/*
 * Copyright (C) 2018 Intel Corporation. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <vm.h>
#include <vmx.h>
#include <schedule.h>
#include <version.h>
#include <reloc.h>
#include <vtd.h>
#include <per_cpu.h>
#include <lapic.h>
#include <assign.h>
#include <ept.h>
#include <mmu.h>
#include <hypercall.h>
#include <errno.h>
#include <logmsg.h>

#define ACRN_DBG_HYCALL	6U

bool is_hypercall_from_ring0(void)
{
	uint16_t cs_sel;
	bool ret;

	cs_sel = exec_vmread16(VMX_GUEST_CS_SEL);
	/* cs_selector[1:0] is CPL */
	if ((cs_sel & 0x3U) == 0U) {
	        ret = true;
	} else {
		ret = false;
	}

	return ret;
}

/**
 * @brief offline vcpu from SOS
 *
 * The function offline specific vcpu from SOS.
 *
 * @param vm Pointer to VM data structure
 * @param lapicid lapic id of the vcpu which wants to offline
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_sos_offline_cpu(struct acrn_vm *vm, uint64_t lapicid)
{
	struct acrn_vcpu *vcpu;
	uint16_t i;
	int32_t ret = 0;

	pr_info("sos offline cpu with lapicid %ld", lapicid);

	foreach_vcpu(i, vm, vcpu) {
		if (vlapic_get_apicid(vcpu_vlapic(vcpu)) == lapicid) {
			/* should not offline BSP */
			if (vcpu->vcpu_id == BOOT_CPU_ID) {
				ret = -1;
				break;
			}
			pause_vcpu(vcpu, VCPU_ZOMBIE);
			reset_vcpu(vcpu);
			offline_vcpu(vcpu);
		}
	}

	return ret;
}

/**
 * @brief Get hypervisor api version
 *
 * The function only return api version information when VM is SOS_VM.
 *
 * @param vm Pointer to VM data structure
 * @param param guest physical memory address. The api version returned
 *              will be copied to this gpa
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_get_api_version(struct acrn_vm *vm, uint64_t param)
{
	struct hc_api_version version;

	version.major_version = HV_API_MAJOR_VERSION;
	version.minor_version = HV_API_MINOR_VERSION;
	int32_t ret;

	if (copy_to_gpa(vm, &version, param, sizeof(version)) != 0) {
		pr_err("%s: Unable copy param to vm\n", __func__);
		ret = -1;
	} else {
		ret = 0;
	}

	return ret;
}

/**
 * @brief Get basic platform information.
 *
 * The function returns basic hardware or configuration information
 * for the current platform.
 *
 * @param vm Pointer to VM data structure.
 * @param param GPA pointer to struct hc_platform_info.
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, -1 in case of error.
 */
int32_t hcall_get_platform_info(struct acrn_vm *vm, uint64_t param)
{
	int32_t ret = 0;
	struct hc_platform_info platform_info;

	platform_info.cpu_num = get_pcpu_nums();
	platform_info.max_vcpus_per_vm = CONFIG_MAX_VCPUS_PER_VM;
	platform_info.max_kata_containers = CONFIG_MAX_KATA_VM_NUM;
	if (copy_to_gpa(vm, &platform_info, param, sizeof(platform_info)) != 0) {
		pr_err("%s: Unable copy param to vm\n", __func__);
		ret = -1;
	}

	return ret;
}

/**
 * @brief create virtual machine
 *
 * Create a virtual machine based on parameter, currently there is no
 * limitation for calling times of this function, will add MAX_VM_NUM
 * support later.
 *
 * @param vm Pointer to VM data structure
 * @param param guest physical memory address. This gpa points to
 *              struct acrn_create_vm
 *
 * @pre Pointer vm shall point to SOS_VM, vm_config != NULL
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_create_vm(struct acrn_vm *vm, uint64_t param)
{
	uint16_t vm_id;
	int32_t ret = -1;
	struct acrn_vm *target_vm = NULL;
	struct acrn_create_vm cv;
	struct acrn_vm_config* vm_config = NULL;

	if (copy_from_gpa(vm, &cv, param, sizeof(cv)) == 0) {
		vm_id = get_vmid_by_uuid(&cv.uuid[0]);
		if ((vm_id > vm->vm_id) && (vm_id < CONFIG_MAX_VM_NUM)
			&& (is_poweroff_vm(get_vm_from_vmid(vm_id)))) {
			vm_config = get_vm_config(vm_id);

			/* Filter out the bits should not set by DM and then assign it to guest_flags */
			vm_config->guest_flags |= (cv.vm_flag & DM_OWNED_GUEST_FLAG_MASK);

			/* GUEST_FLAG_RT must be set if we have GUEST_FLAG_LAPIC_PASSTHROUGH set in guest_flags */
			if (((vm_config->guest_flags & GUEST_FLAG_LAPIC_PASSTHROUGH) != 0U)
				&& ((vm_config->guest_flags & GUEST_FLAG_RT) == 0U)) {
				pr_err("Wrong guest flags 0x%lx\n", vm_config->guest_flags);
				ret = -1;
			} else {
				ret = create_vm(vm_id, vm_config, &target_vm);
				if (ret != 0) {
					dev_dbg(ACRN_DBG_HYCALL, "HCALL: Create VM failed");
					cv.vmid = ACRN_INVALID_VMID;
					ret = -1;
				} else {
					/* return a relative vm_id from SOS view */
					cv.vmid = vmid_2_rel_vmid(vm->vm_id, vm_id);
					cv.vcpu_num = vm_config->vcpu_num;
					ret = 0;
				}

				if (copy_to_gpa(vm, &cv, param, sizeof(cv)) != 0) {
					pr_err("%s: Unable copy param to vm\n", __func__);
					ret = -1;
				}
			}
		}
	} else {
		pr_err("%s: Unable copy param to vm\n", __func__);
	        ret = -1;
	}

	return ret;
}

/**
 * @brief destroy virtual machine
 *
 * Destroy a virtual machine, it will pause target VM then shutdown it.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vmid ID of the VM
 *
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_destroy_vm(uint16_t vmid)
{
	int32_t ret = -1;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		/* TODO: check target_vm guest_flags */
		ret = shutdown_vm(target_vm);
	}

	return ret;
}

/**
 * @brief start virtual machine
 *
 * Start a virtual machine, it will schedule target VM's vcpu to run.
 * The function will return -1 if the target VM does not exist or the
 * IOReq buffer page for the VM is not ready.
 *
 * @param vmid ID of the VM
 *
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_start_vm(uint16_t vmid)
{
	int32_t ret = -1;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if ((is_created_vm(target_vm)) && (is_postlaunched_vm(target_vm)) && (target_vm->sw.io_shared_page != NULL)) {
		/* TODO: check target_vm guest_flags */
		start_vm(target_vm);
		ret = 0;
	}

	return ret;
}

/**
 * @brief pause virtual machine
 *
 * Pause a virtual machine, if the VM is already paused, the function
 * will return 0 directly for success.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vmid ID of the VM
 *
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_pause_vm(uint16_t vmid)
{
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	int32_t ret = -1;

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		/* TODO: check target_vm guest_flags */
		pause_vm(target_vm);
		ret = 0;
	}

	return ret;
}

/**
 * @brief reset virtual machine
 *
 * Reset a virtual machine, it will make target VM rerun from
 * pre-defined entry. Comparing to start vm, this function reset
 * each vcpu state and do some initialization for guest.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vmid ID of the VM
 *
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_reset_vm(uint16_t vmid)
{
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	int32_t ret = -1;

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		/* TODO: check target_vm guest_flags */
	        ret = reset_vm(target_vm);
	}
	return ret;
}

/**
 * @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
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_vcpu_regs(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	struct acrn_set_vcpu_regs vcpu_regs;
	struct acrn_vcpu *vcpu;
	int32_t ret = -1;

	/* Only allow setup init ctx while target_vm is inactive */
	if ((!is_poweroff_vm(target_vm)) && (param != 0U) && (is_postlaunched_vm(target_vm)) &&
			(target_vm->state != VM_STARTED)) {
		if (copy_from_gpa(vm, &vcpu_regs, param, sizeof(vcpu_regs)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else if (vcpu_regs.vcpu_id >= CONFIG_MAX_VCPUS_PER_VM) {
			pr_err("%s: invalid vcpu_id for set_vcpu_regs\n", __func__);
		} else {
			vcpu = vcpu_from_vid(target_vm, vcpu_regs.vcpu_id);
			if (vcpu->state != VCPU_OFFLINE) {
				set_vcpu_regs(vcpu, &(vcpu_regs.vcpu_regs));
				ret = 0;
			}
		}
	}

	return ret;
}

/**
 * @brief set or clear IRQ line
 *
 * Set or clear a virtual IRQ line for a VM, which could be from ISA
 * or IOAPIC, normally it triggers an edge IRQ.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param ops request command for IRQ set or clear
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_irqline(const struct acrn_vm *vm, uint16_t vmid,
				const struct acrn_irqline_ops *ops)
{
	uint32_t irq_pic;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	int32_t ret = -1;

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		if (ops->gsi < vioapic_pincount(vm)) {
			if (ops->gsi < vpic_pincount()) {
				/*
				 * IRQ line for 8254 timer is connected to
				 * I/O APIC pin #2 but PIC pin #0,route GSI
				 * number #2 to PIC IRQ #0.
				 */
				irq_pic = (ops->gsi == 2U) ? 0U : ops->gsi;
				vpic_set_irqline(vm_pic(target_vm), irq_pic, ops->op);
		        }

			/* handle IOAPIC irqline */
			vioapic_set_irqline_lock(target_vm, ops->gsi, ops->op);
			ret = 0;
		}
	}

	return ret;
}

/**
 *@pre Pointer vm shall point to SOS_VM
 */
static void inject_msi_lapic_pt(struct acrn_vm *vm, const struct acrn_msi_entry *vmsi)
{
	union apic_icr icr;
	struct acrn_vcpu *vcpu;
	union msi_addr_reg vmsi_addr;
	union msi_data_reg vmsi_data;
	uint64_t vdmask = 0UL;
	uint32_t vdest, dest = 0U;
	uint16_t vcpu_id;
	bool phys;

	vmsi_addr.full = vmsi->msi_addr;
	vmsi_data.full = (uint32_t)vmsi->msi_data;

	dev_dbg(ACRN_DBG_LAPICPT, "%s: msi_addr 0x%016lx, msi_data 0x%016lx",
		__func__, vmsi->msi_addr, vmsi->msi_data);

	if (vmsi_addr.bits.addr_base == MSI_ADDR_BASE) {
		vdest = vmsi_addr.bits.dest_field;
		phys = (vmsi_addr.bits.dest_mode == MSI_ADDR_DESTMODE_PHYS);
		/*
		 * calculate all reachable destination vcpu.
		 * the delivery mode of vmsi will be forwarded to ICR delievry field
		 * and handled by hardware.
		 */
		vlapic_calc_dest_lapic_pt(vm, &vdmask, false, vdest, phys);
		dev_dbg(ACRN_DBG_LAPICPT, "%s: vcpu destination mask 0x%016lx", __func__, vdmask);

		vcpu_id = ffs64(vdmask);
		while (vcpu_id != INVALID_BIT_INDEX) {
			bitmap_clear_nolock(vcpu_id, &vdmask);
			vcpu = vcpu_from_vid(vm, vcpu_id);
			dest |= per_cpu(lapic_ldr, pcpuid_from_vcpu(vcpu));
			vcpu_id = ffs64(vdmask);
		}

		icr.value = 0UL;
		icr.bits.dest_field = dest;
		icr.bits.vector = vmsi_data.bits.vector;
		icr.bits.delivery_mode = vmsi_data.bits.delivery_mode;
		icr.bits.destination_mode = MSI_ADDR_DESTMODE_LOGICAL; 

		msr_write(MSR_IA32_EXT_APIC_ICR, icr.value);
		dev_dbg(ACRN_DBG_LAPICPT, "%s: icr.value 0x%016lx", __func__, icr.value);
	}
}

/**
 * @brief inject MSI interrupt
 *
 * Inject a MSI interrupt for a VM.
 * The function will return -1 if the target VM does not 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_msi_entry
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_inject_msi(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret = -1;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		struct acrn_msi_entry msi;

		if (copy_from_gpa(vm, &msi, param, sizeof(msi)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else {
			/* For target cpu with lapic pt, send ipi instead of injection via vlapic */
			if (is_lapic_pt_configured(target_vm)) {
				enum vm_vlapic_state vlapic_state = check_vm_vlapic_state(target_vm);
				if (vlapic_state == VM_VLAPIC_X2APIC) {
					/*
					 * All the vCPUs of VM are in x2APIC mode and LAPIC is PT
					 * Inject the vMSI as an IPI directly to VM
					 */
					inject_msi_lapic_pt(target_vm, &msi);
					ret = 0;
				} else if (vlapic_state == VM_VLAPIC_XAPIC) {
					/*
					 * All the vCPUs of VM are in xAPIC and use vLAPIC
					 * Inject using vLAPIC
					 */
					ret = vlapic_intr_msi(target_vm, msi.msi_addr, msi.msi_data);
				} else {
					/*
					 * For cases VM_VLAPIC_DISABLED and VM_VLAPIC_TRANSITION
					 * Silently drop interrupt
					 */
				}
			} else {
				ret = vlapic_intr_msi(target_vm, msi.msi_addr, msi.msi_data);
			}
		}
	}

	return ret;
}

/**
 * @brief set ioreq shared buffer
 *
 * Set the ioreq share buffer for a VM.
 * The function will return -1 if the target VM does not 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_set_ioreq_buffer
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_ioreq_buffer(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	uint64_t hpa;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	uint16_t i;
	int32_t ret = -1;

	if (is_created_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		struct acrn_set_ioreq_buffer iobuf;

		if (copy_from_gpa(vm, &iobuf, param, sizeof(iobuf)) != 0) {
			pr_err("%p %s: Unable copy param to vm\n", target_vm, __func__);
	        } else {
			dev_dbg(ACRN_DBG_HYCALL, "[%d] SET BUFFER=0x%p",
					vmid, iobuf.req_buf);

			hpa = gpa2hpa(vm, iobuf.req_buf);
			if (hpa == INVALID_HPA) {
				pr_err("%s,vm[%hu] gpa 0x%lx,GPA is unmapping.",
					__func__, vm->vm_id, iobuf.req_buf);
				target_vm->sw.io_shared_page = NULL;
			} else {
				target_vm->sw.io_shared_page = hpa2hva(hpa);
				for (i = 0U; i < VHM_REQUEST_MAX; i++) {
					set_vhm_req_state(target_vm, i, REQ_STATE_FREE);
				}
				ret = 0;
			}
	        }
	}

	return ret;
}

/**
 * @brief notify request done
 *
 * Notify the requestor VCPU for the completion of an ioreq.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vmid ID of the VM
 * @param vcpu_id vcpu ID of the requestor
 *
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_notify_ioreq_finish(uint16_t vmid, uint16_t vcpu_id)
{
	struct acrn_vcpu *vcpu;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	int32_t ret = -1;

	/* make sure we have set req_buf */
	if ((!is_poweroff_vm(target_vm)) && (is_postlaunched_vm(target_vm)) && (target_vm->sw.io_shared_page != NULL)) {
		dev_dbg(ACRN_DBG_HYCALL, "[%d] NOTIFY_FINISH for vcpu %d",
			vmid, vcpu_id);

		if (vcpu_id >= CONFIG_MAX_VCPUS_PER_VM) {
			pr_err("%s, failed to get VCPU %d context from VM %d\n",
				__func__, vcpu_id, target_vm->vm_id);
		} else {
			vcpu = vcpu_from_vid(target_vm, vcpu_id);
			if (vcpu->state != VCPU_OFFLINE) {
				if (!vcpu->vm->sw.is_completion_polling) {
					resume_vcpu(vcpu);
				}
				ret = 0;
			}
		}
	}

	return ret;
}

/**
 *@pre Pointer vm shall point to SOS_VM
 */
static int32_t add_vm_memory_region(struct acrn_vm *vm, struct acrn_vm *target_vm,
				    const struct vm_memory_region *region,uint64_t *pml4_page)
{
	int32_t ret;
	uint64_t prot;
	uint64_t hpa, base_paddr;

	hpa = gpa2hpa(vm, region->sos_vm_gpa);
	if (hpa == INVALID_HPA) {
		pr_err("%s,vm[%hu] gpa 0x%lx,GPA is unmapping.",
			__func__, vm->vm_id, region->sos_vm_gpa);
		ret = -EINVAL;
	} else {
		base_paddr = hva2hpa((void *)(get_hv_image_base()));
		if (((hpa <= base_paddr) && ((hpa + region->size) > base_paddr)) ||
				((hpa >= base_paddr) && (hpa < (base_paddr + CONFIG_HV_RAM_SIZE)))) {
			pr_err("%s: overlap the HV memory region.", __func__);
			ret = -EFAULT;
		} else {
			prot = 0UL;
			/* access right */
			if ((region->prot & MEM_ACCESS_READ) != 0U) {
				prot |= EPT_RD;
			}
			if ((region->prot & MEM_ACCESS_WRITE) != 0U) {
				prot |= EPT_WR;
			}
			if ((region->prot & MEM_ACCESS_EXEC) != 0U) {
				prot |= EPT_EXE;
			}
			/* memory type */
			if ((region->prot & MEM_TYPE_WB) != 0U) {
				prot |= EPT_WB;
			} else if ((region->prot & MEM_TYPE_WT) != 0U) {
				prot |= EPT_WT;
			} else if ((region->prot & MEM_TYPE_WC) != 0U) {
				prot |= EPT_WC;
			} else if ((region->prot & MEM_TYPE_WP) != 0U) {
				prot |= EPT_WP;
			} else {
				prot |= EPT_UNCACHED;
			}
			/* create gpa to hpa EPT mapping */
			ept_add_mr(target_vm, pml4_page, hpa,
					region->gpa, region->size, prot);
			ret = 0;
		}
	}

	return ret;
}

/**
 *@pre Pointer vm shall point to SOS_VM
 */
static int32_t set_vm_memory_region(struct acrn_vm *vm,
	struct acrn_vm *target_vm, const struct vm_memory_region *region)
{
	uint64_t *pml4_page;
	int32_t ret;

	if ((region->size & (PAGE_SIZE - 1UL)) != 0UL) {
		pr_err("%s: [vm%d] map size 0x%x is not page aligned",
			__func__, target_vm->vm_id, region->size);
		ret = -EINVAL;
	} else {
		if (!ept_is_mr_valid(target_vm, region->gpa, region->size)) {
			pr_err("%s, invalid gpa: 0x%lx, size: 0x%lx, top_address_space: 0x%lx", __func__,
				region->gpa, region->size,
				target_vm->arch_vm.ept_mem_ops.info->ept.top_address_space);
			ret = 0;
		} else {
			dev_dbg(ACRN_DBG_HYCALL,
				"[vm%d] type=%d gpa=0x%x sos_vm_gpa=0x%x size=0x%x",
				target_vm->vm_id, region->type, region->gpa,
				region->sos_vm_gpa, region->size);

			pml4_page = (uint64_t *)target_vm->arch_vm.nworld_eptp;
			if (region->type != MR_DEL) {
				ret = add_vm_memory_region(vm, target_vm, region, pml4_page);
			} else {
				ept_del_mr(target_vm, pml4_page,
						region->gpa, region->size);
				ret = 0;
			}
		}
	}

	return ret;
}

/**
 * @brief setup ept memory mapping for multi regions
 *
 * @param vm Pointer to VM data structure
 * @param param guest physical address. This gpa points to
 *              struct set_memmaps
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_vm_memory_regions(struct acrn_vm *vm, uint64_t param)
{
	struct set_regions regions;
	struct vm_memory_region mr;
	struct acrn_vm *target_vm = NULL;
	uint32_t idx;
	int32_t ret = -1;

	if (copy_from_gpa(vm, &regions, param, sizeof(regions)) == 0) {
		/* the vmid in regions is a relative vm id, need to convert to absolute vm id */
		uint16_t target_vmid = rel_vmid_2_vmid(vm->vm_id, regions.vmid);

		if (target_vmid < CONFIG_MAX_VM_NUM) {
			target_vm = get_vm_from_vmid(target_vmid);
		}
		if ((target_vm != NULL) && !is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
			idx = 0U;
			while (idx < regions.mr_num) {
				if (copy_from_gpa(vm, &mr, regions.regions_gpa + idx * sizeof(mr), sizeof(mr)) != 0) {
					pr_err("%s: Copy mr entry fail from vm\n", __func__);
					break;
				}

				ret = set_vm_memory_region(vm, target_vm, &mr);
				if (ret < 0) {
					break;
				}
				idx++;
			}
		} else {
			pr_err("%p %s:target_vm is invalid or Targeting to service vm", target_vm, __func__);
		}
	}

	return ret;
}

/**
 *@pre Pointer vm shall point to SOS_VM
 */
static int32_t write_protect_page(struct acrn_vm *vm,const struct wp_data *wp)
{
	uint64_t hpa, base_paddr;
	uint64_t prot_set;
	uint64_t prot_clr;
	int32_t ret;

	hpa = gpa2hpa(vm, wp->gpa);
	if (hpa == INVALID_HPA) {
		pr_err("%s,vm[%hu] gpa 0x%lx,GPA is unmapping.",
			__func__, vm->vm_id, wp->gpa);
		ret = -EINVAL;
	} else {
		dev_dbg(ACRN_DBG_HYCALL, "[vm%d] gpa=0x%x hpa=0x%x",
				vm->vm_id, wp->gpa, hpa);

		base_paddr = hva2hpa((void *)(get_hv_image_base()));
		if (((hpa <= base_paddr) && ((hpa + PAGE_SIZE) > base_paddr)) ||
				((hpa >= base_paddr) &&
				(hpa < (base_paddr + CONFIG_HV_RAM_SIZE)))) {
			pr_err("%s: overlap the HV memory region.", __func__);
			ret = -EINVAL;
		} else {
			prot_set = (wp->set != 0U) ? 0UL : EPT_WR;
			prot_clr = (wp->set != 0U) ? EPT_WR : 0UL;

			ept_modify_mr(vm, (uint64_t *)vm->arch_vm.nworld_eptp,
				wp->gpa, PAGE_SIZE, prot_set, prot_clr);
			ret = 0;
		}
	}

	return ret;
}

/**
 * @brief change guest memory page write permission
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param wp_gpa guest physical address. This gpa points to
 *              struct wp_data
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_write_protect_page(struct acrn_vm *vm, uint16_t vmid, uint64_t wp_gpa)
{
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	int32_t ret = -1;

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		struct wp_data wp;

		if (copy_from_gpa(vm, &wp, wp_gpa, sizeof(wp)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else {
			ret = write_protect_page(target_vm, &wp);
		}
	} else {
		pr_err("%p %s: target_vm is invalid", target_vm, __func__);
	}

	return ret;
}

/**
 * @brief translate guest physical address to host physical address
 *
 * Translate guest physical address to host physical address for a VM.
 * The function will return -1 if the target VM does not exist.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param param guest physical address. This gpa points to struct vm_gpa2hpa
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_gpa_to_hpa(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret = -1;
	struct vm_gpa2hpa v_gpa2hpa;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	(void)memset((void *)&v_gpa2hpa, 0U, sizeof(v_gpa2hpa));
	if (!is_poweroff_vm(target_vm) && (!is_prelaunched_vm(target_vm))
			&& (copy_from_gpa(vm, &v_gpa2hpa, param, sizeof(v_gpa2hpa)) == 0)) {
		v_gpa2hpa.hpa = gpa2hpa(target_vm, v_gpa2hpa.gpa);
		if (v_gpa2hpa.hpa == INVALID_HPA) {
			pr_err("%s,vm[%hu] gpa 0x%lx,GPA is unmapping.",
				__func__, target_vm->vm_id, v_gpa2hpa.gpa);
		} else if (copy_to_gpa(vm, &v_gpa2hpa, param, sizeof(v_gpa2hpa)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else {
			ret = 0;
		}
	} else {
		pr_err("target_vm is invalid or HCALL gpa2hpa: Unable copy param from vm\n");
	}

	return ret;
}

/**
 * @brief Assign one passthrough dev to VM.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param param the physical BDF of the assigning ptdev
 *              For the compatibility it still can be the guest physical address that
 *              points to the physical BDF of the assigning ptdev.(Depreciated)
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_assign_ptdev(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret;
	union pci_bdf bdf;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
	bool bdf_valid = true;

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		if (param < 0x10000UL) {
			bdf.value = (uint16_t)param;
		} else {
			if (copy_from_gpa(vm, &bdf, param, sizeof(bdf)) != 0) {
				pr_err("%s: Unable copy param from vm %d\n",
				__func__, vm->vm_id);
				bdf_valid = false;
			        ret = -EIO;
		        }
	        }

		if (bdf_valid) {
			ret = move_pt_device(vm->iommu, target_vm->iommu, bdf.fields.bus, bdf.fields.devfun);
		}
	} else {
		pr_err("%s, target vm is invalid\n", __func__);
		ret = -EINVAL;
	}

	return ret;
}

/**
 * @brief Deassign one passthrough dev from VM.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param param the physical BDF of the deassigning ptdev
 *              To keep the compatibility it still can be the guest physical address that
 *              points to the physical BDF of the deassigning ptdev.(Depreciated)
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_deassign_ptdev(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret = -1;
	union pci_bdf bdf;
	bool bdf_valid = true;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		if (param < 0x10000UL) {
			bdf.value = (uint16_t)param;
		} else {
			if (copy_from_gpa(vm, &bdf, param, sizeof(bdf)) != 0) {
				pr_err("%s: Unable copy param to vm\n", __func__);
				bdf_valid = false;
			}
		}

		if (bdf_valid) {
			ret = move_pt_device(target_vm->iommu, vm->iommu, bdf.fields.bus, bdf.fields.devfun);
		}
	}

	return ret;
}

/**
 * @brief Set interrupt mapping info of ptdev.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param param guest physical address. This gpa points to data structure of
 *              hc_ptdev_irq including intr remapping info
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_ptdev_intr_info(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret = -1;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		struct hc_ptdev_irq irq;

		if (copy_from_gpa(vm, &irq, param, sizeof(irq)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else {
			/* Inform vPCI about the interupt info changes */
			vpci_set_ptdev_intr_info(target_vm, irq.virt_bdf, irq.phys_bdf);

			if (irq.type == IRQ_INTX) {
				ret = ptirq_add_intx_remapping(target_vm, irq.is.intx.virt_pin,
						irq.is.intx.phys_pin, irq.is.intx.pic_pin);
			} else if (((irq.type == IRQ_MSI) || (irq.type == IRQ_MSIX)) &&
					(irq.is.msix.vector_cnt <= CONFIG_MAX_MSIX_TABLE_NUM)) {
				ret = ptirq_add_msix_remapping(target_vm,
						irq.virt_bdf, irq.phys_bdf,
						irq.is.msix.vector_cnt);
			} else {
				pr_err("%s: Invalid irq type: %u or MSIX vector count: %u\n",
						__func__, irq.type, irq.is.msix.vector_cnt);
			}
		}
	}
	return ret;
}

/**
 * @brief Clear interrupt mapping info of ptdev.
 *
 * @param vm Pointer to VM data structure
 * @param vmid ID of the VM
 * @param param guest physical address. This gpa points to data structure of
 *              hc_ptdev_irq including intr remapping info
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t
hcall_reset_ptdev_intr_info(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t ret = -1;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		struct hc_ptdev_irq irq;

		if (copy_from_gpa(vm, &irq, param, sizeof(irq)) != 0) {
			pr_err("%s: Unable copy param to vm\n", __func__);
		} else if (irq.type == IRQ_INTX) {
			vpci_reset_ptdev_intr_info(target_vm, irq.virt_bdf, irq.phys_bdf);
			ptirq_remove_intx_remapping(target_vm,
					irq.is.intx.virt_pin,
					irq.is.intx.pic_pin);
			ret = 0;
		} else if (((irq.type == IRQ_MSI) || (irq.type == IRQ_MSIX)) &&
				(irq.is.msix.vector_cnt <= CONFIG_MAX_MSIX_TABLE_NUM)) {

			/*
			 * Inform vPCI about the interupt info changes
			 * TODO: Need to add bdf info for IRQ_INTX type in devicemodel
			 */
			vpci_reset_ptdev_intr_info(target_vm, irq.virt_bdf, irq.phys_bdf);

			ptirq_remove_msix_remapping(target_vm,
					irq.virt_bdf,
					irq.is.msix.vector_cnt);
			ret = 0;
		} else {
			pr_err("%s: Invalid irq type: %u or MSIX vector count: %u\n",
					__func__, irq.type, irq.is.msix.vector_cnt);
		}
	}

	return ret;
}

/**
 * @brief Get VCPU Power state.
 *
 * @param vm pointer to VM data structure
 * @param cmd cmd to show get which VCPU power state data
 * @param param VCPU power state data
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_get_cpu_pm_state(struct acrn_vm *vm, uint64_t cmd, uint64_t param)
{
	uint16_t target_vm_id;
	struct acrn_vm *target_vm = NULL;
	int32_t ret = -1;

	/* the vmid in cmd is a relative vm id, need to convert to absolute vm id */
	target_vm_id = rel_vmid_2_vmid(vm->vm_id, (uint16_t)((cmd & PMCMD_VMID_MASK) >> PMCMD_VMID_SHIFT));
	if (target_vm_id < CONFIG_MAX_VM_NUM) {
		target_vm = get_vm_from_vmid(target_vm_id);
	}
	if ((target_vm != NULL) && (!is_poweroff_vm(target_vm)) && (is_postlaunched_vm(target_vm))) {
		switch (cmd & PMCMD_TYPE_MASK) {
		case PMCMD_GET_PX_CNT: {

			if (target_vm->pm.px_cnt == 0U) {
			        ret = -1;
			} else if (copy_to_gpa(vm, &(target_vm->pm.px_cnt), param,
						sizeof(target_vm->pm.px_cnt)) != 0) {
				pr_err("%s: Unable copy param to vm\n", __func__);
			        ret = -1;
			} else {
				ret = 0;
			}
			break;
		}
		case PMCMD_GET_PX_DATA: {
			uint8_t pn;
			struct cpu_px_data *px_data;

			/* For now we put px data as per-vm,
			 * If it is stored as per-cpu in the future,
			 * we need to check PMCMD_VCPUID_MASK in cmd.
			 */
			if (target_vm->pm.px_cnt == 0U) {
			        ret = -1;
				break;
			}

			pn = (uint8_t)((cmd & PMCMD_STATE_NUM_MASK) >> PMCMD_STATE_NUM_SHIFT);
			if (pn >= target_vm->pm.px_cnt) {
			        ret = -1;
				break;
			}

			px_data = target_vm->pm.px_data + pn;
			if (copy_to_gpa(vm, px_data, param,
							sizeof(struct cpu_px_data)) != 0) {
				pr_err("%s: Unable copy param to vm\n", __func__);
			        ret = -1;
				break;
			}

		        ret = 0;
			break;
		}
		case PMCMD_GET_CX_CNT: {

			if (target_vm->pm.cx_cnt == 0U) {
			        ret = -1;
			} else if (copy_to_gpa(vm, &(target_vm->pm.cx_cnt), param,
						sizeof(target_vm->pm.cx_cnt)) != 0) {
				pr_err("%s: Unable copy param to vm\n", __func__);
				ret = -1;
			} else {
				ret = 0;
			}
			break;
		}
		case PMCMD_GET_CX_DATA: {
			uint8_t cx_idx;
			struct cpu_cx_data *cx_data;

			if (target_vm->pm.cx_cnt == 0U) {
			        ret = -1;
				break;
			}

			cx_idx = (uint8_t)
				((cmd & PMCMD_STATE_NUM_MASK) >> PMCMD_STATE_NUM_SHIFT);
			if ((cx_idx == 0U) || (cx_idx > target_vm->pm.cx_cnt)) {
			        ret = -1;
				break;
			}

			cx_data = target_vm->pm.cx_data + cx_idx;

			if (copy_to_gpa(vm, cx_data, param,
							sizeof(struct cpu_cx_data)) != 0) {
				pr_err("%s: Unable copy param to vm\n", __func__);
			        ret = -1;
				break;
			}

		        ret = 0;
			break;
		}
		default:
		        ret = -1;
			break;

		}
	}

	return ret;
}

/**
 * @brief Get VCPU a VM's interrupt count data.
 *
 * @param vm pointer to VM data structure
 * @param vmid id of the VM
 * @param param guest physical address. This gpa points to data structure of
 *              acrn_intr_monitor
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_vm_intr_monitor(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
{
	int32_t status = -EINVAL;
	struct acrn_intr_monitor *intr_hdr;
	uint64_t hpa;
	struct acrn_vm *target_vm = get_vm_from_vmid(vmid);

	if (!is_poweroff_vm(target_vm) && is_postlaunched_vm(target_vm)) {
		/* the param for this hypercall is page aligned */
		hpa = gpa2hpa(vm, param);
		if (hpa != INVALID_HPA) {
			intr_hdr = (struct acrn_intr_monitor *)hpa2hva(hpa);
			stac();
			if (intr_hdr->buf_cnt <= (MAX_PTDEV_NUM * 2U)) {
				switch (intr_hdr->cmd) {
				case INTR_CMD_GET_DATA:
					intr_hdr->buf_cnt = ptirq_get_intr_data(target_vm,
						intr_hdr->buffer, intr_hdr->buf_cnt);
					break;

				case INTR_CMD_DELAY_INT:
					/* buffer[0] is the delay time (in MS), if 0 to cancel delay */
					target_vm->intr_inject_delay_delta =
						intr_hdr->buffer[0] * CYCLES_PER_MS;
					break;

				default:
					/* if cmd wrong it goes here should not happen */
					break;
				}

				status = 0;
			}
			clac();
		}
	}

	return status;
}

/**
 * @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(0xF3)
 * to notify the SOS kernel.
 *
 * @param vm Pointer to VM data structure
 * @param param the expected notifier vector from guest
 *
 * @pre Pointer vm shall point to SOS_VM
 * @return 0 on success, non-zero on error.
 */
int32_t hcall_set_callback_vector(const struct acrn_vm *vm, uint64_t param)
{
	int32_t ret;

	if (!is_sos_vm(vm)) {
		pr_err("%s: Targeting to service vm", __func__);
	        ret = -EPERM;
	} else if ((param > NR_MAX_VECTOR) || (param < VECTOR_DYNAMIC_START)) {
		pr_err("%s: Invalid passed vector\n", __func__);
		ret = -EINVAL;
	} else {
		set_vhm_notification_vector((uint32_t)param);
		ret = 0;
	}

	return ret;
}
