dotfiles/system/modules/vfio.nix

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{ config
, lib
, pkgs
, ... }:
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let
cfg = config.vfio;
in {
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options.vfio = with lib; mkOption {
type = types.submodule {
options = {
enable = mkOption {
type = types.bool;
default = false;
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description = "Enable GPU passthrough + VM config (probably no intel/nvidia support since I can't test it)";
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};
libvirtdGroup = mkOption {
type = with types; listOf str;
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default = [ ];
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description = "Users to add to libvirtd group";
};
intelCpu = mkOption {
type = types.bool;
default = false;
description = "Whether the CPU is Intel (untested)";
};
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nvidiaGpu = mkOption {
type = types.bool;
default = false;
description = "Whether the GPU is Nvidia (disables AMD-specific workarounds)";
};
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passGpuAtBoot = mkOption {
type = types.bool;
default = false;
description = "Whether to pass the GPU at boot (can be more stable). If false, a bootloader entry to do it will still be available.";
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};
pciIDs = mkOption {
type = with types; listOf str;
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default = [ ];
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description = "PCI passthrough IDs";
};
lookingGlass = mkOption {
default = { };
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type = types.submodule {
options = {
enable = mkOption {
type = types.bool;
default = true;
description = "Enable Looking Glass integration";
};
ivshmem = mkOption {
type = with types; listOf (submodule {
options = {
size = mkOption {
type = types.int;
default = 32;
description = "IVSHMEM size in MB: https://looking-glass.io/docs/B6/install/#determining-memory";
};
owner = mkOption {
type = types.str;
description = "IVSHMEM device owner";
};
};
});
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default = if builtins.length cfg.libvirtdGroup == 1 then [
{ owner = builtins.head cfg.libvirtdGroup; }
] else [ ];
example = [ { size = 32; owner = "user"; } ];
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description = "IVSHMEM/kvmfr config (multiple devices can be created: /dev/kvmfr0, /dev/kvmfr1, and so on)";
};
};
};
description = "Looking glass config";
};
};
};
description = "VFIO settings";
default = { };
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};
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# compatibility so this module loads on non-amd hardware
config = let
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enableIvshmem = cfg.lookingGlass.enable && (builtins.length cfg.lookingGlass.ivshmem) > 0;
in lib.mkIf cfg.enable {
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# add a custom kernel param for early loading vfio drivers
# because if we change boot.initrd options in a specialization, two initrds will be built
# and we don't want to build two initrds
specialisation.vfio.configuration = lib.mkIf (!cfg.passGpuAtBoot) {
boot.kernelParams = [ "early_load_vfio" ];
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# I can't enable early KMS with VFIO, so this will have to do
# (amdgpu resets the font upon being loaded)
systemd.services."systemd-vconsole-setup2" = lib.mkIf (!cfg.nvidiaGpu) {
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = "${pkgs.systemd}/lib/systemd/systemd-vconsole-setup";
};
wantedBy = [ "graphical.target" ];
wants = [ "multi-user.target" ];
after = [ "multi-user.target" ];
};
};
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boot = {
initrd.postDeviceCommands = lib.mkIf (!cfg.passGpuAtBoot) ''
for o in $(cat /proc/cmdline); do
case $o in
early_load_vfio)
loadVfio=1
;;
esac
done
if [[ -n "$loadVfio" ]]; then
modprobe vfio
modprobe vfio_iommu_type1
modprobe vfio_pci
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${if cfg.nvidiaGpu then "" else ''
else
modprobe amdgpu''}
fi
'';
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initrd.kernelModules = [
(if cfg.intelCpu then "kvm-intel" else "kvm-amd")
] ++ (if cfg.passGpuAtBoot then [
"vfio"
"vfio_iommu_type1"
"vfio_pci"
] else []);
initrd.availableKernelModules = lib.mkIf (!cfg.passGpuAtBoot) [
"vfio"
"vfio_iommu_type1"
"vfio_pci"
];
# kvmfrOverlay is defined in pkgs/default.nix
# I use it to keep looking-glass and kvmfr's version pinned
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extraModulePackages =
lib.mkIf enableIvshmem [ ((pkgs.kvmfrOverlay or lib.id) config.boot.kernelPackages.kvmfr) ];
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extraModprobeConfig = ''
options vfio-pci ids=${builtins.concatStringsSep "," cfg.pciIDs} disable_idle_d3=1
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options kvm ignore_msrs=1
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${if enableIvshmem then ''
options kvmfr static_size_mb=${builtins.concatStringsSep "," (map (x: toString x.size) cfg.lookingGlass.ivshmem)}''
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else ""}
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'';
kernelParams = [
(if cfg.intelCpu then "intel_iommu=on" else "amd_iommu=on")
"iommu=pt"
];
kernelModules = [
"vhost-net"
] ++ (if enableIvshmem then [ "kvmfr" ] else []);
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};
services.udev.extraRules = lib.mkIf enableIvshmem
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(builtins.concatStringsSep
""
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(lib.imap0
(i: ivshmem: ''
SUBSYSTEM=="kvmfr", KERNEL=="kvmfr${toString i}", OWNER="${ivshmem.owner}", GROUP="kvm", MODE="0660"
'')
cfg.lookingGlass.ivshmem));
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hardware = {
opengl.enable = true;
} // (lib.optionalAttrs (cfg.enable && !(cfg.nvidiaGpu)) {
# disable early KMS so GPU can be properly unbound
# can't use mkif because the option may not even exist
amdgpu.loadInInitrd = false;
});
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# needed for virt-manager
programs.dconf.enable = true;
virtualisation.libvirtd = {
enable = true;
onBoot = "ignore";
onShutdown = "shutdown";
qemu = {
package = pkgs.qemu_kvm;
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ovmf.enable = true;
# Full is needed for TPM and secure boot emulation
ovmf.packages = [ pkgs.OVMFFull.fd ];
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# TPM emulation
swtpm.enable = true;
verbatimConfig = ''
cgroup_device_acl = [
"/dev/kvmfr0",
"/dev/vfio/vfio", "/dev/vfio/11", "/dev/vfio/12",
"/dev/null", "/dev/full", "/dev/zero",
"/dev/random", "/dev/urandom",
"/dev/ptmx", "/dev/kvm"
]
'';
# might disable this later
runAsRoot = true;
};
};
virtualisation.spiceUSBRedirection.enable = true;
users.groups.libvirtd.members = [ "root" ] ++ cfg.libvirtdGroup;
environment.systemPackages = with pkgs; [ virtiofsd ];
};
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}