtio transport](#memory-mapped-virtio-transport)
+    + [Paravirtualized IOMMU](#paravirtualized-iommu)
+    + [Ubuntu 19.10](#ubuntu-1910)
+    + [Guest large memory](#guest-large-memory)
 - [v0.2.0](#v020)
-	- [Network device offloading](#network-device-offloading)
-	- [Minimal hardware-reduced ACPI](#minimal-hardware-reduced-acpi)
-	- [Debug I/O port](#debug-io-port)
-	- [Improved direct device assignment](#improved-direct-device-assignment)
-	- [Improved shared filesystem](#improved-shared-filesystem)
-	- [Ubuntu bionic based CI](#ubuntu-bionic-based-ci)
+    + [Network device offloading](#network-device-offloading)
+    + [Minimal hardware-reduced ACPI](#minimal-hardware-reduced-acpi)
+    + [Debug I/O port](#debug-i-o-port)
+    + [Improved direct device assignment](#improved-direct-device-assignment)
+    + [Improved shared filesystem](#improved-shared-filesystem)
+    + [Ubuntu bionic based CI](#ubuntu-bionic-based-ci)
 - [v0.1.0](#v010)
-	- [Shared filesystem](#shared-filesystem)
-	- [Initial direct device assignment support](#initial-direct-device-assignment-support)
-	- [Userspace IOAPIC](#userspace-ioapic)
-	- [Virtual persistent memory](#virtual-persistent-memory)
-	- [Linux kernel bzImage](#linux-kernel-bzimage)
-	- [Console over virtio](#console-over-virtio)
-	- [Unit testing](#unit-testing)
-	- [Integration tests parallelization](#integration-tests-parallelization)
+    + [Shared filesystem](#shared-filesystem)
+    + [Initial direct device assignment support](#initial-direct-device-assignment-support)
+    + [Userspace IOAPIC](#userspace-ioapic)
+    + [Virtual persistent memory](#virtual-persistent-memory)
+    + [Linux kernel bzImage](#linux-kernel-bzimage)
+    + [Console over virtio](#console-over-virtio)
+    + [Unit testing](#unit-testing)
+    + [Integration tests parallelization](#integration-tests-parallelization)
+
+# v0.3.0
+
+This release has been tracked through the [0.3.0 project](https://github.com/intel/cloud-hypervisor/projects/3).
+
+Highlights for `cloud-hypervisor` version 0.3.0 include:
+
+### Block device offloading
+
+We continue to work on offloading paravirtualized I/O to external processes,
+and we added support for
+[vhost-user-blk](https://access.redhat.com/solutions/3394851) backends.
+This enables `cloud-hypervisor` users to plug a `vhost-user` based block device
+like [SPDK](https://spdk.io)) into the VMM as their paravirtualized storage
+backend.
+
+### Network device backend
+
+The previous release provided support for
+[vhost-user-net](https://access.redhat.com/solutions/3394851) backends. Now we
+also provide a TAP based vhost-user-net backend, implemented in Rust. Together
+with the vhost-user-net device implementation, this will eventually become the
+Cloud Hypervisor default paravirtualized networking architecture.
+
+### Virtual sockets
+
+In order to more efficiently and securely communicate between host and guest,
+we added an hybrid implementation of the
+[VSOCK](http://man7.org/linux/man-pages/man7/vsock.7.html) socket address
+family over virtio. Credits go to the
+[Firecracker](https://github.com/firecracker-microvm/firecracker/blob/master/docs/vsock.md)
+project as our implementation is a copy of theirs.
+
+### HTTP based API
+
+In anticipation of the need to support asynchronous operations to Cloud
+Hypervisor guests (e.g. resources hotplug and guest migration), we added a HTTP
+based API to the VMM. The API will be more extensively documented during the
+next release cycle.
+
+### Memory mapped virtio transport
+
+In order to support potential PCI-free use cases, we added support for the
+[virtio MMIO](https://docs.oasis-open.org/virtio/virtio/v1.1/cs01/virtio-v1.1-cs01.html#x1-1440002)
+transport layer. This will allow us to support simple, minimal guest
+configurations that do not require a PCI bus emulation.
+
+### Paravirtualized IOMMU
+
+As we want to improve our nested guests support, we added support for exposing
+a [paravirtualized IOMMU](https://github.com/intel/cloud-hypervisor/blob/master/docs/iommu.md)
+device through virtio. This allows for a safer nested virtio and directly
+assigned devices support.
+
+To add the IOMMU support, we had to make some CLI changes for Cloud Hypervisor
+users to be able to specify if devices had to be handled through this virtual
+IOMMU or not. In particular, the `--disk` option now expects disk paths to be
+prefixed with a `path=` string, and supports an optional `iommu=[on|off]`
+setting.
+
+### Ubuntu 19.10
+
+With the latest [hypervisor firmware](https://github.com/intel/rust-hypervisor-firmware),
+we can now support the latest
+[Ubuntu 19.10 (Eoan Ermine)](http://releases.ubuntu.com/19.10/) cloud images.
+
+### Large memory guests
+
+After simplifying and changing our guest address space handling, we can now
+support guests with large amount of memory (more than 64GB).
 
 # v0.2.0