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Update QEMU Nixos Virtual Machine

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The Nixos Qemu VM that are used for VM tests can now start without
boot menu even when using a bootloader.
The Nixos Qemu VM with bootloader can emulate a EFI boot now.
This commit is contained in:
Thomas Strobel
2015-01-26 21:13:31 +01:00
parent b9cc04329b
commit 80afabd5b5
4 changed files with 144 additions and 23 deletions
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87
nixos/modules/virtualisation/qemu-vm.nix
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@@ -36,13 +36,28 @@ let
${toString config.virtualisation.diskSize}M || exit 1
fi
# Create a directory for exchanging data with the VM.
# Create a directory for storing temporary data of the running VM.
if [ -z "$TMPDIR" -o -z "$USE_TMPDIR" ]; then
TMPDIR=$(mktemp -d nix-vm.XXXXXXXXXX --tmpdir)
fi
cd $TMPDIR
# Create a directory for exchanging data with the VM.
mkdir -p $TMPDIR/xchg
${if cfg.useBootLoader then ''
# Create a writable copy/snapshot of the boot disk
# A writable boot disk can be booted from automatically
${pkgs.qemu_kvm}/bin/qemu-img create -f qcow2 -b ${bootDisk}/disk.img $TMPDIR/disk.img || exit 1
${if cfg.useEFIBoot then ''
# VM needs a writable flash BIOS
cp ${bootDisk}/bios.bin $TMPDIR || exit 1
chmod 0644 $TMPDIR/bios.bin || exit 1
'' else ''
''}
'' else ''
''}
cd $TMPDIR
idx=2
extraDisks=""
${flip concatMapStrings cfg.emptyDiskImages (size: ''
@@ -52,7 +67,6 @@ let
'')}
# Start QEMU.
# "-boot menu=on" is there, because I don't know how to make qemu boot from 2nd hd.
exec ${pkgs.qemu_kvm}/bin/qemu-kvm \
-name ${vmName} \
-m ${toString config.virtualisation.memorySize} \
@@ -63,8 +77,11 @@ let
-virtfs local,path=''${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \
${if cfg.useBootLoader then ''
-drive index=0,id=drive1,file=$NIX_DISK_IMAGE,if=virtio,cache=writeback,werror=report \
-drive index=1,id=drive2,file=${bootDisk}/disk.img,if=virtio,readonly \
-boot menu=on \
-drive index=1,id=drive2,file=$TMPDIR/disk.img,media=disk \
${if cfg.useEFIBoot then ''
-pflash $TMPDIR/bios.bin \
'' else ''
''}
'' else ''
-drive file=$NIX_DISK_IMAGE,if=virtio,cache=writeback,werror=report \
-kernel ${config.system.build.toplevel}/kernel \
@@ -74,7 +91,8 @@ let
$extraDisks \
${qemuGraphics} \
${toString config.virtualisation.qemu.options} \
$QEMU_OPTS
$QEMU_OPTS \
$@
'';
@@ -98,23 +116,44 @@ let
''
mkdir $out
diskImage=$out/disk.img
${pkgs.qemu_kvm}/bin/qemu-img create -f qcow2 $diskImage "32M"
bootFlash=$out/bios.bin
${pkgs.qemu_kvm}/bin/qemu-img create -f qcow2 $diskImage "40M"
${if cfg.useEFIBoot then ''
cp ${pkgs.OVMF-CSM}/FV/OVMF.fd $bootFlash
chmod 0644 $bootFlash
'' else ''
''}
'';
buildInputs = [ pkgs.utillinux ];
QEMU_OPTS = if cfg.useEFIBoot
then "-pflash $out/bios.bin -nographic -serial pty"
else "-nographic -serial pty";
}
''
# Create a single /boot partition.
${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
${pkgs.parted}/sbin/parted /dev/vda -- mkpart primary ext2 1M -1s
. /sys/class/block/vda1/uevent
mknod /dev/vda1 b $MAJOR $MINOR
# Create a /boot EFI partition with 40M
${pkgs.gptfdisk}/sbin/sgdisk -G /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -a 1 -n 1:34:2047 -c 1:"BIOS Boot Partition" -t 1:ef02 /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -a 512 -N 2 -c 2:"EFI System" -t 2:ef00 /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -A 1:set:1 /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -A 2:set:2 /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -h 2 /dev/vda
${pkgs.gptfdisk}/sbin/sgdisk -C /dev/vda
${pkgs.utillinux}/bin/sfdisk /dev/vda -A 2
. /sys/class/block/vda2/uevent
mknod /dev/vda2 b $MAJOR $MINOR
. /sys/class/block/vda/uevent
${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L boot /dev/vda1
${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
${pkgs.dosfstools}/bin/mkfs.fat -F16 /dev/vda2
export MTOOLS_SKIP_CHECK=1
${pkgs.mtools}/bin/mlabel -i /dev/vda2 ::boot
# Mount /boot.
# Mount /boot; load necessary modules first.
${pkgs.module_init_tools}/sbin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/nls/nls_cp437.ko || true
${pkgs.module_init_tools}/sbin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/nls/nls_iso8859-1.ko || true
${pkgs.module_init_tools}/sbin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/fat/fat.ko || true
${pkgs.module_init_tools}/sbin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/fat/vfat.ko || true
${pkgs.module_init_tools}/sbin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/efivarfs/efivarfs.ko || true
mkdir /boot
mount /dev/vda1 /boot
mount /dev/vda2 /boot
# This is needed for GRUB 0.97, which doesn't know about virtio devices.
mkdir /boot/grub
@@ -287,6 +326,17 @@ in
'';
};
virtualisation.useEFIBoot =
mkOption {
default = false;
description =
''
If enabled, the virtual machine will provide a EFI boot
manager.
useEFIBoot is ignored if useBootLoader == false.
'';
};
};
config = {
@@ -379,8 +429,8 @@ in
};
} // optionalAttrs cfg.useBootLoader
{ "/boot" =
{ device = "/dev/disk/by-label/boot";
fsType = "ext4";
{ device = "/dev/vdb2";
fsType = "vfat";
options = "ro";
noCheck = true; # fsck fails on a r/o filesystem
};
@@ -413,6 +463,7 @@ in
# Wireless won't work in the VM.
networking.wireless.enable = mkVMOverride false;
networking.connman.enable = mkVMOverride false;
# Speed up booting by not waiting for ARP.
networking.dhcpcd.extraConfig = "noarp";