/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2020 Google LLC
 * Author: Quentin Perret <[email protected]>
 */

#ifndef __KVM_NVHE_MEM_PROTECT__
#define __KVM_NVHE_MEM_PROTECT__
#include <linux/kvm_host.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_pgtable.h>
#include <asm/virt.h>
#include <nvhe/memory.h>
#include <nvhe/pkvm.h>
#include <nvhe/spinlock.h>

struct host_mmu {
	struct kvm_arch arch;
	struct kvm_pgtable pgt;
	struct kvm_pgtable_mm_ops mm_ops;
	hyp_spinlock_t lock;
};
extern struct host_mmu host_mmu;

/* This corresponds to page-table locking order */
enum pkvm_component_id {
	PKVM_ID_HOST,
	PKVM_ID_HYP,
	PKVM_ID_FFA,
};

extern unsigned long hyp_nr_cpus;

int __pkvm_prot_finalize(void);
int __pkvm_host_share_hyp(u64 pfn);
int __pkvm_host_unshare_hyp(u64 pfn);
int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages);
int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages);
int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages);
int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages);
int __pkvm_host_share_guest(u64 pfn, u64 gfn, struct pkvm_hyp_vcpu *vcpu,
			    enum kvm_pgtable_prot prot);
int __pkvm_host_unshare_guest(u64 gfn, struct pkvm_hyp_vm *hyp_vm);
int __pkvm_host_relax_perms_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu, enum kvm_pgtable_prot prot);
int __pkvm_host_wrprotect_guest(u64 gfn, struct pkvm_hyp_vm *hyp_vm);
int __pkvm_host_test_clear_young_guest(u64 gfn, bool mkold, struct pkvm_hyp_vm *vm);
int __pkvm_host_mkyoung_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu);

bool addr_is_memory(phys_addr_t phys);
int host_stage2_idmap_locked(phys_addr_t addr, u64 size, enum kvm_pgtable_prot prot);
int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id);
int kvm_host_prepare_stage2(void *pgt_pool_base);
int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, void *pgd);
void handle_host_mem_abort(struct kvm_cpu_context *host_ctxt);

int hyp_pin_shared_mem(void *from, void *to);
void hyp_unpin_shared_mem(void *from, void *to);
void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *mc);
int refill_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages,
		    struct kvm_hyp_memcache *host_mc);

static __always_inline void __load_host_stage2(void)
{
	if (static_branch_likely(&kvm_protected_mode_initialized))
		__load_stage2(&host_mmu.arch.mmu, &host_mmu.arch);
	else
		write_sysreg(0, vttbr_el2);
}
#endif /* __KVM_NVHE_MEM_PROTECT__ */