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+pH Hypervisor
+=============
+
+pH is a KVM hypervisor for Linux written in the Rust programming language as a tool
+for isolating desktop application running environments in Subgraph OS.
+
+Building pH
+-----------
+
+    $ sudo apt install wget bc libelf-dev pkg-config libwayland-dev libxcb-composite0-dev libxkbcommon-dev libgbm-dev libpixman-1-dev libdrm-dev libdbus-1-dev
+    $ cargo build --release
+
+Running pH
+----------
+
+After successfully building pH the only artifact you need is the pH binary itself. You can copy it
+anywhere any use it.
+
+If you run pH in citadel, you can simply pass it the name of a realm:
+
+    $ ./pH --realm main
+
+This will use the correct realmfs image as a block device for the root filesystem and
+mount the realm home directory as a 9p filesystem.
+
+Without any arguments, pH will self-host on the current filesystem by mounting the
+root directory as a read-only 9p filesystem. Currently it is assumed that the
+home directory is /home/user and if you have a different home directory you'll
+need to tell pH about it:
+
+    $ ./pH --home /home/citadel
+
+By default a shell inside the pH instance will be launched as the user account, 
+but you can also add --root flag to launch a root shell instead:
+
+    $ ./pH --home /home/citadel --root
+
+Devices
+-------
+
+The hardware emulation in pH consists of a minimal set of small legacy devices needed to 
+boot the system as well as several Virtio devices.  Virtio is a standard interface
+for efficient communication between a guest operating system and a hypervisor such that
+the same guest drivers will work with any hypervisor implemention of the emulated
+virtio devices.
+
+
+### virtio-block
+
+A block device driver.
+
+#### Disk Images
+
+Raw ext4 disk images are supported, as well as realmfs images, but currently they
+are not mounted with dm-verity.
+
+### virtio-9p
+
+A 9P filesystem server which can be used to mount filesystem trees on the host into
+the guest.
+
+### virtio-rng
+
+Provides entropy from /dev/urandom on the host to the guest.
+
+### virtio-serial
+
+A serial port device which is used to provide an interactive console on the guest.
+
+### virtio-wl
+
+Proxies Wayland messages from the guest to a wayland compositor running on the host. Also
+allocates and shares memory and DMA-Buf allocations into the guest.
+
+