persistMode=backing seeds the persistent OS disk as a thin qcow2 overlay
(`qemu-img create -b <storeImage>`) instead of a full cp, so many VMs share one
base image and each holds only its deltas. Because the overlay reads through a
store path that nix does not otherwise pin (the disk lives outside the store),
and because even a cp'd Windows disk backs onto the store chain, a per-VM
oneshot `vm.vmix-gcroot@<name>` reads the overlay's ACTUAL backing_file at boot
(not the config's current image, which drifts after a rebuild) and symlinks it
under /nix/var/nix/gcroots. It runs before the VM service and outside its
ProtectSystem sandbox. Fires whenever the OS disk is persistent, covering copy
too. Default stays copy, so existing VMs are unaffected.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117qMyjpuXsjpVAcpJbFD8g
Three things, all in service of putting Proxmox in a VM that can still hand a
GPU to its own guests, and of a Windows VM whose profile survives its OS disk.
pci.viommu.enable emits `-device intel-iommu,intremap=on,caching-mode=on` and
forces kernel-irqchip=split, which interrupt remapping requires. Without an
IOMMU of its own a guest cannot bind a passed-through device to vfio-pci, so
it can never forward one on. The device leads the command line because QEMU
realizes devices in order and intel-iommu must precede what it translates.
pci.vgaPassthrough (default true, so nothing changes for existing VMs) makes
x-vga=on optional. It was forced on the first passthrough device, which is
wrong for a card the guest only forwards onward: it claims the VGA path the
emulated console adapter needs.
customizeImage gains extraDisk, a blank disk attached for the Audit Mode boot
and emitted as the derivation's `data` output. generalize uses it for dataDisk
and profilesDirectory, so the disk is partitioned and the profile relocated
under OOBE in the build VM. That is what removes the need for delayOobeRun --
previously the volume ProfilesDirectory names could not exist until the image
reached real hardware. A second output rather than a directory keeps ${image}
meaning the OS qcow2 for every existing consumer.
generalize also picks up staticIP and profilesDirectory.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117qMyjpuXsjpVAcpJbFD8g
- Add nicModel option (default: virtio-net-pci) to allow e1000 for
images without VirtIO drivers
- Restore MAS activation with slmgr /ipk to switch back from IoT
Enterprise S to Enterprise LTSC (which has native RDP server)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
When spice.vgamem is set (e.g. 64), uses -device qxl-vga,vgamem_mb=N
instead of -vga qxl (which defaults to 16MB). When null (default),
uses -vga qxl for backwards compatibility.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
