h_mem_assist.c revision 1.7
1 /* $NetBSD: h_mem_assist.c,v 1.7 2019/03/19 19:23:39 maxv Exp $ */ 2 3 /* 4 * Copyright (c) 2018 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 static void 55 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 56 { 57 seg->selector = sel; 58 seg->attrib.type = type; 59 seg->attrib.s = (type & 0b10000) != 0; 60 seg->attrib.dpl = 0; 61 seg->attrib.p = 1; 62 seg->attrib.avl = 1; 63 seg->attrib.l = 1; 64 seg->attrib.def = 0; 65 seg->attrib.g = 1; 66 seg->limit = 0x0000FFFF; 67 seg->base = 0x00000000; 68 } 69 70 static void 71 reset_machine(struct nvmm_machine *mach) 72 { 73 struct nvmm_x64_state state; 74 75 memset(&state, 0, sizeof(state)); 76 77 /* Default. */ 78 state.gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 79 init_seg(&state.segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 80 init_seg(&state.segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 81 init_seg(&state.segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 82 init_seg(&state.segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 83 init_seg(&state.segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 84 init_seg(&state.segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 85 86 /* Blank. */ 87 init_seg(&state.segs[NVMM_X64_SEG_GDT], 0, 0); 88 init_seg(&state.segs[NVMM_X64_SEG_IDT], 0, 0); 89 init_seg(&state.segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 90 init_seg(&state.segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 91 92 /* Protected mode enabled. */ 93 state.crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 94 95 /* 64bit mode enabled. */ 96 state.crs[NVMM_X64_CR_CR4] = CR4_PAE; 97 state.msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 98 99 /* Stolen from x86/pmap.c */ 100 #define PATENTRY(n, type) (type << ((n) * 8)) 101 #define PAT_UC 0x0ULL 102 #define PAT_WC 0x1ULL 103 #define PAT_WT 0x4ULL 104 #define PAT_WP 0x5ULL 105 #define PAT_WB 0x6ULL 106 #define PAT_UCMINUS 0x7ULL 107 state.msrs[NVMM_X64_MSR_PAT] = 108 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 109 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 110 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 111 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 112 113 /* Page tables. */ 114 state.crs[NVMM_X64_CR_CR3] = 0x3000; 115 116 state.gprs[NVMM_X64_GPR_RIP] = 0x2000; 117 118 if (nvmm_vcpu_setstate(mach, 0, &state, NVMM_X64_STATE_ALL) == -1) 119 err(errno, "nvmm_vcpu_setstate"); 120 } 121 122 static void 123 map_pages(struct nvmm_machine *mach) 124 { 125 pt_entry_t *L4, *L3, *L2, *L1; 126 127 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 128 -1, 0); 129 if (instbuf == MAP_FAILED) 130 err(errno, "mmap"); 131 132 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 133 err(errno, "nvmm_hva_map"); 134 if (nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 0) == -1) 135 err(errno, "nvmm_gpa_map"); 136 137 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 138 -1, 0); 139 if (L4 == MAP_FAILED) 140 err(errno, "mmap"); 141 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 142 -1, 0); 143 if (L3 == MAP_FAILED) 144 err(errno, "mmap"); 145 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 146 -1, 0); 147 if (L2 == MAP_FAILED) 148 err(errno, "mmap"); 149 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 150 -1, 0); 151 if (L1 == MAP_FAILED) 152 err(errno, "mmap"); 153 154 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 155 err(errno, "nvmm_hva_map"); 156 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 157 err(errno, "nvmm_hva_map"); 158 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 159 err(errno, "nvmm_hva_map"); 160 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 161 err(errno, "nvmm_hva_map"); 162 163 if (nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 0) == -1) 164 err(errno, "nvmm_gpa_map"); 165 if (nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 0) == -1) 166 err(errno, "nvmm_gpa_map"); 167 if (nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 0) == -1) 168 err(errno, "nvmm_gpa_map"); 169 if (nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 0) == -1) 170 err(errno, "nvmm_gpa_map"); 171 172 memset(L4, 0, PAGE_SIZE); 173 memset(L3, 0, PAGE_SIZE); 174 memset(L2, 0, PAGE_SIZE); 175 memset(L1, 0, PAGE_SIZE); 176 177 L4[0] = PTE_P | PTE_W | 0x4000; 178 L3[0] = PTE_P | PTE_W | 0x5000; 179 L2[0] = PTE_P | PTE_W | 0x6000; 180 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 181 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 182 } 183 184 /* -------------------------------------------------------------------------- */ 185 186 static void 187 mem_callback(struct nvmm_mem *mem) 188 { 189 size_t off; 190 191 if (mem->gpa < 0x1000 || mem->gpa + mem->size > 0x1000 + PAGE_SIZE) { 192 printf("Out of page\n"); 193 exit(-1); 194 } 195 196 off = mem->gpa - 0x1000; 197 198 printf("-> gpa = %p\n", (void *)mem->gpa); 199 200 if (mem->write) { 201 memcpy(mmiobuf + off, mem->data, mem->size); 202 } else { 203 memcpy(mem->data, mmiobuf + off, mem->size); 204 } 205 } 206 207 static int 208 handle_memory(struct nvmm_machine *mach, struct nvmm_exit *exit) 209 { 210 int ret; 211 212 ret = nvmm_assist_mem(mach, 0, exit); 213 if (ret == -1) { 214 err(errno, "nvmm_assist_mem"); 215 } 216 217 return 0; 218 } 219 220 static void 221 run_machine(struct nvmm_machine *mach) 222 { 223 struct nvmm_exit exit; 224 225 while (1) { 226 if (nvmm_vcpu_run(mach, 0, &exit) == -1) 227 err(errno, "nvmm_vcpu_run"); 228 229 switch (exit.reason) { 230 case NVMM_EXIT_NONE: 231 break; 232 233 case NVMM_EXIT_MSR: 234 /* Stop here. */ 235 return; 236 237 case NVMM_EXIT_MEMORY: 238 handle_memory(mach, &exit); 239 break; 240 241 case NVMM_EXIT_SHUTDOWN: 242 printf("Shutting down!\n"); 243 return; 244 245 default: 246 printf("Invalid!\n"); 247 return; 248 } 249 } 250 } 251 252 /* -------------------------------------------------------------------------- */ 253 254 struct test { 255 const char *name; 256 uint8_t *code_begin; 257 uint8_t *code_end; 258 uint64_t wanted; 259 }; 260 261 static void 262 run_test(struct nvmm_machine *mach, const struct test *test) 263 { 264 uint64_t *res; 265 size_t size; 266 267 size = (size_t)test->code_end - (size_t)test->code_begin; 268 269 reset_machine(mach); 270 271 memset(mmiobuf, 0, PAGE_SIZE); 272 memcpy(instbuf, test->code_begin, size); 273 274 run_machine(mach); 275 276 res = (uint64_t *)mmiobuf; 277 if (*res == test->wanted) { 278 printf("Test '%s' passed\n", test->name); 279 } else { 280 printf("Test '%s' failed, wanted 0x%lx, got 0x%lx\n", test->name, 281 test->wanted, *res); 282 } 283 } 284 285 /* -------------------------------------------------------------------------- */ 286 287 extern uint8_t test1_begin, test1_end; 288 extern uint8_t test2_begin, test2_end; 289 extern uint8_t test3_begin, test3_end; 290 extern uint8_t test4_begin, test4_end; 291 extern uint8_t test5_begin, test5_end; 292 extern uint8_t test6_begin, test6_end; 293 extern uint8_t test7_begin, test7_end; 294 extern uint8_t test8_begin, test8_end; 295 extern uint8_t test9_begin, test9_end; 296 extern uint8_t test10_begin, test10_end; 297 extern uint8_t test11_begin, test11_end; 298 extern uint8_t test12_begin, test12_end; 299 extern uint8_t test13_begin, test13_end; 300 extern uint8_t test14_begin, test14_end; 301 302 static const struct test tests[] = { 303 { "test1 - MOV", &test1_begin, &test1_end, 0x3004 }, 304 { "test2 - OR", &test2_begin, &test2_end, 0x16FF }, 305 { "test3 - AND", &test3_begin, &test3_end, 0x1FC0 }, 306 { "test4 - XOR", &test4_begin, &test4_end, 0x10CF }, 307 { "test5 - Address Sizes", &test5_begin, &test5_end, 0x1F00 }, 308 { "test6 - DMO", &test6_begin, &test6_end, 0xFFAB }, 309 { "test7 - STOS", &test7_begin, &test7_end, 0x00123456 }, 310 { "test8 - LODS", &test8_begin, &test8_end, 0x12345678 }, 311 { "test9 - MOVS", &test9_begin, &test9_end, 0x12345678 }, 312 { "test10 - MOVZXB", &test10_begin, &test10_end, 0x00000078 }, 313 { "test11 - MOVZXW", &test11_begin, &test11_end, 0x00005678 }, 314 { "test12 - CMP", &test12_begin, &test12_end, 0x00000001 }, 315 { "test13 - SUB", &test13_begin, &test13_end, 0x0000000F0000A0FF }, 316 { "test14 - TEST", &test14_begin, &test14_end, 0x00000001 }, 317 { NULL, NULL, NULL, -1 } 318 }; 319 320 static const struct nvmm_callbacks callbacks = { 321 .io = NULL, 322 .mem = mem_callback 323 }; 324 325 /* 326 * 0x1000: MMIO address, unmapped 327 * 0x2000: Instructions, mapped 328 * 0x3000: L4 329 * 0x4000: L3 330 * 0x5000: L2 331 * 0x6000: L1 332 */ 333 int main(int argc, char *argv[]) 334 { 335 struct nvmm_machine mach; 336 size_t i; 337 338 if (nvmm_machine_create(&mach) == -1) 339 err(errno, "nvmm_machine_create"); 340 if (nvmm_vcpu_create(&mach, 0) == -1) 341 err(errno, "nvmm_vcpu_create"); 342 nvmm_callbacks_register(&callbacks); 343 map_pages(&mach); 344 345 for (i = 0; tests[i].name != NULL; i++) { 346 run_test(&mach, &tests[i]); 347 } 348 349 return 0; 350 } 351
Indexes created Wed Sep 24 05:09:52 GMT 2025