test

IO-Exit.patch

@@ -0,0 +1,13 @@
+diff --git a/hw/misc/debugexit.c b/hw/misc/debugexit.c
+index ab6de69ce7..b309a36e17 100644
+--- a/hw/misc/debugexit.c
++++ b/hw/misc/debugexit.c
+@@ -32,7 +32,7 @@ static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size)
+ static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
+                              unsigned width)
+ {
+-    exit((val << 1) | 1);
++    exit(val);
+ }
+
+ static const MemoryRegionOps debug_exit_ops = {

overlay.nix

@@ -0,0 +1,7 @@
+    final: prev: {
+        patched-qemu = prev.qemu.overrideAttrs (previousAttrs: {
+            patches = previousAttrs.patches ++ [
+            ./IO-Exit.patch
+            ];
+        });
+    }

release.nix

@@ -1,6 +1,7 @@
 { ... }:
 let
-    pkgs = (import <nixpkgs> {});
+    my_overlay = import ./overlay.nix
+    pkgs = import <nixpkgs> { overlay [ my_overlay ]; };
 in {
     qemu = pkgs.qemu;
 }