content: Add documentation for preparing QEMU for CH

CH is abbreviated from Cloud-Hypervisor, this document is used to
prepare the development environment for CH on RISC-V 64-bit.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

Author: RuoqingHe

src/virtualization/cloud-hypervisor/heterogeneous-runner.md

@@ -0,0 +1,77 @@
+# Heterogeneous Runner
+
+RISC-V SoC with H ext. and AIA equipped is not available at the time of writing
+(Oct 22nd 2024), so I conduct my development of RISC-V virtualization software
+stack on virtual machines emulated by QEMU (v9.1.0), on x86_64 hosts.
+
+## Setup
+
+### Host
+
+Output of `neofetch`:
+
+```
+❯ neofetch
+            .-/+oossssoo+/-.               root@cloud-hypervisor-riscv64
+        `:+ssssssssssssssssss+:`           -----------------------------
+      -+ssssssssssssssssssyyssss+-         OS: Ubuntu 24.04.1 LTS x86_64
+    .ossssssssssssssssssdMMMNysssso.       Host: MS-7E16 1.0
+   /ssssssssssshdmmNNmmyNMMMMhssssss/      Kernel: 6.8.0-47-generic
+  +ssssssssshmydMMMMMMMNddddyssssssss+     Uptime: 3 days, 21 hours, 26 mins
+ /sssssssshNMMMyhhyyyyhmNMMMNhssssssss/    Packages: 909 (dpkg)
+.ssssssssdMMMNhsssssssssshNMMMdssssssss.   Shell: bash 5.2.21
++sssshhhyNMMNyssssssssssssyNMMMysssssss+   Terminal: /dev/pts/0
+ossyNMMMNyMMhsssssssssssssshmmmhssssssso   CPU: AMD Ryzen 9 9950X (32) @ 7.487GHz
+ossyNMMMNyMMhsssssssssssssshmmmhssssssso   GPU: AMD ATI 15:00.0 Device 13c0
++sssshhhyNMMNyssssssssssssyNMMMysssssss+   Memory: 3444MiB / 61876MiB
+.ssssssssdMMMNhsssssssssshNMMMdssssssss.
+ /sssssssshNMMMyhhyyyyhdNMMMNhssssssss/
+  +sssssssssdmydMMMMMMMMddddyssssssss+
+   /ssssssssssshdmNNNNmyNMMMMhssssss/
+    .ossssssssssssssssssdMMMNysssso.
+      -+sssssssssssssssssyyyssss+-
+        `:+ssssssssssssssssss+:`
+            .-/+oossssoo+/-.
+```
+
+I'm using Ubuntu 24.04 LTS so I guess there would not be any serious blockers if
+you use this version or any version above that. And I suggest you to pick a CPU
+with high frequency, since we are going to emulate a heterogeneous virtual
+machine, you are going to need it :)
+
+#### QEMU
+
+Generally we need to check against the upstream QEMU for features/fixes we need,
+since RISC-V is still under heavy development, bugs like passing the wrong
+`hart id` could happen, and features like `aia` or `iommu` which we very much
+interested could develop, just visit https://github.com/qemu/qemu to find out
+which version meets your requirement.
+
+Below is the steps took to install QEMU manually:
+
+```sh
+# Install dependencies to build and run QEMU
+DEBIAN_FRONTEND="noninteractive" apt-get install --no-install-recommends -y \
+    git python3 python3-pip ninja-build build-essential pkg-config curl bc jq \
+    libslirp-dev libfdt-dev libglib2.0-dev libssl-dev libpixman-1-dev \
+    flex bison
+
+# Clone QEMU source code repository
+git clone --depth 1 --branch v9.1.0 https://gitlab.com/qemu-project/qemu.git
+
+
+pushd qemu
+# Prepare directory to for QEMU to be installed
+mkdir -p /opt/qemu
+# Build and install QEMU
+./configure --prefix=/opt/qemu && make -j$(nproc)
+# This requires root privilege
+sudo make install
+popd
+# Clean up
+rm -rf qemu
+
+# Add line below to your .bashrc (.zshrc or scripts in profile.d/ whatever)
+export PATH=$PATH:/opt/qemu/bin
+. .bashrc
+```