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>
9 extern struct vmm_os_hooks * os_hooks;
11 extern uint_t cpuid_ecx(uint_t op);
12 extern uint_t cpuid_edx(uint_t op);
13 extern void Get_MSR(uint_t MSR, uint_t * high_byte, uint_t * low_byte);
14 extern void Set_MSR(uint_t MSR, uint_t high_byte, uint_t low_byte);
15 extern uint_t launch_svm(vmcb_t * vmcb_addr);
18 /* Checks machine SVM capability */
19 /* Implemented from: AMD Arch Manual 3, sect 15.4 */
20 int is_svm_capable() {
21 uint_t ret = cpuid_ecx(CPUID_FEATURE_IDS);
22 uint_t vm_cr_low = 0, vm_cr_high = 0;
25 if ((ret & CPUID_FEATURE_IDS_ecx_svm_avail) == 0) {
26 PrintDebug("SVM Not Available\n");
30 Get_MSR(SVM_VM_CR_MSR, &vm_cr_high, &vm_cr_low);
32 if ((vm_cr_low & SVM_VM_CR_MSR_svmdis) == 0) {
36 ret = cpuid_edx(CPUID_SVM_REV_AND_FEATURE_IDS);
38 if ((ret & CPUID_SVM_REV_AND_FEATURE_IDS_edx_svml) == 0) {
39 PrintDebug("SVM BIOS Disabled, not unlockable\n");
41 PrintDebug("SVM is locked with a key\n");
49 void Init_SVM(struct vmm_ctrl_ops * vmm_ops) {
54 // Enable SVM on the CPU
55 Get_MSR(EFER_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
56 msr.e_reg.low |= EFER_MSR_svm_enable;
57 Set_MSR(EFER_MSR, 0, msr.e_reg.low);
59 PrintDebug("SVM Enabled\n");
62 // Setup the host state save area
63 host_state = os_hooks->allocate_pages(1);
66 msr.e_reg.low = (uint_t)host_state;
69 PrintDebug("Host State being saved at %x\n", (uint_t)host_state);
70 Set_MSR(SVM_VM_HSAVE_PA_MSR, msr.e_reg.high, msr.e_reg.low);
74 // Setup the SVM specific vmm operations
75 vmm_ops->init_guest = &init_svm_guest;
76 vmm_ops->start_guest = &start_svm_guest;
83 int init_svm_guest(struct guest_info *info) {
86 PrintDebug("Allocating VMCB\n");
87 info->vmm_data = (void*)Allocate_VMCB();
90 PrintDebug("Generating Guest nested page tables\n");
91 print_mem_list(&(info->mem_list));
92 print_mem_layout(&(info->mem_layout));
93 pde = generate_guest_page_tables(&(info->mem_layout), &(info->mem_list));
94 PrintDebugPageTables(pde);
97 PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
98 Init_VMCB((vmcb_t*)(info->vmm_data), *info);
107 // can we start a kernel thread here...
108 int start_svm_guest(struct guest_info *info) {
109 vmcb_ctrl_t * guest_ctrl = 0;
111 ulong_t exit_code = 0;
113 PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
115 launch_svm((vmcb_t*)(info->vmm_data));
117 guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
120 PrintDebug("SVM Returned: (Exit Code=%x) (VMCB=%x)\n",&(guest_ctrl->exit_code), info->vmm_data);
123 exit_code = guest_ctrl->exit_code;
125 PrintDebug("SVM Returned: Exit Code: %x\n",exit_code);
133 * We handle the svm exits here
134 * This function should probably be moved to another file to keep things managable....
136 int handle_svm_exit(struct VMM_GPRs guest_gprs) {
142 vmcb_t * Allocate_VMCB() {
143 vmcb_t * vmcb_page = (vmcb_t*)os_hooks->allocate_pages(1);
146 memset(vmcb_page, 0, 4096);
153 void Init_VMCB(vmcb_t *vmcb, guest_info_t vm_info) {
154 vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
155 vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
159 guest_state->rsp = vm_info.rsp;
160 guest_state->rip = vm_info.rip;
163 /* I pretty much just gutted this from TVMM */
164 /* Note: That means its probably wrong */
166 // set the segment registers to mirror ours
167 guest_state->cs.selector = 0;
168 guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
169 guest_state->cs.attrib.fields.S = 1;
170 guest_state->cs.attrib.fields.P = 1;
171 guest_state->cs.attrib.fields.db = 1;
172 guest_state->cs.limit = 0xffffffff;
173 guest_state->cs.base = 0;
175 struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
176 for ( i = 0; segregs[i] != NULL; i++) {
177 struct vmcb_selector * seg = segregs[i];
180 seg->attrib.fields.type = 0x2; // Data Segment+read/write
181 seg->attrib.fields.S = 1;
182 seg->attrib.fields.P = 1;
183 seg->attrib.fields.db = 1;
184 seg->limit = 0xffffffff;
189 guest_state->efer |= EFER_MSR_svm_enable;
190 guest_state->cr0 = 0x00000001; // PE
191 guest_state->rflags = 0x00000002; // The reserved bit is always 1
192 ctrl_area->svm_instrs.instrs.VMRUN = 1;
193 ctrl_area->guest_ASID = 1;