modules: Add a gaming virtualisation module

hosts/miku.nix

@@ -7,6 +7,7 @@
     ../modules/fonts.nix
     ../modules/users/alexander.nix
     ../modules/programs/zsh ../modules/programs/git ../modules/programs/mpv ../modules/programs/tmux ../modules/programs/emacs ../modules/programs/firefox ../modules/programs/gnome-terminal ../modules/programs/gnome ../modules/programs/i18n.nix ../modules/programs/gamemode ../modules/programs/nonvm
+    ../modules/virtualisation/gaming.nix
     ../modules/programs/distributed-build/builder.nix
     ../modules/programs/music
   ];
@@ -19,7 +20,10 @@
     }))
 
     # Steam overlay
-    (import ../overlays/steam.nix pkgs)
+    (import ../overlays/steam.nix {
+      pkgs = pkgs;
+      lib = lib;
+    })
 
     # Simple overrides
     (final: prev: {
@@ -64,7 +68,7 @@
       emacsPgtkGcc
       unstable.firmwareLinuxNonfree
       gajim
-      libvirt virt-manager qemu scream
+      virt-manager unstable.qemu scream
       gamemode # Custom package
       key-mapper # Custom package
       replaysorcery # Custom package
@@ -77,72 +81,6 @@
       # Prevent us from having to always type it out
       NIXOS_CONFIG = "/home/${config.system.singleUser}/Development/Personal/nixos-config/hosts/miku.nix";
     };
-
-    etc = {
-      "evdev-proxy/config.toml".source = pkgs.writeText "config.toml" ''
-        log_level = "INFO"
-
-        [[device]]
-          [device.Simple]
-            name = "EvdevProxyMouse"
-            vendor = 0x1337
-            model = 0x1337
-            class = "Mouse"
-            [[device.Simple.selector]]
-              USBIDClass = {vendor=0x046d, model=0xc531, class="Mouse"}
-            [[device.Simple.selector]]
-              USBIDClass = {vendor=0x046d, model=0xc07c, class="Mouse"}
-        [[device]]
-          [device.Simple]
-            name = "EvdevProxyTartarus"
-            vendor = 0x1337
-            model = 0x1338
-            class = "Keyboard"
-            # This is to give a deterministic /dev/input/by-id/ path to
-            # the mapped version of the Tartarus evdev node.
-            # (Useful for qemu)
-            [[device.Simple.selector]]
-              EVDEVClass = {phys="\"key-mapper\""}
-      '';
-      "libvirt/hooks/qemu".source = let
-        vfio-isolate-state = "/tmp/vfio-isolate-state";
-      in pkgs.writeScript "qemu" ''
-        #!${pkgs.stdenv.shell}
-        guest=$1
-        action=$2
-        phase=$3
-        extra=$4
-
-        if [[ "$guest" = "win10" ]]; then
-            case "$action" in
-                prepare)
-                # Only do this while in preparation
-                [[ ! "$phase" = "prepare" ]] && exit 0
-
-                sudo -u alexander systemctl --user start evdev-proxy.service
-                sudo -u alexander systemctl --user start scream.service
-                sleep 2
-
-                ${pkgs.vfio-isolate}/bin/vfio-isolate \
-                  -u ${vfio-isolate-state} \
-                 	cpu-governor performance "$GUEST_CORES" \
-                  cpuset-create --cpus "$GUEST_CORES" /guest.slice \
-                  cpuset-create --cpus C0,4 /host.slice \
-                  move-tasks / /host.slice \
-                  irq-affinity mask "$GUEST_CORES"
-                ;;
-                stopped)
-                # Only run when the VM is fully stopped
-                [[ ! "$phase" = "end" ]] && exit 0
-                sudo -u alexander systemctl --user stop evdev-proxy.service
-                sudo -u alexander systemctl --user stop scream.service
-
-                ${pkgs.vfio-isolate}/bin/vfio-isolate \
-                  restore ${vfio-isolate-state}
-            esac
-        fi
-      '';
-    };
   };
 
   networking = {
@@ -209,36 +147,9 @@
     sshd.enable = true;
   };
   
-  virtualisation.libvirtd = {
-    enable = true;
-    qemuOvmf = true;
-    #qemuRunAsRoot = false;
-    qemuPackage = pkgs.unstable.qemu;
-    qemuVerbatimConfig = ''
-      seccomp_sandbox = 0
-      cgroup_device_acl = [
-      	"/dev/null", "/dev/full", "/dev/zero", 
-      	"/dev/random", "/dev/urandom",
-      	"/dev/ptmx", "/dev/kvm", "/dev/kqemu",
-      	"/dev/rtc","/dev/hpet",
-        "/dev/input/by-id/usb-Logitech_USB_Receiver-if02-event-mouse",
-        "/dev/input/by-id/usb-Razer_Razer_Tartarus_V2-event-kbd",
-        "/dev/input/by-id/virtual-event-EvdevProxyMouse",
-        "/dev/input/by-id/virtual-event-EvdevProxyTartarus",
-        "/dev/input/by-id/usb-Razer_Razer_BlackWidow_Ultimate-event-kbd"
-      ]
-    '';
-  };
-  # NOTE: Workaround for libvirt's SYSCONFDIR being set to /var/lib
-  # (See https://github.com/NixOS/nixpkgs/issues/51152#issuecomment-899374407)
-  system.activationScripts.libvirt-hooks.text = ''
-    ln -Tfs /etc/libvirt/hooks /var/lib/libvirt/hooks
-  '';
-
   systemd = {
     services = {
       NetworkManager-wait-online.enable = false;
-      libvirtd.path = with pkgs; [ vfio-isolate systemd ];
     };
 
     user.services = {
@@ -281,15 +192,6 @@
           Restart = "always";
         };
       };
-      evdev-proxy = {
-        description = "Creates virtual device to proxy evdev devices events";
-        #wantedBy = [ "default.target" ];
-        serviceConfig = {
-          Type = "simple";
-          ExecStart = "${pkgs.evdev-proxy}/bin/evdev-proxy";
-          Restart = "always";
-        };
-      };
       # TODO: Remove once in stable or I decide to use unstable
       gamemode = {
         description = "A daemon/lib combo for Linux that allows games to request a set of optimisations be temporarily applied to the host OS.";
@@ -302,7 +204,6 @@
         ]);
         serviceConfig = {
           Type = "simple";
-          #ExecStart = "${pkgs.gamemode}/bin/gamemoded";
           ExecStart = "${config.security.wrapperDir}/gamemoded";
           Restart = "always";
         };

modules/programs/gamemode/#gamemode.ini#

@@ -0,0 +1,36 @@
+[general]
+reaper_freq=5
+desiredgov=performance
+; TODO: Maybe set this
+;defaultgov=powersave
+
+; The iGPU desired governor is used when the integrated GPU is under heavy load
+igpu_desiredgov=powersave
+igpu_power_threshold=0.3
+
+softrealtime=on;
+renice=0
+ioprio=0
+inhibit_screensaver=1
+
+[filter]
+; If "whitelist" entry has a value(s)
+; gamemode will reject anything not in the whitelist
+;whitelist=RiseOfTheTombRaide
+
+; Gamemode will always reject anything in the blacklist
+;blacklist=HalfLife3
+;    glxgears
+
+[gpu]
+
+[supervisor]
+
+[custom]
+start=systemctl --user start replaysorcery-kms
+      systemctl --user start replaysorcery
+
+end=systemctl --user stop replaysorcery-kms
+    systemctl --user stop replaysorcery
+
+script_timeout=10

modules/virtualisation/gaming.nix

@@ -0,0 +1,109 @@
+{ pkgs, ... }:
+
+{
+  environment.etc = {
+    "evdev-proxy/config.toml".source = pkgs.writeText "config.toml" ''
+        log_level = "INFO"
+
+        [[device]]
+          [device.Simple]
+            name = "EvdevProxyMouse"
+            vendor = 0x1337
+            model = 0x1337
+            class = "Mouse"
+            [[device.Simple.selector]]
+              USBIDClass = {vendor=0x046d, model=0xc531, class="Mouse"}
+            [[device.Simple.selector]]
+              USBIDClass = {vendor=0x046d, model=0xc07c, class="Mouse"}
+        [[device]]
+          [device.Simple]
+            name = "EvdevProxyTartarus"
+            vendor = 0x1337
+            model = 0x1338
+            class = "Keyboard"
+            # This is to give a deterministic /dev/input/by-id/ path to
+            # the mapped version of the Tartarus evdev node.
+            # (Useful for qemu)
+            [[device.Simple.selector]]
+              EVDEVClass = {phys="\"key-mapper\""}
+      '';
+    "libvirt/hooks/qemu".source = let
+      vfio-isolate-state = "/tmp/vfio-isolate-state";
+    in pkgs.writeScript "qemu" ''
+        #!${pkgs.stdenv.shell}
+        guest=$1
+        action=$2
+        phase=$3
+        extra=$4
+
+        if [[ "$guest" = "win10" ]]; then
+            case "$action" in
+                prepare)
+                # Only do this while in preparation
+                [[ ! "$phase" = "prepare" ]] && exit 0
+
+                sudo -u alexander systemctl --user start evdev-proxy.service
+                sudo -u alexander systemctl --user start scream.service
+                sleep 2
+
+                ${pkgs.vfio-isolate}/bin/vfio-isolate \
+                  -u ${vfio-isolate-state} \
+                 	cpu-governor performance "$GUEST_CORES" \
+                  cpuset-create --cpus "$GUEST_CORES" /guest.slice \
+                  cpuset-create --cpus C0,4 /host.slice \
+                  move-tasks / /host.slice \
+                  irq-affinity mask "$GUEST_CORES"
+                ;;
+                stopped)
+                # Only run when the VM is fully stopped
+                [[ ! "$phase" = "end" ]] && exit 0
+                sudo -u alexander systemctl --user stop evdev-proxy.service
+                sudo -u alexander systemctl --user stop scream.service
+
+                ${pkgs.vfio-isolate}/bin/vfio-isolate \
+                  restore ${vfio-isolate-state}
+            esac
+        fi
+      '';
+  };
+
+  virtualisation.libvirtd = {
+    enable = true;
+    #qemuRunAsRoot = false;
+    qemuOvmf = true;
+    qemuPackage = pkgs.unstable.qemu;
+    qemuVerbatimConfig = ''
+      seccomp_sandbox = 0
+      cgroup_device_acl = [
+      	"/dev/null", "/dev/full", "/dev/zero", 
+      	"/dev/random", "/dev/urandom",
+      	"/dev/ptmx", "/dev/kvm", "/dev/kqemu",
+      	"/dev/rtc","/dev/hpet",
+        "/dev/input/by-id/usb-Logitech_USB_Receiver-if02-event-mouse",
+        "/dev/input/by-id/usb-Razer_Razer_Tartarus_V2-event-kbd",
+        "/dev/input/by-id/virtual-event-EvdevProxyMouse",
+        "/dev/input/by-id/virtual-event-EvdevProxyTartarus",
+        "/dev/input/by-id/usb-Razer_Razer_BlackWidow_Ultimate-event-kbd"
+      ]
+    '';
+  };
+
+  # NOTE: Workaround for libvirt's SYSCONFDIR being set to /var/lib
+  # (See https://github.com/NixOS/nixpkgs/issues/51152#issuecomment-899374407)
+  system.activationScripts.libvirt-hooks.text = ''
+    ln -Tfs /etc/libvirt/hooks /var/lib/libvirt/hooks
+  '';
+
+  systemd = {
+    services.libvirtd.path = with pkgs; [ vfio-isolate systemd bash ];
+    user.services.evdev-proxy = {
+      description = "Creates virtual device to proxy evdev devices events";
+      #wantedBy = [ "default.target" ];
+      serviceConfig = {
+        Type = "simple";
+        ExecStart = "${pkgs.evdev-proxy}/bin/evdev-proxy";
+        Restart = "always";
+      };
+    };
+  };
+}

overlays/steam.nix

@@ -1,4 +1,5 @@
-pkgs: final: prev:
+{ pkgs, lib }:
+final: prev:
 
 # TODO: Replace with the commented out version below
 let
@@ -12,8 +13,8 @@ in {
   steam = steamPackages.steam-fhsenv.override {
     extraPkgs = pkgsx: with pkgsx; [ gamemode ];
   };
+}
 
-   #(final: prev:
 #let
 #  # NOTE: This is a really messy solution
 #  buildFHSUserEnvBubblewrap = prev.callPackage ../packages/build-support/build-fhs-userenv-bubblewrap {};
@@ -23,7 +24,7 @@ in {
 #    # Include gamemode in the FHS
 #    #extraPkgs = (pkgs: with pkgs; [ gamemode ]);
 #  };
-
+#
 #  steam = prev.steamPackages.steam-fhsenv.overrideAttrs (old: {
 #    specifyHomeDirs = true;
 #    chdirTo = "/home/$USER";
@@ -36,4 +37,4 @@ in {
 #    nativeOnly = true;
 #  });
 #  steamcmd = final.steamPackages.steamcmd;
-   #  })
+#}