doc: Add new feature in v0.2 release note

Add new feature list and description in v0.2 release note.

Signed-off-by: Xie, nanlin <nanlin.xie@intel.com>

doc/release_notes_0.2.rst

@@ -17,8 +17,89 @@ ACRN device model, and documentation.
 Version 0.2 new features
 ************************
 
+VT-x, VT-d
+================
+Based on Intel VT-x virtualization technology, ACRN emulates a virtual 
+CPU with core partition and simple schedule. VT-d provides hardware 
+support for isolating and restricting device accesses to the owner of 
+the partition managing the device.It allows assigning I/O devices to a VM, 
+and extending the protection and isolation properties of VMs for I/O operations.
+
+PIC/IOAPIC/MSI/MSI-X/PCI/LAPIC
+================================
+ACRN hypervisor supports virtualized APIC-V/EPT/IOAPIC/LAPIC functionality.
+
+Ethernet
+================
+ACRN hypervisor supports virtualized Ethernet functionality. Ethernet Mediator is 
+executed in the Service OS and provides packet forwarding between the physical 
+networking devices (Ethernet, Wi-Fi, etc.) and virtual devices in the Guest 
+VMs(also called "User OS"). Virtual Ethernet device could be shared by Linux, 
+Android, and Service OS guests for regular (i.e. non-AVB) traffic. All hypervisor 
+para-virtualized I/O is implemented using the VirtIO specification Ethernet pass-through.
+
+Storage (eMMC)
+================
+ACRN hypervisor supports virtualized non-volatile R/W storage for the Service 
+OS and Guest OS instances, supporting VM private storage and/or storage shared 
+between Guest OS instances.
+
+USB (xDCI)
+================
+ACRN hypervisor supports virtualized assignment of all USB xHCI and/or xDCI 
+controllers to a Guest OS from the platform.
+
+USB Mediator (xHCI and DRD)
+===========================
+ACRN hypervisor supports a virtualized USB Mediator.
+
+CSME
+================
+ACRN hypervisor supports a CSME to a single Linux, Android, or RTOS guest or 
+the Service OS even when in a virtualized environment.
+
+WiFi
+================
+ACRN hypervisor supports the passthrough assignment of the WiFi subsystem to the IVI, 
+enables control of the WiFi as an in-vehicle hotspot for 3rd party devices, 
+provides 3rd party device applications access to the vehicle, 
+and provides access of 3rd party devices to the TCU provided connectivity.
+
+IPU (MIPI-CS2, HDMI-in)
+========================
+ACRN hypervisor supports passthrough IPU assignment to Service OS or 
+guest OS, without sharing.
+
+Bluetooth
+================
+ACRN hypervisor supports bluetooth controller passthrough to a single Guest OS (IVI).
+
+GPU  – Preemption
+==================
+GPU Preemption is one typical automotive use case which requires
+the system to preempt GPU resources occupied by lower priority
+workloads.  This is done to ensure performance of the most critical
+workload can be achieved. Three different schedulers for the GPU
+are involved: i915 UOS scheduler, Mediator GVT scheduler, and
+i915 SOS scheduler.
+
+GPU – display surface sharing via Hyper DMA
+============================================
+Surface sharing is one typical automotive use case which requires 
+that the SOS accesses an individual surface or a set of surfaces 
+from the UOS without having to access the entire frame buffer of 
+the UOS. Hyper DMA Buffer sharing extends the Linux DMA buffer 
+sharing mechanism where one driver is able to share its pages 
+with another driver within one domain.
+
+S3
+================
+ACRN hypervisor supports S3 feature, partially enabled in LaaG.
+
+
 Fixed Issues
-============
+************
+
 :acrn-issue:`663` - Black screen displayed after booting SOS/UOS
 
 :acrn-issue:`676` - Hypervisor and DM version numbers incorrect