From 010a7093656ab7631cab83ed76abadddffcfb1a1 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Sun, 9 Jun 2024 13:06:00 +0200
Subject: [PATCH] feat: Verify clocksource is TSC

---
 src/proc.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/proc.sh b/src/proc.sh
index 08c61c6..68658c2 100644
--- a/src/proc.sh
+++ b/src/proc.sh
@@ -51,6 +51,7 @@ fi
 if [[ "$KVM" != [Nn]* ]]; then
 
   CPU_FEATURES="kvm=on,l3-cache=on,+hypervisor"
+  CLOCK="/sys/devices/system/clocksource/clocksource0/current_clocksource"
   KVM_OPTS=",accel=kvm -enable-kvm -global kvm-pit.lost_tick_policy=discard"
 
   if ! grep -qw "sse4_2" <<< "$flags"; then
@@ -64,6 +65,15 @@ if [[ "$KVM" != [Nn]* ]]; then
     CPU_FEATURES+=",migratable=no"
   fi
 
+  if [ -f "$CLOCK" ]; then
+    CLOCK=$(<"$CLOCK")
+    if [[ "${CLOCK,,}" != "tsc" ]]; then
+      warn "unexpected clocksource: $CLOCK"
+    fi
+  else
+    warn "file \"$CLOCK\" cannot not found?"
+  fi
+
   if grep -qw "svm" <<< "$flags"; then
 
     # AMD processor