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qemu-vm: split EFI NVRAM into CODE and VARS

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This commit is contained in:
Daniel Fullmer 2020-06-13 23:47:26 -04:00
parent 90bf7332e1
commit d7e3312ab1
1 changed files with 16 additions and 10 deletions
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26
nixos/modules/virtualisation/qemu-vm.nix
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@ -99,6 +99,10 @@ let
addDeviceNames = addDeviceNames =
imap1 (idx: drive: drive // { device = driveDeviceName idx; }); imap1 (idx: drive: drive // { device = driveDeviceName idx; });
efiPrefix = "${pkgs.OVMF.fd}/FV/OVMF";
efiFirmware = "${efiPrefix}_CODE.fd";
efiVars = "${efiPrefix}_VARS.fd";
# Shell script to start the VM. # Shell script to start the VM.
startVM = startVM =
'' ''
@ -125,9 +129,9 @@ let
${qemu}/bin/qemu-img create -f qcow2 -b ${bootDisk}/disk.img $TMPDIR/disk.img || exit 1 ${qemu}/bin/qemu-img create -f qcow2 -b ${bootDisk}/disk.img $TMPDIR/disk.img || exit 1
${if cfg.useEFIBoot then '' ${if cfg.useEFIBoot then ''
# VM needs a writable flash BIOS. # VM needs writable EFI vars
cp ${bootDisk}/bios.bin $TMPDIR || exit 1 cp ${bootDisk}/EFI_VARS.fd $TMPDIR || exit 1
chmod 0644 $TMPDIR/bios.bin || exit 1 chmod 0644 $TMPDIR/EFI_VARS.fd || exit 1
'' else '' '' else ''
''} ''}
'' else '' '' else ''
@ -172,18 +176,19 @@ let
'' ''
mkdir $out mkdir $out
diskImage=$out/disk.img diskImage=$out/disk.img
bootFlash=$out/bios.bin
${qemu}/bin/qemu-img create -f qcow2 $diskImage "40M" ${qemu}/bin/qemu-img create -f qcow2 $diskImage "40M"
${if cfg.useEFIBoot then '' ${if cfg.useEFIBoot then ''
cp ${pkgs.OVMF-CSM.fd}/FV/OVMF.fd $bootFlash efiVars=$out/EFI_VARS.fd
chmod 0644 $bootFlash cp ${efiVars} $efiVars
chmod 0644 $efiVars
'' else '' '' else ''
''} ''}
''; '';
buildInputs = [ pkgs.utillinux ]; buildInputs = [ pkgs.utillinux ];
QEMU_OPTS = if cfg.useEFIBoot QEMU_OPTS = "-nographic -serial stdio -monitor none"
then "-pflash $out/bios.bin -nographic -serial pty" + lib.optionalString cfg.useEFIBoot (
else "-nographic -serial pty"; " -drive if=pflash,format=raw,unit=0,readonly=on,file=${efiFirmware}"
+ " -drive if=pflash,format=raw,unit=1,file=$efiVars");
} }
'' ''
# Create a /boot EFI partition with 40M and arbitrary but fixed GUIDs for reproducibility # Create a /boot EFI partition with 40M and arbitrary but fixed GUIDs for reproducibility
@ -560,7 +565,8 @@ in
''-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${consoles} $QEMU_KERNEL_PARAMS"'' ''-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${consoles} $QEMU_KERNEL_PARAMS"''
]) ])
(mkIf cfg.useEFIBoot [ (mkIf cfg.useEFIBoot [
"-pflash $TMPDIR/bios.bin" "-drive if=pflash,format=raw,unit=0,readonly,file=${efiFirmware}"
"-drive if=pflash,format=raw,unit=1,file=$TMPDIR/EFI_VARS.fd"
]) ])
(mkIf (cfg.bios != null) [ (mkIf (cfg.bios != null) [
"-bios ${cfg.bios}/bios.bin" "-bios ${cfg.bios}/bios.bin"