HV: add hypercall interface of get vcpu state data

We can use this interface for VHM to pass per-cpu power state data
to guest per its request.

For now the vcpu power state is per-vm, this could be changed if
per-cpu power state support is required in the future.

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

include/public/acrn_common.h

@@ -301,6 +301,26 @@ struct cpu_px_data {
 	uint64_t status;		/* success indicator */
 } __attribute__((aligned(8)));
 
+/**
+ * @brief Info PM command from DM/VHM.
+ *
+ * The command would specify request type(i.e. get px count or data) for
+ * specific VM and specific VCPU with specific state number.like P(n).
+ */
+#define PMCMD_VMID_MASK		0xff000000
+#define PMCMD_VCPUID_MASK	0x00ff0000
+#define PMCMD_STATE_NUM_MASK	0x0000ff00
+#define PMCMD_TYPE_MASK		0x000000ff
+
+#define PMCMD_VMID_SHIFT	24
+#define PMCMD_VCPUID_SHIFT	16
+#define PMCMD_STATE_NUM_SHIFT	8
+
+enum pm_cmd_type {
+	PMCMD_GET_PX_CNT,
+	PMCMD_GET_PX_DATA,
+};
+
 /**
  * @}
  */