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virtualization/qemu-vm: fix and improve virtio/scsi switching

This commit is contained in:
Stefan Junker 2018-09-22 23:28:02 +02:00
parent 9e87b56dd1
commit f777d2b719
2 changed files with 39 additions and 21 deletions

View file

@ -32,15 +32,21 @@ let
# expressions and shell script stuff.
mkDiskIfaceDriveFlag = idx: driveArgs: let
inherit (cfg.qemu) diskInterface;
isSCSI = diskInterface == "scsi";
# The drive identifier created by incrementing the index by one using the
# shell.
drvId = "drive$((${idx} + 1))";
dvcId = "${diskInterface}$((${idx} + 1))";
# NOTE: DO NOT shell escape, because this may contain shell variables.
commonArgs = "index=${idx},id=${drvId},${driveArgs}";
isSCSI = diskInterface == "scsi";
devArgs = "${diskInterface}-hd,drive=${drvId}";
args = "-drive ${commonArgs},if=none -device lsi53c895a -device ${devArgs}";
in if isSCSI then args else "-drive ${commonArgs},if=${diskInterface}";
commonDriveArgs = "media=disk,id=${drvId},${driveArgs}";
commonInterfaceArgs = "drive=${drvId},id=${dvcId},bootindex=${idx}";
in lib.concatStrings [
"-drive ${commonDriveArgs},if=none "
''${if isSCSI then
"-device lsi53c895a -device ${diskInterface}-hd,${commonInterfaceArgs}"
else
"-device virtio-blk-pci,scsi=off,${commonInterfaceArgs}"} ''
];
# Shell script to start the VM.
startVM =
@ -97,15 +103,15 @@ let
-virtfs local,path=/nix/store,security_model=none,mount_tag=store \
-virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
-virtfs local,path=''${SHARED_DIR:-$TMPDIR/xchg},security_model=none,mount_tag=shared \
${mkDiskIfaceDriveFlag "1" "file=$NIX_DISK_IMAGE,media=disk,cache=writeback,werror=report"} \
${if cfg.useBootLoader then ''
${mkDiskIfaceDriveFlag "0" "file=$NIX_DISK_IMAGE,cache=writeback,werror=report"} \
${mkDiskIfaceDriveFlag "1" "file=$TMPDIR/disk.img,media=disk"} \
-boot menu=on \
${mkDiskIfaceDriveFlag "0" "file=$TMPDIR/disk.img,media=disk"} \
${if cfg.useEFIBoot then ''
-pflash $TMPDIR/bios.bin \
'' else ''
''}
'' else ''
${mkDiskIfaceDriveFlag "0" "file=$NIX_DISK_IMAGE,cache=writeback,werror=report"} \
\''}
'' else '' \
-kernel ${config.system.build.toplevel}/kernel \
-initrd ${config.system.build.toplevel}/initrd \
-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${consoles} $QEMU_KERNEL_PARAMS" \
@ -141,8 +147,9 @@ let
'';
buildInputs = [ pkgs.utillinux ];
QEMU_OPTS = if cfg.useEFIBoot
then "-pflash $out/bios.bin -nographic -serial pty"
else "-nographic -serial pty";
then "-pflash $out/bios.bin -nographic"
else "-nographic";
diskInterface = cfg.qemu.diskInterface;
}
''
# Create a /boot EFI partition with 40M and arbitrary but fixed GUIDs for reproducibility
@ -155,10 +162,10 @@ let
--partition-guid=1:1C06F03B-704E-4657-B9CD-681A087A2FDC \
--partition-guid=2:970C694F-AFD0-4B99-B750-CDB7A329AB6F \
--hybrid 2 \
--recompute-chs /dev/vda
${pkgs.dosfstools}/bin/mkfs.fat -F16 /dev/vda2
--recompute-chs ${config.virtualisation.bootDevice}
${pkgs.dosfstools}/bin/mkfs.fat -F16 ${config.virtualisation.bootDevice}2
export MTOOLS_SKIP_CHECK=1
${pkgs.mtools}/bin/mlabel -i /dev/vda2 ::boot
${pkgs.mtools}/bin/mlabel -i ${config.virtualisation.bootDevice}2 ::boot
# Mount /boot; load necessary modules first.
${pkgs.kmod}/bin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/nls/nls_cp437.ko.xz || true
@ -167,11 +174,11 @@ let
${pkgs.kmod}/bin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/fat/vfat.ko.xz || true
${pkgs.kmod}/bin/insmod ${pkgs.linux}/lib/modules/*/kernel/fs/efivarfs/efivarfs.ko.xz || true
mkdir /boot
mount /dev/vda2 /boot
mount ${config.virtualisation.bootDevice}2 /boot
# This is needed for GRUB 0.97, which doesn't know about virtio devices.
mkdir /boot/grub
echo '(hd0) /dev/vda' > /boot/grub/device.map
echo '(hd0) ${config.virtualisation.bootDevice}' > /boot/grub/device.map
# Install GRUB and generate the GRUB boot menu.
touch /etc/NIXOS
@ -464,7 +471,8 @@ in
boot.initrd.availableKernelModules =
optional cfg.writableStore "overlay"
++ optional (cfg.qemu.diskInterface == "scsi") "sym53c8xx";
++ optional (cfg.qemu.diskInterface == "scsi") "sym53c8xx"
++ optional (cfg.qemu.diskInterface == "scsi") "virtio_scsi";
virtualisation.bootDevice =
mkDefault (if cfg.qemu.diskInterface == "scsi" then "/dev/sda" else "/dev/vda");

View file

@ -3,8 +3,9 @@
, img ? pkgs.stdenv.hostPlatform.platform.kernelTarget
, storeDir ? builtins.storeDir
, rootModules ?
[ "virtio_pci" "virtio_mmio" "virtio_blk" "virtio_balloon" "virtio_rng" "ext4" "unix" "9p" "9pnet_virtio" "crc32c_generic" ]
[ "virtio_pci" "virtio_mmio" "virtio_blk" "virtio_balloon" "virtio_rng" "ext4" "unix" "9p" "9pnet_virtio" "crc32c_generic" "sym53c8xx" "virtio_scsi" "ahci "]
++ pkgs.lib.optional (pkgs.stdenv.isi686 || pkgs.stdenv.isx86_64) "rtc_cmos"
, config
}:
with pkgs;
@ -196,9 +197,17 @@ rec {
${qemuBinary qemu} \
-nographic -no-reboot \
-device virtio-rng-pci \
${if "$diskInterface" == "scsi" then '' \
\ # FIXME: /dev/sda is not created within the VM
-device lsi53c895a \
-device scsi-hd,drive=hd,id=scsi1,bootindex=1 \
''${diskImage:+-drive file=$diskImage,media=disk,if=none,id=hd,cache=unsafe,werror=report} \
'' else '' \
-drive file=$diskImage,media=disk,if=none,id=hd \
-device virtio-blk-pci,scsi=off,drive=hd,id=virtio0,bootindex=1 \
\''}
-virtfs local,path=${storeDir},security_model=none,mount_tag=store \
-virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
''${diskImage:+-drive file=$diskImage,if=virtio,cache=unsafe,werror=report} \
-kernel ${kernel}/${img} \
-initrd ${initrd}/initrd \
-append "console=${qemuSerialDevice} panic=1 command=${stage2Init} out=$out mountDisk=$mountDisk loglevel=4" \
@ -298,12 +307,13 @@ rec {
`run-vm' will be left behind in the temporary build directory
that allows you to boot into the VM and debug it interactively. */
runInLinuxVM = drv: lib.overrideDerivation drv ({ memSize ? 512, QEMU_OPTS ? "", args, builder, ... }: {
runInLinuxVM = drv: lib.overrideDerivation drv ({ memSize ? 512, QEMU_OPTS ? "", args, builder, ... } @ moreArgs : {
requiredSystemFeatures = [ "kvm" ];
builder = "${bash}/bin/sh";
args = ["-e" (vmRunCommand qemuCommandLinux)];
origArgs = args;
origBuilder = builder;
diskInterface = "${moreArgs.diskInterface}";
QEMU_OPTS = "${QEMU_OPTS} -m ${toString memSize}";
passAsFile = []; # HACK fix - see https://github.com/NixOS/nixpkgs/issues/16742
});