1 #include <palacios/vmm_mem.h>
2 #include <palacios/vmm.h>
3 #include <palacios/vmcb.h>
4 #include <palacios/vmm_decoder.h>
5 #include <palacios/vm_guest_mem.h>
6 #include <palacios/vmm_ctrl_regs.h>
10 extern void SerialMemDump(unsigned char *start, int n);
12 /* Segmentation is a problem here...
14 * When we get a memory operand, presumably we use the default segment (which is?)
15 * unless an alternate segment was specfied in the prefix...
19 int handle_cr0_write(struct guest_info * info) {
23 switch (info->cpu_mode) {
29 PrintDebug("Real Mode write to CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs)));
31 // The real rip address is actually a combination of the rip + CS base
32 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
34 // I think we should inject a GPF into the guest
35 PrintDebug("Could not read instruction (ret=%d)\n", ret);
39 while (is_prefix_byte(instr[index])) {
43 if ((instr[index] == cr_access_byte) &&
44 (instr[index + 1] == lmsw_byte) &&
45 (MODRM_REG(instr[index + 2]) == lmsw_reg_byte)) {
48 addr_t second_operand;
49 struct cr0_real *real_cr0;
50 struct cr0_real *new_cr0;
51 operand_type_t addr_type;
57 real_cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0);
59 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16);
62 if (addr_type == REG_OPERAND) {
63 new_cr0 = (struct cr0_real *)first_operand;
64 } else if (addr_type == MEM_OPERAND) {
67 if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) {
72 new_cr0 = (struct cr0_real *)host_addr;
74 PrintDebug("Memory operand in real mode write to CR0 is UNIMPLEMENTED\n");
75 // error... don't know what to do
79 if ((new_cr0->pe == 1) && (real_cr0->pe == 0)) {
80 info->cpu_mode = PROTECTED;
81 } else if ((new_cr0->pe == 0) && (real_cr0->pe == 1)) {
82 info->cpu_mode = REAL;
85 new_cr0_val = *(char*)(new_cr0) & 0x0f;
88 if (info->shdw_pg_mode == SHADOW_PAGING) {
89 struct cr0_real * shadow_cr0 = (struct cr0_real*)&(info->shdw_pg_state.guest_cr0);
91 PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
92 /* struct cr0_real is only 4 bits wide,
93 * so we can overwrite the real_cr0 without worrying about the shadow fields
95 *(char*)real_cr0 &= 0xf0;
96 *(char*)real_cr0 |= new_cr0_val;
98 *(char*)shadow_cr0 &= 0xf0;
99 *(char*)shadow_cr0 |= new_cr0_val;
101 PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
103 PrintDebug("Old CR0=%x\n", *real_cr0);
104 // for now we just pass through....
105 *(char*)real_cr0 &= 0xf0;
106 *(char*)real_cr0 |= new_cr0_val;
108 PrintDebug("New CR0=%x\n", *real_cr0);
114 } else if ((instr[index] == cr_access_byte) &&
115 (instr[index + 1] == clts_byte)) {
117 PrintDebug("CLTS unhandled in CR0 write\n");
120 } else if ((instr[index] == cr_access_byte) &&
121 (instr[index + 1] = mov_to_cr_byte)) {
122 addr_t first_operand;
123 addr_t second_operand;
124 struct cr0_32 *real_cr0;
125 struct cr0_32 *new_cr0;
126 operand_type_t addr_type;
131 real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
133 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
135 if (addr_type != REG_OPERAND) {
136 PrintDebug("Moving to CR0 from non-register operand in CR0 write\n");
137 /* Mov to CR0 Can only be a 32 bit register */
142 new_cr0 = (struct cr0_32 *)first_operand;
144 if (new_cr0->pe == 1) {
145 PrintDebug("Entering Protected Mode\n");
146 info->cpu_mode = PROTECTED;
149 if (new_cr0->pg == 1) {
150 PrintDebug("Paging is already turned on in switch to protected mode in CR0 write\n");
156 if (info->shdw_pg_mode == SHADOW_PAGING) {
157 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
159 PrintDebug("Old CR0=%x, Old Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
160 *real_cr0 = *new_cr0;
163 *shadow_cr0 = *new_cr0;
165 PrintDebug("New CR0=%x, New Shadow CR0=%x\n", *real_cr0, *shadow_cr0);
167 PrintDebug("Old CR0=%x\n", *real_cr0);
168 *real_cr0 = *new_cr0;
169 PrintDebug("New CR0=%x\n", *real_cr0);
175 PrintDebug("Unsupported Instruction\n");
176 // unsupported instruction, UD the guest
189 PrintDebug("Protected %s Mode write to CR0 at guest %s linear rip 0x%x\n",
190 info->mem_mode == VIRTUAL_MEM ? "Paged" : "",
191 info->mem_mode == VIRTUAL_MEM ? "virtual" : "",
192 get_addr_linear(info, info->rip, &(info->segments.cs)));
194 // OK, now we will read the instruction
195 // The only difference between PROTECTED and PROTECTED_PG is whether we read
196 // from guest_pa or guest_va
197 if (info->mem_mode == PHYSICAL_MEM) {
198 // The real rip address is actually a combination of the rip + CS base
199 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
201 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
205 // I think we should inject a GPF into the guest
206 PrintDebug("Could not read instruction (ret=%d)\n", ret);
210 while (is_prefix_byte(instr[index])) {
214 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
216 struct cr0_32 * real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
218 if ((instr[index] == cr_access_byte) &&
219 (instr[index + 1] == mov_to_cr_byte)) {
223 addr_t first_operand;
224 addr_t second_operand;
225 struct cr0_32 *new_cr0;
226 operand_type_t addr_type;
231 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
233 if (addr_type != REG_OPERAND) {
234 PrintDebug("Non-register operand in write to CR0\n");
238 new_cr0 = (struct cr0_32 *)first_operand;
242 if (info->shdw_pg_mode == SHADOW_PAGING) {
243 struct cr0_32 * shadow_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
245 if (new_cr0->pg == 1){
246 // This should be new_cr0->pg && !(old_cr->pg), right?
247 // and then a case for turning paging off?
249 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
251 info->mem_mode = VIRTUAL_MEM;
253 *shadow_cr0 = *new_cr0;
254 *real_cr0 = *new_cr0;
257 // Activate Shadow Paging
259 PrintDebug("Turning on paging in the guest\n");
261 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
264 } else if (new_cr0->pe == 0) {
265 info->cpu_mode = REAL;
267 *shadow_cr0 = *new_cr0;
268 *real_cr0 = *new_cr0;
274 *real_cr0 = *new_cr0;
279 } else if ((instr[index] == 0x0f) &&
280 (instr[index + 1] == 0x06)) {
282 PrintDebug("CLTS instruction - clearing TS flag of real and shadow CR0\n");
291 PrintDebug("Unkown instruction: \n");
292 SerialMemDump(instr,15);
299 PrintDebug("Protected PAE Mode write to CR0 is UNIMPLEMENTED\n");
303 PrintDebug("Protected Long Mode write to CR0 is UNIMPLEMENTED\n");
308 PrintDebug("Unknown Mode write to CR0 (info->cpu_mode=0x%x\n)",info->cpu_mode);
319 int handle_cr0_read(struct guest_info * info) {
322 switch (info->cpu_mode) {
330 PrintDebug("Real Mode read from CR0 at linear guest pa 0x%x\n",get_addr_linear(info,info->rip,&(info->segments.cs)));
332 // The real rip address is actually a combination of the rip + CS base
333 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
335 // I think we should inject a GPF into the guest
336 PrintDebug("Could not read Real Mode instruction (ret=%d)\n", ret);
341 while (is_prefix_byte(instr[index])) {
345 if ((instr[index] == cr_access_byte) &&
346 (instr[index + 1] == smsw_byte) &&
347 (MODRM_REG(instr[index + 2]) == smsw_reg_byte)) {
349 // SMSW (store machine status word)
351 addr_t first_operand;
352 addr_t second_operand;
353 struct cr0_real *cr0;
354 operand_type_t addr_type;
359 cr0 = (struct cr0_real*)&(info->ctrl_regs.cr0);
362 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG16);
364 if (addr_type == MEM_OPERAND) {
367 if (guest_pa_to_host_va(info, first_operand + (info->segments.ds.base << 4), &host_addr) == -1) {
369 PrintDebug("Could not convert guest physical address to host virtual address\n");
373 first_operand = host_addr;
379 cr0_val = *(char*)cr0 & 0x0f;
381 *(char *)first_operand &= 0xf0;
382 *(char *)first_operand |= cr0_val;
384 PrintDebug("index = %d, rip = %x\n", index, (ulong_t)(info->rip));
386 PrintDebug("new_rip = %x\n", (ulong_t)(info->rip));
389 } else if ((instr[index] == cr_access_byte) &&
390 (instr[index+1] == mov_from_cr_byte)) {
392 * This can only take a 32 bit register argument in anything less than 64 bit mode.
394 addr_t first_operand;
395 addr_t second_operand;
396 operand_type_t addr_type;
398 struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
402 addr_type = decode_operands16(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
404 struct cr0_32 * virt_cr0 = (struct cr0_32 *)first_operand;
406 if (addr_type != REG_OPERAND) {
407 // invalid opcode to guest
408 PrintDebug("Invalid operand type in mov from CR0\n");
412 if (info->shdw_pg_mode == SHADOW_PAGING) {
413 *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
415 *virt_cr0 = *real_cr0;
421 PrintDebug("Unknown read instr from CR0\n");
435 PrintDebug("Protected %s Mode read from CR0 at guest %s linear rip 0x%x\n",
436 info->mem_mode == VIRTUAL_MEM ? "Paged" : "",
437 info->mem_mode == VIRTUAL_MEM ? "virtual" : "",
438 get_addr_linear(info, info->rip, &(info->segments.cs)));
440 // We need to read the instruction, which is at CS:IP, but that
441 // linear address is guest physical without PG and guest virtual with PG
442 if (info->cpu_mode == PHYSICAL_MEM) {
443 // The real rip address is actually a combination of the rip + CS base
444 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
446 // The real rip address is actually a combination of the rip + CS base
447 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
451 // I think we should inject a GPF into the guest
452 PrintDebug("Could not read Protected %s mode instruction (ret=%d)\n",
453 info->cpu_mode == VIRTUAL_MEM ? "Paged" : "", ret);
457 while (is_prefix_byte(instr[index])) {
462 if ((instr[index] == cr_access_byte) &&
463 (instr[index+1] == mov_from_cr_byte)) {
465 // MOV from CR0 to register
467 addr_t first_operand;
468 addr_t second_operand;
469 operand_type_t addr_type;
470 struct cr0_32 * virt_cr0;
471 struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
475 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
477 if (addr_type != REG_OPERAND) {
478 PrintDebug("Invalid operand type in mov from CR0\n");
482 virt_cr0 = (struct cr0_32 *)first_operand;
484 if (info->shdw_pg_mode == SHADOW_PAGING) {
485 *virt_cr0 = *(struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
487 *virt_cr0 = *real_cr0;
493 PrintDebug("Unknown read instruction from CR0\n");
500 PrintDebug("Protected PAE Mode read to CR0 is UNIMPLEMENTED\n");
504 PrintDebug("Protected Long Mode read to CR0 is UNIMPLEMENTED\n");
510 PrintDebug("Unknown Mode read from CR0 (info->cpu_mode=0x%x)\n",info->cpu_mode);
523 int handle_cr3_write(struct guest_info * info) {
524 if (info->cpu_mode == PROTECTED) {
530 // We need to read the instruction, which is at CS:IP, but that
531 // linear address is guest physical without PG and guest virtual with PG
532 if (info->cpu_mode == PHYSICAL_MEM) {
533 // The real rip address is actually a combination of the rip + CS base
534 PrintDebug("Writing Guest CR3 Write (Physical Address)\n");
535 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
537 PrintDebug("Writing Guest CR3 Write (Virtual Address)\n");
538 // The real rip address is actually a combination of the rip + CS base
539 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
544 PrintDebug("Could not read instruction (ret=%d)\n", ret);
548 while (is_prefix_byte(instr[index])) {
552 if ((instr[index] == cr_access_byte) &&
553 (instr[index + 1] == mov_to_cr_byte)) {
555 addr_t first_operand;
556 addr_t second_operand;
557 struct cr3_32 * new_cr3;
558 // struct cr3_32 * real_cr3;
559 operand_type_t addr_type;
563 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
565 if (addr_type != REG_OPERAND) {
566 /* Mov to CR3 can only be a 32 bit register */
570 new_cr3 = (struct cr3_32 *)first_operand;
572 if (info->shdw_pg_mode == SHADOW_PAGING) {
574 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
575 struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
578 /* Delete the current Page Tables */
579 delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3));
582 *guest_cr3 = *new_cr3;
584 // Something like this
585 shadow_pt = create_new_shadow_pt32(info);
586 //shadow_pt = setup_shadow_pt32(info, CR3_TO_PDE32(*(addr_t *)new_cr3));
589 /* Copy Various flags */
590 *shadow_cr3 = *new_cr3;
592 shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt);
594 if (info->mem_mode == VIRTUAL_MEM) {
595 // If we aren't in paged mode then we have to preserve the identity mapped CR3
596 info->ctrl_regs.cr3 = *(addr_t*)shadow_cr3;
603 PrintDebug("Unknown Instruction\n");
607 PrintDebug("Invalid operating Mode\n");
617 int handle_cr3_read(struct guest_info * info) {
618 if (info->cpu_mode == PROTECTED) {
624 // We need to read the instruction, which is at CS:IP, but that
625 // linear address is guest physical without PG and guest virtual with PG
626 if (info->cpu_mode == PHYSICAL_MEM) {
627 // The real rip address is actually a combination of the rip + CS base
628 ret = read_guest_pa_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
630 // The real rip address is actually a combination of the rip + CS base
631 ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
635 PrintDebug("Could not read instruction (ret=%d)\n", ret);
639 while (is_prefix_byte(instr[index])) {
643 if ((instr[index] == cr_access_byte) &&
644 (instr[index + 1] == mov_from_cr_byte)) {
645 addr_t first_operand;
646 addr_t second_operand;
647 struct cr3_32 * virt_cr3;
648 struct cr3_32 * real_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
649 operand_type_t addr_type;
653 addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
655 if (addr_type != REG_OPERAND) {
656 /* Mov to CR3 can only be a 32 bit register */
660 virt_cr3 = (struct cr3_32 *)first_operand;
662 if (info->shdw_pg_mode == SHADOW_PAGING) {
663 *virt_cr3 = *(struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
665 *virt_cr3 = *real_cr3;
670 PrintDebug("Unknown Instruction\n");
674 PrintDebug("Invalid operating Mode\n");