From 34020614e13600af04f88d0b674ca4f53f419332 Mon Sep 17 00:00:00 2001
From: Roey Darwish Dror <roey.ghost@gmail.com>
Date: Sun, 11 Aug 2019 15:46:19 +0300
Subject: [PATCH] Enable KVM only if available

---
 src/main.rs | 50 ++++++++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 24 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index a5894a4..5130514 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -421,30 +421,32 @@ fn chroot(command: ChrootCommand) -> Result<(), Error> {
 fn qemu(command: QemuCommand) -> Result<(), Error> {
     let qemu = Tool::find("qemu-system-x86_64")?;
 
-    let err = qemu
-        .execute()
-        .args(&[
-            "-enable-kvm",
-            "-cpu",
-            "host",
-            "-m",
-            "4G",
-            "-netdev",
-            "user,id=user.0",
-            "-device",
-            "virtio-net-pci,netdev=user.0",
-            "-device",
-            "qemu-xhci,id=xhci",
-            "-device",
-            "usb-tablet,bus=xhci.0",
-            "-drive",
-        ])
-        .arg(format!(
-            "file={},if=virtio,format=raw",
-            command.block_device.display()
-        ))
-        .args(command.args)
-        .exec();
+    let mut run = qemu.execute();
+    run.args(&[
+        "-m",
+        "4G",
+        "-netdev",
+        "user,id=user.0",
+        "-device",
+        "virtio-net-pci,netdev=user.0",
+        "-device",
+        "qemu-xhci,id=xhci",
+        "-device",
+        "usb-tablet,bus=xhci.0",
+        "-drive",
+    ])
+    .arg(format!(
+        "file={},if=virtio,format=raw",
+        command.block_device.display()
+    ))
+    .args(command.args);
+
+    if PathBuf::from("/dev/kvm").exists() {
+        debug!("KVM is enabled");
+        run.args(&["-enable-kvm", "-cpu", "host"]);
+    }
+
+    let err = run.exec();
 
     Err(err).context(ErrorKind::Qemu)?
 }