#include <palacios/vmm_decoder.h>
#include <palacios/vmm_ctrl_regs.h>
+#include <palacios/vmm_hashtable.h>
+
#ifndef DEBUG_SHADOW_PAGING
#undef PrintDebug
#define PrintDebug(fmt, args...)
***/
+struct guest_table {
+ addr_t cr3;
+ struct list_head link;
+};
+
+
+struct backptr {
+ addr_t ptr;
+ struct list_head link;
+};
+
+
+struct shadow_page_data {
+ addr_t ptr;
+ addr_t guest_addr;
+
+ struct list_head backptrs;
+ struct list_head guest_tables;
+};
+
{
pt_access_status_t shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code);
pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
-
+ addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_4MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_4MB(fault_addr);
+
+ struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_fault_pa);
+
+
+ if ((shdw_reg == NULL) ||
+ (shdw_reg->host_type == SHDW_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 -1;
+ }
+
if (shadow_pte_access == PT_ACCESS_OK) {
// Inconsistent state...
// Guest Re-Entry will flush tables and everything should now workd
if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
// Get the guest physical address of the fault
- addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_4MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_4MB(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) {
+ if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) ||
+ (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) {
struct shadow_page_state * state = &(info->shdw_pg_state);
- addr_t shadow_pa = get_shadow_addr(info, guest_fault_pa);
+ addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_fault_pa);
shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
PrintDebug("Marking page as Guest Page Table (large page)\n");
shadow_pte->vmm_info = PT32_GUEST_PT;
shadow_pte->writable = 0;
+ } else if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
+ shadow_pte->writable = 0;
} else {
shadow_pte->writable = 1;
}
-
//set according to VMM policy
shadow_pte->write_through = 0;
shadow_pte->cache_disable = 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) {
+ // if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) {
+
+ if (v3_handle_mem_full_hook(info, fault_addr, guest_fault_pa, shdw_reg, 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_ACCESS_WRITE_ERROR) &&
- (shadow_pte->vmm_info == PT32_GUEST_PT)) {
+ } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) {
+
+ if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
- 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;
+ if (v3_handle_mem_wr_hook(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) {
+ PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
+ return -1;
+ }
+ } else if (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");
pt_access_status_t shadow_pte_access;
pte32_t * guest_pte = (pte32_t *)&(guest_pt[PTE32_INDEX(fault_addr)]);;
pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
+ addr_t guest_pa = BASE_TO_PAGE_ADDR((addr_t)(guest_pte->page_base_addr)) + PAGE_OFFSET(fault_addr);
+ struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_pa);
+
+ if ((shdw_reg == NULL) ||
+ (shdw_reg->host_type == SHDW_REGION_INVALID)) {
+ // Inject a machine check in the guest
+ PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_pa);
+ v3_raise_exception(info, MC_EXCEPTION);
+ return 0;
+ }
// Check the guest page permissions
guest_pte_access = v3_can_access_pte32(guest_pt, fault_addr, error_code);
if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
-
- addr_t guest_pa = BASE_TO_PAGE_ADDR((addr_t)(guest_pte->page_base_addr)) + 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);
-
- 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_pa);
- v3_raise_exception(info, MC_EXCEPTION);
- return 0;
- }
-
- // else...
-
- if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) {
+ if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) ||
+ (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) {
struct shadow_page_state * state = &(info->shdw_pg_state);
- addr_t shadow_pa = get_shadow_addr(info, guest_pa);
+ addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_pa);
shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
shadow_pte->vmm_info = PT32_GUEST_PT;
}
- if (guest_pte->dirty == 1) {
+ if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
+ shadow_pte->writable = 0;
+ } else if (guest_pte->dirty == 1) {
shadow_pte->writable = guest_pte->writable;
} else if ((guest_pte->dirty == 0) && (error_code.write == 1)) {
shadow_pte->writable = guest_pte->writable;
shadow_pte->writable = 0;
}
-
-
} else {
// Page fault handled by hook functions
- if (handle_special_page_fault(info, fault_addr, guest_pa, error_code) == -1) {
+
+ if (v3_handle_mem_full_hook(info, fault_addr, guest_pa, shdw_reg, 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_ACCESS_WRITE_ERROR) &&
(guest_pte->dirty == 0)) {
-
- PrintDebug("Shadow PTE Write Error\n");
+ */
+ } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) {
guest_pte->dirty = 1;
- shadow_pte->writable = guest_pte->writable;
+
+ if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
+ if (v3_handle_mem_wr_hook(info, fault_addr, guest_pa, shdw_reg, error_code) == -1) {
+ PrintError("Special Page fault handler returned error for address: %p\n", (void *)fault_addr);
+ return -1;
+ }
+ } else {
+ PrintDebug("Shadow PTE Write Error\n");
+ shadow_pte->writable = guest_pte->writable;
+ }
if (shadow_pte->vmm_info == PT32_GUEST_PT) {
struct shadow_page_state * state = &(info->shdw_pg_state);
PrintDebug("Write operation on Guest PAge Table Page\n");
state->cached_cr3 = 0;
}
-
+
return 0;
} else {
