QEMU: Difference between revisions

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[https://www.qemu.org/ QEMU] is a generic and open source machine emulator and virtualizer.

For running virtual machines as a services see [[Libvirt]].

== Setup ==

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outputs = { self, nixpkgs }:

let

~~pkgs = import nixpkgs {~~ system = "x86_64-linux"; };

# Put your actual system of your machine here. In VM terms it is the "HOST"

~~pkgsAarch64~~ = import nixpkgs { system = ~~"aarch64-linux"~~; };

buildPlatform = "x86_64-linux";

# Put the system you want to emulate here. In VM terms it is the "GUEST"

hostPlatform = "aarch64-linux";

pkgs = import nixpkgs { system = buildPlatform; };

~~iso~~ = (~~pkgsAarch64~~.nixos {

vmConfig = (pkgs.nixos {

imports = [ "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-base.nix" ];

}).config.system.build.isoImage;

nixpkgs = { inherit buildPlatform hostPlatform; };

});

vmIso = vmConfig.config.system.build.isoImage;

vmPkgs = vmConfig.pkgs;

vmScript = pkgs.~~writeScriptBin~~ "run-nixos-vm" ''

vmScript = pkgs.writeShellScriptBin "run-nixos-vm" ''

~~#!${pkgs.runtimeShell}~~

${pkgs.qemu}/bin/qemu-system-aarch64 \

-machine virt,gic-version=max \

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-m 2G \

-smp 4 \

-drive file=$(echo ${~~iso~~}/iso/*.iso),format=raw,readonly=on \

-drive file=$(echo ${vmIso}/iso/*.iso),format=raw,readonly=on \

-nographic \

-bios ${~~pkgsAarch64~~.OVMF.fd}/FV/~~QEMU_EFI~~.fd

-bios ${vmPkgs.OVMF.fd}/FV/OVMF.fd

'';

in {

~~defaultPackage~~.x86_64-linux = vmScript;

packages.x86_64-linux.default = vmScript;

};

}

</syntaxhighlight>Alternatively a different iso file can be specified in the drive-parameter, for example for Ubuntu Server ARM64.

</syntaxhighlight>

Alternatively a different iso file can be specified in the drive-parameter, for example for Ubuntu Server ARM64.

Make sure to adjust the 2 toplevel variables to set up the cross compilation correctly. If your target is not AARCH64, you have to use the correct qemu binay in the start script.

[[Category:Virtualization]]

@@ Line 1: / Line 1: @@
 [https://www.qemu.org/ QEMU] is a generic and open source machine emulator and virtualizer.
+For running virtual machines as a services see [[Libvirt]].
 == Setup ==
@@ Line 51: / Line 53: @@
    outputs = { self, nixpkgs }:
    let
-     pkgs = import nixpkgs { system = "x86_64-linux"; };
+     # Put your actual system of your machine here. In VM terms it is the "HOST"
-     pkgsAarch64 = import nixpkgs { system = "aarch64-linux"; };
+    buildPlatform = "x86_64-linux";
+    # Put the system you want to emulate here. In VM terms it is the "GUEST"
+    hostPlatform = "aarch64-linux";
+     pkgs = import nixpkgs { system = buildPlatform; };
-     iso = (pkgsAarch64.nixos {
+     vmConfig = (pkgs.nixos {
        imports = [ "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-base.nix" ];
-     }).config.system.build.isoImage;
+      nixpkgs = { inherit buildPlatform hostPlatform; };
+     });
+    vmIso = vmConfig.config.system.build.isoImage;
+    vmPkgs = vmConfig.pkgs;
-     vmScript = pkgs.writeScriptBin "run-nixos-vm" ''
+     vmScript = pkgs.writeShellScriptBin "run-nixos-vm" ''
-      #!${pkgs.runtimeShell}
        ${pkgs.qemu}/bin/qemu-system-aarch64 \
          -machine virt,gic-version=max \
@@ Line 65: / Line 74: @@
          -m 2G \
          -smp 4 \
-         -drive file=$(echo ${iso}/iso/*.iso),format=raw,readonly=on \
+         -drive file=$(echo ${vmIso}/iso/*.iso),format=raw,readonly=on \
          -nographic \
-         -bios ${pkgsAarch64.OVMF.fd}/FV/QEMU_EFI.fd
+         -bios ${vmPkgs.OVMF.fd}/FV/OVMF.fd
      '';
    in {
-     defaultPackage.x86_64-linux = vmScript;
+     packages.x86_64-linux.default = vmScript;
    };
 }
-</syntaxhighlight>Alternatively a different iso file can be specified in the drive-parameter, for example for Ubuntu Server ARM64.
+</syntaxhighlight>
+Alternatively a different iso file can be specified in the drive-parameter, for example for Ubuntu Server ARM64.
+Make sure to adjust the 2 toplevel variables to set up the cross compilation correctly. If your target is not AARCH64, you have to use the correct qemu binay in the start script.
 [[Category:Virtualization]]