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qemu-vm: treat EFI vars as state, similarly to diskImage

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This commit is contained in:
Daniel Fullmer 2020-06-14 10:20:21 -04:00
parent ee43e2f1ea
commit 0b4e216775
1 changed files with 20 additions and 6 deletions
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26
nixos/modules/virtualisation/qemu-vm.nix
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@ -105,7 +105,7 @@ let
else if pkgs.stdenv.isAarch64 then "${pkgs.OVMF.fd}/FV/AAVMF"
else throw "No EFI firmware available for platform";
efiFirmware = "${efiPrefix}_CODE.fd";
efiVars = "${efiPrefix}_VARS.fd";
efiVarsDefault = "${efiPrefix}_VARS.fd";
# Shell script to start the VM.
startVM =
@ -132,10 +132,14 @@ let
# A writable boot disk can be booted from automatically.
${qemu}/bin/qemu-img create -f qcow2 -b ${bootDisk}/disk.img $TMPDIR/disk.img || exit 1
NIX_EFI_VARS=$(readlink -f ''${NIX_EFI_VARS:-${cfg.efiVars}})
${if cfg.useEFIBoot then ''
# VM needs writable EFI vars
cp ${bootDisk}/EFI_VARS.fd $TMPDIR || exit 1
chmod 0644 $TMPDIR/EFI_VARS.fd || exit 1
if ! test -e "$NIX_EFI_VARS"; then
cp ${bootDisk}/efi-vars.fd "$NIX_EFI_VARS" || exit 1
chmod 0644 "$NIX_EFI_VARS" || exit 1
fi
'' else ''
''}
'' else ''
@ -182,8 +186,8 @@ let
diskImage=$out/disk.img
${qemu}/bin/qemu-img create -f qcow2 $diskImage "60M"
${if cfg.useEFIBoot then ''
efiVars=$out/EFI_VARS.fd
cp ${efiVars} $efiVars
efiVars=$out/efi-vars.fd
cp ${efiVarsDefault} $efiVars
chmod 0644 $efiVars
'' else ''
''}
@ -480,6 +484,16 @@ in
'';
};
virtualisation.efiVars =
mkOption {
default = "./${vmName}-efi-vars.fd";
description =
''
Path to nvram image containing UEFI variables. The will be created
on startup if it does not exist.
'';
};
virtualisation.bios =
mkOption {
default = null;
@ -570,7 +584,7 @@ in
])
(mkIf cfg.useEFIBoot [
"-drive if=pflash,format=raw,unit=0,readonly,file=${efiFirmware}"
"-drive if=pflash,format=raw,unit=1,file=$TMPDIR/EFI_VARS.fd"
"-drive if=pflash,format=raw,unit=1,file=$NIX_EFI_VARS"
])
(mkIf (cfg.bios != null) [
"-bios ${cfg.bios}/bios.bin"