This patch virtualizes VM_CR_MSR to tell the guest it cannot use SVM.

[palacios.git] / palacios / src / palacios / svm.c

diff --git a/palacios/src/palacios/svm.c b/palacios/src/palacios/svm.c
index 3ac98d4..f20d78c 100644 (file)
--- a/palacios/src/palacios/svm.c
+++ b/palacios/src/palacios/svm.c
@@ -64,7 +64,15 @@ extern int v3_svm_launch(vmcb_t * vmcb, struct v3_gprs * vm_regs, vmcb_t * host_
 
 
 static vmcb_t * Allocate_VMCB() {
-    vmcb_t * vmcb_page = (vmcb_t *)V3_VAddr(V3_AllocPages(1));
+    vmcb_t * vmcb_page = NULL;
+    addr_t vmcb_pa = (addr_t)V3_AllocPages(1);
+
+    if ((void *)vmcb_pa == NULL) {
+       PrintError("Error allocating VMCB\n");
+       return NULL;
+    }
+
+    vmcb_page = (vmcb_t *)V3_VAddr((void *)vmcb_pa);
 
     memset(vmcb_page, 0, 4096);
 
@@ -87,7 +95,6 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) {
     ctrl_area->svm_instrs.STGI = 1;
     ctrl_area->svm_instrs.CLGI = 1;
     ctrl_area->svm_instrs.SKINIT = 1;
-    ctrl_area->svm_instrs.RDTSCP = 1;
     ctrl_area->svm_instrs.ICEBP = 1;
     ctrl_area->svm_instrs.WBINVD = 1;
     ctrl_area->svm_instrs.MONITOR = 1;
@@ -99,8 +106,8 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) {
     ctrl_area->instrs.HLT = 1;
 
 #ifdef CONFIG_TIME_VIRTUALIZE_TSC
-    ctrl_area->instrs.rdtsc = 1;
-    ctrl_area->svm_instrs.rdtscp = 1;
+    ctrl_area->instrs.RDTSC = 1;
+    ctrl_area->svm_instrs.RDTSCP = 1;
 #endif
 
     // guest_state->cr0 = 0x00000001;    // PE 
@@ -272,6 +279,12 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) {
 
        guest_state->g_pat = 0x7040600070406ULL;
     }
+    
+    /* tell the guest that we don't support SVM */
+    v3_hook_msr(core->vm_info, SVM_VM_CR_MSR, 
+       &v3_handle_vm_cr_read,
+       &v3_handle_vm_cr_write, 
+       core);
 }
 
 
@@ -280,6 +293,11 @@ int v3_init_svm_vmcb(struct guest_info * info, v3_vm_class_t vm_class) {
     PrintDebug("Allocating VMCB\n");
     info->vmm_data = (void*)Allocate_VMCB();
     
+    if (info->vmm_data == NULL) {
+       PrintError("Could not allocate VMCB, Exiting...\n");
+       return -1;
+    }
+
     if (vm_class == V3_PC_VM) {
        PrintDebug("Initializing VMCB (addr=%p)\n", (void *)info->vmm_data);
        Init_VMCB_BIOS((vmcb_t*)(info->vmm_data), info);
@@ -428,6 +446,8 @@ int v3_svm_enter(struct guest_info * info) {
     vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data)); 
     addr_t exit_code = 0, exit_info1 = 0, exit_info2 = 0;
 
+    v3_adjust_time(info);
+
     // Conditionally yield the CPU if the timeslice has expired
     v3_yield_cond(info);
 
@@ -479,15 +499,12 @@ int v3_svm_enter(struct guest_info * info) {
 #endif
 
     v3_update_timers(info);
-
     guest_ctrl->TSC_OFFSET = v3_tsc_host_offset(&info->time_state);
 
     //V3_Print("Calling v3_svm_launch\n");
 
     v3_svm_launch((vmcb_t *)V3_PAddr(info->vmm_data), &(info->vm_regs), (vmcb_t *)host_vmcbs[info->cpu_id]);
 
-    v3_adjust_time(info);
-
     //V3_Print("SVM Returned: Exit Code: %x, guest_rip=%lx\n", (uint32_t)(guest_ctrl->exit_code), (unsigned long)guest_state->rip);
 
     v3_last_exit = (uint32_t)(guest_ctrl->exit_code);
@@ -553,47 +570,44 @@ int v3_svm_enter(struct guest_info * info) {
 }
 
 
-int v3_start_svm_guest(struct guest_info *info) {
+int v3_start_svm_guest(struct guest_info * info) {
     //    vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data));
     //  vmcb_ctrl_t * guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
 
+    PrintDebug("Starting SVM core %u\n", info->cpu_id);
+
+    if (info->cpu_id == 0) {
+       info->core_run_state = CORE_RUNNING;
+       info->vm_info->run_state = VM_RUNNING;
+    } else  { 
+       PrintDebug("SVM core %u: Waiting for core initialization\n", info->cpu_id);
 
-    PrintDebug("Starting SVM core %u\n",info->cpu_id);
-    if (info->cpu_mode==INIT) { 
-       PrintDebug("SVM core %u: I am an AP in INIT mode, waiting for that to change\n",info->cpu_id);
-       while (info->cpu_mode==INIT) {
+       while (info->core_run_state == CORE_STOPPED) {
            v3_yield(info);
            //PrintDebug("SVM core %u: still waiting for INIT\n",info->cpu_id);
        }
-       PrintDebug("SVM core %u: I am out of INIT\n",info->cpu_id);
-       if (info->cpu_mode==SIPI) { 
-           PrintDebug("SVM core %u: I am waiting on a SIPI to set my starting address\n",info->cpu_id);
-           while (info->cpu_mode==SIPI) {
-               v3_yield(info);
-               //PrintDebug("SVM core %u: still waiting for SIPI\n",info->cpu_id);
-           }
-       }
-       PrintDebug("SVM core %u: I have my SIPI\n", info->cpu_id);
-    }
 
-    if (info->cpu_mode!=REAL) { 
-       PrintError("SVM core %u: I am not in REAL mode at launch!  Huh?!\n", info->cpu_id);
-       return -1;
-    }
+       PrintDebug("SVM core %u initialized\n", info->cpu_id);
+    } 
 
     PrintDebug("SVM core %u: I am starting at CS=0x%x (base=0x%p, limit=0x%x),  RIP=0x%p\n", 
-              info->cpu_id, info->segments.cs.selector, (void*)(info->segments.cs.base), 
-              info->segments.cs.limit,(void*)(info->rip));
+              info->cpu_id, info->segments.cs.selector, (void *)(info->segments.cs.base), 
+              info->segments.cs.limit, (void *)(info->rip));
 
 
 
     PrintDebug("SVM core %u: Launching SVM VM (vmcb=%p)\n", info->cpu_id, (void *)info->vmm_data);
     //PrintDebugVMCB((vmcb_t*)(info->vmm_data));
     
-    info->vm_info->run_state = VM_RUNNING;
     v3_start_time(info);
 
     while (1) {
+
+       if (info->vm_info->run_state == VM_STOPPED) {
+           info->core_run_state = CORE_STOPPED;
+           break;
+       }
+       
        if (v3_svm_enter(info) == -1) {
            vmcb_ctrl_t * guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data));
            addr_t host_addr;
@@ -630,6 +644,13 @@ int v3_start_svm_guest(struct guest_info *info) {
 
            break;
        }
+
+
+       if (info->vm_info->run_state == VM_STOPPED) {
+           info->core_run_state = CORE_STOPPED;
+           break;
+       }
+
        
 /*
        if ((info->num_exits % 5000) == 0) {