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;
60 	int i;
61 
62 	/* Provision the worst case scenario */
63 	for (i = KVM_PGTABLE_FIRST_LEVEL; i <= KVM_PGTABLE_LAST_LEVEL; i++) {
64 		nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
65 		total += nr_pages;
66 	}
67 
68 	return total;
69 }
70 
__hyp_pgtable_total_pages(void)71 static inline unsigned long __hyp_pgtable_total_pages(void)
72 {
73 	unsigned long res = 0, i;
74 
75 	/* Cover all of memory with page-granularity */
76 	for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
77 		struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
78 		res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
79 	}
80 
81 	return res;
82 }
83 
hyp_s1_pgtable_pages(void)84 static inline unsigned long hyp_s1_pgtable_pages(void)
85 {
86 	unsigned long res;
87 
88 	res = __hyp_pgtable_total_pages();
89 
90 	/* Allow 1 GiB for private mappings */
91 	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
92 
93 	return res;
94 }
95 
host_s2_pgtable_pages(void)96 static inline unsigned long host_s2_pgtable_pages(void)
97 {
98 	unsigned long res;
99 
100 	/*
101 	 * Include an extra 16 pages to safely upper-bound the worst case of
102 	 * concatenated pgds.
103 	 */
104 	res = __hyp_pgtable_total_pages() + 16;
105 
106 	/* Allow 1 GiB for MMIO mappings */
107 	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
108 
109 	return res;
110 }
111 
112 #define KVM_FFA_MBOX_NR_PAGES	1
113 
hyp_ffa_proxy_pages(void)114 static inline unsigned long hyp_ffa_proxy_pages(void)
115 {
116 	size_t desc_max;
117 
118 	/*
119 	 * The hypervisor FFA proxy needs enough memory to buffer a fragmented
120 	 * descriptor returned from EL3 in response to a RETRIEVE_REQ call.
121 	 */
122 	desc_max = sizeof(struct ffa_mem_region) +
123 		   sizeof(struct ffa_mem_region_attributes) +
124 		   sizeof(struct ffa_composite_mem_region) +
125 		   SG_MAX_SEGMENTS * sizeof(struct ffa_mem_region_addr_range);
126 
127 	/* Plus a page each for the hypervisor's RX and TX mailboxes. */
128 	return (2 * KVM_FFA_MBOX_NR_PAGES) + DIV_ROUND_UP(desc_max, PAGE_SIZE);
129 }
130 
pkvm_host_sve_state_size(void)131 static inline size_t pkvm_host_sve_state_size(void)
132 {
133 	if (!system_supports_sve())
134 		return 0;
135 
136 	return size_add(sizeof(struct cpu_sve_state),
137 			SVE_SIG_REGS_SIZE(sve_vq_from_vl(kvm_host_sve_max_vl)));
138 }
139 
140 #endif	/* __ARM64_KVM_PKVM_H__ */
141