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, 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 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 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 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 1 112 113 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