From 755182d9f38b23ff8e13dbcb81f52c3f51aaeebc Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Wed, 8 Oct 2025 13:37:53 +0200
Subject: [PATCH] Implement KVM support validation in reset.sh

Add KVM support checks and error handling
---
 src/reset.sh | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/src/reset.sh b/src/reset.sh
index dacab64..2016317 100644
--- a/src/reset.sh
+++ b/src/reset.sh
@@ -141,6 +141,55 @@ if [[ "$RAM_CHECK" != [Nn]* ]] && (( (RAM_WANTED + RAM_SPARE) > RAM_AVAIL )); th
   info "$msg"
 fi
 
+# Check KVM support
+
+if [[ "$KVM" == [Nn]* ]]; then
+  warn "KVM acceleration is disabled, this will cause the machine to run about 10 times slower!"
+else
+  if [[ "${ARCH,,}" != "amd64" ]]; then
+    KVM="N"
+    warn "your CPU architecture is ${ARCH^^} and cannot provide KVM acceleration for x64 instructions, so the machine will run about 10 times slower."
+  fi
+fi
+
+if [[ "$KVM" != [Nn]* ]]; then
+
+  KVM_ERR=""
+
+  if [ ! -e /dev/kvm ]; then
+    KVM_ERR="(/dev/kvm is missing)"
+  else
+    if ! sh -c 'echo -n > /dev/kvm' &> /dev/null; then
+      KVM_ERR="(/dev/kvm is unwriteable)"
+    else
+      flags=$(sed -ne '/^flags/s/^.*: //p' /proc/cpuinfo)
+      if ! grep -qw "vmx\|svm" <<< "$flags"; then
+        KVM_ERR="(not enabled in BIOS)"
+      fi
+    fi
+  fi
+
+  if [ -n "$KVM_ERR" ]; then
+    KVM="N"
+    if [[ "$OSTYPE" =~ ^darwin ]]; then
+      warn "you are using macOS which has no KVM support, so the machine will run about 10 times slower."
+    else
+      kernel=$(uname -a)
+      case "${kernel,,}" in
+        *"microsoft"* )
+          error "Please bind '/dev/kvm' as a volume in the optional container settings when using Docker Desktop." ;;
+        *"synology"* )
+          error "Please make sure that Synology VMM (Virtual Machine Manager) is installed and that '/dev/kvm' is binded to this container." ;;
+        *)
+          error "KVM acceleration is not available $KVM_ERR, this will cause the machine to run about 10 times slower."
+          error "See the FAQ for possible causes, or disable acceleration by adding the \"KVM=N\" variable (not recommended)." ;;
+      esac
+      [[ "$DEBUG" != [Yy1]* ]] && exit 88
+    fi
+  fi
+
+fi
+
 # Cleanup files
 rm -f /run/shm/qemu.*
 rm -f /run/shm/dsm.url
@@ -149,6 +198,7 @@ rm -f /run/shm/dsm.url
 rm -rf /tmp/dsm
 rm -rf "$STORAGE/tmp"
 
+
 : "${COM_PORT:="2210"}"    # Comm port
 : "${MON_PORT:="7100"}"    # Monitor port
 : "${WEB_PORT:="5000"}"    # Webserver port