nixpkgs/nixos/lib/qemu-flags.nix

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# QEMU flags shared between various Nix expressions.
{ pkgs }:
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let
zeroPad = n: if n < 10 then "0${toString n}" else toString n;
in
{
qemuNICFlags = nic: net: machine:
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[ "-device virtio-net-pci,netdev=vlan${toString nic},mac=52:54:00:12:${zeroPad net}:${zeroPad machine}"
"-netdev vde,id=vlan${toString nic},sock=$QEMU_VDE_SOCKET_${toString net}"
];
qemuSerialDevice = if pkgs.stdenv.isi686 || pkgs.stdenv.isx86_64 then "ttyS0"
else if pkgs.stdenv.isAarch32 || pkgs.stdenv.isAarch64 then "ttyAMA0"
else throw "Unknown QEMU serial device for system '${pkgs.stdenv.hostPlatform.system}'";
qemuBinary = qemuPkg: {
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x86_64-linux = "${qemuPkg}/bin/qemu-kvm -cpu kvm64";
armv7l-linux = "${qemuPkg}/bin/qemu-system-arm -enable-kvm -machine virt -cpu host";
aarch64-linux = "${qemuPkg}/bin/qemu-system-aarch64 -enable-kvm -machine virt,gic-version=host -cpu host";
x86_64-darwin = "${qemuPkg}/bin/qemu-kvm -cpu kvm64";
}.${pkgs.stdenv.hostPlatform.system} or "${qemuPkg}/bin/qemu-kvm";
}