1 #include <geekos/svm.h>
2 #include <geekos/vmm.h>
4 #include <geekos/vmcb.h>
5 #include <geekos/vmm_mem.h>
6 #include <geekos/vmm_paging.h>
7 #include <geekos/svm_handler.h>
9 #include <geekos/vmm_debug.h>
12 /* TEMPORARY BECAUSE SVM IS WEIRD */
13 #include <geekos/tss.h>
16 extern struct vmm_os_hooks * os_hooks;
18 extern uint_t cpuid_ecx(uint_t op);
19 extern uint_t cpuid_edx(uint_t op);
20 extern void Get_MSR(uint_t MSR, uint_t * high_byte, uint_t * low_byte);
21 extern void Set_MSR(uint_t MSR, uint_t high_byte, uint_t low_byte);
22 extern uint_t launch_svm(vmcb_t * vmcb_addr);
23 extern void safe_svm_launch(vmcb_t * vmcb_addr, struct guest_gprs * gprs);
25 extern uint_t Get_CR3();
27 extern void GetGDTR(void * gdt);
28 extern void GetIDTR(void * idt);
30 extern void DisableInts();
32 /* Checks machine SVM capability */
33 /* Implemented from: AMD Arch Manual 3, sect 15.4 */
34 int is_svm_capable() {
35 uint_t ret = cpuid_ecx(CPUID_FEATURE_IDS);
36 uint_t vm_cr_low = 0, vm_cr_high = 0;
39 if ((ret & CPUID_FEATURE_IDS_ecx_svm_avail) == 0) {
40 PrintDebug("SVM Not Available\n");
44 Get_MSR(SVM_VM_CR_MSR, &vm_cr_high, &vm_cr_low);
46 if ((vm_cr_low & SVM_VM_CR_MSR_svmdis) == 0) {
50 ret = cpuid_edx(CPUID_SVM_REV_AND_FEATURE_IDS);
53 if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_np) == 0) {
54 PrintDebug("Nested Paging not supported\n");
57 if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_svml) == 0) {
58 PrintDebug("SVM BIOS Disabled, not unlockable\n");
60 PrintDebug("SVM is locked with a key\n");
68 void Init_SVM(struct vmm_ctrl_ops * vmm_ops) {
73 // Enable SVM on the CPU
74 Get_MSR(EFER_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
75 msr.e_reg.low |= EFER_MSR_svm_enable;
76 Set_MSR(EFER_MSR, 0, msr.e_reg.low);
78 PrintDebug("SVM Enabled\n");
81 // Setup the host state save area
82 host_state = os_hooks->allocate_pages(4);
85 msr.e_reg.low = (uint_t)host_state;
88 PrintDebug("Host State being saved at %x\n", (uint_t)host_state);
89 Set_MSR(SVM_VM_HSAVE_PA_MSR, msr.e_reg.high, msr.e_reg.low);
93 // Setup the SVM specific vmm operations
94 vmm_ops->init_guest = &init_svm_guest;
95 vmm_ops->start_guest = &start_svm_guest;
102 int init_svm_guest(struct guest_info *info) {
104 PrintDebug("Allocating VMCB\n");
105 info->vmm_data = (void*)Allocate_VMCB();
108 //PrintDebug("Generating Guest nested page tables\n");
109 // info->page_tables = NULL;
110 //info->page_tables = generate_guest_page_tables_64(&(info->mem_layout), &(info->mem_list));
111 //info->page_tables = generate_guest_page_tables(&(info->mem_layout), &(info->mem_list));
112 //PrintDebugPageTables(info->page_tables);
116 PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
117 Init_VMCB((vmcb_t*)(info->vmm_data), *info);
120 info->vm_regs.rbx = 0;
121 info->vm_regs.rcx = 0;
122 info->vm_regs.rdx = 0;
123 info->vm_regs.rsi = 0;
124 info->vm_regs.rdi = 0;
125 info->vm_regs.rbp = 0;
131 // can we start a kernel thread here...
132 int start_svm_guest(struct guest_info *info) {
136 PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
137 //PrintDebugVMCB((vmcb_t*)(info->vmm_data));
141 safe_svm_launch((vmcb_t*)(info->vmm_data), &(info->vm_regs));
142 //launch_svm((vmcb_t*)(info->vmm_data));
143 PrintDebug("SVM Returned\n");
145 if (handle_svm_exit(info) != 0) {
154 vmcb_t * Allocate_VMCB() {
155 vmcb_t * vmcb_page = (vmcb_t*)os_hooks->allocate_pages(1);
158 memset(vmcb_page, 0, 4096);
164 void Init_VMCB_Real(vmcb_t * vmcb, guest_info_t vm_info) {
165 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
166 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
170 guest_state->rsp = vm_info.rsp;
171 guest_state->rip = vm_info.rip;
177 guest_state->efer |= EFER_MSR_svm_enable;
178 guest_state->rflags = 0x00000002; // The reserved bit is always 1
179 ctrl_area->svm_instrs.instrs.VMRUN = 1;
180 // guest_state->cr0 = 0x00000001; // PE
181 ctrl_area->guest_ASID = 1;
182 guest_state->cr0 = 0x60000010;
185 ctrl_area->exceptions.ex_names.de = 1;
186 ctrl_area->exceptions.ex_names.df = 1;
187 ctrl_area->exceptions.ex_names.pf = 1;
188 ctrl_area->exceptions.ex_names.ts = 1;
189 ctrl_area->exceptions.ex_names.ss = 1;
190 ctrl_area->exceptions.ex_names.ac = 1;
191 ctrl_area->exceptions.ex_names.mc = 1;
192 ctrl_area->exceptions.ex_names.gp = 1;
193 ctrl_area->exceptions.ex_names.ud = 1;
194 ctrl_area->exceptions.ex_names.np = 1;
195 ctrl_area->exceptions.ex_names.of = 1;
196 ctrl_area->exceptions.ex_names.nmi = 1;
198 guest_state->cs.selector = 0xf000;
199 guest_state->cs.limit=0xffff;
200 guest_state->cs.base = 0xffff0000;
201 guest_state->cs.attrib.raw = 0x9a;
204 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
205 for ( i = 0; segregs[i] != NULL; i++) {
206 struct vmcb_selector * seg = segregs[i];
208 seg->selector = 0x0000;
209 seg->base = 0xffff0000;
210 seg->attrib.raw = 0x9b;
217 EAX, EBX, ECX, ESI, EDI, EBP, ESP == 0x0
220 guest_state->gdtr.base = 0;
221 guest_state->gdtr.limit = 0xffff;
222 guest_state->gdtr.attrib.raw = 0x0;
224 guest_state->idtr.base = 0;
225 guest_state->idtr.limit = 0xffff;
226 guest_state->idtr.attrib.raw = 0x0;
228 guest_state->ldtr.base = 0;
229 guest_state->ldtr.limit = 0xffff;
230 guest_state->ldtr.attrib.raw = 0x82;
232 guest_state->tr.base = 0;
233 guest_state->tr.limit = 0xffff;
234 guest_state->tr.attrib.raw = 0x83;
239 if (vm_info.io_map.num_ports > 0) {
240 vmm_io_hook_t * iter;
241 addr_t io_port_bitmap;
243 io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
244 memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
246 ctrl_area->IOPM_BASE_PA = io_port_bitmap;
248 //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
250 FOREACH_IO_HOOK(vm_info.io_map, iter) {
251 ushort_t port = iter->port;
252 uchar_t * bitmap = (uchar_t *)io_port_bitmap;
254 bitmap += (port / 8);
255 PrintDebug("Setting Bit in block %x\n", bitmap);
256 *bitmap |= 1 << (port % 8);
259 // memset((uchar_t*)io_port_bitmap, 0xff, PAGE_SIZE * 2);
260 //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
262 ctrl_area->instrs.instrs.IOIO_PROT = 1;
265 ctrl_area->instrs.instrs.INTR = 1;
267 // also determine if CPU supports nested paging
269 if (vm_info.page_mode == SHADOW_PAGING) {
270 PrintDebug("Creating initial shadow page table\n");
271 vm_info.shadow_page_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&(vm_info.mem_map)) & ~0xfff);
272 PrintDebug("Created\n");
274 guest_state->cr3 = vm_info.shadow_page_state.shadow_cr3.r_reg;
276 ctrl_area->cr_reads.crs.cr3 = 1;
277 ctrl_area->cr_writes.crs.cr3 = 1;
278 ctrl_area->cr_reads.crs.cr0 = 1;
279 ctrl_area->cr_writes.crs.cr0 = 1;
281 ctrl_area->instrs.instrs.INVLPG = 1;
282 ctrl_area->instrs.instrs.INVLPGA = 1;
285 guest_state->g_pat = 0x7040600070406ULL;
287 guest_state->cr0 |= 0x80000000;
288 } else if (vm_info.page_mode == NESTED_PAGING) {
289 // Flush the TLB on entries/exits
290 //ctrl_area->TLB_CONTROL = 1;
292 // Enable Nested Paging
293 //ctrl_area->NP_ENABLE = 1;
295 //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
297 // Set the Nested Page Table pointer
298 // ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
299 // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
301 // ctrl_area->N_CR3 = Get_CR3();
302 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
304 // guest_state->g_pat = 0x7040600070406ULL;
310 void Init_VMCB(vmcb_t * vmcb, guest_info_t vm_info) {
311 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
312 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
316 guest_state->rsp = vm_info.rsp;
317 guest_state->rip = vm_info.rip;
321 ctrl_area->cr_writes.crs.cr0 = 1;
323 guest_state->efer |= EFER_MSR_svm_enable;
324 guest_state->rflags = 0x00000002; // The reserved bit is always 1
325 ctrl_area->svm_instrs.instrs.VMRUN = 1;
326 // guest_state->cr0 = 0x00000001; // PE
327 ctrl_area->guest_ASID = 1;
330 ctrl_area->exceptions.ex_names.de = 1;
331 ctrl_area->exceptions.ex_names.df = 1;
332 ctrl_area->exceptions.ex_names.pf = 1;
333 ctrl_area->exceptions.ex_names.ts = 1;
334 ctrl_area->exceptions.ex_names.ss = 1;
335 ctrl_area->exceptions.ex_names.ac = 1;
336 ctrl_area->exceptions.ex_names.mc = 1;
337 ctrl_area->exceptions.ex_names.gp = 1;
338 ctrl_area->exceptions.ex_names.ud = 1;
339 ctrl_area->exceptions.ex_names.np = 1;
340 ctrl_area->exceptions.ex_names.of = 1;
341 ctrl_area->exceptions.ex_names.nmi = 1;
343 guest_state->cs.selector = 0x0000;
344 guest_state->cs.limit=~0u;
345 guest_state->cs.base = guest_state->cs.selector<<4;
346 guest_state->cs.attrib.raw = 0xf3;
349 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
350 for ( i = 0; segregs[i] != NULL; i++) {
351 struct vmcb_selector * seg = segregs[i];
353 seg->selector = 0x0000;
354 seg->base = seg->selector << 4;
355 seg->attrib.raw = 0xf3;
359 if (vm_info.io_map.num_ports > 0) {
360 vmm_io_hook_t * iter;
361 addr_t io_port_bitmap;
363 io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
364 memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
366 ctrl_area->IOPM_BASE_PA = io_port_bitmap;
368 //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
370 FOREACH_IO_HOOK(vm_info.io_map, iter) {
371 ushort_t port = iter->port;
372 uchar_t * bitmap = (uchar_t *)io_port_bitmap;
374 bitmap += (port / 8);
375 PrintDebug("Setting Bit in block %x\n", bitmap);
376 *bitmap |= 1 << (port % 8);
380 //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
382 ctrl_area->instrs.instrs.IOIO_PROT = 1;
385 ctrl_area->instrs.instrs.INTR = 1;
389 if (vm_info.page_mode == SHADOW_PAGING) {
390 PrintDebug("Creating initial shadow page table\n");
391 vm_info.shadow_page_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&(vm_info.mem_map)) & ~0xfff);
392 PrintDebug("Created\n");
394 guest_state->cr3 = vm_info.shadow_page_state.shadow_cr3.r_reg;
396 ctrl_area->cr_reads.crs.cr3 = 1;
397 ctrl_area->cr_writes.crs.cr3 = 1;
398 ctrl_area->cr_reads.crs.cr0 = 1;
399 ctrl_area->cr_writes.crs.cr0 = 1;
401 ctrl_area->instrs.instrs.INVLPG = 1;
402 ctrl_area->instrs.instrs.INVLPGA = 1;
403 ctrl_area->instrs.instrs.CR0 = 1;
407 guest_state->g_pat = 0x7040600070406ULL;
409 guest_state->cr0 |= 0x80000000;
410 } else if (vm_info.page_mode == NESTED_PAGING) {
411 // Flush the TLB on entries/exits
412 //ctrl_area->TLB_CONTROL = 1;
414 // Enable Nested Paging
415 //ctrl_area->NP_ENABLE = 1;
417 //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
419 // Set the Nested Page Table pointer
420 // ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
421 // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
423 // ctrl_area->N_CR3 = Get_CR3();
424 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
426 // guest_state->g_pat = 0x7040600070406ULL;
433 void Init_VMCB_pe(vmcb_t *vmcb, guest_info_t vm_info) {
434 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
435 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
439 guest_state->rsp = vm_info.rsp;
440 guest_state->rip = vm_info.rip;
443 /* I pretty much just gutted this from TVMM */
444 /* Note: That means its probably wrong */
446 // set the segment registers to mirror ours
447 guest_state->cs.selector = 1<<3;
448 guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
449 guest_state->cs.attrib.fields.S = 1;
450 guest_state->cs.attrib.fields.P = 1;
451 guest_state->cs.attrib.fields.db = 1;
452 guest_state->cs.attrib.fields.G = 1;
453 guest_state->cs.limit = 0xfffff;
454 guest_state->cs.base = 0;
456 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
457 for ( i = 0; segregs[i] != NULL; i++) {
458 struct vmcb_selector * seg = segregs[i];
460 seg->selector = 2<<3;
461 seg->attrib.fields.type = 0x2; // Data Segment+read/write
462 seg->attrib.fields.S = 1;
463 seg->attrib.fields.P = 1;
464 seg->attrib.fields.db = 1;
465 seg->attrib.fields.G = 1;
466 seg->limit = 0xfffff;
472 /* JRL THIS HAS TO GO */
474 guest_state->tr.selector = GetTR_Selector();
475 guest_state->tr.attrib.fields.type = 0x9;
476 guest_state->tr.attrib.fields.P = 1;
477 guest_state->tr.limit = GetTR_Limit();
478 guest_state->tr.base = GetTR_Base();// - 0x2000;
486 guest_state->efer |= EFER_MSR_svm_enable;
487 guest_state->rflags = 0x00000002; // The reserved bit is always 1
488 ctrl_area->svm_instrs.instrs.VMRUN = 1;
489 guest_state->cr0 = 0x00000001; // PE
490 ctrl_area->guest_ASID = 1;
493 // guest_state->cpl = 0;
499 ctrl_area->cr_writes.crs.cr4 = 1;
501 ctrl_area->exceptions.ex_names.de = 1;
502 ctrl_area->exceptions.ex_names.df = 1;
503 ctrl_area->exceptions.ex_names.pf = 1;
504 ctrl_area->exceptions.ex_names.ts = 1;
505 ctrl_area->exceptions.ex_names.ss = 1;
506 ctrl_area->exceptions.ex_names.ac = 1;
507 ctrl_area->exceptions.ex_names.mc = 1;
508 ctrl_area->exceptions.ex_names.gp = 1;
509 ctrl_area->exceptions.ex_names.ud = 1;
510 ctrl_area->exceptions.ex_names.np = 1;
511 ctrl_area->exceptions.ex_names.of = 1;
512 ctrl_area->exceptions.ex_names.nmi = 1;
516 ctrl_area->instrs.instrs.IOIO_PROT = 1;
517 ctrl_area->IOPM_BASE_PA = (uint_t)os_hooks->allocate_pages(3);
521 tmp_reg.r_reg = ctrl_area->IOPM_BASE_PA;
522 memset((void*)(tmp_reg.e_reg.low), 0xffffffff, PAGE_SIZE * 2);
525 ctrl_area->instrs.instrs.INTR = 1;
532 memset(gdt_buf, 0, 6);
533 memset(idt_buf, 0, 6);
536 uint_t gdt_base, idt_base;
537 ushort_t gdt_limit, idt_limit;
540 gdt_base = *(ulong_t*)((uchar_t*)gdt_buf + 2) & 0xffffffff;
541 gdt_limit = *(ushort_t*)(gdt_buf) & 0xffff;
542 PrintDebug("GDT: base: %x, limit: %x\n", gdt_base, gdt_limit);
545 idt_base = *(ulong_t*)(idt_buf + 2) & 0xffffffff;
546 idt_limit = *(ushort_t*)(idt_buf) & 0xffff;
547 PrintDebug("IDT: base: %x, limit: %x\n",idt_base, idt_limit);
550 // gdt_base -= 0x2000;
551 //idt_base -= 0x2000;
553 guest_state->gdtr.base = gdt_base;
554 guest_state->gdtr.limit = gdt_limit;
555 guest_state->idtr.base = idt_base;
556 guest_state->idtr.limit = idt_limit;
562 // also determine if CPU supports nested paging
564 if (vm_info.page_tables) {
566 // Flush the TLB on entries/exits
567 ctrl_area->TLB_CONTROL = 1;
569 // Enable Nested Paging
570 ctrl_area->NP_ENABLE = 1;
572 PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
574 // Set the Nested Page Table pointer
575 ctrl_area->N_CR3 |= ((addr_t)vm_info.page_tables & 0xfffff000);
578 // ctrl_area->N_CR3 = Get_CR3();
579 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
581 guest_state->g_pat = 0x7040600070406ULL;
583 PrintDebug("Set Nested CR3: lo: 0x%x hi: 0x%x\n", (uint_t)*(&(ctrl_area->N_CR3)), (uint_t)*((unsigned char *)&(ctrl_area->N_CR3) + 4));
584 PrintDebug("Set Guest CR3: lo: 0x%x hi: 0x%x\n", (uint_t)*(&(guest_state->cr3)), (uint_t)*((unsigned char *)&(guest_state->cr3) + 4));
586 // guest_state->cr0 |= 0x80000000;