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zack 2025-05-23 11:58:24 -04:00
parent 916f497b84
commit 7aed32eea7
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15 changed files with 210 additions and 154 deletions
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62
modules/nixos/hardware/gpu-passthru/default.nix
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@ -106,6 +106,26 @@ with lib.custom; let
# Change to powersave governor
echo powersave | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
'';
libvirtd-cfg = config.virtualisation.libvirtd;
qemuConfigFile = pkgs.writeText "qemu.conf" ''
${optionalString libvirtd-cfg.qemu.ovmf.enable ''
nvram = [
"/run/libvirt/nix-ovmf/AAVMF_CODE.fd:/run/libvirt/nix-ovmf/AAVMF_VARS.fd",
"/run/libvirt/nix-ovmf/AAVMF_CODE.ms.fd:/run/libvirt/nix-ovmf/AAVMF_VARS.ms.fd",
"/run/libvirt/nix-ovmf/OVMF_CODE.fd:/run/libvirt/nix-ovmf/OVMF_VARS.fd",
"/run/libvirt/nix-ovmf/OVMF_CODE.ms.fd:/run/libvirt/nix-ovmf/OVMF_VARS.ms.fd"
]
''}
${optionalString (!libvirtd-cfg.qemu.runAsRoot) ''
user = "qemu-libvirtd"
group = "qemu-libvirtd"
''}
${libvirtd-cfg.qemu.verbatimConfig}
'';
dirName = "libvirt";
in {
options.hardware.gpu-passthru = with types; {
enable = mkBoolOpt false "Enable support for single gpu-passthru";
@ -173,9 +193,45 @@ in {
in [env];
};
systemd.services.libvirtd-config = {
enable = lib.mkForce false;
};
systemd.services.libvirtd-config.script = lib.mkForce ''
# Copy default libvirt network config .xml files to /var/lib
# Files modified by the user will not be overwritten
for i in $(cd ${libvirtd-cfg.package}/var/lib && echo \
libvirt/qemu/networks/*.xml \
libvirt/nwfilter/*.xml );
do
# Intended behavior
# shellcheck disable=SC2174
mkdir -p "/var/lib/$(dirname "$i")" -m 755
if [ ! -e "/var/lib/$i" ]; then
cp -pd "${libvirtd-cfg.package}/var/lib/$i" "/var/lib/$i"
fi
done
# Copy generated qemu config to libvirt directory
cp -f ${qemuConfigFile} /var/lib/${dirName}/qemu.conf
# stable (not GC'able as in /nix/store) paths for using in <emulator> section of xml configs
for emulator in ${libvirtd-cfg.package}/libexec/libvirt_lxc ${libvirtd-cfg.qemu.package}/bin/qemu-kvm ${libvirtd-cfg.qemu.package}/bin/qemu-system-*; do
ln -s --force "$emulator" /run/${dirName}/nix-emulators/
done
ln -s --force ${libvirtd-cfg.qemu.package}/bin/qemu-pr-helper /run/${dirName}/nix-helpers/
${optionalString libvirtd-cfg.qemu.ovmf.enable (
let
ovmfpackage = pkgs.buildEnv {
name = "qemu-ovmf";
paths = libvirtd-cfg.qemu.ovmf.packages;
};
in ''
ln -s --force ${ovmfpackage}/FV/AAVMF_CODE{,.ms}.fd /run/${dirName}/nix-ovmf/
ln -s --force ${ovmfpackage}/FV/OVMF_CODE{,.ms}.fd /run/${dirName}/nix-ovmf/
ln -s --force ${ovmfpackage}/FV/AAVMF_VARS{,.ms}.fd /run/${dirName}/nix-ovmf/
ln -s --force ${ovmfpackage}/FV/OVMF_VARS{,.ms}.fd /run/${dirName}/nix-ovmf/
''
)}
'';
system.activationScripts.libvirt-hooks.text = ''
ln -Tfs /etc/libvirt/hooks /var/lib/libvirt/hooks