Added support for wbinvd instruction exit (which windows uses)

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

diff --git a/palacios/src/palacios/vmm_ctrl_regs.c b/palacios/src/palacios/vmm_ctrl_regs.c
index a55dd93..89d896b 100644 (file)
--- a/palacios/src/palacios/vmm_ctrl_regs.c
+++ b/palacios/src/palacios/vmm_ctrl_regs.c
@@ -20,6 +20,14 @@
 #endif
 
 
+// Set to 1 if CR3 reload with same value shall not
+// force a shadow page table flush
+// It makes windows loading MUCH faster. 
+// Note that this optimization appears to fail with a 2.6 linux kernel
+#define CR3_RELOAD_OPTIMIZATION 1
+
+
+
 
 
 
@@ -37,11 +45,13 @@ int handle_cr0_write(struct guest_info * info) {
     ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
   }
 
-  if (ret != 15) {
+  /* The IFetch will already have faulted in the necessary bytes for the full instruction
+    if (ret != 15) {
     // I think we should inject a GPF into the guest
     PrintError("Could not read instruction (ret=%d)\n", ret);
     return -1;
-  }
+    }
+  */
 
   if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
     PrintError("Could not decode instruction\n");
@@ -51,7 +61,7 @@ int handle_cr0_write(struct guest_info * info) {
 
   if (opcode_cmp(V3_OPCODE_LMSW, (const uchar_t *)(dec_instr.opcode)) == 0) {
     struct cr0_real *real_cr0  = (struct cr0_real*)&(info->ctrl_regs.cr0);
-    struct cr0_real *new_cr0 = (struct cr0_real *)(dec_instr.first_operand.operand);   
+    struct cr0_real *new_cr0 = (struct cr0_real *)(dec_instr.src_operand.operand);     
     uchar_t new_cr0_val;
 
     PrintDebug("LMSW\n");
@@ -82,9 +92,9 @@ int handle_cr0_write(struct guest_info * info) {
     } else {
       // 32 bit registers
        struct cr0_32 *real_cr0 = (struct cr0_32*)&(info->ctrl_regs.cr0);
-       struct cr0_32 *new_cr0= (struct cr0_32 *)(dec_instr.second_operand.operand);
+       struct cr0_32 *new_cr0= (struct cr0_32 *)(dec_instr.src_operand.operand);
 
-       PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.first_operand.size);
+       PrintDebug("OperandVal = %x, length=%d\n", *new_cr0, dec_instr.src_operand.size);
 
 
        PrintDebug("Old CR0=%x\n", *real_cr0);
@@ -149,11 +159,13 @@ int handle_cr0_read(struct guest_info * info) {
     ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
   }
 
-  if (ret != 15) {
-    // I think we should inject a GPF into the guest
-    PrintError("Could not read instruction (ret=%d)\n", ret);
-    return -1;
-  }
+  /* The IFetch will already have faulted in the necessary bytes for the full instruction
+     if (ret != 15) {
+     // I think we should inject a GPF into the guest
+     PrintError("Could not read instruction (ret=%d)\n", ret);
+     return -1;
+     }
+  */
 
   if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
     PrintError("Could not decode instruction\n");
@@ -161,7 +173,7 @@ int handle_cr0_read(struct guest_info * info) {
   }
   
   if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) {
-    struct cr0_32 * virt_cr0 = (struct cr0_32 *)(dec_instr.first_operand.operand);
+    struct cr0_32 * virt_cr0 = (struct cr0_32 *)(dec_instr.dst_operand.operand);
     struct cr0_32 * real_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
     
     PrintDebug("MOVCR2\n");
@@ -177,7 +189,7 @@ int handle_cr0_read(struct guest_info * info) {
     PrintDebug("returned CR0: %x\n", *(uint_t*)virt_cr0);
   } else if (opcode_cmp(V3_OPCODE_SMSW, (const uchar_t *)(dec_instr.opcode)) == 0) {
     struct cr0_real *real_cr0= (struct cr0_real*)&(info->ctrl_regs.cr0);
-    struct cr0_real *virt_cr0 = (struct cr0_real *)(dec_instr.first_operand.operand);
+    struct cr0_real *virt_cr0 = (struct cr0_real *)(dec_instr.dst_operand.operand);
     char cr0_val = *(char*)real_cr0 & 0x0f;
     
     PrintDebug("SMSW\n");
@@ -212,11 +224,13 @@ int handle_cr3_write(struct guest_info * info) {
     ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
   }
 
-  if (ret != 15) {
-    // I think we should inject a GPF into the guest
-    PrintError("Could not read instruction (ret=%d)\n", ret);
-    return -1;
-  }
+  /* The IFetch will already have faulted in the necessary bytes for the full instruction
+     if (ret != 15) {
+     // I think we should inject a GPF into the guest
+     PrintError("Could not read instruction (ret=%d)\n", ret);
+     return -1;
+     }
+  */
 
   if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
     PrintError("Could not decode instruction\n");
@@ -230,14 +244,14 @@ int handle_cr3_write(struct guest_info * info) {
     PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3));
 
     if (info->shdw_pg_mode == SHADOW_PAGING) {
-      struct cr3_32 * new_cr3 = (struct cr3_32 *)(dec_instr.second_operand.operand);   
+      struct cr3_32 * new_cr3 = (struct cr3_32 *)(dec_instr.src_operand.operand);      
       struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
       struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.shadow_cr3);
       
       PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n", 
                 *(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
       
-      if (!CR3_32_SAME_BASE(new_cr3, guest_cr3)) { 
+      if (!CR3_RELOAD_OPTIMIZATION || !CR3_32_SAME_BASE(new_cr3, guest_cr3)) { 
        addr_t shadow_pt;
 
        
@@ -245,7 +259,7 @@ int handle_cr3_write(struct guest_info * info) {
        
        delete_page_tables_pde32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3));
        
-       shadow_pt =  create_new_shadow_pt32(info);
+       shadow_pt =  create_new_shadow_pt32();
        
        shadow_cr3->pdt_base_addr = PD32_BASE_ADDR(shadow_pt);    
       } 
@@ -289,11 +303,13 @@ int handle_cr3_read(struct guest_info * info) {
     ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
   }
 
-  if (ret != 15) {
-    // I think we should inject a GPF into the guest
-    PrintError("Could not read instruction (ret=%d)\n", ret);
-    return -1;
-  }
+  /* The IFetch will already have faulted in the necessary bytes for the full instruction
+     if (ret != 15) {
+     // I think we should inject a GPF into the guest
+     PrintError("Could not read instruction (ret=%d)\n", ret);
+     return -1;
+     }
+  */
 
   if (v3_decode(info, (addr_t)instr, &dec_instr) == -1) {
     PrintError("Could not decode instruction\n");
@@ -302,7 +318,7 @@ int handle_cr3_read(struct guest_info * info) {
 
   if (opcode_cmp(V3_OPCODE_MOVCR2, (const uchar_t *)(dec_instr.opcode)) == 0) {
     PrintDebug("MOVCR32\n");
-    struct cr3_32 * virt_cr3 = (struct cr3_32 *)(dec_instr.first_operand.operand);
+    struct cr3_32 * virt_cr3 = (struct cr3_32 *)(dec_instr.dst_operand.operand);
 
     PrintDebug("CR3 at 0x%x\n", &(info->ctrl_regs.cr3));