#include <palacios/vmm.h>
#include <palacios/vm_guest_mem.h>
#include <palacios/vmm_decoder.h>
+#include <palacios/vmm_ctrl_regs.h>
#ifndef DEBUG_SHADOW_PAGING
#undef PrintDebug
-
static uint_t pte_hash_fn(addr_t key) {
return hash_long(key, 32);
}
}
+
+static int activate_shadow_pt_32(struct guest_info * info);
+static int activate_shadow_pt_32pae(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,
struct shadow_page_state * state = &(info->shdw_pg_state);
state->guest_cr3 = 0;
- state->shadow_cr3 = 0;
-
state->guest_cr0 = 0;
-
-
state->cr3_cache = create_hashtable(0, &cr3_hash_fn, &cr3_equals);
state->cached_cr3 = 0;
int v3_replace_shdw_page32(struct guest_info * info, addr_t location, pte32_t * new_page, pte32_t * old_page) {
- pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3);
+ pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->ctrl_regs.cr3);
pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(location)]);
if (shadow_pde->large_page == 0) {
+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 cached = 0;
+
+ // Check if shadow page tables are in the cache
+ cached = v3_cache_page_tables32(info, (addr_t)V3_PAddr((void *)(addr_t)CR3_TO_PDE32((void *)*(addr_t *)guest_cr3)));
+
+ if (cached == -1) {
+ PrintError("CR3 Cache failed\n");
+ return -1;
+ } else if (cached == 0) {
+ addr_t shadow_pt;
+
+ PrintDebug("New CR3 is different - flushing shadow page table %p\n", shadow_cr3 );
+ delete_page_tables_32((pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3));
+
+ shadow_pt = v3_create_new_shadow_pt();
+
+ shadow_cr3->pdt_base_addr = (addr_t)V3_PAddr((void *)(addr_t)PD32_BASE_ADDR(shadow_pt));
+ PrintDebug( "Created new shadow page table %p\n", (void *)(addr_t)shadow_cr3->pdt_base_addr );
+ //PrintDebugPageTables( (pde32_t *)CR3_TO_PDE32(*(uint_t*)shadow_cr3) );
+ } else {
+ PrintDebug("Reusing cached shadow Page table\n");
+ }
+
+ shadow_cr3->pwt = guest_cr3->pwt;
+ shadow_cr3->pcd = guest_cr3->pcd;
+
+ return 0;
+}
+
+static int activate_shadow_pt_32pae(struct guest_info * info) {
+ PrintError("Activating 32 bit PAE page tables not implemented\n");
+ return -1;
+}
+
+static int activate_shadow_pt_64(struct guest_info * info) {
+ PrintError("Activating 64 bit page tables not implemented\n");
+ return -1;
+}
+
+
+// Reads the guest CR3 register
+// creates new shadow page tables
+// updates the shadow CR3 register to point to the new pts
+int v3_activate_shadow_pt(struct guest_info * info) {
+ switch (info->cpu_mode) {
+
+ case PROTECTED:
+ return activate_shadow_pt_32(info);
+ case PROTECTED_PAE:
+ return activate_shadow_pt_32pae(info);
+ case LONG:
+ case LONG_32_COMPAT:
+ case LONG_16_COMPAT:
+ return activate_shadow_pt_64(info);
+ default:
+ PrintError("Invalid CPU mode: %d\n", info->cpu_mode);
+ return -1;
+ }
+
+ return 0;
+}
+
int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
pde32_t * guest_pd = NULL;
- pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3);
- addr_t guest_cr3 = (addr_t) V3_PAddr( CR3_TO_PDE32(info->shdw_pg_state.guest_cr3) );
+ pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->ctrl_regs.cr3);
+ addr_t guest_cr3 = (addr_t) V3_PAddr(CR3_TO_PDE32(info->shdw_pg_state.guest_cr3) );
pt_access_status_t guest_pde_access;
pt_access_status_t shadow_pde_access;
pde32_t * guest_pde = NULL;
/* Currently Does not work with Segmentation!!! */
int v3_handle_shadow_invlpg(struct guest_info * info)
{
- if (info->mem_mode != VIRTUAL_MEM) {
- // Paging must be turned on...
- // should handle with some sort of fault I think
- PrintError("ERROR: INVLPG called in non paged mode\n");
- return -1;
- }
-
-
- if (info->cpu_mode != PROTECTED)
- return 0;
-
- uchar_t instr[15];
- int index = 0;
-
- int ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
- if (ret != 15) {
- PrintError("Could not read instruction 0x%p (ret=%d)\n", (void *)(addr_t)(info->rip), ret);
- return -1;
- }
-
-
- /* Can INVLPG work with Segments?? */
- while (is_prefix_byte(instr[index])) {
- index++;
- }
+ if (info->mem_mode != VIRTUAL_MEM) {
+ // Paging must be turned on...
+ // should handle with some sort of fault I think
+ PrintError("ERROR: INVLPG called in non paged mode\n");
+ return -1;
+ }
+
+
+ if (info->cpu_mode != PROTECTED) {
+ return 0;
+ }
+
+ uchar_t instr[15];
+ int index = 0;
+
+ int ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
+ if (ret != 15) {
+ PrintError("Could not read instruction 0x%p (ret=%d)\n", (void *)(addr_t)(info->rip), ret);
+ return -1;
+ }
+
+
+ /* Can INVLPG work with Segments?? */
+ while (is_prefix_byte(instr[index])) {
+ index++;
+ }
- if( instr[index + 0] != (uchar_t) 0x0f
- || instr[index + 1] != (uchar_t) 0x01
- ) {
- PrintError("invalid Instruction Opcode\n");
- PrintTraceMemDump(instr, 15);
- return -1;
- }
-
- addr_t first_operand;
- addr_t second_operand;
- addr_t guest_cr3 = (addr_t)V3_PAddr( (void*)(addr_t) CR3_TO_PDE32(info->shdw_pg_state.guest_cr3) );
-
- pde32_t * guest_pd = NULL;
-
- if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pd) == -1)
- {
- PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3);
- return -1;
- }
-
- index += 2;
-
- v3_operand_type_t addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
-
- if (addr_type != MEM_OPERAND) {
- PrintError("Invalid Operand type\n");
- return -1;
- }
-
- pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3);
- pde32_t * shadow_pde = (pde32_t *)&shadow_pd[PDE32_INDEX(first_operand)];
- pde32_t * guest_pde;
-
- //PrintDebug("PDE Index=%d\n", PDE32_INDEX(first_operand));
- //PrintDebug("FirstOperand = %x\n", first_operand);
-
- PrintDebug("Invalidating page for %p\n", (void *)first_operand);
-
- guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(first_operand)]);
-
- if (guest_pde->large_page == 1) {
- shadow_pde->present = 0;
- PrintDebug("Invalidating Large Page\n");
- } else
- if (shadow_pde->present == 1) {
- pte32_t * shadow_pt = (pte32_t *)(addr_t)PDE32_T_ADDR((*shadow_pde));
- pte32_t * shadow_pte = (pte32_t *) V3_VAddr( (void*) &shadow_pt[PTE32_INDEX(first_operand)] );
+ if( (instr[index + 0] != (uchar_t) 0x0f) ||
+ (instr[index + 1] != (uchar_t) 0x01) ) {
+ PrintError("invalid Instruction Opcode\n");
+ PrintTraceMemDump(instr, 15);
+ return -1;
+ }
+
+ addr_t first_operand;
+ addr_t second_operand;
+ addr_t guest_cr3 = (addr_t)V3_PAddr( (void*)(addr_t) CR3_TO_PDE32(info->shdw_pg_state.guest_cr3) );
+
+ pde32_t * guest_pd = NULL;
+
+ if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pd) == -1) {
+ PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3);
+ return -1;
+ }
+
+ index += 2;
+ v3_operand_type_t addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
+
+ if (addr_type != MEM_OPERAND) {
+ PrintError("Invalid Operand type\n");
+ return -1;
+ }
+
+ pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->ctrl_regs.cr3);
+ pde32_t * shadow_pde = (pde32_t *)&shadow_pd[PDE32_INDEX(first_operand)];
+ pde32_t * guest_pde;
+
+ //PrintDebug("PDE Index=%d\n", PDE32_INDEX(first_operand));
+ //PrintDebug("FirstOperand = %x\n", first_operand);
+
+ PrintDebug("Invalidating page for %p\n", (void *)first_operand);
+
+ guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(first_operand)]);
+
+ if (guest_pde->large_page == 1) {
+ shadow_pde->present = 0;
+ PrintDebug("Invalidating Large Page\n");
+ } else
+ if (shadow_pde->present == 1) {
+ pte32_t * shadow_pt = (pte32_t *)(addr_t)PDE32_T_ADDR((*shadow_pde));
+ pte32_t * shadow_pte = (pte32_t *) V3_VAddr( (void*) &shadow_pt[PTE32_INDEX(first_operand)] );
+
#ifdef DEBUG_SHADOW_PAGING
- PrintDebug("Setting not present\n");
- PrintPTE32(first_operand, shadow_pte );
+ PrintDebug("Setting not present\n");
+ PrintPTE32(first_operand, shadow_pte );
#endif
-
- shadow_pte->present = 0;
- }
-
- info->rip += index;
-
- return 0;
+
+ shadow_pte->present = 0;
+ }
+
+ info->rip += index;
+
+ return 0;
}
