add hypercall hc_sos_offline_cpu support

SOS boot with all physicall cpus, before running UOS, it should free
CPU resource by offline not used cpus
- first do standard cpu offline flow
- then call hcall_sos_offline_cpu hypercall to release cpu resource really

Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/common/hypercall.h

@@ -24,6 +24,18 @@ bool is_hypercall_from_ring0(void);
  * @{
  */
 
+/**
+ * @brief offline vcpu from SOS
+ *
+ * The function offline specific vcpu from SOS.
+ *
+ * @param vm Pointer to VM data structure
+ * @param lapicid lapic id of the vcpu which wants to offline
+ *
+ * @return 0 on success, non-zero on error.
+ */
+int32_t hcall_sos_offline_cpu(struct vm *vm, uint64_t lapicid);
+
 /**
  * @brief Get hypervisor api version
  *