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

#include <vm.h>
#include <vm_reset.h>
#include <vmcs.h>
#include <vmexit.h>
#include <irq.h>
#include <schedule.h>
#include <softirq.h>
#include <profiling.h>
#include <trace.h>
#include <logmsg.h>

void vcpu_thread(struct sched_object *obj)
{
	struct acrn_vcpu *vcpu = list_entry(obj, struct acrn_vcpu, sched_obj);
	uint32_t basic_exit_reason = 0U;
	int32_t ret = 0;

	do {
		/* If vcpu is not launched, we need to do init_vmcs first */
		if (!vcpu->launched) {
			init_vmcs(vcpu);
		}

		if (!is_lapic_pt_enabled(vcpu)) {
			CPU_IRQ_DISABLE();
		}

		/* Don't open interrupt window between here and vmentry */
		if (need_reschedule(vcpu->pcpu_id)) {
			schedule();
		}

		/* Check and process pending requests(including interrupt) */
		ret = acrn_handle_pending_request(vcpu);
		if (ret < 0) {
			pr_fatal("vcpu handling pending request fail");
			pause_vcpu(vcpu, VCPU_ZOMBIE);
			/* Fatal error happened (triple fault). Stop the vcpu running. */
			schedule();
		}

		profiling_vmenter_handler(vcpu);

		TRACE_2L(TRACE_VM_ENTER, 0UL, 0UL);
		ret = run_vcpu(vcpu);
		if (ret != 0) {
			pr_fatal("vcpu resume failed");
			pause_vcpu(vcpu, VCPU_ZOMBIE);
			/* Fatal error happened (resume vcpu failed). Stop the vcpu running. */
			schedule();
		}
		basic_exit_reason = vcpu->arch.exit_reason & 0xFFFFU;
		TRACE_2L(TRACE_VM_EXIT, basic_exit_reason, vcpu_get_rip(vcpu));

		vcpu->arch.nrexits++;

		profiling_pre_vmexit_handler(vcpu);

		if (!is_lapic_pt_enabled(vcpu)) {
			CPU_IRQ_ENABLE();
		}
		/* Dispatch handler */
		ret = vmexit_handler(vcpu);
		if (ret < 0) {
			pr_fatal("dispatch VM exit handler failed for reason"
				" %d, ret = %d!", basic_exit_reason, ret);
			vcpu_inject_gp(vcpu, 0U);
			continue;
		}

		profiling_post_vmexit_handler(vcpu);
	} while (1);
}

void default_idle(__unused struct sched_object *obj)
{
	uint16_t pcpu_id = get_pcpu_id();

	while (1) {
		if (need_reschedule(pcpu_id)) {
			schedule();
		} else if (need_offline(pcpu_id)) {
			cpu_dead();
		} else if (need_shutdown_vm(pcpu_id)) {
			shutdown_vm_from_idle(pcpu_id);
		} else {
			CPU_IRQ_ENABLE();
			cpu_do_idle();
			CPU_IRQ_DISABLE();
		}
	}
}