HV: Add one hcall to set the upcall vector passed from sos_kernel

Currently the acrn-hypervisor is using the PLATFORM_IPI vector to notify
the sos_kernel. And then sos_kernel will handle the notification from acrn
hypervisor in PLATFORM_IPI ISR. But as the PLATFORM_IPI ISR can be registered
by the other modules, it will have the conflict when trying to register
acrn intr ISR. So the HYPERVISOR_CALLBACK_VECTOR will be used instead.

In order to switch the notification vector from PLATFORM_IPI to
HYPERVISOR_CALLBACK_VECTOR, one API is added so that sos can configure
the up-notifier interrrupt vector.

Tracked-On: #1325
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: yakuizhao

hypervisor/arch/x86/guest/vmcall.c

@@ -50,6 +50,11 @@ int vmcall_vmexit_handler(struct vcpu *vcpu)
 		ret = hcall_get_api_version(vm, param1);
 		break;
 
+	case HC_SET_CALLBACK_VECTOR:
+		ret = hcall_set_callback_vector(vm, param1);
+
+		break;
+
 	case HC_CREATE_VM:
 		ret = hcall_create_vm(vm, param1);
 		break;

hypervisor/common/hypercall.c

@@ -1036,3 +1036,23 @@ int32_t hcall_vm_intr_monitor(struct vm *vm, uint16_t vmid, uint64_t param)
 
 	return 0;
 }
+
+/**
+ *@pre Pointer vm shall point to VM0
+ */
+int32_t hcall_set_callback_vector(struct vm *vm, uint64_t param)
+{
+	if (!is_vm0(vm)) {
+		pr_err("%s: Targeting to service vm", __func__);
+		return -EPERM;
+	}
+
+	if ((param > NR_MAX_VECTOR) || (param < VECTOR_DYNAMIC_START)) {
+		pr_err("%s: Invalid passed vector\n");
+		return -EINVAL;
+	}
+
+	acrn_vhm_vector = param;
+
+	return 0;
+}

hypervisor/include/common/hypercall.h

@@ -455,6 +455,21 @@ int64_t hcall_save_restore_sworld_ctx(struct vcpu *vcpu);
  * @}
  */ // End of trusty_hypercall
 
+/**
+ * @brief set upcall notifier vector
+ *
+ * This is the API that helps to switch the notifer vecotr. If this API is
+ * not called, the hypervisor will use the default notifier vector(0xF7)
+ * to notify the SOS kernel.
+ *
+ * @param vm Pointer to VM data structure
+ * @param the expected notifier vector from guest
+ *
+ * @pre Pointer vm shall point to VM0
+ * @return 0 on success, non-zero on error.
+ */
+int32_t hcall_set_callback_vector(struct vm *vm, uint64_t param);
+
 /**
  * @}
  */ // End of acrn_hypercall

hypervisor/include/public/acrn_hv_defs.h

@@ -27,6 +27,7 @@
 #define HC_ID_GEN_BASE               0x0UL
 #define HC_GET_API_VERSION          BASE_HC_ID(HC_ID, HC_ID_GEN_BASE + 0x00UL)
 #define HC_SOS_OFFLINE_CPU          BASE_HC_ID(HC_ID, HC_ID_GEN_BASE + 0x01UL)
+#define HC_SET_CALLBACK_VECTOR      BASE_HC_ID(HC_ID, HC_ID_GEN_BASE + 0x02UL)
 
 /* VM management */
 #define HC_ID_VM_BASE               0x10UL