82 lines
2.6 KiB
Nix
82 lines
2.6 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.virtualisation.kvmgt;
|
|
|
|
kernelPackages = config.boot.kernelPackages;
|
|
|
|
vgpuOptions = {
|
|
uuid = mkOption {
|
|
type = types.str;
|
|
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.str;
|
|
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.kernelModules = [ "kvmgt" ];
|
|
|
|
boot.extraModprobeConfig = ''
|
|
options i915 enable_gvt=1
|
|
'';
|
|
|
|
systemd.paths = mapAttrs' (name: value:
|
|
nameValuePair "kvmgt-${name}" {
|
|
description = "KVMGT VGPU ${name} path";
|
|
wantedBy = [ "multi-user.target" ];
|
|
pathConfig = {
|
|
PathExists = "/sys/bus/pci/devices/${cfg.device}/mdev_supported_types/${name}/create";
|
|
};
|
|
}
|
|
) cfg.vgpus;
|
|
|
|
systemd.services = mapAttrs' (name: value:
|
|
nameValuePair "kvmgt-${name}" {
|
|
description = "KVMGT VGPU ${name}";
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
ExecStart = "${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'";
|
|
};
|
|
}
|
|
) cfg.vgpus;
|
|
};
|
|
|
|
meta.maintainers = with maintainers; [ gnidorah ];
|
|
}
|