diff options
Diffstat (limited to 'nixpkgs/nixos/modules/virtualisation/kvmgt.nix')
-rw-r--r-- | nixpkgs/nixos/modules/virtualisation/kvmgt.nix | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/virtualisation/kvmgt.nix b/nixpkgs/nixos/modules/virtualisation/kvmgt.nix new file mode 100644 index 000000000000..132815a0ad63 --- /dev/null +++ b/nixpkgs/nixos/modules/virtualisation/kvmgt.nix @@ -0,0 +1,70 @@ +{ config, lib, pkgs, ... }: + +with lib; + +let + cfg = config.virtualisation.kvmgt; + kernelPackages = config.boot.kernelPackages; + vgpuOptions = { + uuid = mkOption { + type = types.string; + description = "UUID of VGPU device. You can generate one with <package>libossp_uuid</package>."; + }; + }; +in { + options = { + virtualisation.kvmgt = { + enable = mkEnableOption '' + KVMGT (iGVT-g) VGPU support. Allows Qemu/KVM guests to share host's Intel integrated graphics card. + Currently only one graphical device can be shared + ''; + # multi GPU support is under the question + device = mkOption { + type = types.string; + default = "0000:00:02.0"; + description = "PCI ID of graphics card. You can figure it with <command>ls /sys/class/mdev_bus</command>."; + }; + vgpus = mkOption { + default = {}; + type = with types; attrsOf (submodule [ { options = vgpuOptions; } ]); + description = '' + Virtual GPUs to be used in Qemu. You can find devices via <command>ls /sys/bus/pci/devices/*/mdev_supported_types</command> + and find info about device via <command>cat /sys/bus/pci/devices/*/mdev_supported_types/i915-GVTg_V5_4/description</command> + ''; + example = { + "i915-GVTg_V5_8" = { + uuid = "a297db4a-f4c2-11e6-90f6-d3b88d6c9525"; + }; + }; + }; + }; + }; + + config = mkIf cfg.enable { + assertions = singleton { + assertion = versionAtLeast kernelPackages.kernel.version "4.16"; + message = "KVMGT is not properly supported for kernels older than 4.16"; + }; + boot.kernelParams = [ "i915.enable_gvt=1" ]; + systemd.services = mapAttrs' (name: value: + nameValuePair "kvmgt-${name}" { + description = "KVMGT VGPU ${name}"; + serviceConfig = { + Type = "forking"; + RemainAfterExit = true; + Restart = "on-failure"; + RestartSec = 5; + ExecStart = "${pkgs.runtimeShell} -c 'echo ${value.uuid} > /sys/bus/pci/devices/${cfg.device}/mdev_supported_types/${name}/create'"; + ExecStop = "${pkgs.runtimeShell} -c 'echo 1 > /sys/bus/pci/devices/${cfg.device}/${value.uuid}/remove'"; + }; + unitConfig = { + StartLimitBurst = 5; + StartLimitIntervalSec = 30; + }; + wantedBy = [ "multi-user.target" ]; + } + ) cfg.vgpus; + }; + + meta.maintainers = with maintainers; [ gnidorah ]; +} |