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# QEMU-related utilities shared between various Nix expressions.
{ lib, pkgs }:
let
zeroPad = n:
lib.optionalString (n < 16) "0" +
(if n > 255
then throw "Can't have more than 255 nets or nodes!"
else lib.toHexString n);
in
rec {
qemuNicMac = net: machine: "52:54:00:12:${zeroPad net}:${zeroPad machine}";
qemuNICFlags = nic: net: machine:
[
"-device virtio-net-pci,netdev=vlan${toString nic},mac=${qemuNicMac net machine}"
''-netdev vde,id=vlan${toString nic},sock="$QEMU_VDE_SOCKET_${toString net}"''
];
qemuSerialDevice =
if with pkgs.stdenv.hostPlatform; isx86 || isLoongArch64 || isMips64 || isRiscV then "ttyS0"
else if (with pkgs.stdenv.hostPlatform; isAarch || isPower) then "ttyAMA0"
else throw "Unknown QEMU serial device for system '${pkgs.stdenv.hostPlatform.system}'";
qemuBinary = qemuPkg:
let
hostStdenv = qemuPkg.stdenv;
hostSystem = hostStdenv.system;
guestSystem = pkgs.stdenv.hostPlatform.system;
linuxHostGuestMatrix = {
x86_64-linux = "${qemuPkg}/bin/qemu-kvm -cpu max";
armv7l-linux = "${qemuPkg}/bin/qemu-system-arm -machine virt,accel=kvm:tcg -cpu max";
aarch64-linux = "${qemuPkg}/bin/qemu-system-aarch64 -machine virt,gic-version=max,accel=kvm:tcg -cpu max";
powerpc64le-linux = "${qemuPkg}/bin/qemu-system-ppc64 -machine powernv";
powerpc64-linux = "${qemuPkg}/bin/qemu-system-ppc64 -machine powernv";
x86_64-darwin = "${qemuPkg}/bin/qemu-kvm -cpu max";
};
otherHostGuestMatrix = {
aarch64-darwin = {
aarch64-linux = "${qemuPkg}/bin/qemu-system-aarch64 -machine virt,gic-version=2,accel=hvf:tcg -cpu max";
inherit (otherHostGuestMatrix.x86_64-darwin) x86_64-linux;
};
x86_64-darwin = {
x86_64-linux = "${qemuPkg}/bin/qemu-system-x86_64 -machine type=q35,accel=hvf:tcg -cpu max";
};
};
throwUnsupportedHostSystem =
let
supportedSystems = [ "linux" ] ++ (lib.attrNames otherHostGuestMatrix);
in
throw "Unsupported host system ${hostSystem}, supported: ${lib.concatStringsSep ", " supportedSystems}";
throwUnsupportedGuestSystem = guestMap:
throw "Unsupported guest system ${guestSystem} for host ${hostSystem}, supported: ${lib.concatStringsSep ", " (lib.attrNames guestMap)}";
in
if hostStdenv.isLinux then
linuxHostGuestMatrix.${guestSystem} or "${qemuPkg}/bin/qemu-kvm"
else
let
guestMap = (otherHostGuestMatrix.${hostSystem} or throwUnsupportedHostSystem);
in
(guestMap.${guestSystem} or (throwUnsupportedGuestSystem guestMap));
}
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