additions for syscall hijacking

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

diff --git a/palacios/src/palacios/svm.c b/palacios/src/palacios/svm.c
index bb65a6f..59af9a7 100644 (file)
--- a/palacios/src/palacios/svm.c
+++ b/palacios/src/palacios/svm.c
@@ -135,6 +135,12 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) {
     ctrl_area->instrs.PAUSE = 1;
     ctrl_area->instrs.shutdown_evts = 1;
 
+    /* KCH: intercept writes to IDTR and SW Interrupts (INT) */
+#ifdef CONFIG_SYSCALL_HIJACK
+    ctrl_area->instrs.WR_IDTR = 0;
+    ctrl_area->instrs.INTn = 1;
+#endif
+
 
     /* DEBUG FOR RETURN CODE */
     ctrl_area->exit_code = 1;
@@ -223,6 +229,22 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) {
                &v3_handle_efer_write, 
                core);
 
+#ifdef CONFIG_HIJACK_MSR
+    /* KCH: for syscall interposition */
+    v3_hook_msr(core->vm_info, STAR_MSR,
+        &v3_handle_star_read,
+        &v3_handle_star_write,
+        core);
+    v3_hook_msr(core->vm_info, LSTAR_MSR,
+        &v3_handle_lstar_read,
+        &v3_handle_lstar_write,
+        core);
+    v3_hook_msr(core->vm_info, CSTAR_MSR,
+        &v3_handle_cstar_read,
+        &v3_handle_cstar_write,
+        core);
+#endif
+
     if (core->shdw_pg_mode == SHADOW_PAGING) {
        PrintDebug("Creating initial shadow page table\n");
        
@@ -422,9 +444,18 @@ static int update_irq_entry_state(struct guest_info * info) {
            case V3_NMI:
                guest_ctrl->EVENTINJ.type = SVM_INJECTION_NMI;
                break;
-           case V3_SOFTWARE_INTR:
-               guest_ctrl->EVENTINJ.type = SVM_INJECTION_SOFT_INTR;
-               break;
+           case V3_SOFTWARE_INTR: {
+            PrintDebug("KCH: Caught an injected software interrupt\n");
+            PrintDebug("\ttype: %d, vector: %d\n", SVM_INJECTION_SOFT_INTR, info->intr_core_state.sw_intr_vector);
+            guest_ctrl->EVENTINJ.type = SVM_INJECTION_SOFT_INTR;
+            guest_ctrl->EVENTINJ.vector = info->intr_core_state.sw_intr_vector;
+            guest_ctrl->EVENTINJ.valid = 1;
+            
+            // clear out stuff?
+            info->intr_core_state.sw_intr_pending = 0;
+            info->intr_core_state.sw_intr_vector = 0;
+            break;
+        }
            case V3_VIRTUAL_IRQ:
                guest_ctrl->EVENTINJ.type = SVM_INJECTION_IRQ;
                break;