h_io_assist.c revision 1.4
1 /* $NetBSD: h_io_assist.c,v 1.4 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 #define IO_SIZE 128 51 52 static char iobuf[IO_SIZE]; 53 54 static char *databuf; 55 static uint8_t *instbuf; 56 57 static void 58 init_seg(struct nvmm_x64_state_seg *seg, int type, int sel) 59 { 60 seg->selector = sel; 61 seg->attrib.type = type; 62 seg->attrib.s = (type & 0b10000) != 0; 63 seg->attrib.dpl = 0; 64 seg->attrib.p = 1; 65 seg->attrib.avl = 1; 66 seg->attrib.l = 1; 67 seg->attrib.def = 0; 68 seg->attrib.g = 1; 69 seg->limit = 0x0000FFFF; 70 seg->base = 0x00000000; 71 } 72 73 static void 74 reset_machine(struct nvmm_machine *mach) 75 { 76 struct nvmm_x64_state state; 77 78 memset(&state, 0, sizeof(state)); 79 80 /* Default. */ 81 state.gprs[NVMM_X64_GPR_RFLAGS] = PSL_MBO; 82 init_seg(&state.segs[NVMM_X64_SEG_CS], SDT_MEMERA, GSEL(GCODE_SEL, SEL_KPL)); 83 init_seg(&state.segs[NVMM_X64_SEG_SS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 84 init_seg(&state.segs[NVMM_X64_SEG_DS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 85 init_seg(&state.segs[NVMM_X64_SEG_ES], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 86 init_seg(&state.segs[NVMM_X64_SEG_FS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 87 init_seg(&state.segs[NVMM_X64_SEG_GS], SDT_MEMRWA, GSEL(GDATA_SEL, SEL_KPL)); 88 89 /* Blank. */ 90 init_seg(&state.segs[NVMM_X64_SEG_GDT], 0, 0); 91 init_seg(&state.segs[NVMM_X64_SEG_IDT], 0, 0); 92 init_seg(&state.segs[NVMM_X64_SEG_LDT], SDT_SYSLDT, 0); 93 init_seg(&state.segs[NVMM_X64_SEG_TR], SDT_SYS386BSY, 0); 94 95 /* Protected mode enabled. */ 96 state.crs[NVMM_X64_CR_CR0] = CR0_PG|CR0_PE|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM; 97 98 /* 64bit mode enabled. */ 99 state.crs[NVMM_X64_CR_CR4] = CR4_PAE; 100 state.msrs[NVMM_X64_MSR_EFER] = EFER_LME | EFER_SCE | EFER_LMA; 101 102 /* Stolen from x86/pmap.c */ 103 #define PATENTRY(n, type) (type << ((n) * 8)) 104 #define PAT_UC 0x0ULL 105 #define PAT_WC 0x1ULL 106 #define PAT_WT 0x4ULL 107 #define PAT_WP 0x5ULL 108 #define PAT_WB 0x6ULL 109 #define PAT_UCMINUS 0x7ULL 110 state.msrs[NVMM_X64_MSR_PAT] = 111 PATENTRY(0, PAT_WB) | PATENTRY(1, PAT_WT) | 112 PATENTRY(2, PAT_UCMINUS) | PATENTRY(3, PAT_UC) | 113 PATENTRY(4, PAT_WB) | PATENTRY(5, PAT_WT) | 114 PATENTRY(6, PAT_UCMINUS) | PATENTRY(7, PAT_UC); 115 116 /* Page tables. */ 117 state.crs[NVMM_X64_CR_CR3] = 0x3000; 118 119 state.gprs[NVMM_X64_GPR_RIP] = 0x2000; 120 121 if (nvmm_vcpu_setstate(mach, 0, &state, NVMM_X64_STATE_ALL) == -1) 122 err(errno, "nvmm_vcpu_setstate"); 123 } 124 125 static void 126 map_pages(struct nvmm_machine *mach) 127 { 128 pt_entry_t *L4, *L3, *L2, *L1; 129 130 instbuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 131 -1, 0); 132 if (instbuf == MAP_FAILED) 133 err(errno, "mmap"); 134 databuf = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 135 -1, 0); 136 if (databuf == MAP_FAILED) 137 err(errno, "mmap"); 138 139 if (nvmm_hva_map(mach, (uintptr_t)instbuf, PAGE_SIZE) == -1) 140 err(errno, "nvmm_hva_map"); 141 if (nvmm_hva_map(mach, (uintptr_t)databuf, PAGE_SIZE) == -1) 142 err(errno, "nvmm_hva_map"); 143 if (nvmm_gpa_map(mach, (uintptr_t)instbuf, 0x2000, PAGE_SIZE, 0) == -1) 144 err(errno, "nvmm_gpa_map"); 145 if (nvmm_gpa_map(mach, (uintptr_t)databuf, 0x1000, PAGE_SIZE, 0) == -1) 146 err(errno, "nvmm_gpa_map"); 147 148 L4 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 149 -1, 0); 150 if (L4 == MAP_FAILED) 151 err(errno, "mmap"); 152 L3 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 153 -1, 0); 154 if (L3 == MAP_FAILED) 155 err(errno, "mmap"); 156 L2 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 157 -1, 0); 158 if (L2 == MAP_FAILED) 159 err(errno, "mmap"); 160 L1 = mmap(NULL, PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, 161 -1, 0); 162 if (L1 == MAP_FAILED) 163 err(errno, "mmap"); 164 165 if (nvmm_hva_map(mach, (uintptr_t)L4, PAGE_SIZE) == -1) 166 err(errno, "nvmm_hva_map"); 167 if (nvmm_hva_map(mach, (uintptr_t)L3, PAGE_SIZE) == -1) 168 err(errno, "nvmm_hva_map"); 169 if (nvmm_hva_map(mach, (uintptr_t)L2, PAGE_SIZE) == -1) 170 err(errno, "nvmm_hva_map"); 171 if (nvmm_hva_map(mach, (uintptr_t)L1, PAGE_SIZE) == -1) 172 err(errno, "nvmm_hva_map"); 173 174 if (nvmm_gpa_map(mach, (uintptr_t)L4, 0x3000, PAGE_SIZE, 0) == -1) 175 err(errno, "nvmm_gpa_map"); 176 if (nvmm_gpa_map(mach, (uintptr_t)L3, 0x4000, PAGE_SIZE, 0) == -1) 177 err(errno, "nvmm_gpa_map"); 178 if (nvmm_gpa_map(mach, (uintptr_t)L2, 0x5000, PAGE_SIZE, 0) == -1) 179 err(errno, "nvmm_gpa_map"); 180 if (nvmm_gpa_map(mach, (uintptr_t)L1, 0x6000, PAGE_SIZE, 0) == -1) 181 err(errno, "nvmm_gpa_map"); 182 183 memset(L4, 0, PAGE_SIZE); 184 memset(L3, 0, PAGE_SIZE); 185 memset(L2, 0, PAGE_SIZE); 186 memset(L1, 0, PAGE_SIZE); 187 188 L4[0] = PTE_P | PTE_W | 0x4000; 189 L3[0] = PTE_P | PTE_W | 0x5000; 190 L2[0] = PTE_P | PTE_W | 0x6000; 191 L1[0x2000 / PAGE_SIZE] = PTE_P | PTE_W | 0x2000; 192 L1[0x1000 / PAGE_SIZE] = PTE_P | PTE_W | 0x1000; 193 } 194 195 /* -------------------------------------------------------------------------- */ 196 197 static size_t iobuf_off = 0; 198 199 static void 200 io_callback(struct nvmm_io *io) 201 { 202 if (io->port != 123) { 203 printf("Wrong port\n"); 204 exit(-1); 205 } 206 207 if (io->in) { 208 memcpy(io->data, iobuf + iobuf_off, io->size); 209 } else { 210 memcpy(iobuf + iobuf_off, io->data, io->size); 211 } 212 iobuf_off += io->size; 213 214 } 215 216 static int 217 handle_io(struct nvmm_machine *mach, struct nvmm_exit *exit) 218 { 219 int ret; 220 221 ret = nvmm_assist_io(mach, 0, exit); 222 if (ret == -1) { 223 err(errno, "nvmm_assist_io"); 224 } 225 226 return 0; 227 } 228 229 static void 230 run_machine(struct nvmm_machine *mach) 231 { 232 struct nvmm_exit exit; 233 234 while (1) { 235 if (nvmm_vcpu_run(mach, 0, &exit) == -1) 236 err(errno, "nvmm_vcpu_run"); 237 238 switch (exit.reason) { 239 case NVMM_EXIT_NONE: 240 break; 241 242 case NVMM_EXIT_MSR: 243 /* Stop here. */ 244 return; 245 246 case NVMM_EXIT_IO: 247 handle_io(mach, &exit); 248 break; 249 250 case NVMM_EXIT_SHUTDOWN: 251 printf("Shutting down!\n"); 252 return; 253 254 default: 255 printf("Invalid!\n"); 256 return; 257 } 258 } 259 } 260 261 /* -------------------------------------------------------------------------- */ 262 263 struct test { 264 const char *name; 265 uint8_t *code_begin; 266 uint8_t *code_end; 267 const char *wanted; 268 bool in; 269 }; 270 271 static void 272 run_test(struct nvmm_machine *mach, const struct test *test) 273 { 274 size_t size; 275 char *res; 276 277 size = (size_t)test->code_end - (size_t)test->code_begin; 278 279 reset_machine(mach); 280 281 iobuf_off = 0; 282 memset(iobuf, 0, IO_SIZE); 283 memset(databuf, 0, PAGE_SIZE); 284 memcpy(instbuf, test->code_begin, size); 285 286 if (test->in) { 287 strcpy(iobuf, test->wanted); 288 } else { 289 strcpy(databuf, test->wanted); 290 } 291 292 run_machine(mach); 293 294 if (test->in) { 295 res = databuf; 296 } else { 297 res = iobuf; 298 } 299 300 if (!strcmp(res, test->wanted)) { 301 printf("Test '%s' passed\n", test->name); 302 } else { 303 printf("Test '%s' failed, wanted '%s', got '%s'\n", test->name, 304 test->wanted, res); 305 } 306 } 307 308 /* -------------------------------------------------------------------------- */ 309 310 extern uint8_t test1_begin, test1_end; 311 extern uint8_t test2_begin, test2_end; 312 extern uint8_t test3_begin, test3_end; 313 extern uint8_t test4_begin, test4_end; 314 extern uint8_t test5_begin, test5_end; 315 extern uint8_t test6_begin, test6_end; 316 extern uint8_t test7_begin, test7_end; 317 extern uint8_t test8_begin, test8_end; 318 extern uint8_t test9_begin, test9_end; 319 extern uint8_t test10_begin, test10_end; 320 extern uint8_t test11_begin, test11_end; 321 extern uint8_t test12_begin, test12_end; 322 323 static const struct test tests[] = { 324 { "test1 - INB", &test1_begin, &test1_end, "12", true }, 325 { "test2 - INW", &test2_begin, &test2_end, "1234", true }, 326 { "test3 - INL", &test3_begin, &test3_end, "12345678", true }, 327 { "test4 - INSB+REP", &test4_begin, &test4_end, "12345", true }, 328 { "test5 - INSW+REP", &test5_begin, &test5_end, 329 "Comment est votre blanquette", true }, 330 { "test6 - INSL+REP", &test6_begin, &test6_end, 331 "123456789abcdefghijklmnopqrs", true }, 332 { "test7 - OUTB", &test7_begin, &test7_end, "12", false }, 333 { "test8 - OUTW", &test8_begin, &test8_end, "1234", false }, 334 { "test9 - OUTL", &test9_begin, &test9_end, "12345678", false }, 335 { "test10 - OUTSB+REP", &test10_begin, &test10_end, "12345", false }, 336 { "test11 - OUTSW+REP", &test11_begin, &test11_end, 337 "Ah, Herr Bramard", false }, 338 { "test12 - OUTSL+REP", &test12_begin, &test12_end, 339 "123456789abcdefghijklmnopqrs", false }, 340 { NULL, NULL, NULL, NULL, false } 341 }; 342 343 static const struct nvmm_callbacks callbacks = { 344 .io = io_callback, 345 .mem = NULL 346 }; 347 348 /* 349 * 0x1000: Data, mapped 350 * 0x2000: Instructions, mapped 351 * 0x3000: L4 352 * 0x4000: L3 353 * 0x5000: L2 354 * 0x6000: L1 355 */ 356 int main(int argc, char *argv[]) 357 { 358 struct nvmm_machine mach; 359 size_t i; 360 361 if (nvmm_machine_create(&mach) == -1) 362 err(errno, "nvmm_machine_create"); 363 if (nvmm_vcpu_create(&mach, 0) == -1) 364 err(errno, "nvmm_vcpu_create"); 365 nvmm_callbacks_register(&callbacks); 366 map_pages(&mach); 367 368 for (i = 0; tests[i].name != NULL; i++) { 369 run_test(&mach, &tests[i]); 370 } 371 372 return 0; 373 } 374
Indexes created Fri Sep 26 20:09:58 GMT 2025