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{ config, lib, ... }:
with lib;
let
cfg = config.hardware.cpu.amd.sev;
defaultGroup = "sev";
in
with lib; {
options.hardware.cpu.amd.sev = {
enable = mkEnableOption "access to the AMD SEV device";
user = mkOption {
description = lib.mdDoc "Owner to assign to the SEV device.";
type = types.str;
default = "root";
};
group = mkOption {
description = lib.mdDoc "Group to assign to the SEV device.";
type = types.str;
default = defaultGroup;
};
mode = mkOption {
description = lib.mdDoc "Mode to set for the SEV device.";
type = types.str;
default = "0660";
};
};
config = mkIf cfg.enable {
assertions = [
{
assertion = hasAttr cfg.user config.users.users;
message = "Given user does not exist";
}
{
assertion = (cfg.group == defaultGroup) || (hasAttr cfg.group config.users.groups);
message = "Given group does not exist";
}
];
boot.extraModprobeConfig = ''
options kvm_amd sev=1
'';
users.groups = optionalAttrs (cfg.group == defaultGroup) {
"${cfg.group}" = {};
};
services.udev.extraRules = with cfg; ''
KERNEL=="sev", OWNER="${user}", GROUP="${group}", MODE="${mode}"
'';
};
}
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