134 lines
4.6 KiB
Nix
134 lines
4.6 KiB
Nix
# This module allows the test driver to connect to the virtual machine
|
|
# via a root shell attached to port 514.
|
|
|
|
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
kernel = config.boot.kernelPackages.kernel;
|
|
# FIXME: figure out a common place for this instead of copy pasting
|
|
serialDevice = if pkgs.stdenv.isi686 || pkgs.stdenv.isx86_64 then "ttyS0"
|
|
else if pkgs.stdenv.isArm || pkgs.stdenv.isAarch64 then "ttyAMA0"
|
|
else throw "Unknown QEMU serial device for system '${pkgs.stdenv.system}'";
|
|
in
|
|
|
|
{
|
|
|
|
# This option is a dummy that if used in conjunction with
|
|
# modules/virtualisation/qemu-vm.nix gets merged with the same option defined
|
|
# there and only is declared here because some modules use
|
|
# test-instrumentation.nix but not qemu-vm.nix.
|
|
#
|
|
# One particular example are the boot tests where we want instrumentation
|
|
# within the images but not other stuff like setting up 9p filesystems.
|
|
options.virtualisation.qemu.program = mkOption { type = types.path; };
|
|
|
|
config = {
|
|
|
|
systemd.services.backdoor =
|
|
{ wantedBy = [ "multi-user.target" ];
|
|
requires = [ "dev-hvc0.device" "dev-${serialDevice}.device" ];
|
|
after = [ "dev-hvc0.device" "dev-${serialDevice}.device" ];
|
|
script =
|
|
''
|
|
export USER=root
|
|
export HOME=/root
|
|
export DISPLAY=:0.0
|
|
|
|
source /etc/profile
|
|
|
|
# Don't use a pager when executing backdoor
|
|
# actions. Because we use a tty, commands like systemctl
|
|
# or nix-store get confused into thinking they're running
|
|
# interactively.
|
|
export PAGER=
|
|
|
|
cd /tmp
|
|
exec < /dev/hvc0 > /dev/hvc0
|
|
while ! exec 2> /dev/${serialDevice}; do sleep 0.1; done
|
|
echo "connecting to host..." >&2
|
|
stty -F /dev/hvc0 raw -echo # prevent nl -> cr/nl conversion
|
|
echo
|
|
PS1= exec /bin/sh
|
|
'';
|
|
serviceConfig.KillSignal = "SIGHUP";
|
|
};
|
|
|
|
# Prevent agetty from being instantiated on ${serialDevice}, since it
|
|
# interferes with the backdoor (writes to ${serialDevice} will randomly fail
|
|
# with EIO). Likewise for hvc0.
|
|
systemd.services."serial-getty@${serialDevice}".enable = false;
|
|
systemd.services."serial-getty@hvc0".enable = false;
|
|
|
|
boot.initrd.preDeviceCommands =
|
|
''
|
|
echo 600 > /proc/sys/kernel/hung_task_timeout_secs
|
|
'';
|
|
|
|
boot.initrd.postDeviceCommands =
|
|
''
|
|
# Using acpi_pm as a clock source causes the guest clock to
|
|
# slow down under high host load. This is usually a bad
|
|
# thing, but for VM tests it should provide a bit more
|
|
# determinism (e.g. if the VM runs at lower speed, then
|
|
# timeouts in the VM should also be delayed).
|
|
echo acpi_pm > /sys/devices/system/clocksource/clocksource0/current_clocksource
|
|
'';
|
|
|
|
boot.postBootCommands =
|
|
''
|
|
# Panic on out-of-memory conditions rather than letting the
|
|
# OOM killer randomly get rid of processes, since this leads
|
|
# to failures that are hard to diagnose.
|
|
echo 2 > /proc/sys/vm/panic_on_oom
|
|
|
|
# Coverage data is written into /tmp/coverage-data.
|
|
mkdir -p /tmp/xchg/coverage-data
|
|
'';
|
|
|
|
# If the kernel has been built with coverage instrumentation, make
|
|
# it available under /proc/gcov.
|
|
boot.kernelModules = [ "gcov-proc" ];
|
|
|
|
# Panic if an error occurs in stage 1 (rather than waiting for
|
|
# user intervention).
|
|
boot.kernelParams =
|
|
[ "console=${serialDevice}" "panic=1" "boot.panic_on_fail" ];
|
|
|
|
# `xwininfo' is used by the test driver to query open windows.
|
|
environment.systemPackages = [ pkgs.xorg.xwininfo ];
|
|
|
|
# Log everything to the serial console.
|
|
services.journald.extraConfig =
|
|
''
|
|
ForwardToConsole=yes
|
|
MaxLevelConsole=debug
|
|
'';
|
|
|
|
# Don't clobber the console with duplicate systemd messages.
|
|
systemd.extraConfig = "ShowStatus=no";
|
|
|
|
boot.consoleLogLevel = 7;
|
|
|
|
# Prevent tests from accessing the Internet.
|
|
networking.defaultGateway = mkOverride 150 "";
|
|
networking.nameservers = mkOverride 150 [ ];
|
|
|
|
systemd.globalEnvironment.GCOV_PREFIX = "/tmp/xchg/coverage-data";
|
|
|
|
system.requiredKernelConfig = with config.lib.kernelConfig; [
|
|
(isYes "SERIAL_8250_CONSOLE")
|
|
(isYes "SERIAL_8250")
|
|
(isEnabled "VIRTIO_CONSOLE")
|
|
];
|
|
|
|
networking.usePredictableInterfaceNames = false;
|
|
|
|
# Make it easy to log in as root when running the test interactively.
|
|
users.extraUsers.root.initialHashedPassword = mkOverride 150 "";
|
|
|
|
services.xserver.displayManager.job.logToJournal = true;
|
|
};
|
|
|
|
}
|