/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2021 Google LLC
 * Author: Fuad Tabba <tabba@google.com>
 */

#ifndef __ARM64_KVM_NVHE_PKVM_H__
#define __ARM64_KVM_NVHE_PKVM_H__

#include <asm/kvm_pkvm.h>

#include <nvhe/gfp.h>
#include <nvhe/spinlock.h>

/*
 * Holds the relevant data for maintaining the vcpu state completely at hyp.
 */
struct pkvm_hyp_vcpu {
	struct kvm_vcpu vcpu;

	/* Backpointer to the host's (untrusted) vCPU instance. */
	struct kvm_vcpu *host_vcpu;

	/*
	 * If this hyp vCPU is loaded, then this is a backpointer to the
	 * per-cpu pointer tracking us. Otherwise, NULL if not loaded.
	 */
	struct pkvm_hyp_vcpu **loaded_hyp_vcpu;
};

/*
 * Holds the relevant data for running a vm in protected mode.
 */
struct pkvm_hyp_vm {
	struct kvm kvm;

	/* Backpointer to the host's (untrusted) KVM instance. */
	struct kvm *host_kvm;

	/* The guest's stage-2 page-table managed by the hypervisor. */
	struct kvm_pgtable pgt;
	struct kvm_pgtable_mm_ops mm_ops;
	struct hyp_pool pool;
	hyp_spinlock_t lock;

	/* Array of the hyp vCPU structures for this VM. */
	struct pkvm_hyp_vcpu *vcpus[];
};

extern hyp_spinlock_t vm_table_lock;

static inline struct pkvm_hyp_vm *
pkvm_hyp_vcpu_to_hyp_vm(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	return container_of(hyp_vcpu->vcpu.kvm, struct pkvm_hyp_vm, kvm);
}

static inline bool pkvm_hyp_vcpu_is_protected(struct pkvm_hyp_vcpu *hyp_vcpu)
{
	return vcpu_is_protected(&hyp_vcpu->vcpu);
}

static inline bool pkvm_hyp_vm_is_protected(struct pkvm_hyp_vm *hyp_vm)
{
	return kvm_vm_is_protected(&hyp_vm->kvm);
}

void pkvm_hyp_vm_table_init(void *tbl);

int __pkvm_reserve_vm(void);
void __pkvm_unreserve_vm(pkvm_handle_t handle);
int __pkvm_init_vm(struct kvm *host_kvm, unsigned long vm_hva,
		   unsigned long pgd_hva);
int __pkvm_init_vcpu(pkvm_handle_t handle, struct kvm_vcpu *host_vcpu,
		     unsigned long vcpu_hva);

int __pkvm_reclaim_dying_guest_page(pkvm_handle_t handle, u64 gfn);
int __pkvm_start_teardown_vm(pkvm_handle_t handle);
int __pkvm_finalize_teardown_vm(pkvm_handle_t handle);

struct pkvm_hyp_vm *get_vm_by_handle(pkvm_handle_t handle);
struct pkvm_hyp_vcpu *pkvm_load_hyp_vcpu(pkvm_handle_t handle,
					 unsigned int vcpu_idx);
void pkvm_put_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu);
struct pkvm_hyp_vcpu *pkvm_get_loaded_hyp_vcpu(void);

struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle);
struct pkvm_hyp_vm *get_np_pkvm_hyp_vm(pkvm_handle_t handle);
void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm);

bool kvm_handle_pvm_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code);
bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code);
bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code);
void kvm_init_pvm_id_regs(struct kvm_vcpu *vcpu);
int kvm_check_pvm_sysreg_table(void);

#endif /* __ARM64_KVM_NVHE_PKVM_H__ */
