shdw_page->cr3 = shdw_page->page_pa;
- shadow_cr3->pdt_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa);
+ shadow_cr3->pdt_base_addr = PAGE_BASE_ADDR_4KB(shdw_page->page_pa);
PrintDebug( "Created new shadow page table %p\n", (void *)BASE_TO_PAGE_ADDR(shadow_cr3->pdt_base_addr));
shadow_cr3->pwt = guest_cr3->pwt;
* *
* *
*/
-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);
+static int handle_4MB_shadow_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);
-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_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
+ pte32_t * shadow_pt, pte32_t * guest_pt);
static inline int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(fault_addr)]);
PrintDebug("Shadow page fault handler: %p\n", (void*) fault_addr );
+ PrintDebug("Handling PDE32 Fault\n");
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);
if (is_guest_pf(guest_pde_access, shadow_pde_access) == 1) {
PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (pf error code=%d)\n",
*(uint_t *)&guest_pde_access, *(uint_t *)&error_code);
- inject_guest_pf(info, fault_addr, error_code);
+ if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+ PrintError("Could not inject guest page fault\n");
+ return -1;
+ }
return 0;
}
-
- if (shadow_pde_access == PT_ACCESS_NOT_PRESENT)
- {
- struct shadow_page_data * shdw_page = create_new_shadow_pt(info);
- pte32_t * shadow_pt = (pte32_t *)V3_VAddr((void *)shdw_page->page_pa);
-
- shadow_pde->present = 1;
- shadow_pde->user_page = guest_pde->user_page;
- // shadow_pde->large_page = guest_pde->large_page;
- shadow_pde->large_page = 0;
-
-
- // VMM Specific options
- shadow_pde->write_through = guest_pde->write_through;
- shadow_pde->cache_disable = guest_pde->cache_disable;
- shadow_pde->global_page = guest_pde->global_page;
- //
-
- guest_pde->accessed = 1;
-
- shadow_pde->pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(shadow_pt));
-
- if (guest_pde->large_page == 0) {
- pte32_t * guest_pt = NULL;
- shadow_pde->writable = guest_pde->writable;
-
- if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) {
- // Machine check the guest
- PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr));
- v3_raise_exception(info, MC_EXCEPTION);
- return 0;
- }
-
- if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) {
- PrintError("Error handling Page fault caused by PTE\n");
- return -1;
- }
- } else {
- // ?? What if guest pde is dirty a this point?
- ((pde32_4MB_t *)guest_pde)->dirty = 0;
- shadow_pde->writable = 0;
-
- 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;
- }
- }
- }
- else if (shadow_pde_access == PT_ACCESS_OK)
- {
- //
- // PTE fault
- //
- pte32_t * shadow_pt = (pte32_t *)V3_VAddr( (void*)(addr_t) BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr) );
-
- if (guest_pde->large_page == 0) {
- pte32_t * guest_pt = NULL;
- if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) {
- // Machine check the guest
- PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr));
- v3_raise_exception(info, MC_EXCEPTION);
- return 0;
- }
+ if (shadow_pde_access == PT_ACCESS_USER_ERROR) {
+ //
+ // PDE Entry marked non user
+ //
+ PrintDebug("Shadow Paging User access error (shadow_pde_access=0x%x, guest_pde_access=0x%x)\n",
+ shadow_pde_access, guest_pde_access);
- if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) {
- PrintError("Error handling Page fault caused by PTE\n");
- return -1;
- }
- } else if (guest_pde->large_page == 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;
- }
- }
+ if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+ PrintError("Could not inject guest page fault\n");
+ return -1;
}
- else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) &&
- (guest_pde->large_page == 1))
- {
- //
- // Page Directory Entry marked read-only
- // Its a large page and we need to update the dirty bit in the guest
- //
-
- PrintDebug("Large page write error... Setting dirty bit and returning\n");
- ((pde32_4MB_t *)guest_pde)->dirty = 1;
- shadow_pde->writable = guest_pde->writable;
- return 0;
-
- }
- else if (shadow_pde_access == PT_ACCESS_USER_ERROR)
- {
- //
- // Page Directory Entry marked non-user
- //
- PrintDebug("Shadow Paging User access error (shadow_pde_access=0x%x, guest_pde_access=0x%x)\n",
- shadow_pde_access, guest_pde_access);
- inject_guest_pf(info, fault_addr, error_code);
- return 0;
- }
- else
- {
- // inject page fault in guest
- inject_guest_pf(info, fault_addr, error_code);
- PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access);
- PrintDebug("Manual Says to inject page fault into guest\n");
-#ifdef DEBUG_SHADOW_PAGING
- PrintDebug("Guest PDE: (access=%d)\n\t", guest_pde_access);
- PrintPTEntry(info, PAGE_PD32, fault_addr, guest_pde);
- PrintDebug("Shadow PDE: (access=%d)\n\t", shadow_pde_access);
- PrintPTEntry(info, PAGE_PD32, fault_addr, shadow_pde);
-#endif
-
- return 0;
+ return 0;
+ } else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) &&
+ (guest_pde->large_page == 1)) {
+
+ ((pde32_4MB_t *)guest_pde)->dirty = 1;
+ shadow_pde->writable = guest_pde->writable;
+ return 0;
+ } else if ((shadow_pde_access != PT_ACCESS_NOT_PRESENT) &&
+ (shadow_pde_access != PT_ACCESS_OK)) {
+ // inject page fault in guest
+ if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+ PrintError("Could not inject guest page fault\n");
+ return -1;
}
-
- PrintDebug("Returning end of PDE function (rip=%p)\n", (void *)(addr_t)(info->rip));
- return 0;
-}
-
-
-
-/* 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 = 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) {
- // 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
- PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
+ PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access);
+ PrintDebug("Manual Says to inject page fault into guest\n");
return 0;
}
- if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
- // Get the guest physical address of the fault
+ pte32_t * shadow_pt = NULL;
+ pte32_t * guest_pt = NULL;
- if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) ||
- (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) {
- addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_fault_pa);
+ // Get the next shadow page level, allocate if not present
- shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
-
- shadow_pte->present = 1;
+ if (shadow_pde_access == PT_ACCESS_NOT_PRESENT) {
+ struct shadow_page_data * shdw_page = create_new_shadow_pt(info);
+ shadow_pt = (pte32_t *)V3_VAddr((void *)shdw_page->page_pa);
- /* 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;
+ shadow_pde->present = 1;
+ shadow_pde->user_page = guest_pde->user_page;
- 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 = large_guest_pde->write_through;
- shadow_pte->cache_disable = large_guest_pde->cache_disable;
- shadow_pte->global_page = large_guest_pde->global_page;
- //
-
+ if (guest_pde->large_page == 0) {
+ shadow_pde->writable = guest_pde->writable;
} else {
- // Handle hooked pages as well as other special pages
- // if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) {
+ // This large page flag is temporary until we can get a working cache....
+ ((pde32_4MB_t *)guest_pde)->vmm_info = V3_LARGE_PG;
- 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;
+ if (error_code.write) {
+ shadow_pde->writable = guest_pde->writable;
+ ((pde32_4MB_t *)guest_pde)->dirty = 1;
+ } else {
+ shadow_pde->writable = 0;
+ ((pde32_4MB_t *)guest_pde)->dirty = 0;
}
}
- } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) {
+
- if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
+ // VMM Specific options
+ shadow_pde->write_through = guest_pde->write_through;
+ shadow_pde->cache_disable = guest_pde->cache_disable;
+ shadow_pde->global_page = guest_pde->global_page;
+ //
+
+ guest_pde->accessed = 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;
- }
- }
+ shadow_pde->pt_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa);
+ } else {
+ shadow_pt = (pte32_t *)V3_VAddr((void *)BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr));
+ }
+
+
+ if (guest_pde->large_page == 0) {
+ if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) {
+ // Machine check the guest
+ PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr));
+ v3_raise_exception(info, MC_EXCEPTION);
+ return 0;
+ }
+ if (handle_pte_shadow_pagefault_32(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) {
+ PrintError("Error handling Page fault caused by PTE\n");
+ return -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;
+ if (handle_4MB_shadow_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) {
+ PrintError("Error handling large pagefault\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
- */
-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_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
+ pte32_t * shadow_pt, pte32_t * guest_pt) {
pt_access_status_t guest_pte_access;
pt_access_status_t shadow_pte_access;
// Check the shadow page permissions
shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code);
-#ifdef DEBUG_SHADOW_PAGING
- PrintDebug("Guest PTE: (access=%d)\n\t", guest_pte_access);
- PrintPTEntry(info, PAGE_PT32, fault_addr, guest_pte);
- PrintDebug("Shadow PTE: (access=%d)\n\t", shadow_pte_access);
- PrintPTEntry(info, PAGE_PT32, fault_addr, shadow_pte);
-#endif
/* Was the page fault caused by the Guest's page tables? */
if (is_guest_pf(guest_pte_access, shadow_pte_access) == 1) {
+
PrintDebug("Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n",
- guest_pte_access, *(uint_t*)&error_code);
- inject_guest_pf(info, fault_addr, error_code);
+ guest_pte_access, *(uint_t*)&error_code);
+
+ if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+ PrintError("Could not inject guest page fault\n");
+ return -1;
+ }
+
return 0;
}
addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_pa);
shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
+
+ PrintDebug("\tMapping shadow page (%p)\n", (void *)BASE_TO_PAGE_ADDR(shadow_pte->page_base_addr));
shadow_pte->present = guest_pte->present;
shadow_pte->user_page = guest_pte->user_page;
} else {
// Inject page fault into the guest
- inject_guest_pf(info, fault_addr, error_code);
+ if (inject_guest_pf(info, fault_addr, error_code) == -1) {
+ PrintError("Could not inject guest page fault\n");
+ return -1;
+ }
+
PrintError("PTE Page fault fell through... Not sure if this should ever happen\n");
PrintError("Manual Says to inject page fault into guest\n");
return -1;
}
- PrintDebug("Returning end of function\n");
return 0;
}
+static int handle_4MB_shadow_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 = 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);
+
+
+ PrintDebug("Handling 4MB fault (guest_fault_pa=%p) (error_code=%x)\n", (void *)guest_fault_pa, *(uint_t*)&error_code);
+ PrintDebug("ShadowPT=%p, LargeGuestPDE=%p\n", shadow_pt, large_guest_pde);
+
+ struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_fault_pa);
+
+
+ if (shdw_reg == NULL) {
+ // 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
+ PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
+ return 0;
+ }
+
+
+ if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
+ // Get the guest physical address of the fault
+
+ if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) ||
+ (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) {
+ addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_fault_pa);
+
+ shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
+
+ PrintDebug("\tMapping shadow page (%p)\n", (void *)BASE_TO_PAGE_ADDR(shadow_pte->page_base_addr));
+
+ 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 (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 = large_guest_pde->write_through;
+ shadow_pte->cache_disable = large_guest_pde->cache_disable;
+ shadow_pte->global_page = large_guest_pde->global_page;
+ //
+
+ } else {
+ 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) {
+
+ if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) {
+
+ 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 {
+ 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;
+}
+
+
+
+
+
+
+
+
+
+
+
+
/* If we start to optimize we should look up the guest pages in the cache... */
static inline int handle_shadow_invlpg_32(struct guest_info * info, addr_t vaddr) {
pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
