Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

6 files changed, 1290 insertions, 0 deletions

diff --git a/docs/config/ich9-ehci-uhci.cfg b/docs/config/ich9-ehci-uhci.cfg
new file mode 100644
index 000000000..a0e9b96f4
--- /dev/null
+++ b/docs/config/ich9-ehci-uhci.cfg
@@ -0,0 +1,37 @@
+###########################################################################
+#
+# You can pass this file directly to qemu using the -readconfig
+# command line switch.
+#
+# This config file creates a EHCI adapter with companion UHCI
+# controllers as multifunction device in PCI slot "1d".
+#
+# Specify "bus=ehci.0" when creating usb devices to hook them up
+# there.
+#
+
+[device "ehci"]
+  driver = "ich9-usb-ehci1"
+  addr = "1d.7"
+  multifunction = "on"
+
+[device "uhci-1"]
+  driver = "ich9-usb-uhci1"
+  addr = "1d.0"
+  multifunction = "on"
+  masterbus = "ehci.0"
+  firstport = "0"
+
+[device "uhci-2"]
+  driver = "ich9-usb-uhci2"
+  addr = "1d.1"
+  multifunction = "on"
+  masterbus = "ehci.0"
+  firstport = "2"
+
+[device "uhci-3"]
+  driver = "ich9-usb-uhci3"
+  addr = "1d.2"
+  multifunction = "on"
+  masterbus = "ehci.0"
+  firstport = "4"
diff --git a/docs/config/mach-virt-graphical.cfg b/docs/config/mach-virt-graphical.cfg
new file mode 100644
index 000000000..d6d31b17f
--- /dev/null
+++ b/docs/config/mach-virt-graphical.cfg
@@ -0,0 +1,281 @@
+# mach-virt - VirtIO guest (graphical console)
+# =========================================================
+#
+# Usage:
+#
+#   $ qemu-system-aarch64 \
+#     -nodefaults \
+#     -readconfig mach-virt-graphical.cfg \
+#     -cpu host
+#
+# You will probably need to tweak the lines marked as
+# CHANGE ME before being able to use this configuration!
+#
+# The guest will have a selection of VirtIO devices
+# tailored towards optimal performance with modern guests,
+# and will be accessed through a graphical console.
+#
+# ---------------------------------------------------------
+#
+# Using -nodefaults is required to have full control over
+# the virtual hardware: when it's specified, QEMU will
+# populate the board with only the builtin peripherals,
+# such as the PL011 UART, plus a PCI Express Root Bus; the
+# user will then have to explicitly add further devices.
+#
+# The PCI Express Root Bus shows up in the guest as:
+#
+#   00:00.0 Host bridge
+#
+# This configuration file adds a number of other useful
+# devices, more specifically:
+#
+#   00:01.0 Display controller
+#   00.1c.* PCI bridge (PCI Express Root Ports)
+#   01:00.0 SCSI storage controller
+#   02:00.0 Ethernet controller
+#   03:00.0 USB controller
+#
+# More information about these devices is available below.
+
+
+# Machine options
+# =========================================================
+#
+# We use the virt machine type and enable KVM acceleration
+# for better performance.
+#
+# Using less than 1 GiB of memory is probably not going to
+# yield good performance in the guest, and might even lead
+# to obscure boot issues in some cases.
+#
+# Unfortunately, there is no way to configure the CPU model
+# in this file, so it will have to be provided on the
+# command line, but we can configure the guest to use the
+# same GIC version as the host.
+
+[machine]
+  type = "virt"
+  accel = "kvm"
+  gic-version = "host"
+
+[memory]
+  size = "1024"
+
+
+# Firmware configuration
+# =========================================================
+#
+# There are two parts to the firmware: a read-only image
+# containing the executable code, which is shared between
+# guests, and a read/write variable store that is owned
+# by one specific guest, exclusively, and is used to
+# record information such as the UEFI boot order.
+#
+# For any new guest, its permanent, private variable store
+# should initially be copied from the template file
+# provided along with the firmware binary.
+#
+# Depending on the OS distribution you're using on the
+# host, the name of the package containing the firmware
+# binary and variable store template, as well as the paths
+# to the files themselves, will be different. For example:
+#
+# Fedora
+#   edk2-aarch64                                      (pkg)
+#   /usr/share/edk2/aarch64/QEMU_EFI-pflash.raw       (bin)
+#   /usr/share/edk2/aarch64/vars-template-pflash.raw  (var)
+#
+# RHEL
+#   AAVMF                                             (pkg)
+#   /usr/share/AAVMF/AAVMF_CODE.fd                    (bin)
+#   /usr/share/AAVMF/AAVMF_VARS.fd                    (var)
+#
+# Debian/Ubuntu
+#   qemu-efi                                          (pkg)
+#   /usr/share/AAVMF/AAVMF_CODE.fd                    (bin)
+#   /usr/share/AAVMF/AAVMF_VARS.fd                    (var)
+
+[drive "uefi-binary"]
+  file = "/usr/share/AAVMF/AAVMF_CODE.fd"       # CHANGE ME
+  format = "raw"
+  if = "pflash"
+  unit = "0"
+  readonly = "on"
+
+[drive "uefi-varstore"]
+  file = "guest_VARS.fd"                        # CHANGE ME
+  format = "raw"
+  if = "pflash"
+  unit = "1"
+
+
+# PCI bridge (PCI Express Root Ports)
+# =========================================================
+#
+# We create eight PCI Express Root Ports, and we plug them
+# all into separate functions of the same slot. Some of
+# them will be used by devices, the rest will remain
+# available for hotplug.
+
+[device "pcie.1"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.0"
+  port = "1"
+  chassis = "1"
+  multifunction = "on"
+
+[device "pcie.2"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.1"
+  port = "2"
+  chassis = "2"
+
+[device "pcie.3"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.2"
+  port = "3"
+  chassis = "3"
+
+[device "pcie.4"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.3"
+  port = "4"
+  chassis = "4"
+
+[device "pcie.5"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.4"
+  port = "5"
+  chassis = "5"
+
+[device "pcie.6"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.5"
+  port = "6"
+  chassis = "6"
+
+[device "pcie.7"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.6"
+  port = "7"
+  chassis = "7"
+
+[device "pcie.8"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.7"
+  port = "8"
+  chassis = "8"
+
+
+# SCSI storage controller (and storage)
+# =========================================================
+#
+# We use virtio-scsi here so that we can (hot)plug a large
+# number of disks without running into issues; a SCSI disk,
+# backed by a qcow2 disk image on the host's filesystem, is
+# attached to it.
+#
+# We also create an optical disk, mostly for installation
+# purposes: once the guest OS has been successfully
+# installed, the guest will no longer boot from optical
+# media. If you don't want, or no longer want, to have an
+# optical disk in the guest you can safely comment out
+# all relevant sections below.
+
+[device "scsi"]
+  driver = "virtio-scsi-pci"
+  bus = "pcie.1"
+  addr = "00.0"
+
+[device "scsi-disk"]
+  driver = "scsi-hd"
+  bus = "scsi.0"
+  drive = "disk"
+  bootindex = "1"
+
+[drive "disk"]
+  file = "guest.qcow2"                          # CHANGE ME
+  format = "qcow2"
+  if = "none"
+
+[device "scsi-optical-disk"]
+  driver = "scsi-cd"
+  bus = "scsi.0"
+  drive = "optical-disk"
+  bootindex = "2"
+
+[drive "optical-disk"]
+  file = "install.iso"                          # CHANGE ME
+  format = "raw"
+  if = "none"
+
+
+# Ethernet controller
+# =========================================================
+#
+# We use virtio-net for improved performance over emulated
+# hardware; on the host side, we take advantage of user
+# networking so that the QEMU process doesn't require any
+# additional privileges.
+
+[netdev "hostnet"]
+  type = "user"
+
+[device "net"]
+  driver = "virtio-net-pci"
+  netdev = "hostnet"
+  bus = "pcie.2"
+  addr = "00.0"
+
+
+# USB controller (and input devices)
+# =========================================================
+#
+# We add a virtualization-friendly USB 3.0 controller and
+# a USB keyboard / USB tablet combo so that graphical
+# guests can be controlled appropriately.
+
+[device "usb"]
+  driver = "nec-usb-xhci"
+  bus = "pcie.3"
+  addr = "00.0"
+
+[device "keyboard"]
+  driver = "usb-kbd"
+  bus = "usb.0"
+
+[device "tablet"]
+  driver = "usb-tablet"
+  bus = "usb.0"
+
+
+# Display controller
+# =========================================================
+#
+# We use virtio-gpu because the legacy VGA framebuffer is
+# very troublesome on aarch64, and virtio-gpu is the only
+# video device that doesn't implement it.
+#
+# If you're running the guest on a remote, potentially
+# headless host, you will probably want to append something
+# like
+#
+#   -display vnc=127.0.0.1:0
+#
+# to the command line in order to prevent QEMU from
+# creating a graphical display window on the host and
+# enable remote access instead.
+
+[device "video"]
+  driver = "virtio-gpu"
+  bus = "pcie.0"
+  addr = "01.0"
diff --git a/docs/config/mach-virt-serial.cfg b/docs/config/mach-virt-serial.cfg
new file mode 100644
index 000000000..18a7c8373
--- /dev/null
+++ b/docs/config/mach-virt-serial.cfg
@@ -0,0 +1,243 @@
+# mach-virt - VirtIO guest (serial console)
+# =========================================================
+#
+# Usage:
+#
+#   $ qemu-system-aarch64 \
+#     -nodefaults \
+#     -readconfig mach-virt-serial.cfg \
+#     -display none -serial mon:stdio \
+#     -cpu host
+#
+# You will probably need to tweak the lines marked as
+# CHANGE ME before being able to use this configuration!
+#
+# The guest will have a selection of VirtIO devices
+# tailored towards optimal performance with modern guests,
+# and will be accessed through the serial console.
+#
+# ---------------------------------------------------------
+#
+# Using -nodefaults is required to have full control over
+# the virtual hardware: when it's specified, QEMU will
+# populate the board with only the builtin peripherals,
+# such as the PL011 UART, plus a PCI Express Root Bus; the
+# user will then have to explicitly add further devices.
+#
+# The PCI Express Root Bus shows up in the guest as:
+#
+#   00:00.0 Host bridge
+#
+# This configuration file adds a number of other useful
+# devices, more specifically:
+#
+#   00.1c.* PCI bridge (PCI Express Root Ports)
+#   01:00.0 SCSI storage controller
+#   02:00.0 Ethernet controller
+#
+# More information about these devices is available below.
+#
+# We use '-display none' to prevent QEMU from creating a
+# graphical display window, which would serve no use in
+# this specific configuration, and '-serial mon:stdio' to
+# multiplex the guest's serial console and the QEMU monitor
+# to the host's stdio; use 'Ctrl+A h' to learn how to
+# switch between the two and more.
+
+
+# Machine options
+# =========================================================
+#
+# We use the virt machine type and enable KVM acceleration
+# for better performance.
+#
+# Using less than 1 GiB of memory is probably not going to
+# yield good performance in the guest, and might even lead
+# to obscure boot issues in some cases.
+#
+# Unfortunately, there is no way to configure the CPU model
+# in this file, so it will have to be provided on the
+# command line, but we can configure the guest to use the
+# same GIC version as the host.
+
+[machine]
+  type = "virt"
+  accel = "kvm"
+  gic-version = "host"
+
+[memory]
+  size = "1024"
+
+
+# Firmware configuration
+# =========================================================
+#
+# There are two parts to the firmware: a read-only image
+# containing the executable code, which is shared between
+# guests, and a read/write variable store that is owned
+# by one specific guest, exclusively, and is used to
+# record information such as the UEFI boot order.
+#
+# For any new guest, its permanent, private variable store
+# should initially be copied from the template file
+# provided along with the firmware binary.
+#
+# Depending on the OS distribution you're using on the
+# host, the name of the package containing the firmware
+# binary and variable store template, as well as the paths
+# to the files themselves, will be different. For example:
+#
+# Fedora
+#   edk2-aarch64                                      (pkg)
+#   /usr/share/edk2/aarch64/QEMU_EFI-pflash.raw       (bin)
+#   /usr/share/edk2/aarch64/vars-template-pflash.raw  (var)
+#
+# RHEL
+#   AAVMF                                             (pkg)
+#   /usr/share/AAVMF/AAVMF_CODE.fd                    (bin)
+#   /usr/share/AAVMF/AAVMF_VARS.fd                    (var)
+#
+# Debian/Ubuntu
+#   qemu-efi                                          (pkg)
+#   /usr/share/AAVMF/AAVMF_CODE.fd                    (bin)
+#   /usr/share/AAVMF/AAVMF_VARS.fd                    (var)
+
+[drive "uefi-binary"]
+  file = "/usr/share/AAVMF/AAVMF_CODE.fd"       # CHANGE ME
+  format = "raw"
+  if = "pflash"
+  unit = "0"
+  readonly = "on"
+
+[drive "uefi-varstore"]
+  file = "guest_VARS.fd"                        # CHANGE ME
+  format = "raw"
+  if = "pflash"
+  unit = "1"
+
+
+# PCI bridge (PCI Express Root Ports)
+# =========================================================
+#
+# We create eight PCI Express Root Ports, and we plug them
+# all into separate functions of the same slot. Some of
+# them will be used by devices, the rest will remain
+# available for hotplug.
+
+[device "pcie.1"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.0"
+  port = "1"
+  chassis = "1"
+  multifunction = "on"
+
+[device "pcie.2"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.1"
+  port = "2"
+  chassis = "2"
+
+[device "pcie.3"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.2"
+  port = "3"
+  chassis = "3"
+
+[device "pcie.4"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.3"
+  port = "4"
+  chassis = "4"
+
+[device "pcie.5"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.4"
+  port = "5"
+  chassis = "5"
+
+[device "pcie.6"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.5"
+  port = "6"
+  chassis = "6"
+
+[device "pcie.7"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.6"
+  port = "7"
+  chassis = "7"
+
+[device "pcie.8"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.7"
+  port = "8"
+  chassis = "8"
+
+
+# SCSI storage controller (and storage)
+# =========================================================
+#
+# We use virtio-scsi here so that we can (hot)plug a large
+# number of disks without running into issues; a SCSI disk,
+# backed by a qcow2 disk image on the host's filesystem, is
+# attached to it.
+#
+# We also create an optical disk, mostly for installation
+# purposes: once the guest OS has been successfully
+# installed, the guest will no longer boot from optical
+# media. If you don't want, or no longer want, to have an
+# optical disk in the guest you can safely comment out
+# all relevant sections below.
+
+[device "scsi"]
+  driver = "virtio-scsi-pci"
+  bus = "pcie.1"
+  addr = "00.0"
+
+[device "scsi-disk"]
+  driver = "scsi-hd"
+  bus = "scsi.0"
+  drive = "disk"
+  bootindex = "1"
+
+[drive "disk"]
+  file = "guest.qcow2"                          # CHANGE ME
+  format = "qcow2"
+  if = "none"
+
+[device "scsi-optical-disk"]
+  driver = "scsi-cd"
+  bus = "scsi.0"
+  drive = "optical-disk"
+  bootindex = "2"
+
+[drive "optical-disk"]
+  file = "install.iso"                          # CHANGE ME
+  format = "raw"
+  if = "none"
+
+
+# Ethernet controller
+# =========================================================
+#
+# We use virtio-net for improved performance over emulated
+# hardware; on the host side, we take advantage of user
+# networking so that the QEMU process doesn't require any
+# additional privileges.
+
+[netdev "hostnet"]
+  type = "user"
+
+[device "net"]
+  driver = "virtio-net-pci"
+  netdev = "hostnet"
+  bus = "pcie.2"
+  addr = "00.0"
diff --git a/docs/config/q35-emulated.cfg b/docs/config/q35-emulated.cfg
new file mode 100644
index 000000000..99ac918e7
--- /dev/null
+++ b/docs/config/q35-emulated.cfg
@@ -0,0 +1,288 @@
+# q35 - Emulated guest (graphical console)
+# =========================================================
+#
+# Usage:
+#
+#   $ qemu-system-x86_64 \
+#     -nodefaults \
+#     -readconfig q35-emulated.cfg
+#
+# You will probably need to tweak the lines marked as
+# CHANGE ME before being able to use this configuration!
+#
+# The guest will have a selection of emulated devices that
+# closely resembles that of a physical machine, and will be
+# accessed through a graphical console.
+#
+# ---------------------------------------------------------
+#
+# Using -nodefaults is required to have full control over
+# the virtual hardware: when it's specified, QEMU will
+# populate the board with only the builtin peripherals
+# plus a small selection of core PCI devices and
+# controllers; the user will then have to explicitly add
+# further devices.
+#
+# The core PCI devices show up in the guest as:
+#
+#   00:00.0 Host bridge
+#   00:1f.0 ISA bridge / LPC
+#   00:1f.2 SATA (AHCI) controller
+#   00:1f.3 SMBus controller
+#
+# This configuration file adds a number of devices that
+# are pretty much guaranteed to be present in every single
+# physical machine based on q35, more specifically:
+#
+#   00:01.0 VGA compatible controller
+#   00:19.0 Ethernet controller
+#   00:1a.* USB controller (#2)
+#   00:1b.0 Audio device
+#   00:1c.* PCI bridge (PCI Express Root Ports)
+#   00:1d.* USB Controller (#1)
+#   00:1e.0 PCI bridge (legacy PCI bridge)
+#
+# More information about these devices is available below.
+
+
+# Machine options
+# =========================================================
+#
+# We use the q35 machine type and enable KVM acceleration
+# for better performance.
+#
+# Using less than 1 GiB of memory is probably not going to
+# yield good performance in the guest, and might even lead
+# to obscure boot issues in some cases.
+#
+# Unfortunately, there is no way to configure the CPU model
+# in this file, so it will have to be provided on the
+# command line.
+
+[machine]
+  type = "q35"
+  accel = "kvm"
+
+[memory]
+  size = "1024"
+
+
+# PCI bridge (PCI Express Root Ports)
+# =========================================================
+#
+# We add four PCI Express Root Ports, all sharing the same
+# slot on the PCI Express  Root Bus. These ports support
+# hotplug.
+
+[device "ich9-pcie-port-1"]
+  driver = "ioh3420"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1c.0"
+  port = "1"
+  chassis = "1"
+
+[device "ich9-pcie-port-2"]
+  driver = "ioh3420"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1c.1"
+  port = "2"
+  chassis = "2"
+
+[device "ich9-pcie-port-3"]
+  driver = "ioh3420"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1c.2"
+  port = "3"
+  chassis = "3"
+
+[device "ich9-pcie-port-4"]
+  driver = "ioh3420"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1c.3"
+  port = "4"
+  chassis = "4"
+
+
+# PCI bridge (legacy PCI bridge)
+# =========================================================
+#
+# This bridge can be used to build an independent topology
+# for legacy PCI devices. PCI Express devices should be
+# plugged into PCI Express slots instead, so ideally there
+# will be no devices connected to this bridge.
+
+[device "ich9-pci-bridge"]
+  driver = "i82801b11-bridge"
+  bus = "pcie.0"
+  addr = "1e.0"
+
+
+# SATA storage
+# =========================================================
+#
+# An implicit SATA controller is created automatically for
+# every single q35 guest; here we create a disk, backed by
+# a qcow2 disk image on the host's filesystem, and attach
+# it to that controller so that the guest can use it.
+#
+# We also create an optical disk, mostly for installation
+# purposes: once the guest OS has been successfully
+# installed, the guest will no longer boot from optical
+# media. If you don't want, or no longer want, to have an
+# optical disk in the guest you can safely comment out
+# all relevant sections below.
+
+[device "sata-disk"]
+  driver = "ide-hd"
+  bus = "ide.0"
+  drive = "disk"
+  bootindex = "1"
+
+[drive "disk"]
+  file = "guest.qcow2"                          # CHANGE ME
+  format = "qcow2"
+  if = "none"
+
+[device "sata-optical-disk"]
+  driver = "ide-cd"
+  bus = "ide.1"
+  drive = "optical-disk"
+  bootindex = "2"
+
+[drive "optical-disk"]
+  file = "install.iso"                          # CHANGE ME
+  format = "raw"
+  if = "none"
+
+
+# USB controller (#1)
+# =========================================================
+#
+# EHCI controller + UHCI companion controllers.
+
+[device "ich9-ehci-1"]
+  driver = "ich9-usb-ehci1"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1d.7"
+
+[device "ich9-uhci-1"]
+  driver = "ich9-usb-uhci1"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1d.0"
+  masterbus = "ich9-ehci-1.0"
+  firstport = "0"
+
+[device "ich9-uhci-2"]
+  driver = "ich9-usb-uhci2"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1d.1"
+  masterbus = "ich9-ehci-1.0"
+  firstport = "2"
+
+[device "ich9-uhci-3"]
+  driver = "ich9-usb-uhci3"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1d.2"
+  masterbus = "ich9-ehci-1.0"
+  firstport = "4"
+
+
+# USB controller (#2)
+# =========================================================
+#
+# EHCI controller + UHCI companion controllers.
+
+[device "ich9-ehci-2"]
+  driver = "ich9-usb-ehci2"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1a.7"
+
+[device "ich9-uhci-4"]
+  driver = "ich9-usb-uhci4"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1a.0"
+  masterbus = "ich9-ehci-2.0"
+  firstport = "0"
+
+[device "ich9-uhci-5"]
+  driver = "ich9-usb-uhci5"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1a.1"
+  masterbus = "ich9-ehci-2.0"
+  firstport = "2"
+
+[device "ich9-uhci-6"]
+  driver = "ich9-usb-uhci6"
+  multifunction = "on"
+  bus = "pcie.0"
+  addr = "1a.2"
+  masterbus = "ich9-ehci-2.0"
+  firstport = "4"
+
+
+# Ethernet controller
+# =========================================================
+#
+# We add a Gigabit Ethernet interface to the guest; on the
+# host side, we take advantage of user networking so that
+# the QEMU process doesn't require any additional
+# privileges.
+
+[netdev "hostnet"]
+  type = "user"
+
+[device "net"]
+  driver = "e1000"
+  netdev = "hostnet"
+  bus = "pcie.0"
+  addr = "19.0"
+
+
+# VGA compatible controller
+# =========================================================
+#
+# We use stdvga instead of Cirrus as it supports more video
+# modes and is closer to what actual hardware looks like.
+#
+# If you're running the guest on a remote, potentially
+# headless host, you will probably want to append something
+# like
+#
+#   -display vnc=127.0.0.1:0
+#
+# to the command line in order to prevent QEMU from
+# creating a graphical display window on the host and
+# enable remote access instead.
+
+[device "video"]
+  driver = "VGA"
+  bus = "pcie.0"
+  addr = "01.0"
+
+
+# Audio device
+# =========================================================
+#
+# The sound card is a legacy PCI device that is plugged
+# directly into the PCI Express Root Bus.
+
+[device "ich9-hda-audio"]
+  driver = "ich9-intel-hda"
+  bus = "pcie.0"
+  addr = "1b.0"
+
+[device "ich9-hda-duplex"]
+  driver = "hda-duplex"
+  bus = "ich9-hda-audio.0"
+  cad = "0"
diff --git a/docs/config/q35-virtio-graphical.cfg b/docs/config/q35-virtio-graphical.cfg
new file mode 100644
index 000000000..4207f11e4
--- /dev/null
+++ b/docs/config/q35-virtio-graphical.cfg
@@ -0,0 +1,248 @@
+# q35 - VirtIO guest (graphical console)
+# =========================================================
+#
+# Usage:
+#
+#   $ qemu-system-x86_64 \
+#     -nodefaults \
+#     -readconfig q35-virtio-graphical.cfg
+#
+# You will probably need to tweak the lines marked as
+# CHANGE ME before being able to use this configuration!
+#
+# The guest will have a selection of VirtIO devices
+# tailored towards optimal performance with modern guests,
+# and will be accessed through a graphical console.
+#
+# ---------------------------------------------------------
+#
+# Using -nodefaults is required to have full control over
+# the virtual hardware: when it's specified, QEMU will
+# populate the board with only the builtin peripherals
+# plus a small selection of core PCI devices and
+# controllers; the user will then have to explicitly add
+# further devices.
+#
+# The core PCI devices show up in the guest as:
+#
+#   00:00.0 Host bridge
+#   00:1f.0 ISA bridge / LPC
+#   00:1f.2 SATA (AHCI) controller
+#   00:1f.3 SMBus controller
+#
+# This configuration file adds a number of other useful
+# devices, more specifically:
+#
+#   00:01.0 VGA compatible controller
+#   00:1b.0 Audio device
+#   00.1c.* PCI bridge (PCI Express Root Ports)
+#   01:00.0 SCSI storage controller
+#   02:00.0 Ethernet controller
+#   03:00.0 USB controller
+#
+# More information about these devices is available below.
+
+
+# Machine options
+# =========================================================
+#
+# We use the q35 machine type and enable KVM acceleration
+# for better performance.
+#
+# Using less than 1 GiB of memory is probably not going to
+# yield good performance in the guest, and might even lead
+# to obscure boot issues in some cases.
+
+[machine]
+  type = "q35"
+  accel = "kvm"
+
+[memory]
+  size = "1024"
+
+
+# PCI bridge (PCI Express Root Ports)
+# =========================================================
+#
+# We create eight PCI Express Root Ports, and we plug them
+# all into separate functions of the same slot. Some of
+# them will be used by devices, the rest will remain
+# available for hotplug.
+
+[device "pcie.1"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.0"
+  port = "1"
+  chassis = "1"
+  multifunction = "on"
+
+[device "pcie.2"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.1"
+  port = "2"
+  chassis = "2"
+
+[device "pcie.3"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.2"
+  port = "3"
+  chassis = "3"
+
+[device "pcie.4"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.3"
+  port = "4"
+  chassis = "4"
+
+[device "pcie.5"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.4"
+  port = "5"
+  chassis = "5"
+
+[device "pcie.6"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.5"
+  port = "6"
+  chassis = "6"
+
+[device "pcie.7"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.6"
+  port = "7"
+  chassis = "7"
+
+[device "pcie.8"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.7"
+  port = "8"
+  chassis = "8"
+
+
+# SCSI storage controller (and storage)
+# =========================================================
+#
+# We use virtio-scsi here so that we can (hot)plug a large
+# number of disks without running into issues; a SCSI disk,
+# backed by a qcow2 disk image on the host's filesystem, is
+# attached to it.
+#
+# We also create an optical disk, mostly for installation
+# purposes: once the guest OS has been successfully
+# installed, the guest will no longer boot from optical
+# media. If you don't want, or no longer want, to have an
+# optical disk in the guest you can safely comment out
+# all relevant sections below.
+
+[device "scsi"]
+  driver = "virtio-scsi-pci"
+  bus = "pcie.1"
+  addr = "00.0"
+
+[device "scsi-disk"]
+  driver = "scsi-hd"
+  bus = "scsi.0"
+  drive = "disk"
+  bootindex = "1"
+
+[drive "disk"]
+  file = "guest.qcow2"                          # CHANGE ME
+  format = "qcow2"
+  if = "none"
+
+[device "scsi-optical-disk"]
+  driver = "scsi-cd"
+  bus = "scsi.0"
+  drive = "optical-disk"
+  bootindex = "2"
+
+[drive "optical-disk"]
+  file = "install.iso"                          # CHANGE ME
+  format = "raw"
+  if = "none"
+
+
+# Ethernet controller
+# =========================================================
+#
+# We use virtio-net for improved performance over emulated
+# hardware; on the host side, we take advantage of user
+# networking so that the QEMU process doesn't require any
+# additional privileges.
+
+[netdev "hostnet"]
+  type = "user"
+
+[device "net"]
+  driver = "virtio-net-pci"
+  netdev = "hostnet"
+  bus = "pcie.2"
+  addr = "00.0"
+
+
+# USB controller (and input devices)
+# =========================================================
+#
+# We add a virtualization-friendly USB 3.0 controller and
+# a USB tablet so that graphical guests can be controlled
+# appropriately. A USB keyboard is not needed, as q35
+# guests get a PS/2 one added automatically.
+
+[device "usb"]
+  driver = "nec-usb-xhci"
+  bus = "pcie.3"
+  addr = "00.0"
+
+[device "tablet"]
+  driver = "usb-tablet"
+  bus = "usb.0"
+
+
+# VGA compatible controller
+# =========================================================
+#
+# We plug the QXL video card directly into the PCI Express
+# Root Bus as it is a legacy PCI device; this way, we can
+# reduce the number of PCI Express controllers in the
+# guest.
+#
+# If you're running the guest on a remote, potentially
+# headless host, you will probably want to append something
+# like
+#
+#   -display vnc=127.0.0.1:0
+#
+# to the command line in order to prevent QEMU from
+# creating a graphical display window on the host and
+# enable remote access instead.
+
+[device "video"]
+  driver = "qxl-vga"
+  bus = "pcie.0"
+  addr = "01.0"
+
+
+# Audio device
+# =========================================================
+#
+# Like the video card, the sound card is a legacy PCI
+# device and as such can be plugged directly into the PCI
+# Express Root Bus.
+
+[device "sound"]
+  driver = "ich9-intel-hda"
+  bus = "pcie.0"
+  addr = "1b.0"
+
+[device "duplex"]
+  driver = "hda-duplex"
+  bus = "sound.0"
+  cad = "0"
diff --git a/docs/config/q35-virtio-serial.cfg b/docs/config/q35-virtio-serial.cfg
new file mode 100644
index 000000000..d2830aec5
--- /dev/null
+++ b/docs/config/q35-virtio-serial.cfg
@@ -0,0 +1,193 @@
+# q35 - VirtIO guest (serial console)
+# =========================================================
+#
+# Usage:
+#
+#   $ qemu-system-x86_64 \
+#     -nodefaults \
+#     -readconfig q35-virtio-serial.cfg \
+#     -display none -serial mon:stdio
+#
+# You will probably need to tweak the lines marked as
+# CHANGE ME before being able to use this configuration!
+#
+# The guest will have a selection of VirtIO devices
+# tailored towards optimal performance with modern guests,
+# and will be accessed through the serial console.
+#
+# ---------------------------------------------------------
+#
+# Using -nodefaults is required to have full control over
+# the virtual hardware: when it's specified, QEMU will
+# populate the board with only the builtin peripherals
+# plus a small selection of core PCI devices and
+# controllers; the user will then have to explicitly add
+# further devices.
+#
+# The core PCI devices show up in the guest as:
+#
+#   00:00.0 Host bridge
+#   00:1f.0 ISA bridge / LPC
+#   00:1f.2 SATA (AHCI) controller
+#   00:1f.3 SMBus controller
+#
+# This configuration file adds a number of other useful
+# devices, more specifically:
+#
+#   00.1c.* PCI bridge (PCI Express Root Ports)
+#   01:00.0 SCSI storage controller
+#   02:00.0 Ethernet controller
+#
+# More information about these devices is available below.
+#
+# We use '-display none' to prevent QEMU from creating a
+# graphical display window, which would serve no use in
+# this specific configuration, and '-serial mon:stdio' to
+# multiplex the guest's serial console and the QEMU monitor
+# to the host's stdio; use 'Ctrl+A h' to learn how to
+# switch between the two and more.
+
+
+# Machine options
+# =========================================================
+#
+# We use the q35 machine type and enable KVM acceleration
+# for better performance.
+#
+# Using less than 1 GiB of memory is probably not going to
+# yield good performance in the guest, and might even lead
+# to obscure boot issues in some cases.
+
+[machine]
+  type = "q35"
+  accel = "kvm"
+
+[memory]
+  size = "1024"
+
+
+# PCI bridge (PCI Express Root Ports)
+# =========================================================
+#
+# We create eight PCI Express Root Ports, and we plug them
+# all into separate functions of the same slot. Some of
+# them will be used by devices, the rest will remain
+# available for hotplug.
+
+[device "pcie.1"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.0"
+  port = "1"
+  chassis = "1"
+  multifunction = "on"
+
+[device "pcie.2"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.1"
+  port = "2"
+  chassis = "2"
+
+[device "pcie.3"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.2"
+  port = "3"
+  chassis = "3"
+
+[device "pcie.4"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.3"
+  port = "4"
+  chassis = "4"
+
+[device "pcie.5"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.4"
+  port = "5"
+  chassis = "5"
+
+[device "pcie.6"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.5"
+  port = "6"
+  chassis = "6"
+
+[device "pcie.7"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.6"
+  port = "7"
+  chassis = "7"
+
+[device "pcie.8"]
+  driver = "pcie-root-port"
+  bus = "pcie.0"
+  addr = "1c.7"
+  port = "8"
+  chassis = "8"
+
+
+# SCSI storage controller (and storage)
+# =========================================================
+#
+# We use virtio-scsi here so that we can (hot)plug a large
+# number of disks without running into issues; a SCSI disk,
+# backed by a qcow2 disk image on the host's filesystem, is
+# attached to it.
+#
+# We also create an optical disk, mostly for installation
+# purposes: once the guest OS has been successfully
+# installed, the guest will no longer boot from optical
+# media. If you don't want, or no longer want, to have an
+# optical disk in the guest you can safely comment out
+# all relevant sections below.
+
+[device "scsi"]
+  driver = "virtio-scsi-pci"
+  bus = "pcie.1"
+  addr = "00.0"
+
+[device "scsi-disk"]
+  driver = "scsi-hd"
+  bus = "scsi.0"
+  drive = "disk"
+  bootindex = "1"
+
+[drive "disk"]
+  file = "guest.qcow2"                          # CHANGE ME
+  format = "qcow2"
+  if = "none"
+
+[device "scsi-optical-disk"]
+  driver = "scsi-cd"
+  bus = "scsi.0"
+  drive = "optical-disk"
+  bootindex = "2"
+
+[drive "optical-disk"]
+  file = "install.iso"                          # CHANGE ME
+  format = "raw"
+  if = "none"
+
+
+# Ethernet controller
+# =========================================================
+#
+# We use virtio-net for improved performance over emulated
+# hardware; on the host side, we take advantage of user
+# networking so that the QEMU process doesn't require any
+# additional privileges.
+
+[netdev "hostnet"]
+  type = "user"
+
+[device "net"]
+  driver = "virtio-net-pci"
+  netdev = "hostnet"
+  bus = "pcie.2"
+  addr = "00.0"