HV: add get_sos_vm api

This patch creates a new get_sos_vm() api to replace get_vm_from_vmid(0U)
because VM 0 might not be SOS VM now;

Tracked-On: #2291

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: jsun26intel

hypervisor/arch/x86/guest/vm.c

@@ -73,6 +73,12 @@ struct acrn_vm *get_vm_from_vmid(uint16_t vm_id)
 	return &vm_array[vm_id];
 }
 
+/* return a pointer to the virtual machine structure of SOS VM */
+struct acrn_vm *get_sos_vm(void)
+{
+	return sos_vm_ptr;
+}
+
 /**
  * @pre vm_config != NULL
  */

hypervisor/common/io_req.c

@@ -15,14 +15,15 @@ static void fire_vhm_interrupt(void)
 	 * use vLAPIC to inject vector to SOS vcpu 0 if vlapic is enabled
 	 * otherwise, send IPI hardcoded to BOOT_CPU_ID
 	 */
-	struct acrn_vm *vm0;
+	struct acrn_vm *sos_vm;
 	struct acrn_vcpu *vcpu;
 
-	vm0 = get_vm_from_vmid(0U);
+	sos_vm = get_sos_vm();
+	if (sos_vm != NULL) {
+		vcpu = vcpu_from_vid(sos_vm, BOOT_CPU_ID);
 
-	vcpu = vcpu_from_vid(vm0, 0U);
-
-	vlapic_set_intr(vcpu, acrn_vhm_vector, LAPIC_TRIG_EDGE);
+		vlapic_set_intr(vcpu, acrn_vhm_vector, LAPIC_TRIG_EDGE);
+	}
 }
 
 #if defined(HV_DEBUG)

hypervisor/debug/vuart.c

@@ -376,7 +376,7 @@ struct acrn_vuart *vuart_console_active(void)
 
 	vm = get_vm_from_vmid(vuart_vmid);
 #else
-	struct acrn_vm *vm = get_vm_from_vmid(0U);
+	struct acrn_vm *vm = get_sos_vm();
 #endif
 
 	if (vm != NULL) {

hypervisor/dm/vpci/sharing_mode.c

@@ -228,7 +228,7 @@ void vpci_reset_ptdev_intr_info(const struct acrn_vm *target_vm, uint16_t vbdf,
 	} else {
 		/* Return this PCI device to SOS */
 		if (vdev->vpci->vm == target_vm) {
-			vm = get_vm_from_vmid(0U);
+			vm = get_sos_vm();
 
 			if (vm != NULL) {
 				vdev->vpci = &vm->vpci;

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

@@ -314,6 +314,7 @@ extern struct acrn_vm_config vm_configs[];
 bool is_sos_vm(const struct acrn_vm *vm);
 uint16_t find_free_vm_id(void);
 struct acrn_vm *get_vm_from_vmid(uint16_t vm_id);
+struct acrn_vm *get_sos_vm(void);
 
 #ifdef CONFIG_PARTITION_MODE
 struct vm_config_arraies {