dc444e55dc
See https://patchwork.kernel.org/project/qemu-devel/patch/20200706135650.438362-5-stefanha@redhat.com/ Change-Id: I3ba9a1c1f8b0be27f215da6b71cd3a0ded513a75 Reviewed-on: https://cl.tvl.fyi/c/depot/+/11502 Tested-by: BuildkiteCI Autosubmit: flokli <flokli@flokli.de> Reviewed-by: raitobezarius <tvl@lahfa.xyz>
113 lines
3.1 KiB
Nix
113 lines
3.1 KiB
Nix
{ depot, pkgs, ... }:
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rec {
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# A binary that sets up /nix/store from virtiofs, lists all store paths, and
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# powers off the machine.
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tvix-init = depot.nix.buildGo.program {
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name = "tvix-init";
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srcs = [
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./tvix-init.go
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];
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};
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# A kernel with virtiofs support baked in
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# TODO: make a smaller kernel, we don't need a gazillion filesystems and
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# device drivers in it.
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kernel = pkgs.buildLinux ({ } // {
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inherit (pkgs.linuxPackages_latest.kernel) src version modDirVersion;
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autoModules = false;
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kernelPreferBuiltin = true;
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ignoreConfigErrors = true;
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kernelPatches = [ ];
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structuredExtraConfig = with pkgs.lib.kernel; {
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FUSE_FS = option yes;
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DAX_DRIVER = option yes;
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DAX = option yes;
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FS_DAX = option yes;
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VIRTIO_FS = option yes;
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VIRTIO = option yes;
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ZONE_DEVICE = option yes;
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};
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});
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# A build framework for minimal initrds
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uroot = pkgs.buildGoModule rec {
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pname = "u-root";
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version = "0.14.0";
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src = pkgs.fetchFromGitHub {
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owner = "u-root";
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repo = "u-root";
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rev = "v${version}";
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hash = "sha256-8zA3pHf45MdUcq/MA/mf0KCTxB1viHieU/oigYwIPgo=";
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};
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vendorHash = null;
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doCheck = false; # Some tests invoke /bin/bash
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};
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# Use u-root to build a initrd with our tvix-init inside.
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initrd = pkgs.stdenv.mkDerivation {
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name = "initrd.cpio";
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nativeBuildInputs = [ pkgs.go ];
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# https://github.com/u-root/u-root/issues/2466
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buildCommand = ''
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mkdir -p /tmp/go/src/github.com/u-root/
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cp -R ${uroot.src} /tmp/go/src/github.com/u-root/u-root
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cd /tmp/go/src/github.com/u-root/u-root
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chmod +w .
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cp ${tvix-init}/bin/tvix-init tvix-init
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export HOME=$(mktemp -d)
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export GOROOT="$(go env GOROOT)"
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GO111MODULE=off GOPATH=/tmp/go GOPROXY=off ${uroot}/bin/u-root -files ./tvix-init -initcmd "/tvix-init" -o $out
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'';
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};
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# Start a `tvix-store` virtiofs daemon from $PATH, then a cloud-hypervisor
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# pointed to it.
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# Supports the following env vars (and defaults)
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# CH_NUM_CPUS=2
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# CH_MEM_SIZE=512M
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# CH_CMDLINE=""
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runVM = pkgs.writers.writeBashBin "run-tvix-vm" ''
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tempdir=$(mktemp -d)
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cleanup() {
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kill $virtiofsd_pid
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if [[ -n ''${work_dir-} ]]; then
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chmod -R u+rw "$tempdir"
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rm -rf "$tempdir"
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fi
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}
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trap cleanup EXIT
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# Spin up the virtiofs daemon
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tvix-store --otlp=false virtiofs -l $tempdir/tvix.sock &
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virtiofsd_pid=$!
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# Wait for the socket to exist.
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until [ -e $tempdir/tvix.sock ]; do sleep 0.1; done
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CH_NUM_CPUS="''${CH_NUM_CPUS:-2}"
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CH_MEM_SIZE="''${CH_MEM_SIZE:-512M}"
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CH_CMDLINE="''${CH_CMDLINE:-}"
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# spin up cloud_hypervisor
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${pkgs.cloud-hypervisor}/bin/cloud-hypervisor \
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--cpus boot=$CH_NUM_CPU \
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--memory mergeable=on,shared=on,size=$CH_MEM_SIZE \
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--console null \
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--serial tty \
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--kernel ${kernel.dev}/vmlinux \
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--initramfs ${initrd} \
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--cmdline "console=ttyS0 $CH_CMDLINE" \
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--fs tag=tvix,socket=$tempdir/tvix.sock,num_queues=''${CH_NUM_CPU},queue_size=512
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'';
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meta.ci.targets = [
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"initrd"
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"kernel"
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"runVM"
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];
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}
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