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nixos/kvmgt: allow multiple uuids on same mdev

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Edmund Wu 2020-05-30 11:56:45 -04:00
parent f75d62941d
commit 180d1d37b2
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GPG key ID: F44F23D596B4F71D
1 changed files with 28 additions and 24 deletions
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52
nixos/modules/virtualisation/kvmgt.nix
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@ -9,8 +9,8 @@ let
vgpuOptions = {
uuid = mkOption {
type = types.str;
description = "UUID of VGPU device. You can generate one with <package>libossp_uuid</package>.";
type = with types; listOf str;
description = "UUID(s) of VGPU device. You can generate one with <package>libossp_uuid</package>.";
};
};
@ -36,7 +36,7 @@ in {
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";
i915-GVTg_V5_8.uuid = [ "a297db4a-f4c2-11e6-90f6-d3b88d6c9525" ];
};
};
};
@ -51,31 +51,35 @@ in {
boot.kernelModules = [ "kvmgt" ];
boot.kernelParams = [ "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/${name}/create";
};
}
) cfg.vgpus;
services.udev.extraRules = ''
SUBSYSTEM=="vfio", OWNER="root", GROUP="kvm"
'';
systemd.services = mapAttrs' (name: value:
nameValuePair "kvmgt-${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;
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; [ gnidorah ];