From 1c7b2798a1565d352329f1de31836d15f8af0e95 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Fri, 14 Mar 2025 20:03:20 +0100
Subject: [PATCH] Update boot.sh

---
 src/boot.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/boot.sh b/src/boot.sh
index a55db6f..ee62333 100644
--- a/src/boot.sh
+++ b/src/boot.sh
@@ -74,4 +74,29 @@ case "${BOOT_MODE,,}" in
     ;;
 esac
 
+MSRS="/sys/module/kvm/parameters/ignore_msrs"
+if [ -e "$MSRS" ]; then
+  result=$(<"$MSRS")
+  if [[ "$result" == "0" ]] || [[ "${result^^}" == "N" ]]; then
+    echo 1 | tee "$MSRS" > /dev/null 2>&1 || true
+  fi
+fi
+
+CLOCKSOURCE="tsc"
+[[ "${ARCH,,}" == "arm64" ]] && CLOCKSOURCE="arch_sys_counter"
+CLOCK="/sys/devices/system/clocksource/clocksource0/current_clocksource"
+
+if [ ! -f "$CLOCK" ]; then
+  warn "file \"$CLOCK\" cannot not found?"
+else
+  result=$(<"$CLOCK")
+  case "${result,,}" in
+    "${CLOCKSOURCE,,}" ) ;;
+    "kvm-clock" ) info "Nested KVM virtualization detected.." ;;
+    "hyperv_clocksource_tsc_page" ) info "Nested Hyper-V virtualization detected.." ;;
+    "hpet" ) warn "unsupported clock source detected: '$result'. Please set host clock source to '$CLOCKSOURCE'" ;;
+    *) warn "unexpected clock source detected: '$result'. Please set host clock source to '$CLOCKSOURCE'" ;;
+  esac
+fi
+
 return 0