#include <geekos/svm.h>
+#include <geekos/vmm.h>
+#include <geekos/vmcb.h>
+
+extern struct vmm_os_hooks * os_hooks;
extern uint_t cpuid_ecx(uint_t op);
extern uint_t cpuid_edx(uint_t op);
-extern void Get_MSR(uint_t MSR, ulong_t * high_byte, ulong_t * low_byte);
-extern void Set_MSR(uint_t MSR, ulong_t high_byte, ulong_t low_byte);
+extern void Get_MSR(uint_t MSR, uint_t * high_byte, uint_t * low_byte);
+extern void Set_MSR(uint_t MSR, uint_t high_byte, uint_t low_byte);
+extern uint_t launch_svm(vmcb_t * vmcb_addr);
+
/* Checks machine SVM capability */
/* Implemented from: AMD Arch Manual 3, sect 15.4 */
int is_svm_capable() {
uint_t ret = cpuid_ecx(CPUID_FEATURE_IDS);
- ulong_t vm_cr_low = 0, vm_cr_high = 0;
+ uint_t vm_cr_low = 0, vm_cr_high = 0;
+ return 1;
if ((ret & CPUID_FEATURE_IDS_ecx_svm_avail) == 0) {
PrintDebug("SVM Not Available\n");
return 0;
return 0;
}
+
+
void Init_SVM() {
- ulong_t msr_val_low = 0, msr_val_high = 0;
+ reg_ex_t msr;
+ void * host_state;
+
+
+ // setup
+ Get_MSR(EFER_MSR, &(msr.e_reg.high), &(msr.e_reg.low));
+ msr.e_reg.low |= EFER_MSR_svm_enable;
+ Set_MSR(EFER_MSR, 0, msr.e_reg.low);
+
+ PrintDebug("SVM Enabled\n");
- Get_MSR(EFER_MSR, &msr_val_high, &msr_val_low);
- msr_val_low |= EFER_MSR_svm_enable;
- Set_MSR(EFER_MSR, 0, msr_val_low);
+
+ // Setup the host state save area
+ host_state = os_hooks->Allocate_Pages(1);
- PrintDebug("SVM Inited\n");
+ msr.e_reg.high = 0;
+ msr.e_reg.low = (uint_t)host_state;
+
+
+ PrintDebug("Host State being saved at %x\n", (uint_t)host_state);
+ Set_MSR(SVM_VM_HSAVE_PA_MSR, msr.e_reg.high, msr.e_reg.low);
+
return;
}
+
+
+int init_svm_guest(struct guest_info *info) {
+ PrintDebug("Allocating VMCB\n");
+ info->vmm_data = (void*)Allocate_VMCB();
+
+ PrintDebug("Initializing VMCB (addr=%x)\n", info->vmm_data);
+ Init_VMCB((vmcb_t*)(info->vmm_data), *info);
+
+ return 0;
+}
+
+
+// can we start a kernel thread here...
+int start_svm_guest(struct guest_info *info) {
+ vmcb_ctrl_t * guest_ctrl = 0;
+
+ ulong_t exit_code = 0;
+
+ PrintDebug("Launching SVM VM (vmcb=%x)\n", info->vmm_data);
+
+ launch_svm((vmcb_t*)(info->vmm_data));
+
+ guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
+
+
+ PrintDebug("SVM Returned: (Exit Code=%x) (VMCB=%x)\n",&(guest_ctrl->exit_code), info->vmm_data);
+
+
+ exit_code = guest_ctrl->exit_code;
+
+ PrintDebug("SVM Returned: Exit Code: %x\n",exit_code);
+
+ return 0;
+}
+
+
+
+vmcb_t * Allocate_VMCB() {
+ vmcb_t * vmcb_page = (vmcb_t*)os_hooks->Allocate_Pages(1);
+
+
+ memset(vmcb_page, 0, 4096);
+
+ return vmcb_page;
+}
+
+
+
+void Init_VMCB(vmcb_t *vmcb, guest_info_t vm_info) {
+ vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb);
+ vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA(vmcb);
+ uint_t i = 0;
+
+
+ guest_state->rsp = vm_info.rsp;
+ guest_state->rip = vm_info.rip;
+
+
+ /* I pretty much just gutted this from TVMM */
+ /* Note: That means its probably wrong */
+
+ // set the segment registers to mirror ours
+ guest_state->cs.selector = 0;
+ guest_state->cs.attrib.fields.type = 0xa; // Code segment+read
+ guest_state->cs.attrib.fields.S = 1;
+ guest_state->cs.attrib.fields.P = 1;
+ guest_state->cs.attrib.fields.db = 1;
+ guest_state->cs.limit = 0xffffffff;
+ guest_state->cs.base = 0;
+
+ struct vmcb_selector *segregs [] = {&(guest_state->ss), &(guest_state->ds), &(guest_state->es), &(guest_state->fs), &(guest_state->gs), NULL};
+ for ( i = 0; segregs[i] != NULL; i++) {
+ struct vmcb_selector * seg = segregs[i];
+
+ seg->selector = 0;
+ seg->attrib.fields.type = 0x2; // Data Segment+read/write
+ seg->attrib.fields.S = 1;
+ seg->attrib.fields.P = 1;
+ seg->attrib.fields.db = 1;
+ seg->limit = 0xffffffff;
+ seg->base = 0;
+ }
+
+
+ guest_state->efer |= EFER_MSR_svm_enable;
+ guest_state->cr0 = 0x00000001; // PE
+ guest_state->rflags = 0x00000002; // The reserved bit is always 1
+ ctrl_area->svm_instrs.instrs.VMRUN = 1;
+ ctrl_area->guest_ASID = 1;
+
+
+
+ /* ** */
+
+}
