87 lines
2.9 KiB
Nix
87 lines
2.9 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.virtualisation.kvmgt;
|
|
|
|
kernelPackages = config.boot.kernelPackages;
|
|
|
|
vgpuOptions = {
|
|
uuid = mkOption {
|
|
type = with types; listOf str;
|
|
description = "UUID(s) 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. To allow users to access the device without root add them
|
|
to the kvm group: <literal>users.extraUsers.<yourusername>.extraGroups = [ "kvm" ];</literal>
|
|
'';
|
|
# 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.kernelParams = [ "i915.enable_gvt=1" ];
|
|
|
|
services.udev.extraRules = ''
|
|
SUBSYSTEM=="vfio", OWNER="root", GROUP="kvm"
|
|
'';
|
|
|
|
systemd = let
|
|
vgpus = listToAttrs (flatten (mapAttrsToList
|
|
(mdev: opt: map (id: nameValuePair "kvmgt-${id}" { inherit mdev; uuid = id; }) opt.uuid)
|
|
cfg.vgpus));
|
|
in {
|
|
paths = mapAttrs (_: opt:
|
|
{
|
|
description = "KVMGT VGPU ${opt.uuid} path";
|
|
wantedBy = [ "multi-user.target" ];
|
|
pathConfig = {
|
|
PathExists = "/sys/bus/pci/devices/${cfg.device}/mdev_supported_types/${opt.mdev}/create";
|
|
};
|
|
}) vgpus;
|
|
|
|
services = mapAttrs (_: opt:
|
|
{
|
|
description = "KVMGT VGPU ${opt.uuid}";
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
ExecStart = "${pkgs.runtimeShell} -c 'echo ${opt.uuid} > /sys/bus/pci/devices/${cfg.device}/mdev_supported_types/${opt.mdev}/create'";
|
|
ExecStop = "${pkgs.runtimeShell} -c 'echo 1 > /sys/bus/pci/devices/${cfg.device}/${opt.uuid}/remove'";
|
|
};
|
|
}) vgpus;
|
|
};
|
|
};
|
|
|
|
meta.maintainers = with maintainers; [ ];
|
|
}
|