[PATCH] smt: Fix check to detect if a system is running virtually

[Michael Tremer <michael.tremer@ipfire.org>]

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/sys/hypervisor exists when a host has loaded the kvm modules.

Fixes: #12472
Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
---
 src/initscripts/system/functions | 5 +++++
 src/initscripts/system/smt       | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/initscripts/system/functions b/src/initscripts/system/functions
index 30119918c..234b798cf 100644
--- a/src/initscripts/system/functions
+++ b/src/initscripts/system/functions
@@ -784,6 +784,11 @@ umount_ramdisk() {
 	rm -rf "${path_tmpfs}"
 }
 
+# Returns true when this system running in a virtual environment
+running_on_hypervisor() {
+	grep -qE "^flags\s+:.*hypervisor" /proc/cpuinfo
+}
+
 # https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/identify_ec2_instances.html
 running_on_ec2() {
 	local uuid
diff --git a/src/initscripts/system/smt b/src/initscripts/system/smt
index bfa7d57b3..274ec4bba 100644
--- a/src/initscripts/system/smt
+++ b/src/initscripts/system/smt
@@ -21,7 +21,7 @@ case "${1}" in
 		fi 2>/dev/null
 
 		# Do not disable SMT inside virtual machines
-		if [ -d "/sys/hypervisor" ]; then
+		if running_on_hypervisor; then
 			exit 0
 		fi
 
-- 
2.12.2