HV: refine reset_vcpu api

The patch abstract a vcpu_reset_internal() api for internal usage, the
function would not touch any vcpu state transition and just do vcpu reset
processing. It will be called by create_vcpu() and reset_vcpu().

The reset_vcpu() will act as a public api and should be called
only when vcpu receive INIT or vm reset/resume from S3. It should not be
called when do shutdown_vm() or hcall_sos_offline_cpu(), so the patch remove
reset_vcpu() in shutdown_vm() and hcall_sos_offline_cpu().

The patch also introduced reset_mode enum so that vcpu and vlapic could do
different context operation according to different reset mode;

Tracked-On: #4267

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

hypervisor/include/arch/x86/guest/vcpu.h

@@ -146,6 +146,7 @@ enum vm_cpu_mode {
 	CPU_MODE_64BIT,			/* IA-32E mode (CS.L = 1) */
 };
 
+enum reset_mode;
 
 /* 2 worlds: 0 for Normal World, 1 for Secure World */
 #define NR_WORLD	2
@@ -600,10 +601,11 @@ void offline_vcpu(struct acrn_vcpu *vcpu);
  * Reset all fields in a vCPU instance, the vCPU state is reset to VCPU_INIT.
  *
  * @param[inout] vcpu pointer to vcpu data structure
+ * @param[in] mode the reset mode
  *
  * @return None
  */
-void reset_vcpu(struct acrn_vcpu *vcpu);
+void reset_vcpu(struct acrn_vcpu *vcpu, enum reset_mode mode);
 
 /**
  * @brief pause the vcpu and set new state

hypervisor/include/arch/x86/guest/vm.h

@@ -30,6 +30,14 @@
 #include <hyperv.h>
 #endif
 
+enum reset_mode {
+	POWER_ON_RESET,		/* reset by hardware Power-on */
+	COLD_RESET,		/* hardware cold reset */
+	WARM_RESET,		/* behavior slightly differ from cold reset, that some MSRs might be retained. */
+	INIT_RESET,		/* reset by INIT */
+	SOFTWARE_RESET,		/* reset by software disable<->enable */
+};
+
 struct vm_hw_info {
 	/* vcpu array of this VM */
 	struct acrn_vcpu vcpu_array[MAX_VCPUS_PER_VM];