1 /* $NetBSD: h_mem_assist.c,v 1.19 2020/09/05 07:22:26 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018-2020 Maxime Villard, m00nbsd.net 5 * All rights reserved. 6 * 7 * This code is part of the NVMM hypervisor. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <stdint.h> 34 #include <stdbool.h> 35 #include <unistd.h> 36 #include <string.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <sys/types.h> 40 #include <sys/mman.h> 41 #include <machine/segments.h> 42 #include <machine/psl.h> 43 #include <machine/pte.h> 44 #include <x86/specialreg.h> 45 46 #include <nvmm.h> 47 48 #define PAGE_SIZE 4096 49 50 static uint8_t mmiobuf[PAGE_SIZE]; 51 static uint8_t *instbuf; 52 53 /* -------------------------------------------------------------------------- */ 54 55 static void 56 mem_callback(struct nvmm_mem *mem) 57 { 58 size_t off; 59 60 if (mem->gpa < 0x1000 || mem->gpa + mem->size > 0x1000 + PAGE_SIZE) { 61 printf("Out of page\n"); 62 exit(-1); 63 } 64 65 off = mem->gpa - 0x1000; 66 67 printf("-> gpa = %p\n", (void *)mem->gpa); 68 69 if (mem->write) { 70 memcpy(mmiobuf + off, mem->data, mem->size); 71 } else { 72 memcpy(mem->data, mmiobuf + off, mem->size); 73 } 74 } 75 76 static int 77 handle_memory(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 78 { 79 int ret; 80 81 ret = nvmm_assist_mem(mach, vcpu); 82 if (ret == -1) { 83 err(errno, "nvmm_assist_mem"); 84 } 85 86 return 0; 87 } 88 89 static void 90 run_machine(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 91 { 92 struct nvmm_vcpu_exit *exit = vcpu->exit; 93 94 while (1) { 95 if (nvmm_vcpu_run(mach, vcpu) == -1) 96 err(errno, "nvmm_vcpu_run"); 97 98 switch (exit->reason) { 99 case NVMM_VCPU_EXIT_NONE: 100 break; 101 102 case NVMM_VCPU_EXIT_RDMSR: 103 /* Stop here. */ 104 return; 105 106 case NVMM_VCPU_EXIT_MEMORY: 107 handle_memory(mach, vcpu); 108 break; 109 110 case NVMM_VCPU_EXIT_SHUTDOWN: 111 printf("Shutting down!\n"); 112 return; 113 114 default: 115 printf("Invalid VMEXIT: 0x%lx\n", exit->reason); 116 return; 117 } 118 } 119 } 120 121 static struct nvmm_assist_callbacks callbacks = { 122 .io = NULL, 123 .mem = mem_callback 124 }; 125 126 /* -------------------------------------------------------------------------- */ 127 128 struct test { 129 const char *name; 130 uint8_t *code_begin; 131 uint8_t *code_end; 132 uint64_t wanted; 133 uint64_t off; 134 }; 135 136 static void 137 run_test(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu, 138 const struct test *test) 139 { 140 uint64_t *res; 141 size_t size; 142 143 size = (size_t)test->code_end - (size_t)test->code_begin; 144 145 memset(mmiobuf, 0, PAGE_SIZE); 146 memcpy(instbuf, test->code_begin, size); 147 148 run_machine(mach, vcpu); 149 150 res = (uint64_t *)(mmiobuf + test->off); 151 if (*res == test->wanted) { 152 printf("Test '%s' passed\n", test->name); 153 } else { 154 printf("Test '%s' failed, wanted 0x%lx, got 0x%lx\n", test->name, 155 test->wanted, *res); 156 } 157 } 158 159 /* -------------------------------------------------------------------------- */ 160 161 extern uint8_t test1_begin, test1_end; 162 extern uint8_t test2_begin, test2_end; 163 extern uint8_t test3_begin, test3_end; 164 extern uint8_t test4_begin, test4_end; 165 extern uint8_t test5_begin, test5_end; 166 extern uint8_t test6_begin, test6_end; 167 extern uint8_t test7_begin, test7_end; 168 extern uint8_t test8_begin, test8_end; 169 extern uint8_t test9_begin, test9_end; 170 extern uint8_t test10_begin, test10_end; 171 extern uint8_t test11_begin, test11_end; 172 extern uint8_t test12_begin, test12_end; 173 extern uint8_t test13_begin, test13_end; 174 extern uint8_t test14_begin, test14_end; 175 extern uint8_t test_64bit_15_begin, test_64bit_15_end; 176 extern uint8_t test_64bit_16_begin, test_64bit_16_end; 177 178 static const struct test tests64[] = { 179 { "64bit test1 - MOV", &test1_begin, &test1_end, 0x3004, 0 }, 180 { "64bit test2 - OR", &test2_begin, &test2_end, 0x16FF, 0 }, 181 { "64bit test3 - AND", &test3_begin, &test3_end, 0x1FC0, 0 }, 182 { "64bit test4 - XOR", &test4_begin, &test4_end, 0x10CF, 0 }, 183 { "64bit test5 - Address Sizes", &test5_begin, &test5_end, 0x1F00, 0 }, 184 { "64bit test6 - DMO", &test6_begin, &test6_end, 0xFFAB, 0 }, 185 { "64bit test7 - STOS", &test7_begin, &test7_end, 0x00123456, 0 }, 186 { "64bit test8 - LODS", &test8_begin, &test8_end, 0x12345678, 0 }, 187 { "64bit test9 - MOVS", &test9_begin, &test9_end, 0x12345678, 0 }, 188 { "64bit test10 - MOVZXB", &test10_begin, &test10_end, 0x00000078, 0 }, 189 { "64bit test11 - MOVZXW", &test11_begin, &test11_end, 0x00005678, 0 }, 190 { "64bit test12 - CMP", &test12_begin, &test12_end, 0x00000001, 0 }, 191 { "64bit test13 - SUB", &test13_begin, &test13_end, 0x0000000F0000A0FF, 0 }, 192 { "64bit test14 - TEST", &test14_begin, &test14_end, 0x00000001, 0 }, 193 { "64bit test15 - XCHG", &test_64bit_15_begin, &test_64bit_15_end, 0x123456, 0 }, 194 { "64bit test16 - XCHG", &test_64bit_16_begin, &test_64bit_16_end, 195 0x123456, 0 }, 196 { NULL, NULL, NULL, -1, 0 } 197 }; 198 199 static void 200 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 201 { 202 seg->selector = sel; 203 seg->attrib.type = type; 204 seg->attrib.s = (type & 0b10000) != 0; 205 seg->attrib.dpl = 0; 206 seg->attrib.p = 1; 207 seg->attrib.avl = 1; 208 seg->attrib.l = 1; 209 seg->attrib.def = 0; 210 seg->attrib.g = 1; 211 seg->limit = 0x0000FFFF; 212 seg->base = 0x00000000; 213 } 214 215 static void 216 reset_machine64(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 217 { 218 struct nvmm_x64_state *state = vcpu->state; 219 220 if (nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 221 err(errno, "nvmm_vcpu_getstate"); 222 223 memset(state, 0, sizeof(*state)); 224 225 /* Default. */ 226 state->gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 227 init_seg(&state->segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 228 init_seg(&state->segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 229 init_seg(&state->segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 230 init_seg(&state->segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 231 init_seg(&state->segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 232 init_seg(&state->segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 233 234 /* Blank. */ 235 init_seg(&state->segs[NVMM_X64_SEG_GDT], 0, 0); 236 init_seg(&state->segs[NVMM_X64_SEG_IDT], 0, 0); 237 init_seg(&state->segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 238 init_seg(&state->segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 239 240 /* Protected mode enabled. */ 241 state->crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 242 243 /* 64bit mode enabled. */ 244 state->crs[NVMM_X64_CR_CR4] = CR4_PAE; 245 state->msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 246 247 /* Stolen from x86/pmap.c */ 248 #define PATENTRY(n, type) (type << ((n) * 8)) 249 #define PAT_UC 0x0ULL 250 #define PAT_WC 0x1ULL 251 #define PAT_WT 0x4ULL 252 #define PAT_WP 0x5ULL 253 #define PAT_WB 0x6ULL 254 #define PAT_UCMINUS 0x7ULL 255 state->msrs[NVMM_X64_MSR_PAT] = 256 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 257 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 258 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 259 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 260 261 /* Page tables. */ 262 state->crs[NVMM_X64_CR_CR3] = 0x3000; 263 264 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 265 266 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 267 err(errno, "nvmm_vcpu_setstate"); 268 } 269 270 static void 271 map_pages64(struct nvmm_machine *mach) 272 { 273 pt_entry_t *L4, *L3, *L2, *L1; 274 int ret; 275 276 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 277 -1, 0); 278 if (instbuf == MAP_FAILED) 279 err(errno, "mmap"); 280 281 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 282 err(errno, "nvmm_hva_map"); 283 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 284 PROT_READ|PROT_EXEC); 285 if (ret == -1) 286 err(errno, "nvmm_gpa_map"); 287 288 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 289 -1, 0); 290 if (L4 == MAP_FAILED) 291 err(errno, "mmap"); 292 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 293 -1, 0); 294 if (L3 == MAP_FAILED) 295 err(errno, "mmap"); 296 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 297 -1, 0); 298 if (L2 == MAP_FAILED) 299 err(errno, "mmap"); 300 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 301 -1, 0); 302 if (L1 == MAP_FAILED) 303 err(errno, "mmap"); 304 305 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 306 err(errno, "nvmm_hva_map"); 307 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 308 err(errno, "nvmm_hva_map"); 309 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 310 err(errno, "nvmm_hva_map"); 311 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 312 err(errno, "nvmm_hva_map"); 313 314 ret = nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 315 PROT_READ|PROT_WRITE); 316 if (ret == -1) 317 err(errno, "nvmm_gpa_map"); 318 ret = nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 319 PROT_READ|PROT_WRITE); 320 if (ret == -1) 321 err(errno, "nvmm_gpa_map"); 322 ret = nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 323 PROT_READ|PROT_WRITE); 324 if (ret == -1) 325 err(errno, "nvmm_gpa_map"); 326 ret = nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 327 PROT_READ|PROT_WRITE); 328 if (ret == -1) 329 err(errno, "nvmm_gpa_map"); 330 331 memset(L4, 0, PAGE_SIZE); 332 memset(L3, 0, PAGE_SIZE); 333 memset(L2, 0, PAGE_SIZE); 334 memset(L1, 0, PAGE_SIZE); 335 336 L4[0] = PTE_P | PTE_W | 0x4000; 337 L3[0] = PTE_P | PTE_W | 0x5000; 338 L2[0] = PTE_P | PTE_W | 0x6000; 339 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 340 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 341 } 342 343 /* 344 * 0x1000: MMIO address, unmapped 345 * 0x2000: Instructions, mapped 346 * 0x3000: L4 347 * 0x4000: L3 348 * 0x5000: L2 349 * 0x6000: L1 350 */ 351 static void 352 test_vm64(void) 353 { 354 struct nvmm_machine mach; 355 struct nvmm_vcpu vcpu; 356 size_t i; 357 358 if (nvmm_machine_create(&mach) == -1) 359 err(errno, "nvmm_machine_create"); 360 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 361 err(errno, "nvmm_vcpu_create"); 362 nvmm_vcpu_configure(&mach, &vcpu, NVMM_VCPU_CONF_CALLBACKS, &callbacks); 363 map_pages64(&mach); 364 365 for (i = 0; tests64[i].name != NULL; i++) { 366 reset_machine64(&mach, &vcpu); 367 run_test(&mach, &vcpu, &tests64[i]); 368 } 369 370 if (nvmm_vcpu_destroy(&mach, &vcpu) == -1) 371 err(errno, "nvmm_vcpu_destroy"); 372 if (nvmm_machine_destroy(&mach) == -1) 373 err(errno, "nvmm_machine_destroy"); 374 } 375 376 /* -------------------------------------------------------------------------- */ 377 378 extern uint8_t test_16bit_1_begin, test_16bit_1_end; 379 extern uint8_t test_16bit_2_begin, test_16bit_2_end; 380 extern uint8_t test_16bit_3_begin, test_16bit_3_end; 381 extern uint8_t test_16bit_4_begin, test_16bit_4_end; 382 extern uint8_t test_16bit_5_begin, test_16bit_5_end; 383 extern uint8_t test_16bit_6_begin, test_16bit_6_end; 384 385 static const struct test tests16[] = { 386 { "16bit test1 - MOV single", &test_16bit_1_begin, &test_16bit_1_end, 387 0x023, 0x10f1 - 0x1000 }, 388 { "16bit test2 - MOV dual", &test_16bit_2_begin, &test_16bit_2_end, 389 0x123, 0x10f3 - 0x1000 }, 390 { "16bit test3 - MOV dual+disp", &test_16bit_3_begin, &test_16bit_3_end, 391 0x678, 0x10f1 - 0x1000 }, 392 { "16bit test4 - Mixed", &test_16bit_4_begin, &test_16bit_4_end, 393 0x1011, 0x10f6 - 0x1000 }, 394 { "16bit test5 - disp16-only", &test_16bit_5_begin, &test_16bit_5_end, 395 0x12, 0x1234 - 0x1000 }, 396 { "16bit test6 - XCHG", &test_16bit_6_begin, &test_16bit_6_end, 397 0x1234, 0x1234 - 0x1000 }, 398 { NULL, NULL, NULL, -1, -1 } 399 }; 400 401 static void 402 reset_machine16(struct nvmm_machine *mach, struct nvmm_vcpu *vcpu) 403 { 404 struct nvmm_x64_state *state = vcpu->state; 405 406 if (nvmm_vcpu_getstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 407 err(errno, "nvmm_vcpu_getstate"); 408 409 state->segs[NVMM_X64_SEG_CS].base = 0; 410 state->segs[NVMM_X64_SEG_CS].limit = 0x2FFF; 411 state->gprs[NVMM_X64_GPR_RIP] = 0x2000; 412 413 if (nvmm_vcpu_setstate(mach, vcpu, NVMM_X64_STATE_ALL) == -1) 414 err(errno, "nvmm_vcpu_setstate"); 415 } 416 417 static void 418 map_pages16(struct nvmm_machine *mach) 419 { 420 int ret; 421 422 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 423 -1, 0); 424 if (instbuf == MAP_FAILED) 425 err(errno, "mmap"); 426 427 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 428 err(errno, "nvmm_hva_map"); 429 ret = nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 430 PROT_READ|PROT_EXEC); 431 if (ret == -1) 432 err(errno, "nvmm_gpa_map"); 433 } 434 435 /* 436 * 0x1000: MMIO address, unmapped 437 * 0x2000: Instructions, mapped 438 */ 439 static void 440 test_vm16(void) 441 { 442 struct nvmm_machine mach; 443 struct nvmm_vcpu vcpu; 444 size_t i; 445 446 if (nvmm_machine_create(&mach) == -1) 447 err(errno, "nvmm_machine_create"); 448 if (nvmm_vcpu_create(&mach, 0, &vcpu) == -1) 449 err(errno, "nvmm_vcpu_create"); 450 nvmm_vcpu_configure(&mach, &vcpu, NVMM_VCPU_CONF_CALLBACKS, &callbacks); 451 map_pages16(&mach); 452 453 for (i = 0; tests16[i].name != NULL; i++) { 454 reset_machine16(&mach, &vcpu); 455 run_test(&mach, &vcpu, &tests16[i]); 456 } 457 458 if (nvmm_vcpu_destroy(&mach, &vcpu) == -1) 459 err(errno, "nvmm_vcpu_destroy"); 460 if (nvmm_machine_destroy(&mach) == -1) 461 err(errno, "nvmm_machine_destroy"); 462 } 463 464 /* -------------------------------------------------------------------------- */ 465 466 int main(int argc, char *argv[]) 467 { 468 if (nvmm_init() == -1) 469 err(errno, "nvmm_init"); 470 test_vm64(); 471 test_vm16(); 472 return 0; 473 } 474