hardware.cpu: add iommu flags

devices/surface/default.nix

@@ -55,7 +55,6 @@ inputs:
       };
       bugs = [ "xmunet" "suspend-hibernate-no-platform" ];
     };
-    boot.kernelParams = [ "intel_iommu=off" ];
     environment.systemPackages = with inputs.pkgs; [ maliit-keyboard maliit-framework ];
     powerManagement.resumeCommands = ''${inputs.pkgs.systemd}/bin/systemctl restart iptsd'';
     services.iptsd.config =

modules/hardware/default.nix

@@ -50,9 +50,10 @@ inputs:
       {
         hardware.cpu = builtins.listToAttrs
           (map (name: { inherit name; value = { updateMicrocode = true; }; }) hardware.cpus);
-        boot.initrd.availableKernelModules =
-          let
-            modules =
+        boot =
+        {
+          initrd.availableKernelModules =
+            let modules =
             {
               intel =
               [
@@ -60,8 +61,11 @@ inputs:
               ];
               amd = [];
             };
-          in
-            builtins.concatLists (map (cpu: modules.${cpu}) hardware.cpus);
+            in builtins.concatLists (map (cpu: modules.${cpu}) hardware.cpus);
+          kernelParams =
+            let params = { intel = [ "intel_iommu=off" ]; amd = [ "amd_iommu=fullflush" ]; };
+            in builtins.concatLists (map (cpu: params.${cpu}) hardware.cpus);
+        };
       }
     )
   ];

modules/hardware/gpu.nix

@@ -67,7 +67,7 @@ inputs:
         boot =
         {
           kernelParams = inputs.lib.mkIf (builtins.elem "amd" gpus)
-            [ "radeon.cik_support=0" "amdgpu.cik_support=1" "radeon.si_support=0" "amdgpu.si_support=1" "iommu=pt" ];
+            [ "radeon.cik_support=0" "amdgpu.cik_support=1" "radeon.si_support=0" "amdgpu.si_support=1" ];
           blacklistedKernelModules = [ "nouveau" ];
         };
         environment.variables.VDPAU_DRIVER = inputs.lib.mkIf (builtins.elem "intel" gpus) "va_gl";