h_mem_assist.c revision 1.14
1 /* $NetBSD: h_mem_assist.c,v 1.14 2019/10/14 10:39:24 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <stdint.h> 35 #include <stdbool.h> 36 #include <unistd.h> 37 #include <string.h> 38 #include <err.h> 39 #include <errno.h> 40 #include <sys/types.h> 41 #include <sys/mman.h> 42 #include <machine/segments.h> 43 #include <machine/psl.h> 44 #include <machine/pte.h> 45 #include <x86/specialreg.h> 46 47 #include <nvmm.h> 48 49 #define PAGE_SIZE 4096 50 51 static uint8_t mmiobuf[PAGE_SIZE]; 52 static uint8_t *instbuf; 53 54 /* -------------------------------------------------------------------------- */ 55 56 static void 57 mem_callback(struct nvmm_mem *mem) 58 { 59 size_t off; 60 61 if (mem->gpa < 0x1000 || mem->gpa + mem->size > 0x1000 + PAGE_SIZE) { 62 printf("Out of page\n"); 63 exit(-1); 64 } 65 66 off = mem->gpa - 0x1000; 67 68 printf("-> gpa = %p\n", (void *)mem->gpa); 69 70 if (mem->write) { 71 memcpy(mmiobuf + off, mem->data, mem->size); 72 } else { 73 memcpy(mem->data, mmiobuf + off, mem->size); 74 } 75 } 76 77 static int 78 handle_memory(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 79 { 80 int ret; 81 82 ret = nvmm_assist_mem(mach, vcpu); 83 if (ret == -1) { 84 err(errno, "nvmm_assist_mem"); 85 } 86 87 return 0; 88 } 89 90 static void 91 run_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 92 { 93 struct nvmm_exit *exit = vcpu->exit; 94 95 while (1) { 96 if (nvmm_vcpu_run(mach, vcpu) == -1) 97 err(errno, "nvmm_vcpu_run"); 98 99 switch (exit->reason) { 100 case NVMM_EXIT_NONE: 101 break; 102 103 case NVMM_EXIT_MSR: 104 /* Stop here. */ 105 return; 106 107 case NVMM_EXIT_MEMORY: 108 handle_memory(mach, vcpu); 109 break; 110 111 case NVMM_EXIT_SHUTDOWN: 112 printf("Shutting down!\n"); 113 return; 114 115 default: 116 printf("Invalid!\n"); 117 return; 118 } 119 } 120 } 121 122 static struct nvmm_callbacks callbacks = { 123 .io = NULL, 124 .mem = mem_callback 125 }; 126 127 /* -------------------------------------------------------------------------- */ 128 129 struct test { 130 const char *name; 131 uint8_t *code_begin; 132 uint8_t *code_end; 133 uint64_t wanted; 134 uint64_t off; 135 }; 136 137 static void 138 run_test(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu, 139 const struct test *test) 140 { 141 uint64_t *res; 142 size_t size; 143 144 size = (size_t)test->code_end - (size_t)test->code_begin; 145 146 memset(mmiobuf, 0, PAGE_SIZE); 147 memcpy(instbuf, test->code_begin, size); 148 149 run_machine(mach, vcpu); 150 151 res = (uint64_t *)(mmiobuf + test->off); 152 if (*res == test->wanted) { 153 printf("Test '%s' passed\n", test->name); 154 } else { 155 printf("Test '%s' failed, wanted 0x%lx, got 0x%lx\n", test->name, 156 test->wanted, *res); 157 } 158 } 159 160 /* -------------------------------------------------------------------------- */ 161 162 extern uint8_t test1_begin, test1_end; 163 extern uint8_t test2_begin, test2_end; 164 extern uint8_t test3_begin, test3_end; 165 extern uint8_t test4_begin, test4_end; 166 extern uint8_t test5_begin, test5_end; 167 extern uint8_t test6_begin, test6_end; 168 extern uint8_t test7_begin, test7_end; 169 extern uint8_t test8_begin, test8_end; 170 extern uint8_t test9_begin, test9_end; 171 extern uint8_t test10_begin, test10_end; 172 extern uint8_t test11_begin, test11_end; 173 extern uint8_t test12_begin, test12_end; 174 extern uint8_t test13_begin, test13_end; 175 extern uint8_t test14_begin, test14_end; 176 extern uint8_t test_64bit_15_begin, test_64bit_15_end; 177 extern uint8_t test_64bit_16_begin, test_64bit_16_end; 178 179 static const struct test tests64[] = { 180 { "test1 - MOV", &test1_begin, &test1_end, 0x3004, 0 }, 181 { "test2 - OR", &test2_begin, &test2_end, 0x16FF, 0 }, 182 { "test3 - AND", &test3_begin, &test3_end, 0x1FC0, 0 }, 183 { "test4 - XOR", &test4_begin, &test4_end, 0x10CF, 0 }, 184 { "test5 - Address Sizes", &test5_begin, &test5_end, 0x1F00, 0 }, 185 { "test6 - DMO", &test6_begin, &test6_end, 0xFFAB, 0 }, 186 { "test7 - STOS", &test7_begin, &test7_end, 0x00123456, 0 }, 187 { "test8 - LODS", &test8_begin, &test8_end, 0x12345678, 0 }, 188 { "test9 - MOVS", &test9_begin, &test9_end, 0x12345678, 0 }, 189 { "test10 - MOVZXB", &test10_begin, &test10_end, 0x00000078, 0 }, 190 { "test11 - MOVZXW", &test11_begin, &test11_end, 0x00005678, 0 }, 191 { "test12 - CMP", &test12_begin, &test12_end, 0x00000001, 0 }, 192 { "test13 - SUB", &test13_begin, &test13_end, 0x0000000F0000A0FF, 0 }, 193 { "test14 - TEST", &test14_begin, &test14_end, 0x00000001, 0 }, 194 { "test15 - XCHG", &test_64bit_15_begin, &test_64bit_15_end, 0x123456, 0 }, 195 { "test16 - XCHG", &test_64bit_16_begin, &test_64bit_16_end, 196 0x123456, 0 }, 197 { NULL, NULL, NULL, -1, 0 } 198 }; 199 200 static void 201 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 202 { 203 seg->selector = sel; 204 seg->attrib.type = type; 205 seg->attrib.s = (type & 0b10000) != 0; 206 seg->attrib.dpl = 0; 207 seg->attrib.p = 1; 208 seg->attrib.avl = 1; 209 seg->attrib.l = 1; 210 seg->attrib.def = 0; 211 seg->attrib.g = 1; 212 seg->limit = 0x0000FFFF; 213 seg->base = 0x00000000; 214 } 215 216 static void 217 reset_machine64(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 218 { 219 struct nvmm_x64_state *state = vcpu->state; 220 221 memset(state, 0, sizeof(*state)); 222 223 /* Default. */ 224 state->gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 225 init_seg(&state->segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 226 init_seg(&state->segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 227 init_seg(&state->segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 228 init_seg(&state->segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 229 init_seg(&state->segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 230 init_seg(&state->segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 231 232 /* Blank. */ 233 init_seg(&state->segs[NVMM_X64_SEG_GDT], 0, 0); 234 init_seg(&state->segs[NVMM_X64_SEG_IDT], 0, 0); 235 init_seg(&state->segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 236 init_seg(&state->segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 237 238 /* Protected mode enabled. */ 239 state->crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 240 241 /* 64bit mode enabled. */ 242 state->crs[NVMM_X64_CR_CR4] = CR4_PAE; 243 state->msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 244 245 /* Stolen from x86/pmap.c */ 246 #define PATENTRY(n, type) (type << ((n) * 8)) 247 #define PAT_UC 0x0ULL 248 #define PAT_WC 0x1ULL 249 #define PAT_WT 0x4ULL 250 #define PAT_WP 0x5ULL 251 #define PAT_WB 0x6ULL 252 #define PAT_UCMINUS 0x7ULL 253 state->msrs[NVMM_X64_MSR_PAT] = 254 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 255 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 256 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 257 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 258 259 /* Page tables. */ 260 state->crs[NVMM_X64_CR_CR3] = 0x3000; 261 262 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 263 264 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 265 err(errno, "nvmm_vcpu_setstate"); 266 } 267 268 static void 269 map_pages64(struct nvmm_machine *mach) 270 { 271 pt_entry_t *L4, *L3, *L2, *L1; 272 int ret; 273 274 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 275 -1, 0); 276 if (instbuf == MAP_FAILED) 277 err(errno, "mmap"); 278 279 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 280 err(errno, "nvmm_hva_map"); 281 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 282 PROT_READ|PROT_EXEC); 283 if (ret == -1) 284 err(errno, "nvmm_gpa_map"); 285 286 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 287 -1, 0); 288 if (L4 == MAP_FAILED) 289 err(errno, "mmap"); 290 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 291 -1, 0); 292 if (L3 == MAP_FAILED) 293 err(errno, "mmap"); 294 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 295 -1, 0); 296 if (L2 == MAP_FAILED) 297 err(errno, "mmap"); 298 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 299 -1, 0); 300 if (L1 == MAP_FAILED) 301 err(errno, "mmap"); 302 303 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 304 err(errno, "nvmm_hva_map"); 305 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 306 err(errno, "nvmm_hva_map"); 307 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 308 err(errno, "nvmm_hva_map"); 309 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 310 err(errno, "nvmm_hva_map"); 311 312 ret = nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 313 PROT_READ|PROT_WRITE); 314 if (ret == -1) 315 err(errno, "nvmm_gpa_map"); 316 ret = nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 317 PROT_READ|PROT_WRITE); 318 if (ret == -1) 319 err(errno, "nvmm_gpa_map"); 320 ret = nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 321 PROT_READ|PROT_WRITE); 322 if (ret == -1) 323 err(errno, "nvmm_gpa_map"); 324 ret = nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 325 PROT_READ|PROT_WRITE); 326 if (ret == -1) 327 err(errno, "nvmm_gpa_map"); 328 329 memset(L4, 0, PAGE_SIZE); 330 memset(L3, 0, PAGE_SIZE); 331 memset(L2, 0, PAGE_SIZE); 332 memset(L1, 0, PAGE_SIZE); 333 334 L4[0] = PTE_P | PTE_W | 0x4000; 335 L3[0] = PTE_P | PTE_W | 0x5000; 336 L2[0] = PTE_P | PTE_W | 0x6000; 337 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 338 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 339 } 340 341 /* 342 * 0x1000: MMIO address, unmapped 343 * 0x2000: Instructions, mapped 344 * 0x3000: L4 345 * 0x4000: L3 346 * 0x5000: L2 347 * 0x6000: L1 348 */ 349 static void 350 test_vm64(void) 351 { 352 struct nvmm_machine mach; 353 struct nvmm_vcpu vcpu; 354 size_t i; 355 356 if (nvmm_machine_create(&mach) == -1) 357 err(errno, "nvmm_machine_create"); 358 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 359 err(errno, "nvmm_vcpu_create"); 360 nvmm_machine_configure(&mach, NVMM_MACH_CONF_CALLBACKS, &callbacks); 361 map_pages64(&mach); 362 363 for (i = 0; tests64[i].name != NULL; i++) { 364 reset_machine64(&mach, &vcpu); 365 run_test(&mach, &vcpu, &tests64[i]); 366 } 367 368 if (nvmm_machine_destroy(&mach) == -1) 369 err(errno, "nvmm_machine_destroy"); 370 } 371 372 /* -------------------------------------------------------------------------- */ 373 374 extern uint8_t test_16bit_1_begin, test_16bit_1_end; 375 extern uint8_t test_16bit_2_begin, test_16bit_2_end; 376 extern uint8_t test_16bit_3_begin, test_16bit_3_end; 377 extern uint8_t test_16bit_4_begin, test_16bit_4_end; 378 extern uint8_t test_16bit_5_begin, test_16bit_5_end; 379 extern uint8_t test_16bit_6_begin, test_16bit_6_end; 380 381 static const struct test tests16[] = { 382 { "16bit test1 - MOV single", &test_16bit_1_begin, &test_16bit_1_end, 383 0x023, 0x10f1 - 0x1000 }, 384 { "16bit test2 - MOV dual", &test_16bit_2_begin, &test_16bit_2_end, 385 0x123, 0x10f3 - 0x1000 }, 386 { "16bit test3 - MOV dual+disp", &test_16bit_3_begin, &test_16bit_3_end, 387 0x678, 0x10f1 - 0x1000 }, 388 { "16bit test4 - Mixed", &test_16bit_4_begin, &test_16bit_4_end, 389 0x1011, 0x10f6 - 0x1000 }, 390 { "16bit test5 - disp16-only", &test_16bit_5_begin, &test_16bit_5_end, 391 0x12, 0x1234 - 0x1000 }, 392 { "16bit test6 - XCHG", &test_16bit_6_begin, &test_16bit_6_end, 393 0x1234, 0x1234 - 0x1000 }, 394 { NULL, NULL, NULL, -1, -1 } 395 }; 396 397 static void 398 reset_machine16(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 399 { 400 struct nvmm_x64_state *state = vcpu->state; 401 402 if (nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 403 err(errno, "nvmm_vcpu_setstate"); 404 405 state->segs[NVMM_X64_SEG_CS].base = 0; 406 state->segs[NVMM_X64_SEG_CS].limit = 0xFFFFFFFF; 407 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 408 409 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 410 err(errno, "nvmm_vcpu_setstate"); 411 } 412 413 static void 414 map_pages16(struct nvmm_machine *mach) 415 { 416 int ret; 417 418 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 419 -1, 0); 420 if (instbuf == MAP_FAILED) 421 err(errno, "mmap"); 422 423 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 424 err(errno, "nvmm_hva_map"); 425 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 426 PROT_READ|PROT_EXEC); 427 if (ret == -1) 428 err(errno, "nvmm_gpa_map"); 429 } 430 431 /* 432 * 0x1000: MMIO address, unmapped 433 * 0x2000: Instructions, mapped 434 */ 435 static void 436 test_vm16(void) 437 { 438 struct nvmm_machine mach; 439 struct nvmm_vcpu vcpu; 440 size_t i; 441 442 if (nvmm_machine_create(&mach) == -1) 443 err(errno, "nvmm_machine_create"); 444 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 445 err(errno, "nvmm_vcpu_create"); 446 nvmm_machine_configure(&mach, NVMM_MACH_CONF_CALLBACKS, &callbacks); 447 map_pages16(&mach); 448 449 for (i = 0; tests16[i].name != NULL; i++) { 450 reset_machine16(&mach, &vcpu); 451 run_test(&mach, &vcpu, &tests16[i]); 452 } 453 454 if (nvmm_machine_destroy(&mach) == -1) 455 err(errno, "nvmm_machine_destroy"); 456 } 457 458 /* -------------------------------------------------------------------------- */ 459 460 int main(int argc, char *argv[]) 461 { 462 test_vm64(); 463 test_vm16(); 464 return 0; 465 } 466
Indexes created Tue Sep 23 23:09:58 GMT 2025