68 lines
1.8 KiB
Nix
68 lines
1.8 KiB
Nix
{ config, pkgs, ... }:
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let
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commonKernelParams = [
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# VM/GPU passthrough
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"amd_iommu=on"
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"iommu=pt"
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"nested=1"
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# Virtualization nonsense
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"transparent_hugepage=never"
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# Isolate devices into IOMMU groups
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"pcie_acs_override=downstream,multifunction"
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"pci=routeirq"
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];
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in {
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boot = {
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# Must be Zen for IOMMU isolation
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kernelPackages = pkgs.unstable.linuxPackages_zen;
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kernel.sysctl."vm.max_map_count" = 2147483642;
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kernelParams = commonKernelParams ++ [ "vfio-pci.ids=10de:1f82,10de:10fa" ];
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blacklistedKernelModules = [ "pcspkr" ];
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# Needed for GPU passthrough
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initrd.kernelModules = [
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"vfio"
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"vfio_pci"
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"vfio_iommu_type1"
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];
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initrd.systemd = {
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enable = true;
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services.root-reset = {
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description = "Reset root and snapshot last boot";
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wantedBy = [ "initrd.target" ];
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before = [ "sysroot.mount" ];
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after = [ "dev-${config.networking.hostName}-root.device" ];
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unitConfig.DefaultDependencies = "no";
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serviceConfig.Type = "oneshot";
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script = ''
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mkdir -p /mnt
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mount /dev/${config.networking.hostName}/root /mnt
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if [[ -e /mnt/prev ]]; then
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btrfs subvolume delete /mnt/prev
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fi
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btrfs subvolume snapshot /mnt/root /mnt/prev
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btrfs subvolume list -o /mnt/root | cut -f9 -d' ' | while read subvolume; do
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btrfs subvolume delete "/mnt/$subvolume"
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done
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btrfs subvolume delete /mnt/root
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btrfs subvolume create /mnt/root
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umount /mnt
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'';
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};
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};
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};
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# Use second GPU on boot
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specialisation.gputwo.configuration = {
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boot.kernelParams = commonKernelParams ++ [ "vfio-pci.ids=10de:2504,10de:228e" ];
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};
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}
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