added support for memory remapping

[palacios.git] / palacios / src / palacios / vmm_direct_paging_32.h

diff --git a/palacios/src/palacios/vmm_direct_paging_32.h b/palacios/src/palacios/vmm_direct_paging_32.h
index 4df18a9..c15712b 100644 (file)
--- a/palacios/src/palacios/vmm_direct_paging_32.h
+++ b/palacios/src/palacios/vmm_direct_paging_32.h
@@ -33,7 +33,7 @@ static inline int handle_passthrough_pagefault_32(struct guest_info * info,
                                                  addr_t fault_addr, 
                                                  pf_error_t error_code) {
     // Check to see if pde and pte exist (create them if not)
-    pde32_t * pde = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
+    pde32_t * pde = NULL;
     pte32_t * pte = NULL;
     addr_t host_addr = 0;
     
@@ -42,8 +42,7 @@ static inline int handle_passthrough_pagefault_32(struct guest_info * info,
     
     struct v3_shadow_region * region = v3_get_shadow_region(info, fault_addr);
     
-    if ((region == NULL) || 
-       (region->host_type == SHDW_REGION_INVALID)) {
+    if (region == NULL) {
        PrintError("Invalid region in passthrough page fault 32, addr=%p\n", 
                   (void *)fault_addr);
        return -1;
@@ -51,6 +50,14 @@ static inline int handle_passthrough_pagefault_32(struct guest_info * info,
     
     host_addr = v3_get_shadow_addr(region, fault_addr);
     
+    // Lookup the correct PDE address based on the PAGING MODE
+    if (info->shdw_pg_mode == SHADOW_PAGING) {
+       pde = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
+    } else {
+       pde = CR3_TO_PDE32_VA(info->direct_map_pt);
+    }
+
+
     // Fix up the PDE entry
     if (pde[pde_index].present == 0) {
        pte = (pte32_t *)create_generic_pt_page();
@@ -100,4 +107,40 @@ static inline int handle_passthrough_pagefault_32(struct guest_info * info,
 }
 
 
+
+
+static inline int invalidate_addr_32(struct guest_info * info, addr_t inv_addr) {
+    pde32_t * pde = NULL;
+    pte32_t * pte = NULL;
+
+    // TODO:
+    // Call INVLPGA
+
+    // clear the page table entry
+    int pde_index = PDE32_INDEX(inv_addr);
+    int pte_index = PTE32_INDEX(inv_addr);
+
+    
+    // Lookup the correct PDE address based on the PAGING MODE
+    if (info->shdw_pg_mode == SHADOW_PAGING) {
+       pde = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
+    } else {
+       pde = CR3_TO_PDE32_VA(info->direct_map_pt);
+    }    
+
+    if (pde[pde_index].present == 0) {
+       return 0;
+    } else if (pde[pde_index].large_page) {
+       pde[pde_index].present = 0;
+       return 0;
+    }
+
+    pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pde[pde_index].pt_base_addr));
+
+    pte[pte_index].present = 0;
+
+    return 0;
+}
+
+
 #endif