contest: vm: support setting memory size

Add first class citizen setting for memory size, since we have
one for CPU count. Like QEMU and vng the memory size is in MB.

Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

contest/remote/lib/vm.py

@@ -179,6 +179,9 @@ def start(self, cwd=None):
         cpus = self.config.get('vm', 'cpus', fallback="")
         if cpus:
             cmd += ["--cpus", cpus]
+        mem = self.config.get('vm', 'mem', fallback="")
+        if mem:
+            cmd += ["--memory", mem]
 
         print(f"INFO{self.print_pfx} VM starting:", " ".join(cmd))
         self.log_out += "# " + " ".join(cmd) + "\n"