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 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 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 52 static inline unsigned long hyp_vm_table_pages(void) 53 { 54 return PAGE_ALIGN(KVM_MAX_PVMS * sizeof(void *)) >> PAGE_SHIFT; 55 } 56 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 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 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 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 1 113 114 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 } 130 131 #endif /* __ARM64_KVM_PKVM_H__ */ 132