Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 | /* * gaccess.h - access guest memory * * Copyright IBM Corp. 2008 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2 only) * as published by the Free Software Foundation. * * Author(s): Carsten Otte <cotte@de.ibm.com> */ #ifndef __KVM_S390_GACCESS_H #define __KVM_S390_GACCESS_H #include <linux/compiler.h> #include <linux/kvm_host.h> #include <asm/uaccess.h> static inline void __user *__guestaddr_to_user(struct kvm_vcpu *vcpu, unsigned long guestaddr) { unsigned long prefix = vcpu->arch.sie_block->prefix; unsigned long origin = vcpu->kvm->arch.guest_origin; unsigned long memsize = vcpu->kvm->arch.guest_memsize; if (guestaddr < 2 * PAGE_SIZE) guestaddr += prefix; else if ((guestaddr >= prefix) && (guestaddr < prefix + 2 * PAGE_SIZE)) guestaddr -= prefix; if (guestaddr > memsize) return (void __user __force *) ERR_PTR(-EFAULT); guestaddr += origin; return (void __user *) guestaddr; } static inline int get_guest_u64(struct kvm_vcpu *vcpu, unsigned long guestaddr, u64 *result) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 7); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return get_user(*result, (unsigned long __user *) uptr); } static inline int get_guest_u32(struct kvm_vcpu *vcpu, unsigned long guestaddr, u32 *result) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 3); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return get_user(*result, (u32 __user *) uptr); } static inline int get_guest_u16(struct kvm_vcpu *vcpu, unsigned long guestaddr, u16 *result) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 1); if (IS_ERR(uptr)) return PTR_ERR(uptr); return get_user(*result, (u16 __user *) uptr); } static inline int get_guest_u8(struct kvm_vcpu *vcpu, unsigned long guestaddr, u8 *result) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return get_user(*result, (u8 __user *) uptr); } static inline int put_guest_u64(struct kvm_vcpu *vcpu, unsigned long guestaddr, u64 value) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 7); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return put_user(value, (u64 __user *) uptr); } static inline int put_guest_u32(struct kvm_vcpu *vcpu, unsigned long guestaddr, u32 value) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 3); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return put_user(value, (u32 __user *) uptr); } static inline int put_guest_u16(struct kvm_vcpu *vcpu, unsigned long guestaddr, u16 value) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); BUG_ON(guestaddr & 1); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return put_user(value, (u16 __user *) uptr); } static inline int put_guest_u8(struct kvm_vcpu *vcpu, unsigned long guestaddr, u8 value) { void __user *uptr = __guestaddr_to_user(vcpu, guestaddr); if (IS_ERR((void __force *) uptr)) return PTR_ERR((void __force *) uptr); return put_user(value, (u8 __user *) uptr); } static inline int __copy_to_guest_slow(struct kvm_vcpu *vcpu, unsigned long guestdest, const void *from, unsigned long n) { int rc; unsigned long i; const u8 *data = from; for (i = 0; i < n; i++) { rc = put_guest_u8(vcpu, guestdest++, *(data++)); if (rc < 0) return rc; } return 0; } static inline int copy_to_guest(struct kvm_vcpu *vcpu, unsigned long guestdest, const void *from, unsigned long n) { unsigned long prefix = vcpu->arch.sie_block->prefix; unsigned long origin = vcpu->kvm->arch.guest_origin; unsigned long memsize = vcpu->kvm->arch.guest_memsize; if ((guestdest < 2 * PAGE_SIZE) && (guestdest + n > 2 * PAGE_SIZE)) goto slowpath; if ((guestdest < prefix) && (guestdest + n > prefix)) goto slowpath; if ((guestdest < prefix + 2 * PAGE_SIZE) && (guestdest + n > prefix + 2 * PAGE_SIZE)) goto slowpath; if (guestdest < 2 * PAGE_SIZE) guestdest += prefix; else if ((guestdest >= prefix) && (guestdest < prefix + 2 * PAGE_SIZE)) guestdest -= prefix; if (guestdest + n > memsize) return -EFAULT; if (guestdest + n < guestdest) return -EFAULT; guestdest += origin; return copy_to_user((void __user *) guestdest, from, n); slowpath: return __copy_to_guest_slow(vcpu, guestdest, from, n); } static inline int __copy_from_guest_slow(struct kvm_vcpu *vcpu, void *to, unsigned long guestsrc, unsigned long n) { int rc; unsigned long i; u8 *data = to; for (i = 0; i < n; i++) { rc = get_guest_u8(vcpu, guestsrc++, data++); if (rc < 0) return rc; } return 0; } static inline int copy_from_guest(struct kvm_vcpu *vcpu, void *to, unsigned long guestsrc, unsigned long n) { unsigned long prefix = vcpu->arch.sie_block->prefix; unsigned long origin = vcpu->kvm->arch.guest_origin; unsigned long memsize = vcpu->kvm->arch.guest_memsize; if ((guestsrc < 2 * PAGE_SIZE) && (guestsrc + n > 2 * PAGE_SIZE)) goto slowpath; if ((guestsrc < prefix) && (guestsrc + n > prefix)) goto slowpath; if ((guestsrc < prefix + 2 * PAGE_SIZE) && (guestsrc + n > prefix + 2 * PAGE_SIZE)) goto slowpath; if (guestsrc < 2 * PAGE_SIZE) guestsrc += prefix; else if ((guestsrc >= prefix) && (guestsrc < prefix + 2 * PAGE_SIZE)) guestsrc -= prefix; if (guestsrc + n > memsize) return -EFAULT; if (guestsrc + n < guestsrc) return -EFAULT; guestsrc += origin; return copy_from_user(to, (void __user *) guestsrc, n); slowpath: return __copy_from_guest_slow(vcpu, to, guestsrc, n); } static inline int copy_to_guest_absolute(struct kvm_vcpu *vcpu, unsigned long guestdest, const void *from, unsigned long n) { unsigned long origin = vcpu->kvm->arch.guest_origin; unsigned long memsize = vcpu->kvm->arch.guest_memsize; if (guestdest + n > memsize) return -EFAULT; if (guestdest + n < guestdest) return -EFAULT; guestdest += origin; return copy_to_user((void __user *) guestdest, from, n); } static inline int copy_from_guest_absolute(struct kvm_vcpu *vcpu, void *to, unsigned long guestsrc, unsigned long n) { unsigned long origin = vcpu->kvm->arch.guest_origin; unsigned long memsize = vcpu->kvm->arch.guest_memsize; if (guestsrc + n > memsize) return -EFAULT; if (guestsrc + n < guestsrc) return -EFAULT; guestsrc += origin; return copy_from_user(to, (void __user *) guestsrc, n); } #endif |