110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 - Google LLC
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* Author: Quentin Perret <qperret@google.com>
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*/
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#ifndef __ARM64_KVM_PKVM_H__
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#define __ARM64_KVM_PKVM_H__
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#include <linux/memblock.h>
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#include <asm/kvm_pgtable.h>
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/* Maximum number of VMs that can co-exist under pKVM. */
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#define KVM_MAX_PVMS 255
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#define HYP_MEMBLOCK_REGIONS 128
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int pkvm_init_host_vm(struct kvm *kvm);
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int pkvm_create_hyp_vm(struct kvm *kvm);
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void pkvm_destroy_hyp_vm(struct kvm *kvm);
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extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
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extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
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static inline unsigned long
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hyp_vmemmap_memblock_size(struct memblock_region *reg, size_t vmemmap_entry_size)
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{
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unsigned long nr_pages = reg->size >> PAGE_SHIFT;
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unsigned long start, end;
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start = (reg->base >> PAGE_SHIFT) * vmemmap_entry_size;
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end = start + nr_pages * vmemmap_entry_size;
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start = ALIGN_DOWN(start, PAGE_SIZE);
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end = ALIGN(end, PAGE_SIZE);
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return end - start;
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}
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static inline unsigned long hyp_vmemmap_pages(size_t vmemmap_entry_size)
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{
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unsigned long res = 0, i;
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for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
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res += hyp_vmemmap_memblock_size(&kvm_nvhe_sym(hyp_memory)[i],
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vmemmap_entry_size);
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}
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return res >> PAGE_SHIFT;
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}
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static inline unsigned long hyp_vm_table_pages(void)
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{
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return PAGE_ALIGN(KVM_MAX_PVMS * sizeof(void *)) >> PAGE_SHIFT;
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}
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static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
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{
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unsigned long total = 0, i;
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/* Provision the worst case scenario */
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for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
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nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
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total += nr_pages;
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}
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return total;
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}
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static inline unsigned long __hyp_pgtable_total_pages(void)
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{
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unsigned long res = 0, i;
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/* Cover all of memory with page-granularity */
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for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
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struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
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res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
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}
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return res;
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}
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static inline unsigned long hyp_s1_pgtable_pages(void)
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{
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unsigned long res;
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res = __hyp_pgtable_total_pages();
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/* Allow 1 GiB for private mappings */
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res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
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return res;
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}
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static inline unsigned long host_s2_pgtable_pages(void)
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{
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unsigned long res;
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/*
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* Include an extra 16 pages to safely upper-bound the worst case of
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* concatenated pgds.
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*/
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res = __hyp_pgtable_total_pages() + 16;
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/* Allow 1 GiB for MMIO mappings */
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res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
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return res;
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}
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#endif /* __ARM64_KVM_PKVM_H__ */
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