ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
}
- /* 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");
if (v3_get_mem_mode(info) == VIRTUAL_MEM) {
- struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
- PrintDebug("Setting up Guest Page Table\n");
- info->ctrl_regs.cr3 = *(addr_t*)guest_cr3;
+ /* struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
+ info->ctrl_regs.cr3 = *(addr_t*)guest_cr3;
+ */
+ PrintDebug("Activating Shadow Page Tables\n");
+
+ if (v3_activate_shadow_pt(info) == -1) {
+ PrintError("Failed to activate shadow page tables\n");
+ return -1;
+ }
} else {
- info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt);
+
+ if (v3_activate_passthrough_pt(info) == -1) {
+ PrintError("Failed to activate passthrough page tables\n");
+ return -1;
+ }
shadow_cr0->pg = 1;
}
ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
}
- /* 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");
if (handle_mov_to_cr3_32(info, &dec_instr) == -1) {
return -1;
}
+ break;
case PROTECTED_PAE:
if (handle_mov_to_cr3_32pae(info, &dec_instr) == -1) {
return -1;
}
+ break;
case LONG:
if (handle_mov_to_cr3_64(info, &dec_instr) == -1) {
return -1;
}
+ break;
case LONG_32_COMPAT:
if (handle_mov_to_cr3_64compat(info, &dec_instr) == -1) {
return -1;
}
+ break;
default:
PrintError("Unhandled CPU mode: %d\n", info->cpu_mode);
return -1;
if (info->shdw_pg_mode == SHADOW_PAGING) {
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->ctrl_regs.cr3);
+#ifdef DEBUG_CTRL_REGS
+ struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
+#endif
-
PrintDebug("Old Shadow CR3=%x; Old Guest CR3=%x\n",
*(uint_t*)shadow_cr3, *(uint_t*)guest_cr3);
ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
}
- /* 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");
return 0;
}
+
+// We don't need to virtualize CR4, all we need is to detect the activation of PAE
int v3_handle_cr4_read(struct guest_info * info) {
- PrintError("CR4 Read not handled\n");
- return -1;
+ // PrintError("CR4 Read not handled\n");
+ // Do nothing...
+ return 0;
}
int v3_handle_cr4_write(struct guest_info * info) {
static int activate_shadow_pt_64(struct guest_info * info);
-static int handle_shadow_pte32_fault(struct guest_info* info,
- addr_t fault_addr,
- pf_error_t error_code,
- pte32_t * shadow_pte,
- pte32_t * guest_pte);
-
-static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
+static int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
+static int handle_shadow_pagefault_32pae(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
+static int handle_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
int v3_init_shadow_page_state(struct guest_info * info) {
struct shadow_page_state * state = &(info->shdw_pg_state);
+// We assume that shdw_pg_state.guest_cr3 is pointing to the page tables we want to activate
+// We also assume that the CPU mode has not changed during this page table transition
static int activate_shadow_pt_32(struct guest_info * info) {
struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
}
+int v3_activate_passthrough_pt(struct guest_info * info) {
+ // For now... But we need to change this....
+ // As soon as shadow paging becomes active the passthrough tables are hosed
+ // So this will cause chaos if it is called at that time
+
+ info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt);
+ //PrintError("Activate Passthrough Page tables not implemented\n");
+ return 0;
+}
+
+
+
int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
if (info->mem_mode == PHYSICAL_MEM) {
switch (info->cpu_mode) {
case PROTECTED:
- return handle_shadow_pagefault32(info, fault_addr, error_code);
+ return handle_shadow_pagefault_32(info, fault_addr, error_code);
break;
case PROTECTED_PAE:
+ return handle_shadow_pagefault_32pae(info, fault_addr, error_code);
case LONG:
+ return handle_shadow_pagefault_64(info, fault_addr, error_code);
+ break;
default:
PrintError("Unhandled CPU Mode\n");
return -1;
-/* The guest status checks have already been done,
- * only special case shadow checks remain
+/*
+ * *
+ * *
+ * * 64 bit Page table fault handlers
+ * *
+ * *
*/
-static int handle_large_pagefault32(struct guest_info * info,
- addr_t fault_addr, pf_error_t error_code,
- pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde)
-{
- pt_access_status_t shadow_pte_access = can_access_pte32(shadow_pt, fault_addr, error_code);
- pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
-
- if (shadow_pte_access == PT_ACCESS_OK) {
- // Inconsistent state...
- // Guest Re-Entry will flush tables and everything should now workd
- PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
- return 0;
- }
-
- if (shadow_pte_access == PT_ENTRY_NOT_PRESENT) {
- // Get the guest physical address of the fault
- addr_t guest_fault_pa = PDE32_4MB_T_ADDR(*large_guest_pde) + PD32_4MB_PAGE_OFFSET(fault_addr);
- host_region_type_t host_page_type = get_shadow_addr_type(info, guest_fault_pa);
-
+static int handle_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+ PrintError("64 bit shadow paging not implemented\n");
+ return -1;
+}
- if (host_page_type == HOST_REGION_INVALID) {
- // Inject a machine check in the guest
- PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa);
- v3_raise_exception(info, MC_EXCEPTION);
- return 0;
- }
- if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) {
- struct shadow_page_state * state = &(info->shdw_pg_state);
- addr_t shadow_pa = get_shadow_addr(info, guest_fault_pa);
+/*
+ * *
+ * *
+ * * 32 bit PAE Page table fault handlers
+ * *
+ * *
+ */
- shadow_pte->page_base_addr = PT32_BASE_ADDR(shadow_pa);
+static int handle_shadow_pagefault_32pae(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+ PrintError("32 bit PAE shadow paging not implemented\n");
+ return -1;
+}
- shadow_pte->present = 1;
- /* We are assuming that the PDE entry has precedence
- * so the Shadow PDE will mirror the guest PDE settings,
- * and we don't have to worry about them here
- * Allow everything
- */
- shadow_pte->user_page = 1;
- if (find_pte_map(state->cached_ptes, PT32_PAGE_ADDR(guest_fault_pa)) != NULL) {
- // Check if the entry is a page table...
- PrintDebug("Marking page as Guest Page Table (large page)\n");
- shadow_pte->vmm_info = PT32_GUEST_PT;
- shadow_pte->writable = 0;
- } else {
- shadow_pte->writable = 1;
- }
- //set according to VMM policy
- shadow_pte->write_through = 0;
- shadow_pte->cache_disable = 0;
- shadow_pte->global_page = 0;
- //
-
- } else {
- // Handle hooked pages as well as other special pages
- if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) {
- PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
- return -1;
- }
- }
- } else if ((shadow_pte_access == PT_WRITE_ERROR) &&
- (shadow_pte->vmm_info == PT32_GUEST_PT)) {
- struct shadow_page_state * state = &(info->shdw_pg_state);
- PrintDebug("Write operation on Guest PAge Table Page (large page)\n");
- state->cached_cr3 = 0;
- shadow_pte->writable = 1;
- } else {
- PrintError("Error in large page fault handler...\n");
- PrintError("This case should have been handled at the top level handler\n");
- return -1;
- }
+/*
+ * *
+ * *
+ * * 32 bit Page table fault handlers
+ * *
+ * *
+ */
+static int handle_large_pagefault_32(struct guest_info * info,
+ addr_t fault_addr, pf_error_t error_code,
+ pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde);
- PrintDebug("Returning from large page fault handler\n");
- return 0;
-}
+static int handle_shadow_pte32_fault(struct guest_info * info,
+ addr_t fault_addr,
+ pf_error_t error_code,
+ pte32_t * shadow_pt,
+ pte32_t * guest_pt);
-static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
+static int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
pde32_t * guest_pd = NULL;
pde32_t * shadow_pd = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
addr_t guest_cr3 = CR3_TO_PDE32_PA(info->shdw_pg_state.guest_cr3);
return -1;
}
} else if (guest_pde->large_page == 1) {
- if (handle_large_pagefault32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) {
+ if (handle_large_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) {
PrintError("Error handling large pagefault\n");
return -1;
}
+/* The guest status checks have already been done,
+ * only special case shadow checks remain
+ */
+static int handle_large_pagefault_32(struct guest_info * info,
+ addr_t fault_addr, pf_error_t error_code,
+ pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde)
+{
+ pt_access_status_t shadow_pte_access = can_access_pte32(shadow_pt, fault_addr, error_code);
+ pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
+
+ if (shadow_pte_access == PT_ACCESS_OK) {
+ // Inconsistent state...
+ // Guest Re-Entry will flush tables and everything should now workd
+ PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
+ return 0;
+ }
+
+
+ if (shadow_pte_access == PT_ENTRY_NOT_PRESENT) {
+ // Get the guest physical address of the fault
+ addr_t guest_fault_pa = PDE32_4MB_T_ADDR(*large_guest_pde) + PD32_4MB_PAGE_OFFSET(fault_addr);
+ host_region_type_t host_page_type = get_shadow_addr_type(info, guest_fault_pa);
+
+
+ if (host_page_type == HOST_REGION_INVALID) {
+ // Inject a machine check in the guest
+ PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa);
+ v3_raise_exception(info, MC_EXCEPTION);
+ return 0;
+ }
+
+ if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) {
+ struct shadow_page_state * state = &(info->shdw_pg_state);
+ addr_t shadow_pa = get_shadow_addr(info, guest_fault_pa);
+
+ shadow_pte->page_base_addr = PT32_BASE_ADDR(shadow_pa);
+
+ shadow_pte->present = 1;
+
+ /* We are assuming that the PDE entry has precedence
+ * so the Shadow PDE will mirror the guest PDE settings,
+ * and we don't have to worry about them here
+ * Allow everything
+ */
+ shadow_pte->user_page = 1;
+
+ if (find_pte_map(state->cached_ptes, PT32_PAGE_ADDR(guest_fault_pa)) != NULL) {
+ // Check if the entry is a page table...
+ PrintDebug("Marking page as Guest Page Table (large page)\n");
+ shadow_pte->vmm_info = PT32_GUEST_PT;
+ shadow_pte->writable = 0;
+ } else {
+ shadow_pte->writable = 1;
+ }
+
+
+ //set according to VMM policy
+ shadow_pte->write_through = 0;
+ shadow_pte->cache_disable = 0;
+ shadow_pte->global_page = 0;
+ //
+
+ } else {
+ // Handle hooked pages as well as other special pages
+ if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) {
+ PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
+ return -1;
+ }
+ }
+ } else if ((shadow_pte_access == PT_WRITE_ERROR) &&
+ (shadow_pte->vmm_info == PT32_GUEST_PT)) {
+
+ struct shadow_page_state * state = &(info->shdw_pg_state);
+ PrintDebug("Write operation on Guest PAge Table Page (large page)\n");
+ state->cached_cr3 = 0;
+ shadow_pte->writable = 1;
+
+ } else {
+ PrintError("Error in large page fault handler...\n");
+ PrintError("This case should have been handled at the top level handler\n");
+ return -1;
+ }
+
+ PrintDebug("Returning from large page fault handler\n");
+ return 0;
+}
+
+
+
+
/*
* We assume the the guest pte pointer has already been translated to a host virtual address
*/
addr_t guest_pa = PTE32_T_ADDR((*guest_pte)) + PT32_PAGE_OFFSET(fault_addr);
// Page Table Entry Not Present
+ PrintDebug("guest_pa =%p\n", (void *)guest_pa);
host_region_type_t host_page_type = get_shadow_addr_type(info, guest_pa);
