vmm: cpu: Set CPU physical bits based on user input

If the user specified a maximum physical bits value through the
`max_phys_bits` option from `--cpus` parameter, the guest CPUID
will be patched accordingly to ensure the guest will find the
right amount of physical bits.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

vmm/src/vm.rs

@@ -433,7 +433,7 @@ impl VmmOps for VmOps {
     }
 }
 
-fn physical_bits(max_phys_bits: Option<u8>) -> u8 {
+pub fn physical_bits(max_phys_bits: Option<u8>) -> u8 {
     let host_phys_bits = get_host_cpu_phys_bits();
     cmp::min(host_phys_bits, max_phys_bits.unwrap_or(host_phys_bits))
 }