From 3f2ca67051d4f343da46eb2ed2bc98e12c5d727b Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Sat, 16 Dec 2023 04:22:21 +0100
Subject: [PATCH] feat: Emulate SSE4.2 on ARM64

---
 src/config.sh | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/src/config.sh b/src/config.sh
index 9725628..6a09009 100644
--- a/src/config.sh
+++ b/src/config.sh
@@ -3,6 +3,7 @@ set -Eeuo pipefail
 
 KVM_ERR=""
 KVM_OPTS=""
+QEMU_CPU="qemu64,+ssse3,+sse4,+sse4.1,+sse4.2"
 
 if [ "$ARCH" == "amd64" ]; then
 
@@ -15,23 +16,27 @@ if [ "$ARCH" == "amd64" ]; then
   fi
 
   if [ -n "$KVM_ERR" ]; then
-    error "KVM acceleration not detected $KVM_ERR, see the FAQ about this."
-    [[ "$DEBUG" != [Yy1]* ]] && exit 88
+    error "KVM acceleration not detected $KVM_ERR, this will cause a major loss of performance."
+    error "See the FAQ on how to enable it, or skip this error by setting KVM=N (not recommended)."
+    [[ "$KVM" != [Nn]* ]] && [[ "$DEBUG" != [Yy1]* ]] && exit 88
+    [ "$CPU_MODEL" == "host" ] && CPU_MODEL="$QEMU_CPU"
   else
-    if [ "$CPU_MODEL" == "host" ]; then
-      if ! grep -qE '^flags.* (sse4_2)' /proc/cpuinfo; then
-        error "Your CPU does not have the SSE4.2 instruction set, which is required by DSM."
-        [[ "$DEBUG" != [Yy1]* ]] && exit 89
-      fi
-    fi
-    KVM_OPTS=",accel=kvm -enable-kvm -cpu $CPU_MODEL"
+    KVM_OPTS=",accel=kvm -enable-kvm"
   fi
 
+  if [ "$CPU_MODEL" == "host" ]; then
+    if ! grep -qE '^flags.* (sse4_2)' /proc/cpuinfo; then
+      info "Your CPU does not have the SSE4.2 instruction set, it will be emulated.."
+      CPU_MODEL="host,+ssse3,+sse4,+sse4.1,+sse4.2"
+    fi
+  fi
+else
+  [ "$CPU_MODEL" == "host" ] && CPU_MODEL="$QEMU_CPU"
 fi
 
 DEF_OPTS="-nographic -nodefaults -boot strict=on -display none"
 RAM_OPTS=$(echo "-m $RAM_SIZE" | sed 's/MB/M/g;s/GB/G/g;s/TB/T/g')
-CPU_OPTS="-smp $CPU_CORES,sockets=1,dies=1,cores=$CPU_CORES,threads=1"
+CPU_OPTS="-cpu $CPU_MODEL -smp $CPU_CORES,sockets=1,dies=1,cores=$CPU_CORES,threads=1"
 MAC_OPTS="-machine type=q35,usb=off,dump-guest-core=off,hpet=off${KVM_OPTS}"
 EXTRA_OPTS="-device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x4"
 EXTRA_OPTS="$EXTRA_OPTS -object rng-random,id=objrng0,filename=/dev/urandom"