20240721

.local/bin/vm

@@ -1,16 +1,13 @@
 #!/bin/bash -eu
 
-getmaxram() {
-    local ram; ram="$(free -g | awk '/^Mem:/{print $2 - 2}')"
-
-    if   [ "$ram" -le  2 ]; then  ram=2
-    elif [ "$ram" -gt 32 ]; then ram=32; fi
-    echo "${ram}G"
-}
-
 ISO="$1"; shift
 DISK="$HOME/${ISO%.*}.qcow2"
-MAXMEM="$(getmaxram)"
+RAM="$(free -g | awk '/^Mem:/{t=$2 / 2; print(t < 2 ? 2 : t)"G"}')"
+
+if ! [ -f "$ISO" ]; then
+    echo "$ISO does not exist" >&2
+    exit 1
+fi
 
 if ! [ -f "$DISK" ]; then (set -x
     qemu-img create -f qcow2 "$DISK" 64G
@@ -21,13 +18,13 @@ qemu-system-x86_64 \
     -M       q35 \
     -bios    /usr/share/edk2/x64/OVMF.4m.fd \
     -monitor stdio \
-    -cpu     host \
-    -m       "2G,maxmem=$MAXMEM" \
+    -smp     "$(nproc --ignore 4)" \
+    -m       "$RAM" \
     -vga     virtio \
     -audio   pipewire,model=hda \
     -nic     model=virtio-net-pci,type=user \
     -device  qemu-xhci \
-    -object  "memory-backend-ram,id=mem,size=2G,share=on" \
+    -object  "memory-backend-ram,id=mem,size=$RAM,share=on" \
     -numa    node,memdev=mem \
     -drive   "if=virtio,file=$DISK" \
     -drive   "file=$ISO,media=cdrom,readonly=on" \