Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.. SPDX-License-Identifier: GPL-2.0
+
+ACRN Hypervisor Introduction
+============================
+
+The ACRN Hypervisor is a Type 1 hypervisor, running directly on bare-metal
+hardware. It has a privileged management VM, called Service VM, to manage User
+VMs and do I/O emulation.
+
+ACRN userspace is an application running in the Service VM that emulates
+devices for a User VM based on command line configurations. ACRN Hypervisor
+Service Module (HSM) is a kernel module in the Service VM which provides
+hypervisor services to the ACRN userspace.
+
+Below figure shows the architecture.
+
+::
+
+                Service VM                    User VM
+      +----------------------------+  |  +------------------+
+      |        +--------------+    |  |  |                  |
+      |        |ACRN userspace|    |  |  |                  |
+      |        +--------------+    |  |  |                  |
+      |-----------------ioctl------|  |  |                  |   ...
+      |kernel space   +----------+ |  |  |                  |
+      |               |   HSM    | |  |  | Drivers          |
+      |               +----------+ |  |  |                  |
+      +--------------------|-------+  |  +------------------+
+  +---------------------hypercall----------------------------------------+
+  |                         ACRN Hypervisor                              |
+  +----------------------------------------------------------------------+
+  |                          Hardware                                    |
+  +----------------------------------------------------------------------+
+
+ACRN userspace allocates memory for the User VM, configures and initializes the
+devices used by the User VM, loads the virtual bootloader, initializes the
+virtual CPU state and handles I/O request accesses from the User VM. It uses
+ioctls to communicate with the HSM. HSM implements hypervisor services by
+interacting with the ACRN Hypervisor via hypercalls. HSM exports a char device
+interface (/dev/acrn_hsm) to userspace.
+
+The ACRN hypervisor is open for contribution from anyone. The source repo is
+available at https://github.com/projectacrn/acrn-hypervisor.