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/arm_ffa.h>
10 #include <linux/memblock.h>
11 #include <linux/scatterlist.h>
12 #include <asm/kvm_pgtable.h>
13
14 /* Maximum number of VMs that can co-exist under pKVM. */
15 #define KVM_MAX_PVMS 255
16
17 #define HYP_MEMBLOCK_REGIONS 128
18
19 int pkvm_init_host_vm(struct kvm *kvm);
20 int pkvm_create_hyp_vm(struct kvm *kvm);
21 void pkvm_destroy_hyp_vm(struct kvm *kvm);
22
23 extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
24 extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
25
26 static inline unsigned long
hyp_vmemmap_memblock_size(struct memblock_region * reg,size_t vmemmap_entry_size)27 hyp_vmemmap_memblock_size(struct memblock_region *reg, size_t vmemmap_entry_size)
28 {
29 unsigned long nr_pages = reg->size >> PAGE_SHIFT;
30 unsigned long start, end;
31
32 start = (reg->base >> PAGE_SHIFT) * vmemmap_entry_size;
33 end = start + nr_pages * vmemmap_entry_size;
34 start = ALIGN_DOWN(start, PAGE_SIZE);
35 end = ALIGN(end, PAGE_SIZE);
36
37 return end - start;
38 }
39
hyp_vmemmap_pages(size_t vmemmap_entry_size)40 static inline unsigned long hyp_vmemmap_pages(size_t vmemmap_entry_size)
41 {
42 unsigned long res = 0, i;
43
44 for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
45 res += hyp_vmemmap_memblock_size(&kvm_nvhe_sym(hyp_memory)[i],
46 vmemmap_entry_size);
47 }
48
49 return res >> PAGE_SHIFT;
50 }
51
hyp_vm_table_pages(void)52 static inline unsigned long hyp_vm_table_pages(void)
53 {
54 return PAGE_ALIGN(KVM_MAX_PVMS * sizeof(void *)) >> PAGE_SHIFT;
55 }
56
__hyp_pgtable_max_pages(unsigned long nr_pages)57 static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
58 {
59 unsigned long total = 0, i;
60
61 /* Provision the worst case scenario */
62 for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
63 nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
64 total += nr_pages;
65 }
66
67 return total;
68 }
69
__hyp_pgtable_total_pages(void)70 static inline unsigned long __hyp_pgtable_total_pages(void)
71 {
72 unsigned long res = 0, i;
73
74 /* Cover all of memory with page-granularity */
75 for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
76 struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
77 res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
78 }
79
80 return res;
81 }
82
hyp_s1_pgtable_pages(void)83 static inline unsigned long hyp_s1_pgtable_pages(void)
84 {
85 unsigned long res;
86
87 res = __hyp_pgtable_total_pages();
88
89 /* Allow 1 GiB for private mappings */
90 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
91
92 return res;
93 }
94
host_s2_pgtable_pages(void)95 static inline unsigned long host_s2_pgtable_pages(void)
96 {
97 unsigned long res;
98
99 /*
100 * Include an extra 16 pages to safely upper-bound the worst case of
101 * concatenated pgds.
102 */
103 res = __hyp_pgtable_total_pages() + 16;
104
105 /* Allow 1 GiB for MMIO mappings */
106 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
107
108 return res;
109 }
110
111 #define KVM_FFA_MBOX_NR_PAGES 1
112
hyp_ffa_proxy_pages(void)113 static inline unsigned long hyp_ffa_proxy_pages(void)
114 {
115 size_t desc_max;
116
117 /*
118 * The hypervisor FFA proxy needs enough memory to buffer a fragmented
119 * descriptor returned from EL3 in response to a RETRIEVE_REQ call.
120 */
121 desc_max = sizeof(struct ffa_mem_region) +
122 sizeof(struct ffa_mem_region_attributes) +
123 sizeof(struct ffa_composite_mem_region) +
124 SG_MAX_SEGMENTS * sizeof(struct ffa_mem_region_addr_range);
125
126 /* Plus a page each for the hypervisor's RX and TX mailboxes. */
127 return (2 * KVM_FFA_MBOX_NR_PAGES) + DIV_ROUND_UP(desc_max, PAGE_SIZE);
128 }
129
130 #endif /* __ARM64_KVM_PKVM_H__ */
131