From 5dbd4f32433b4f8511c702ee8bb66e8b4fff7b87 Mon Sep 17 00:00:00 2001
From: emilylange <git@emilylange.de>
Date: Fri, 26 May 2023 19:43:58 +0200
Subject: [PATCH] nixos/qemu-vm: add `virtualisation.memorySize < 2048`
 assertion on 32bit

---
 nixos/modules/virtualisation/qemu-vm.nix | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix
index 5f6bf4b39e97..5dfc77cb428a 100644
--- a/nixos/modules/virtualisation/qemu-vm.nix
+++ b/nixos/modules/virtualisation/qemu-vm.nix
@@ -863,7 +863,13 @@ in
                   The address must be in the default VLAN (10.0.2.0/24).
               '';
           }
-        ]));
+        ])) ++ [
+          { assertion = pkgs.stdenv.hostPlatform.is32bit && cfg.memorySize < 2047;
+            message = ''
+              virtualisation.memorySize is above 2047, but qemu is only able to allocate 2047MB RAM on 32bit max.
+            '';
+          }
+        ];
 
     warnings =
       optional (