feat: backup before adding vms

nixos/ryu/vms/win11.nix

@@ -0,0 +1,154 @@
+{ config, pkgs, lib, ... }:
+
+{
+  virtualisation.libvirtd.enable = true;
+  virtualisation.libvirtd.qemu.ovmf.enable = true;
+  virtualisation.libvirtd.qemu.swtpm.enable = true;
+
+  # IOMMU and VFIO settings
+  boot.kernelParams = [
+    "amd_iommu=on"  # Use "intel_iommu=on" for Intel CPUs
+    "iommu=pt"
+    "vfio-pci.ids=10de:2504,10de:228e"  # Replace with your GPU's vendor:device IDs
+  ];
+
+  boot.kernelModules = [
+    "vfio_pci"
+    "vfio"
+    "vfio_iommu_type1"
+    "vfio_virqfd"
+  ];
+
+  # Early loading of VFIO
+  boot.initrd.kernelModules = [
+    "vfio_pci"
+    "vfio"
+    "vfio_iommu_type1"
+    "vfio_virqfd"
+  ];
+
+  # Define the Windows 11 VM
+  virtualisation.libvirtd.qemu.verbatimConfig = ''
+    user = "root"
+    group = "root"
+    cgroup_device_acl = [
+      "/dev/null", "/dev/full", "/dev/zero",
+      "/dev/random", "/dev/urandom",
+      "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
+      "/dev/rtc","/dev/hpet"
+    ]
+  '';
+
+  virtualisation.libvirtd.hooks.qemu = {
+    "win11" = ''
+      # Add any VM hooks here if needed
+    '';
+  };
+
+  systemd.services.libvirtd-win11 = {
+    description = "Windows 11 VM";
+    after = [ "libvirtd.service" ];
+    requires = [ "libvirtd.service" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = "yes";
+      ExecStart = let
+        win11xml = pkgs.writeText "win11.xml" ''
+          <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
+            <name>win11</name>
+            <memory unit='GiB'>16</memory>
+            <vcpu placement='static'>8</vcpu>
+            <cpu mode='host-passthrough' check='none'>
+              <topology sockets='1' dies='1' cores='4' threads='2'/>
+              <feature policy='require' name='topoext'/>
+            </cpu>
+            <os>
+              <type arch='x86_64' machine='pc-q35-8.0'>hvm</type>
+              <loader readonly='yes' type='pflash'>/run/libvirt/nix-ovmf/OVMF_CODE.fd</loader>
+              <nvram>/var/lib/libvirt/qemu/nvram/win11_VARS.fd</nvram>
+              <boot dev='hd'/>
+              <boot dev='cdrom'/>
+            </os>
+            <features>
+              <acpi/>
+              <apic/>
+              <hyperv mode='custom'>
+                <relaxed state='on'/>
+                <vapic state='on'/>
+                <spinlocks state='on' retries='8191'/>
+                <vendor_id state='on' value='123456789123'/>
+              </hyperv>
+              <vmport state='off'/>
+            </features>
+            <devices>
+              <disk type='file' device='disk'>
+                <driver name='qemu' type='qcow2' discard='unmap'/>
+                <source file='/var/lib/libvirt/images/win11.qcow2'/>
+                <target dev='vda' bus='virtio'/>
+              </disk>
+              <disk type='file' device='cdrom'>
+                <driver name='qemu' type='raw'/>
+                <source file='/var/lib/libvirt/images/Win11.iso'/>
+                <target dev='sda' bus='sata'/>
+                <readonly/>
+              </disk>
+              <disk type='file' device='cdrom'>
+                <driver name='qemu' type='raw'/>
+                <source file='/var/lib/libvirt/images/virtio-win.iso'/>
+                <target dev='sdb' bus='sata'/>
+                <readonly/>
+              </disk>
+              <interface type='bridge'>
+                <source bridge='virbr0'/>
+                <model type='virtio'/>
+              </interface>
+              <hostdev mode='subsystem' type='pci' managed='yes'>
+                <source>
+                  <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
+                </source>
+              </hostdev>
+              <hostdev mode='subsystem' type='pci' managed='yes'>
+                <source>
+                  <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
+                </source>
+              </hostdev>
+              <memballoon model='virtio'/>
+            </devices>
+            <qemu:commandline>
+              <qemu:arg value='-cpu'/>
+              <qemu:arg value='host,hv_time,kvm=off,hv_vendor_id=null'/>
+              <qemu:arg value='-device'/>
+              <qemu:arg value='ivshmem-plain,memdev=looking-glass'/>
+              <qemu:arg value='-object'/>
+              <qemu:arg value='memory-backend-file,id=looking-glass,share=on,mem-path=/dev/shm/looking-glass,size=32M'/>
+            </qemu:commandline>
+          </domain>
+        '';
+      in "${pkgs.libvirt}/bin/virsh define ${win11xml} && ${pkgs.libvirt}/bin/virsh start win11";
+      ExecStop = "${pkgs.libvirt}/bin/virsh shutdown win11";
+    };
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  # Setup Looking Glass shared memory
+  systemd.tmpfiles.rules = [
+    "f /dev/shm/looking-glass 0660 root qemu-libvirtd 32M"
+  ];
+
+  environment.systemPackages = with pkgs; [
+    virt-manager
+    OVMF
+    swtpm
+    win-virtio
+    looking-glass-client
+  ];
+
+  # Networking for VM
+  networking.bridges.virbr0.interfaces = [];
+  networking.interfaces.virbr0.useDHCP = true;
+
+  # Enable huge pages for better performance
+  boot.kernel.sysctl."vm.nr_hugepages" = 8192;
+
+  # Optional: Enable looking glass for low-latency VM display
+}