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);
- pte32_t * pte = NULL;
- addr_t host_addr = 0;
-
- int pde_index = PDE32_INDEX(fault_addr);
- int pte_index = PTE32_INDEX(fault_addr);
-
- struct v3_shadow_region * region = v3_get_shadow_region(info, fault_addr);
-
- if ((region == NULL) ||
- (region->host_type == SHDW_REGION_INVALID)) {
- PrintError("Invalid region in passthrough page fault 32, addr=%p\n",
- (void *)fault_addr);
- return -1;
- }
-
- host_addr = v3_get_shadow_addr(region, fault_addr);
-
- // Fix up the PDE entry
- if (pde[pde_index].present == 0) {
- pte = (pte32_t *)create_generic_pt_page();
+ // Check to see if pde and pte exist (create them if not)
+ pde32_t * pde = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
+ pte32_t * pte = NULL;
+ addr_t host_addr = 0;
- pde[pde_index].present = 1;
- pde[pde_index].writable = 1;
- pde[pde_index].user_page = 1;
- pde[pde_index].pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(pte));
-
- } else {
- pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pde[pde_index].pt_base_addr));
- }
-
- // Fix up the PTE entry
- if (pte[pte_index].present == 0) {
-
- pte[pte_index].user_page = 1;
-
- if (region->host_type == SHDW_REGION_ALLOCATED) {
- // Full access
- pte[pte_index].present = 1;
- pte[pte_index].writable = 1;
-
- pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
- } else if (region->host_type == SHDW_REGION_WRITE_HOOK) {
- // Only trap writes
- pte[pte_index].present = 1;
- pte[pte_index].writable = 0;
-
- pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
- } else if (region->host_type == SHDW_REGION_FULL_HOOK) {
- // trap all accesses
- return v3_handle_mem_full_hook(info, fault_addr, fault_addr, region, error_code);
+ int pde_index = PDE32_INDEX(fault_addr);
+ int pte_index = PTE32_INDEX(fault_addr);
+
+ struct v3_shadow_region * region = v3_get_shadow_region(info, fault_addr);
+
+ if ((region == NULL) ||
+ (region->host_type == SHDW_REGION_INVALID)) {
+ PrintError("Invalid region in passthrough page fault 32, addr=%p\n",
+ (void *)fault_addr);
+ return -1;
+ }
+
+ host_addr = v3_get_shadow_addr(region, fault_addr);
+
+ // Fix up the PDE entry
+ if (pde[pde_index].present == 0) {
+ pte = (pte32_t *)create_generic_pt_page();
+
+ pde[pde_index].present = 1;
+ pde[pde_index].writable = 1;
+ pde[pde_index].user_page = 1;
+ pde[pde_index].pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(pte));
+
} else {
- PrintError("Unknown Region Type...\n");
- return -1;
+ pte = V3_VAddr((void*)BASE_TO_PAGE_ADDR(pde[pde_index].pt_base_addr));
}
- }
-
- if ( (region->host_type == SHDW_REGION_WRITE_HOOK) &&
- (error_code.write == 1) ) {
- return v3_handle_mem_wr_hook(info, fault_addr, fault_addr, region, error_code);
- }
-
+ // Fix up the PTE entry
+ if (pte[pte_index].present == 0) {
+
+ pte[pte_index].user_page = 1;
+
+ if (region->host_type == SHDW_REGION_ALLOCATED) {
+ // Full access
+ pte[pte_index].present = 1;
+ pte[pte_index].writable = 1;
+
+ pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
+ } else if (region->host_type == SHDW_REGION_WRITE_HOOK) {
+ // Only trap writes
+ pte[pte_index].present = 1;
+ pte[pte_index].writable = 0;
+
+ pte[pte_index].page_base_addr = PAGE_BASE_ADDR(host_addr);
+ } else if (region->host_type == SHDW_REGION_FULL_HOOK) {
+ // trap all accesses
+ return v3_handle_mem_full_hook(info, fault_addr, fault_addr, region, error_code);
+ } else {
+ PrintError("Unknown Region Type...\n");
+ return -1;
+ }
+ }
+
+ if ( (region->host_type == SHDW_REGION_WRITE_HOOK) &&
+ (error_code.write == 1) ) {
+ return v3_handle_mem_wr_hook(info, fault_addr, fault_addr, region, error_code);
+ }
- return 0;
+
+ return 0;
}
