debvm-run: skip kvm-specific options when kvm is unavailable

1 files changed, 5 insertions, 1 deletions

diff --git a/debvm-run b/debvm-run
index dd4667d..87fe0d6 100755
--- a/debvm-run
+++ b/debvm-run
@@ -88,7 +88,11 @@ set -- \
 
 if test "$ARCHITECTURE" = "$VMARCH"; then
 	QEMU=kvm
-	set -- -cpu host "$@"
+	# While kvm will fall back gracefully, the following options can only
+	# be passed when kvm really is available.
+	if test -w /dev/kvm; then
+		set -- -enable-kvm -cpu host "$@"
+	fi
 else
 	case "$VMARCH" in
 		arm64)