Add self introduction file for LoongArch virtual machine.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Dongyan Qian <qiandongyan@loongson.cn>
Signed-off-by: Chao Li <lichao@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
---
 OvmfPkg/LoongArchVirt/Readme.md | 67 +++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 OvmfPkg/LoongArchVirt/Readme.md

diff --git a/OvmfPkg/LoongArchVirt/Readme.md b/OvmfPkg/LoongArchVirt/Readme.md
new file mode 100644
index 0000000000..57fc74c296
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Readme.md
@@ -0,0 +1,67 @@
+# LoongArch QEMU virt platform
+
+## Overview
+
+  LoongArch QEMU virt is a generic platform that dose not require any actual hardware.
+  The minimum required QEMU version is [8.1](https://gitlab.com/qemu-project/qemu/-/tags), the minimum required GCC version is [GCC13](https://gcc.gnu.org/gcc-13/), the minimum required Binutils version is [2.40](https://ftp.gnu.org/gnu/binutils/).
+
+## Prepare (X86 Linux Environment)
+
+### Fedora39
+Install LoongArch64 cross compiler, LoongArch system QEMU.
+
+    yum install gcc-loongarch64-linux-gnu
+    yum install qemu-system-loongarch64
+
+### Others X86 OS ENV
+#### Configure cross-tools
+
+**Download:**
+
+    wget https://github.com/loongson/build-tools/releases/download/2023.08.08/x86_64-cross-tools-loongarch64-binutils_2.41-gcc_13.2.0.tar.xz
+
+**Configure the cross-tools environment:**
+
+    mkdir /opt/loongarch64_cross-toolchain/
+    tar -vxf x86_64-cross-tools-loongarch64-binutils_2.41-gcc_13.2.0.tar.xz -C /opt/loongarch64_cross-toolchain/
+    export PATH=/opt/loongarch64_cross-toolchain/cross-tools/bin:$PATH
+
+Note: Please obtain [the latest cross-compilation](https://github.com/loongson/build-tools) toolchains.
+
+#### Build QEMU
+
+    git clone https://gitlab.com/qemu-project/qemu.git
+
+Note: Please refer to QEMU compilation rules, located in qemu/doc/system/loongarch/virt.rst.
+
+
+## Build LoongArch QEMU virtual machine firmware
+#### Get edk2 resouces
+
+    git clone --recurse-submodule https://github.com/tianocore/edk2.git
+
+#### Building LoongArch QEMU virt FW with GCC
+
+    export WORKSPACE=`pwd`
+    export GCC5_LOONGARCH64_PREFIX=loongarch64-unknown-linux-gnu-
+    export PACKAGES_PATH=$WORKSPACE/edk2
+    export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
+    source edk2/edksetup.sh --reconfig
+    make -C edk2/BaseTools
+    source edk2/edksetup.sh BaseTools
+    build -b RELEASE -t GCC5 -a LOONGARCH64 -p OvmfPkg/LoongArchVirt/LoongArchVirtQemu.dsc
+
+## Test LoongArch QEMU virtual machine firmware
+    qemu-system-loongarch64 \
+    -m 4G \
+    -M virt \
+    -smp 2 \
+    -cpu la464 \
+    -bios Build/LoongArchVirtQemu/RELEASE_GCC5/FV/QEMU_EFI.fd \
+    -serial stdio
+
+## Test LoongArch QEMU virtual machine OS
+
+* Download ArchLinux QCOW [images](https://mirrors.pku.edu.cn/loongarch/archlinux/images) for LoongArch.
+
+* [Running LoongArch ArchLinux on virtual machine](https://mirrors.pku.edu.cn/loongarch/archlinux/images/README.html).
-- 
2.27.0



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