hypervisor, vmm: Limit max number of vCPUs to hypervisor maximum

On KVM this is provided by an ioctl, on MSHV this is constant. Although
there is a HV_MAXIMUM_PROCESSORS constant the MSHV ioctl API is limited
to u8.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

hypervisor/src/kvm/mod.rs

@@ -1084,6 +1084,11 @@ impl hypervisor::Hypervisor for KvmHypervisor {
             self.kvm.get_guest_debug_hw_bps() as usize
         }
     }
+
+    /// Get maximum number of vCPUs
+    fn get_max_vcpus(&self) -> u32 {
+        self.kvm.get_max_vcpus().min(u32::MAX as usize) as u32
+    }
 }
 /// Vcpu struct for KVM
 pub struct KvmVcpu {