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# QEMU-related utilities shared between various Nix expressions.
{ lib, stdenv }:
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_${toString net}"''
];
qemuSerialDevice =
if with stdenv.hostPlatform; isx86 || isLoongArch64 || isMips64 || isRiscV then
"ttyS0"
else if (with stdenv.hostPlatform; isAarch || isPower) then
"ttyAMA0"
else
throw "Unknown QEMU serial device for system '${stdenv.hostPlatform.system}'";
qemuBinary = qemuPkg: qemuBinaryWith { inherit qemuPkg; };
qemuBinaryWith =
{
qemuPkg,
forceAccel ? false,
}:
let
hostStdenv = qemuPkg.stdenv;
hostSystem = hostStdenv.system;
guestSystem = stdenv.hostPlatform.system;
accel = accelName: if forceAccel then accelName else "${accelName}:tcg";
linuxHostGuestMatrix = {
x86_64-linux = "${qemuPkg}/bin/qemu-system-x86_64 -machine accel=${accel "kvm"} -cpu max";
armv7l-linux = "${qemuPkg}/bin/qemu-system-arm -machine virt,accel=${accel "kvm"} -cpu max";
aarch64-linux = "${qemuPkg}/bin/qemu-system-aarch64 -machine virt,gic-version=max,accel=${accel "kvm"} -cpu max";
powerpc64le-linux = "${qemuPkg}/bin/qemu-system-ppc64 -machine powernv";
powerpc64-linux = "${qemuPkg}/bin/qemu-system-ppc64 -machine powernv";
riscv32-linux = "${qemuPkg}/bin/qemu-system-riscv32 -machine virt";
riscv64-linux = "${qemuPkg}/bin/qemu-system-riscv64 -machine virt";
};
otherHostGuestMatrix = {
aarch64-darwin = {
# Pin virt-11.0 to avoid gic-version=3 that works on MacOS 15+ only.
# FIXME: Revert to `virt` after minimal supported macos is 15+.
aarch64-linux = "${qemuPkg}/bin/qemu-system-aarch64 -machine virt-11.0,accel=${accel "hvf"} -cpu max";
x86_64-linux = "${qemuPkg}/bin/qemu-system-x86_64 -machine type=q35,accel=${accel "hvf"} -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: ${lib.concatStringsSep ", " (lib.attrNames guestMap)}";
in
if hostStdenv.hostPlatform.isLinux then
linuxHostGuestMatrix.${guestSystem} or "${qemuPkg}/bin/qemu-kvm"
else
let
guestMap = (otherHostGuestMatrix.${hostSystem} or throwUnsupportedHostSystem);
in
(guestMap.${guestSystem} or (throwUnsupportedGuestSystem guestMap));
}
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