add vm for android build

machines/AMD-Workstation/default.nix

@@ -21,6 +21,22 @@
       group = "libvirtd";
       xmlFile = ./vm/win2k22.xml;
     };
+    fedora-build = {
+      autoStart = false;
+      user = config.mainuser;
+      group = "libvirtd";
+      uefi = true;
+      memory = 32 * 1024;
+      sharedMemory = true;
+      cpu = { cores = 6; threads = 2; };
+      devices = {
+        disks = [
+          { diskFile = "/media/libvirt/images/fedora-build.qcow2"; targetName = "vda"; }
+          { diskFile = "/media/libvirt/images/android-zfs.qcow2"; targetName = "sda"; bus = "scsi"; }
+        ];
+        network.macAddress = "52:54:00:f7:be:ef";
+      };
+    };
   };
 
   deviceSpecific.devInfo = {

modules/libvirt-guests/default.nix

@@ -16,6 +16,18 @@ let
       type = types.enum [ "raw" "qcow2" ];
       default = "qcow2";
     };
+    targetName = mkOption {
+      type = types.str;
+      default = "vda";
+    };
+    discard = mkOption {
+      type = types.enum [ "ignore" "unmap" ];
+      default = "unmap";
+    };
+    cache = mkOption {
+      type = types.enum [ "none" "writethrough" "writeback" "directsync" "unsafe" ];
+      default = "writeback";
+    };
   };
   mountOptions.options = {
     sourceDir = mkOption {
@@ -294,9 +306,9 @@ in {
                 ${
                   lib.concatStrings (map (disk: ''
                     <disk type="file" device="disk">
-                      <driver name="qemu" type="${disk.type}" discard="unmap"/>
+                      <driver name="qemu" type="${disk.type}" cache="${disk.cache}" discard="${disk.discard}"/>
                       <source file="${disk.diskFile}"/>
-                      <target dev="vda" bus="${disk.bus}"/>
+                      <target dev="${disk.targetName}" bus="${disk.bus}"/>
                     </disk>
                   '') guest.devices.disks)
                 }