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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 - Google LLC
4 * Author: Quentin Perret <qperret@google.com>
5 */
6#ifndef __ARM64_KVM_PKVM_H__
7#define __ARM64_KVM_PKVM_H__
8
9#include <linux/memblock.h>
10#include <asm/kvm_pgtable.h>
11
12#define HYP_MEMBLOCK_REGIONS 128
13
14extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
15extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
16
17static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
18{
19 unsigned long total = 0, i;
20
21 /* Provision the worst case scenario */
22 for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
23 nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
24 total += nr_pages;
25 }
26
27 return total;
28}
29
30static inline unsigned long __hyp_pgtable_total_pages(void)
31{
32 unsigned long res = 0, i;
33
34 /* Cover all of memory with page-granularity */
35 for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
36 struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
37 res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
38 }
39
40 return res;
41}
42
43static inline unsigned long hyp_s1_pgtable_pages(void)
44{
45 unsigned long res;
46
47 res = __hyp_pgtable_total_pages();
48
49 /* Allow 1 GiB for private mappings */
50 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
51
52 return res;
53}
54
55static inline unsigned long host_s2_pgtable_pages(void)
56{
57 unsigned long res;
58
59 /*
60 * Include an extra 16 pages to safely upper-bound the worst case of
61 * concatenated pgds.
62 */
63 res = __hyp_pgtable_total_pages() + 16;
64
65 /* Allow 1 GiB for MMIO mappings */
66 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
67
68 return res;
69}
70
71#endif /* __ARM64_KVM_PKVM_H__ */