Update KVM methodology

Change-Id: I8be9b9295b691a1ec4b810e3a1255ad1bc6947ab
Signed-off-by: Peter Mikus <pmikus@cisco.com>

1 files changed, 64 insertions, 14 deletions

diff --git a/docs/report/introduction/methodology_kvm_vms_vhost_user.rst b/docs/report/introduction/methodology_kvm_vms_vhost_user.rst
index 299f708827..76a6baa8e6 100644
--- a/docs/report/introduction/methodology_kvm_vms_vhost_user.rst
+++ b/docs/report/introduction/methodology_kvm_vms_vhost_user.rst
@@ -1,20 +1,10 @@
 KVM VMs vhost-user
 ------------------
 
-QEMU is used for VPP-VM testing enviroment. By default, standard QEMU version
-preinstalled from OS repositories is used on VIRL/vpp_device functional testing
-(qemu-2.11.x for Ubuntu 18.04, qemu-2.5.0 for Ubuntu 16.04).
-In CSIT setup DUTs have small VM image `/var/lib/vm/vhost-nested.img`. QEMU
-binary can be adjusted in global settings. VM image must have installed at least
-qemu-guest-agent, sshd, bridge-utils, VirtIO support and Testpmd/L3fwd
-application. Username/password for the VM must be cisco/cisco and
-NOPASSWD sudo access. The interface naming is based on driver (management
-interface type is Intel E1000), all E1000 interfaces will be named mgmt<n> and
-all VirtIO interfaces will be named virtio<n>. In VM
-"/etc/init.d/qemu-guest-agent" you must set "TRANSPORT=isa-serial:/dev/ttyS1"
-because ttyS0 is used by serial console and ttyS1 is dedicated for
-qemu-guest-agent in QEMU setup. There is python library for QEMU setup, start
-and some utilities "resources/libraries/python/QemuUtils.py"
+QEMU is used for vhost testing enviroment. By default, standard QEMU version
+preinstalled from OS repositories is used (qemu-2.11.1 for Ubuntu 18.04,
+qemu-2.5.0 for Ubuntu 16.04) and the path to the QEMU binary can be adjusted
+in `Constants.py`.
 
 FD.io CSIT performance lab is testing VPP vhost with KVM VMs using
 following environment settings:
@@ -35,3 +25,63 @@ following environment settings:
   throughput) and same test measurements repeatability, by making VPP
   and VM data plane threads less susceptible to other Linux OS system
   tasks hijacking CPU cores running those data plane threads.
+
+CSIT does support two types VM definitions: Image or Kernel.
+
+Image VM
+~~~~~~~~
+
+CSIT can use a pre-created VM image. The path to image can be adjusted in
+`Constants.py`. For convenience and full compatibility CSIT repository contains
+a set of scripts to prepare `Built-root <https://buildroot.org/>`_ based
+embedded Linux image with all the dependencies needed to run DPDK testpmd, DPDK
+l3fwd, Linux bridge or Linux IPv4 forwarding.
+
+Built-root was chosen for a VM image to be lightweight and booting time
+should not impact tests duration.
+
+VM image must have installed at least qemu-guest-agent, sshd, bridge-utils,
+VirtIO support and DPDK Testpmd/L3fwd application. Username/password for the VM
+must be cisco/cisco and NOPASSWD sudo access. The interface naming is based on
+driver (management interface type is Intel E1000), all E1000 interfaces will be
+named mgmt<n> and all VirtIO interfaces will be named virtio<n>. In VM
+"/etc/init.d/qemu-guest-agent" must be set to "TRANSPORT=isa-serial:/dev/ttyS1"
+because ttyS0 is used by serial console and ttyS1 is dedicated for
+qemu-guest-agent in QEMU setup.
+
+Kernel VM
+~~~~~~~~~
+
+As an alternative to image VM, CSIT can use a kernel KVM image as a boot kernel.
+This option allows better configurability of what application is running in VM
+userspace. As a filesystem root9p is used which allows to map the host OS
+filesystem as read only guest OS filesystem.
+
+Example of custom init script for the kernel VM:
+
+::
+  #!/bin/bash
+  mount -t sysfs -o "nodev,noexec,nosuid" sysfs /sys
+  mount -t proc -o "nodev,noexec,nosuid" proc /proc
+  mkdir /dev/pts
+  mkdir /dev/hugepages
+  mount -t devpts -o "rw,noexec,nosuid,gid=5,mode=0620" devpts /dev/pts || true
+  mount -t tmpfs -o "rw,noexec,nosuid,size=10%,mode=0755" tmpfs /run
+  mount -t tmpfs -o "rw,noexec,nosuid,size=10%,mode=0755" tmpfs /tmp
+  mount -t hugetlbfs -o "rw,relatime,pagesize=2M" hugetlbfs /dev/hugepages
+  echo 0000:00:06.0 > /sys/bus/pci/devices/0000:00:06.0/driver/unbind
+  echo 0000:00:07.0 > /sys/bus/pci/devices/0000:00:07.0/driver/unbind
+  echo uio_pci_generic > /sys/bus/pci/devices/0000:00:06.0/driver_override
+  echo uio_pci_generic > /sys/bus/pci/devices/0000:00:07.0/driver_override
+  echo 0000:00:06.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
+  echo 0000:00:07.0 > /sys/bus/pci/drivers/uio_pci_generic/bind
+  $vnf_bin
+  poweroff -f
+
+The `$vnf_bin` variable is replaced, during runtime by the QemuUtils libraries,
+by the path to NF binary and its parameters. This allows CSIT to run the
+applications installed on host OS, for example VPP of the same version as
+running on host OS.
+
+Kernel KVM image must be available on host filesystem as a prerequisite.
+The path to kernel image is defined in `Constants.py`.
\ No newline at end of file