96 lines
2.8 KiB
Nix
96 lines
2.8 KiB
Nix
{ lib, pkgs, config, ... }:
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with lib;
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let
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cfg = config.virtualisation.vfio;
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cfg-libvirtd = config.virtualisation.libvirtd;
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boolToZeroOne = x: if x then "1" else "0";
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aclString = with lib.strings;
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concatMapStringsSep ''
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,
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'' escapeNixString cfg.deviceACL;
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in {
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options.virtualisation = {
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vfio = {
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enable = mkEnableOption "VFIO Configuration";
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IOMMUType = mkOption {
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type = types.enum [ "intel" "amd" ];
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example = "intel";
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description = "Type of the IOMMU used";
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};
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devices = mkOption {
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type = types.listOf (types.strMatching "[0-9a-f]{4}:[0-9a-f]{4}");
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default = [ ];
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example = [ "10de:1b80" "10de:10f0" ];
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description = "PCI IDs of devices to bind to vfio-pci";
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};
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disableEFIfb = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description = "Disables the usage of the EFI framebuffer on boot.";
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};
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blacklistNvidia = mkOption {
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type = types.bool;
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default = false;
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description = "Add Nvidia GPU modules to blacklist";
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};
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ignoreMSRs = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description =
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"Enables or disables kvm guest access to model-specific registers";
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};
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};
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libvirtd = {
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deviceACL = mkOption {
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type = types.listOf types.str;
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default = [ ];
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};
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clearEmulationCapabilities = mkOption {
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type = types.bool;
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default = true;
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};
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};
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};
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config = lib.mkIf cfg.enable {
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services.udev.extraRules = ''
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SUBSYSTEM=="vfio", OWNER="root", GROUP="kvm"
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'';
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boot.kernelParams = (if cfg.IOMMUType == "intel" then [
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"intel_iommu=on"
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"intel_iommu=igfx_off"
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] else [ "amd_iommu=on" ])
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++ (optional (builtins.length cfg.devices > 0)
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("vfio-pci.ids=" + builtins.concatStringsSep "," cfg.devices))
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++ (optionals cfg.applyACSpatch [
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"pcie_acs_override=downstream,multifunction"
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"pci=nomsi"
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]) ++ (optional cfg.disableEFIfb "video=efifb:off")
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++ (optionals cfg.ignoreMSRs [
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"kvm.ignore_msrs=1"
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"kvm.report_ignored_msrs=0"
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]);
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boot.kernelModules = [ "vfio_virqfd" "vfio_pci" "vfio_iommu_type1" "vfio" ];
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boot.initrd.kernelModules =
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[ "vfio_virqfd" "vfio_pci" "vfio_iommu_type1" "vfio" ];
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boot.blacklistedKernelModules =
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optionals cfg.blacklistNvidia [ "nvidia" "nouveau" ];
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users.users."qemu-libvirtd" = {
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extraGroups = optionals (!cfg-libvirtd.qemu.runAsRoot) [ "kvm" "input" ];
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};
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virtualisation.libvirtd.qemu.verbatimConfig = ''
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clear_emulation_capabilities = ${
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boolToZeroOne cfg-libvirtd.clearEmulationCapabilities
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}
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cgroup_device_acl = [
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${aclString}
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]
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'';
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};
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}
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