From 8de7f56ff8d1710c5431adf5d14177e51e8f62e0 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Tue, 23 Sep 2025 16:02:42 +0200
Subject: [PATCH] feat: Add KVM warning (#1021)

---
 src/proc.sh | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/proc.sh b/src/proc.sh
index a5f5c1b..5e3f69d 100644
--- a/src/proc.sh
+++ b/src/proc.sh
@@ -7,7 +7,6 @@ set -Eeuo pipefail
 : "${HOST_CPU:=""}"
 : "${CPU_FLAGS:=""}"
 : "${CPU_MODEL:=""}"
-: "${DEF_MODEL:="qemu64"}"
 
 CLOCKSOURCE="tsc"
 [[ "${ARCH,,}" == "arm64" ]] && CLOCKSOURCE="arch_sys_counter"
@@ -27,9 +26,13 @@ else
   esac
 fi
 
-if [[ "${ARCH,,}" != "amd64" ]]; then
-  KVM="N"
-  warn "your CPU architecture is ${ARCH^^} and cannot provide KVM acceleration for x64 instructions, this will cause a major loss of performance."
+if [[ "$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 [[ "$KVM" != [Nn]* ]]; then
@@ -52,8 +55,8 @@ if [[ "$KVM" != [Nn]* ]]; then
   if [ -n "$KVM_ERR" ]; then
     KVM="N"
     if [[ "$OSTYPE" =~ ^darwin ]]; then
-      warn "you are using macOS which has no KVM support, this will cause a major loss of performance."
-    else      
+      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"* )
@@ -61,7 +64,7 @@ if [[ "$KVM" != [Nn]* ]]; then
         *"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 a major loss of performance."
+          error "KVM acceleration is not available $KVM_ERR, this will cause the machine to run about 10 times slower."
           error "See the FAQ for possible causes, or continue without it by adding KVM: \"N\" (not recommended)." ;;
       esac
       [[ "$DEBUG" != [Yy1]* ]] && exit 88
@@ -120,7 +123,7 @@ else
       CPU_MODEL="max"
       CPU_FEATURES+=",migratable=no"
     else
-      CPU_MODEL="$DEF_MODEL"
+      CPU_MODEL="qemu64"
     fi
   fi