From 71631a922b4005497fe3b93fdfe5899e2f6d7a2c Mon Sep 17 00:00:00 2001
From: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Date: Wed, 6 Dec 2017 20:26:22 +0200
Subject: runInLinuxVM: Use QEMU command line that works on other architectures

... by moving the existing definition to qemu-flags.nix and reusing
that.
---
 nixos/lib/qemu-flags.nix                 | 6 ++++++
 nixos/modules/virtualisation/qemu-vm.nix | 8 +-------
 pkgs/build-support/vm/default.nix        | 5 +----
 3 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/nixos/lib/qemu-flags.nix b/nixos/lib/qemu-flags.nix
index fb00c3183fbf..fcdcbf1b0077 100644
--- a/nixos/lib/qemu-flags.nix
+++ b/nixos/lib/qemu-flags.nix
@@ -12,4 +12,10 @@
         else if pkgs.stdenv.isArm || pkgs.stdenv.isAarch64 then "ttyAMA0"
         else throw "Unknown QEMU serial device for system '${pkgs.stdenv.system}'";
 
+  qemuBinary = qemuPkg: {
+    "i686-linux" = "${qemuPkg}/bin/qemu-kvm";
+    "x86_64-linux" = "${qemuPkg}/bin/qemu-kvm -cpu kvm64";
+    "armv7l-linux" = "${qemuPkg}/bin/qemu-system-arm -enable-kvm -machine virt -cpu host";
+    "aarch64-linux" = "${qemuPkg}/bin/qemu-system-aarch64 -enable-kvm -machine virt,gic-version=host -cpu host";
+  }.${pkgs.stdenv.system} or (throw "Unknown QEMU binary for '${pkgs.stdenv.system}'");
 }
diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix
index c52f637604ae..13d0eb7de5c2 100644
--- a/nixos/modules/virtualisation/qemu-vm.nix
+++ b/nixos/modules/virtualisation/qemu-vm.nix
@@ -15,12 +15,6 @@ with import ../../lib/qemu-flags.nix { inherit pkgs; };
 let
 
   qemu = config.system.build.qemu or pkgs.qemu_test;
-  qemuKvm = {
-    "i686-linux" = "${qemu}/bin/qemu-kvm";
-    "x86_64-linux" = "${qemu}/bin/qemu-kvm -cpu kvm64";
-    "armv7l-linux" = "${qemu}/bin/qemu-system-arm -enable-kvm -machine virt -cpu host";
-    "aarch64-linux" = "${qemu}/bin/qemu-system-aarch64 -enable-kvm -machine virt,gic-version=host -cpu host";
-  }.${pkgs.stdenv.system};
 
   vmName =
     if config.networking.hostName == ""
@@ -79,7 +73,7 @@ let
       '')}
 
       # Start QEMU.
-      exec ${qemuKvm} \
+      exec ${qemuBinary qemu} \
           -name ${vmName} \
           -m ${toString config.virtualisation.memorySize} \
           -smp ${toString config.virtualisation.cores} \
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index cf6e7cc1fe4e..d599f9bbb65f 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -23,8 +23,6 @@ rec {
     patches = [ ../../../nixos/modules/virtualisation/azure-qemu-220-no-etc-install.patch ];
   });
 
-  qemuProg = "${qemu}/bin/qemu-kvm";
-
 
   modulesClosure = makeModulesClosure {
     inherit kernel rootModules;
@@ -204,8 +202,7 @@ rec {
 
 
   qemuCommandLinux = ''
-    ${qemuProg} \
-      ${lib.optionalString (pkgs.stdenv.system == "x86_64-linux") "-cpu kvm64"} \
+    ${qemuBinary qemu} \
       -nographic -no-reboot \
       -device virtio-rng-pci \
       -virtfs local,path=${storeDir},security_model=none,mount_tag=store \
-- 
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