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 ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_np) == 1) {
47 PrintDebug("Nested Paging not supported\n");
50 if ((vm_cr_low & SVM_VM_CR_MSR_svmdis) == 0) {
54 ret = cpuid_edx(CPUID_SVM_REV_AND_FEATURE_IDS);
56 if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_svml) == 0) {
57 PrintDebug("SVM BIOS Disabled, not unlockable\n");
59 PrintDebug("SVM is locked with a key\n");
67 void Init_SVM(struct vmm_ctrl_ops * vmm_ops) {
72 // Enable SVM on the CPU
73 Get_MSR(EFER_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
74 msr.e_reg.low |= EFER_MSR_svm_enable;
75 Set_MSR(EFER_MSR, 0, msr.e_reg.low);
77 PrintDebug("SVM Enabled\n");
80 // Setup the host state save area
81 host_state = os_hooks->allocate_pages(4);
84 msr.e_reg.low = (uint_t)host_state;
87 PrintDebug("Host State being saved at %x\n", (uint_t)host_state);
88 Set_MSR(SVM_VM_HSAVE_PA_MSR, msr.e_reg.high, msr.e_reg.low);
92 // Setup the SVM specific vmm operations
93 vmm_ops->init_guest = &init_svm_guest;
94 vmm_ops->start_guest = &start_svm_guest;
101 int init_svm_guest(struct guest_info *info) {
103 PrintDebug("Allocating VMCB\n");
104 info->vmm_data = (void*)Allocate_VMCB();
107 //PrintDebug("Generating Guest nested page tables\n");
108 // info->page_tables = NULL;
109 //info->page_tables = generate_guest_page_tables_64(&(info->mem_layout), &(info->mem_list));
110 //info->page_tables = generate_guest_page_tables(&(info->mem_layout), &(info->mem_list));
111 //PrintDebugPageTables(info->page_tables);
115 PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
116 Init_VMCB((vmcb_t*)(info->vmm_data), *info);
119 info->vm_regs.rbx = 0;
120 info->vm_regs.rcx = 0;
121 info->vm_regs.rdx = 0;
122 info->vm_regs.rsi = 0;
123 info->vm_regs.rdi = 0;
124 info->vm_regs.rbp = 0;
130 // can we start a kernel thread here...
131 int start_svm_guest(struct guest_info *info) {
135 PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
136 //PrintDebugVMCB((vmcb_t*)(info->vmm_data));
140 safe_svm_launch((vmcb_t*)(info->vmm_data), &(info->vm_regs));
141 //launch_svm((vmcb_t*)(info->vmm_data));
142 PrintDebug("SVM Returned\n");
144 if (handle_svm_exit(info) != 0) {
153 vmcb_t * Allocate_VMCB() {
154 vmcb_t * vmcb_page = (vmcb_t*)os_hooks->allocate_pages(1);
157 memset(vmcb_page, 0, 4096);
163 void Init_VMCB_Real(vmcb_t * vmcb, guest_info_t vm_info) {
164 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
165 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
169 guest_state->rsp = vm_info.rsp;
170 guest_state->rip = vm_info.rip;
176 guest_state->efer |= EFER_MSR_svm_enable;
177 guest_state->rflags = 0x00000002; // The reserved bit is always 1
178 ctrl_area->svm_instrs.instrs.VMRUN = 1;
179 // guest_state->cr0 = 0x00000001; // PE
180 ctrl_area->guest_ASID = 1;
181 guest_state->cr0 = 0x60000010;
184 ctrl_area->exceptions.ex_names.de = 1;
185 ctrl_area->exceptions.ex_names.df = 1;
186 ctrl_area->exceptions.ex_names.pf = 1;
187 ctrl_area->exceptions.ex_names.ts = 1;
188 ctrl_area->exceptions.ex_names.ss = 1;
189 ctrl_area->exceptions.ex_names.ac = 1;
190 ctrl_area->exceptions.ex_names.mc = 1;
191 ctrl_area->exceptions.ex_names.gp = 1;
192 ctrl_area->exceptions.ex_names.ud = 1;
193 ctrl_area->exceptions.ex_names.np = 1;
194 ctrl_area->exceptions.ex_names.of = 1;
195 ctrl_area->exceptions.ex_names.nmi = 1;
197 guest_state->cs.selector = 0xf000;
198 guest_state->cs.limit=0xffff;
199 guest_state->cs.base = 0xffff0000;
200 guest_state->cs.attrib.raw = 0x9a;
203 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
204 for ( i = 0; segregs[i] != NULL; i++) {
205 struct vmcb_selector * seg = segregs[i];
207 seg->selector = 0x0000;
208 seg->base = 0xffff0000;
209 seg->attrib.raw = 0x9b;
216 EAX, EBX, ECX, ESI, EDI, EBP, ESP == 0x0
219 guest_state->gdtr.base = 0;
220 guest_state->gdtr.limit = 0xffff;
221 guest_state->gdtr.attrib.raw = 0x0;
223 guest_state->idtr.base = 0;
224 guest_state->idtr.limit = 0xffff;
225 guest_state->idtr.attrib.raw = 0x0;
227 guest_state->ldtr.base = 0;
228 guest_state->ldtr.limit = 0xffff;
229 guest_state->ldtr.attrib.raw = 0x82;
231 guest_state->tr.base = 0;
232 guest_state->tr.limit = 0xffff;
233 guest_state->tr.attrib.raw = 0x83;
238 if (vm_info.io_map.num_ports > 0) {
239 vmm_io_hook_t * iter;
240 addr_t io_port_bitmap;
242 io_port_bitmap = (addr_t)os_hooks->allocate_pages(3);
243 memset((uchar_t*)io_port_bitmap, 0, PAGE_SIZE * 3);
245 ctrl_area->IOPM_BASE_PA = io_port_bitmap;
247 //PrintDebug("Setting up IO Map at 0x%x\n", io_port_bitmap);
249 FOREACH_IO_HOOK(vm_info.io_map, iter) {
250 ushort_t port = iter->port;
251 uchar_t * bitmap = (uchar_t *)io_port_bitmap;
253 bitmap += (port / 8);
254 PrintDebug("Setting Bit in block %x\n", bitmap);
255 *bitmap |= 1 << (port % 8);
258 // memset((uchar_t*)io_port_bitmap, 0xff, PAGE_SIZE * 2);
259 //PrintDebugMemDump((uchar_t*)io_port_bitmap, PAGE_SIZE *2);
261 ctrl_area->instrs.instrs.IOIO_PROT = 1;
264 ctrl_area->instrs.instrs.INTR = 1;
266 // also determine if CPU supports nested paging
268 if (vm_info.page_mode == SHADOW_PAGING) {
269 PrintDebug("Creating initial shadow page table\n");
270 vm_info.shadow_page_state.shadow_cr3.e_reg.low |= ((addr_t)create_passthrough_pde32_pts(&(vm_info.mem_map)) & ~0xfff);
271 PrintDebug("Created\n");
273 guest_state->cr3 = vm_info.shadow_page_state.shadow_cr3.r_reg;
275 ctrl_area->cr_reads.crs.cr3 = 1;
276 ctrl_area->cr_writes.crs.cr3 = 1;
277 ctrl_area->cr_reads.crs.cr0 = 1;
278 ctrl_area->cr_writes.crs.cr0 = 1;
280 ctrl_area->instrs.instrs.INVLPG = 1;
281 ctrl_area->instrs.instrs.INVLPGA = 1;
284 guest_state->g_pat = 0x7040600070406ULL;
286 guest_state->cr0 |= 0x80000000;
287 } else if (vm_info.page_mode == NESTED_PAGING) {
288 // Flush the TLB on entries/exits
289 //ctrl_area->TLB_CONTROL = 1;
291 // Enable Nested Paging
292 //ctrl_area->NP_ENABLE = 1;
294 //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
296 // Set the Nested Page Table pointer
297 // ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
298 // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
300 // ctrl_area->N_CR3 = Get_CR3();
301 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
303 // guest_state->g_pat = 0x7040600070406ULL;
309 void Init_VMCB(vmcb_t * vmcb, guest_info_t vm_info) {
310 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
311 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
315 guest_state->rsp = vm_info.rsp;
316 guest_state->rip = vm_info.rip;
319 //ctrl_area->instrs.instrs.CR0 = 1;
320 ctrl_area->cr_reads.crs.cr0 = 1;
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;
400 ctrl_area->instrs.instrs.INVLPG = 1;
401 ctrl_area->instrs.instrs.INVLPGA = 1;
403 guest_state->g_pat = 0x7040600070406ULL;
405 guest_state->cr0 |= 0x80000000;
406 } else if (vm_info.page_mode == NESTED_PAGING) {
407 // Flush the TLB on entries/exits
408 //ctrl_area->TLB_CONTROL = 1;
410 // Enable Nested Paging
411 //ctrl_area->NP_ENABLE = 1;
413 //PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
415 // Set the Nested Page Table pointer
416 // ctrl_area->N_CR3 = ((addr_t)vm_info.page_tables);
417 // ctrl_area->N_CR3 = (addr_t)(vm_info.page_tables);
419 // ctrl_area->N_CR3 = Get_CR3();
420 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
422 // guest_state->g_pat = 0x7040600070406ULL;
429 void Init_VMCB_pe(vmcb_t *vmcb, guest_info_t vm_info) {
430 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
431 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
435 guest_state->rsp = vm_info.rsp;
436 guest_state->rip = vm_info.rip;
439 /* I pretty much just gutted this from TVMM */
440 /* Note: That means its probably wrong */
442 // set the segment registers to mirror ours
443 guest_state->cs.selector = 1<<3;
444 guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
445 guest_state->cs.attrib.fields.S = 1;
446 guest_state->cs.attrib.fields.P = 1;
447 guest_state->cs.attrib.fields.db = 1;
448 guest_state->cs.attrib.fields.G = 1;
449 guest_state->cs.limit = 0xfffff;
450 guest_state->cs.base = 0;
452 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
453 for ( i = 0; segregs[i] != NULL; i++) {
454 struct vmcb_selector * seg = segregs[i];
456 seg->selector = 2<<3;
457 seg->attrib.fields.type = 0x2; // Data Segment+read/write
458 seg->attrib.fields.S = 1;
459 seg->attrib.fields.P = 1;
460 seg->attrib.fields.db = 1;
461 seg->attrib.fields.G = 1;
462 seg->limit = 0xfffff;
468 /* JRL THIS HAS TO GO */
470 guest_state->tr.selector = GetTR_Selector();
471 guest_state->tr.attrib.fields.type = 0x9;
472 guest_state->tr.attrib.fields.P = 1;
473 guest_state->tr.limit = GetTR_Limit();
474 guest_state->tr.base = GetTR_Base();// - 0x2000;
482 guest_state->efer |= EFER_MSR_svm_enable;
483 guest_state->rflags = 0x00000002; // The reserved bit is always 1
484 ctrl_area->svm_instrs.instrs.VMRUN = 1;
485 guest_state->cr0 = 0x00000001; // PE
486 ctrl_area->guest_ASID = 1;
489 // guest_state->cpl = 0;
495 ctrl_area->cr_writes.crs.cr4 = 1;
497 ctrl_area->exceptions.ex_names.de = 1;
498 ctrl_area->exceptions.ex_names.df = 1;
499 ctrl_area->exceptions.ex_names.pf = 1;
500 ctrl_area->exceptions.ex_names.ts = 1;
501 ctrl_area->exceptions.ex_names.ss = 1;
502 ctrl_area->exceptions.ex_names.ac = 1;
503 ctrl_area->exceptions.ex_names.mc = 1;
504 ctrl_area->exceptions.ex_names.gp = 1;
505 ctrl_area->exceptions.ex_names.ud = 1;
506 ctrl_area->exceptions.ex_names.np = 1;
507 ctrl_area->exceptions.ex_names.of = 1;
508 ctrl_area->exceptions.ex_names.nmi = 1;
512 ctrl_area->instrs.instrs.IOIO_PROT = 1;
513 ctrl_area->IOPM_BASE_PA = (uint_t)os_hooks->allocate_pages(3);
517 tmp_reg.r_reg = ctrl_area->IOPM_BASE_PA;
518 memset((void*)(tmp_reg.e_reg.low), 0xffffffff, PAGE_SIZE * 2);
521 ctrl_area->instrs.instrs.INTR = 1;
528 memset(gdt_buf, 0, 6);
529 memset(idt_buf, 0, 6);
532 uint_t gdt_base, idt_base;
533 ushort_t gdt_limit, idt_limit;
536 gdt_base = *(ulong_t*)((uchar_t*)gdt_buf + 2) & 0xffffffff;
537 gdt_limit = *(ushort_t*)(gdt_buf) & 0xffff;
538 PrintDebug("GDT: base: %x, limit: %x\n", gdt_base, gdt_limit);
541 idt_base = *(ulong_t*)(idt_buf + 2) & 0xffffffff;
542 idt_limit = *(ushort_t*)(idt_buf) & 0xffff;
543 PrintDebug("IDT: base: %x, limit: %x\n",idt_base, idt_limit);
546 // gdt_base -= 0x2000;
547 //idt_base -= 0x2000;
549 guest_state->gdtr.base = gdt_base;
550 guest_state->gdtr.limit = gdt_limit;
551 guest_state->idtr.base = idt_base;
552 guest_state->idtr.limit = idt_limit;
558 // also determine if CPU supports nested paging
560 if (vm_info.page_tables) {
562 // Flush the TLB on entries/exits
563 ctrl_area->TLB_CONTROL = 1;
565 // Enable Nested Paging
566 ctrl_area->NP_ENABLE = 1;
568 PrintDebug("NP_Enable at 0x%x\n", &(ctrl_area->NP_ENABLE));
570 // Set the Nested Page Table pointer
571 ctrl_area->N_CR3 |= ((addr_t)vm_info.page_tables & 0xfffff000);
574 // ctrl_area->N_CR3 = Get_CR3();
575 // guest_state->cr3 |= (Get_CR3() & 0xfffff000);
577 guest_state->g_pat = 0x7040600070406ULL;
579 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));
580 PrintDebug("Set Guest CR3: lo: 0x%x hi: 0x%x\n", (uint_t)*(&(guest_state->cr3)), (uint_t)*((unsigned char *)&(guest_state->cr3) + 4));
582 // guest_state->cr0 |= 0x80000000;