X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fgeekos%2Fsvm_ctrl_regs.c;h=656bb9eb87d8af00df734cfa7e81a0034ebcace6;hb=8cb3daaded0d8c80be801aa74493006b5a06999f;hp=e822e633d45dadd7f291dfe8ad40c779fcc34f2e;hpb=7acd54f8c3b30d118d56186a9c6506f21f85096d;p=palacios.git

diff --git a/palacios/src/geekos/svm_ctrl_regs.c b/palacios/src/geekos/svm_ctrl_regs.c
index e822e63..656bb9e 100644
--- a/palacios/src/geekos/svm_ctrl_regs.c
+++ b/palacios/src/geekos/svm_ctrl_regs.c
@@ -5,32 +5,39 @@
 #include <geekos/vmm_emulate.h>
 
 
-int handle_cr0_write(guest_info_t * info, ullong_t * new_cr0) {
-  // vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA((vmcb_t *)(info->vmm_data));
-  //vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data));
+int handle_cr0_write(struct guest_info * info, ullong_t * new_cr0) {
+  vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA((vmcb_t *)(info->vmm_data));
+  vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data));
+  char instr[15];
   
-
   
-  /*
+
 
   if (info->cpu_mode == REAL) {
-    addr_t host_addr;
-    shadow_region_t * region = get_shadow_region_by_addr(&(info->mem_map), (addr_t)(info->rip));
-    if (!region || (region->host_type != HOST_REGION_PHYSICAL_MEMORY)) {
-      //PANIC
+    read_guest_pa_memory(info, (addr_t)guest_state->rip, 15, instr);
+    int index = 0;
+
+    while (is_prefix_byte(instr[index])) {
+      index++; 
+    }
+    
+    if ((instr[index] == cr_access_byte) && 
+	(instr[index + 1] == lmsw_byte)) {
+      // LMSW
+      // decode mod/RM
+
+    } else if ((instr[index] == cr_access_byte) && 
+	       (instr[index + 1] == clts_byte)) {
+      // CLTS
+    } else {
+      // unsupported instruction, GPF the guest
       return -1;
     }
 
-    guest_paddr_to_host_paddr(region, (addr_t)(info->rip), &host_addr);
-    // pa to va
+
+  }
 
 
-    PrintDebug("Instr: %.4x\n", *(ushort_t*)host_addr);
-    
-    if ((*(ushort_t*)host_addr) == LMSW_EAX) {
-      PrintDebug("lmsw from eax (0x%x)\n", guest_state->rax);
-    }
-    }*/
   return 0;
 }