hv: add hypercall to set vcpu init state

DM will use this hypercall to initialize the UOS BSP state.

Tracked-On: #1231
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: fyin1

hypervisor/arch/x86/guest/vmcall.c

@@ -78,6 +78,11 @@ int vmcall_vmexit_handler(struct vcpu *vcpu)
 		ret = hcall_create_vcpu(vm, (uint16_t)param1, param2);
 		break;
 
+	case HC_SET_VCPU_REGS:
+		/* param1: vmid */
+		ret = hcall_set_vcpu_regs(vm, (uint16_t)param1, param2);
+		break;
+
 	case HC_ASSERT_IRQLINE:
 		/* param1: vmid */
 		ret = hcall_assert_irqline(vm, (uint16_t)param1, param2);

hypervisor/common/hypercall.c

@@ -297,6 +297,40 @@ int32_t hcall_pulse_irqline(struct vm *vm, uint16_t vmid, uint64_t param)
 	return ret;
 }
 
+/**
+ *@pre Pointer vm shall point to VM0
+ */
+int32_t hcall_set_vcpu_regs(struct vm *vm, uint16_t vmid, uint64_t param)
+{
+	struct vm *target_vm = get_vm_from_vmid(vmid);
+	struct acrn_set_vcpu_regs vcpu_regs;
+	struct vcpu *vcpu;
+
+	if ((target_vm == NULL) || (param == 0U) || is_vm0(target_vm)) {
+		return -1;
+	}
+
+	/* Only allow setup init ctx while target_vm is inactive */
+	if (target_vm->state == VM_STARTED) {
+		return -1;
+	}
+
+	if (copy_from_gpa(vm, &vcpu_regs, param, sizeof(vcpu_regs)) != 0) {
+		pr_err("%s: Unable copy param to vm\n", __func__);
+		return -1;
+	}
+
+	vcpu = vcpu_from_vid(target_vm, vcpu_regs.vcpu_id);
+	if (vcpu == NULL) {
+		pr_err("%s: invalid vcpu_id for set_vcpu_regs\n", __func__);
+		return -1;
+	}
+
+	set_vcpu_regs(vcpu, &(vcpu_regs.vcpu_regs));
+
+	return 0;
+}
+
 /**
  *@pre Pointer vm shall point to VM0
  */

hypervisor/include/common/hypercall.h

@@ -136,6 +136,22 @@ int32_t hcall_pause_vm(uint16_t vmid);
  */
 int32_t hcall_create_vcpu(struct vm *vm, uint16_t vmid, uint64_t param);
 
+/**
+ * @brief set vcpu regs
+ *
+ * Set the vcpu regs. It will set the vcpu init regs from DM. Now,
+ * it's only applied to BSP. AP always uses fixed init regs.
+ * The function will return -1 if the targat VM or BSP doesn't exist.
+ *
+ * @param vm Pointer to VM data structure
+ * @param vmid ID of the VM
+ * @param param guest physical address. This gpa points to
+ *              struct acrn_vcpu_regs
+ *
+ * @return 0 on success, non-zero on error.
+ */
+int32_t hcall_set_vcpu_regs(struct vm *vm, uint16_t vmid, uint64_t param);
+
 /**
  * @brief assert IRQ line
  *

hypervisor/include/public/acrn_common.h

@@ -310,6 +310,22 @@ struct acrn_vcpu_regs {
 	uint16_t        reserved_16[4];
 };
 
+/**
+ * @brief Info to set vcpu state
+ *
+ * the pamameter for HC_SET_VCPU_STATE
+ */
+struct acrn_set_vcpu_regs {
+	/** the virtual CPU ID for the VCPU to set state */
+	uint16_t vcpu_id;
+
+	/** reserved space to make cpu_state aligned to 8 bytes */
+	uint16_t reserved0[3];
+
+	/** the structure to hold vcpu state */
+	struct acrn_vcpu_regs vcpu_regs;
+} __attribute__((aligned(8)));
+
 /**
  * @brief Info to set ioreq buffer for a created VM
  *

hypervisor/include/public/acrn_hv_defs.h

@@ -37,6 +37,7 @@
 #define HC_PAUSE_VM                 BASE_HC_ID(HC_ID, HC_ID_VM_BASE + 0x03UL)
 #define HC_CREATE_VCPU              BASE_HC_ID(HC_ID, HC_ID_VM_BASE + 0x04UL)
 #define HC_RESET_VM                 BASE_HC_ID(HC_ID, HC_ID_VM_BASE + 0x05UL)
+#define HC_SET_VCPU_REGS            BASE_HC_ID(HC_ID, HC_ID_VM_BASE + 0x06UL)
 
 /* IRQ and Interrupts */
 #define HC_ID_IRQ_BASE              0x20UL