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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2016 - ARM Ltd
*
* stage2 page table helpers
*/
#ifndef __ARM64_S2_PGTABLE_H_
#define __ARM64_S2_PGTABLE_H_
#include <linux/pgtable.h>
/*
* PGDIR_SHIFT determines the size a top-level page table entry can map
* and depends on the number of levels in the page table. Compute the
* PGDIR_SHIFT for a given number of levels.
*/
#define pt_levels_pgdir_shift(lvls) ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - (lvls))
/*
* The hardware supports concatenation of up to 16 tables at stage2 entry
* level and we use the feature whenever possible, which means we resolve 4
* additional bits of address at the entry level.
*
* This implies, the total number of page table levels required for
* IPA_SHIFT at stage2 expected by the hardware can be calculated using
* the same logic used for the (non-collapsable) stage1 page tables but for
* (IPA_SHIFT - 4).
*/
#define stage2_pgtable_levels(ipa) ARM64_HW_PGTABLE_LEVELS((ipa) - 4)
#define kvm_stage2_levels(kvm) VTCR_EL2_LVLS(kvm->arch.vtcr)
/* stage2_pgdir_shift() is the size mapped by top-level stage2 entry for the VM */
#define stage2_pgdir_shift(kvm) pt_levels_pgdir_shift(kvm_stage2_levels(kvm))
#define stage2_pgdir_size(kvm) (1ULL << stage2_pgdir_shift(kvm))
#define stage2_pgdir_mask(kvm) ~(stage2_pgdir_size(kvm) - 1)
/*
* kvm_mmmu_cache_min_pages() is the number of pages required to install
* a stage-2 translation. We pre-allocate the entry level page table at
* the VM creation.
*/
#define kvm_mmu_cache_min_pages(kvm) (kvm_stage2_levels(kvm) - 1)
static inline phys_addr_t
stage2_pgd_addr_end(struct kvm *kvm, phys_addr_t addr, phys_addr_t end)
{
phys_addr_t boundary = (addr + stage2_pgdir_size(kvm)) & stage2_pgdir_mask(kvm);
return (boundary - 1 < end - 1) ? boundary : end;
}
#endif /* __ARM64_S2_PGTABLE_H_ */
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