X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_shadow_paging_32.h;h=c358c3c374c9202e9f2dce75946bbdb280fedf69;hp=68766490cbcd09caccc77907f3610f0b25dfb8dc;hb=cfcc5717f659b3ed2954f41cf363d3bceae8dc84;hpb=3a47eb153e415d718e5d5601b79767b7335a149f diff --git a/palacios/src/palacios/vmm_shadow_paging_32.h b/palacios/src/palacios/vmm_shadow_paging_32.h index 6876649..c358c3c 100644 --- a/palacios/src/palacios/vmm_shadow_paging_32.h +++ b/palacios/src/palacios/vmm_shadow_paging_32.h @@ -1,84 +1,48 @@ +/* + * This file is part of the Palacios Virtual Machine Monitor developed + * by the V3VEE Project with funding from the United States National + * Science Foundation and the Department of Energy. + * + * The V3VEE Project is a joint project between Northwestern University + * and the University of New Mexico. You can find out more at + * http://www.v3vee.org + * + * Copyright (c) 2008, Jack Lange + * Copyright (c) 2008, The V3VEE Project + * All rights reserved. + * + * Author: Jack Lange + * + * This is free software. You are permitted to use, + * redistribute, and modify it as specified in the file "V3VEE_LICENSE". + */ -static int cache_page_tables_32(struct guest_info * info, addr_t pde) { - struct shadow_page_state * state = &(info->shdw_pg_state); - addr_t pde_host_addr; - pde32_t * tmp_pde; - struct hashtable * pte_cache = NULL; - int i = 0; - - if (pde == state->cached_cr3) { - return 1; - } - - if (state->cached_ptes != NULL) { - hashtable_destroy(state->cached_ptes, 0, 0); - state->cached_ptes = NULL; - } - - state->cached_cr3 = pde; - - pte_cache = create_hashtable(0, &pte_hash_fn, &pte_equals); - state->cached_ptes = pte_cache; - - if (guest_pa_to_host_va(info, pde, &pde_host_addr) == -1) { - PrintError("Could not lookup host address of guest PDE\n"); - return -1; - } - - tmp_pde = (pde32_t *)pde_host_addr; - - add_pte_map(pte_cache, pde, pde_host_addr); - - - for (i = 0; i < MAX_PDE32_ENTRIES; i++) { - if ((tmp_pde[i].present) && (tmp_pde[i].large_page == 0)) { - addr_t pte_host_addr; - - if (guest_pa_to_host_va(info, (addr_t)(BASE_TO_PAGE_ADDR(tmp_pde[i].pt_base_addr)), &pte_host_addr) == -1) { - PrintError("Could not lookup host address of guest PDE\n"); - return -1; - } - - add_pte_map(pte_cache, (addr_t)(BASE_TO_PAGE_ADDR(tmp_pde[i].pt_base_addr)), pte_host_addr); - } - } - - return 0; - -} -// 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 inline 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 = cache_page_tables_32(info, CR3_TO_PDE32_PA(*(addr_t *)guest_cr3)); - - if (cached == -1) { - PrintError("CR3 Cache failed\n"); - return -1; - } else if (cached == 0) { + 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); struct shadow_page_data * shdw_page = create_new_shadow_pt(info); 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)); - } else { - PrintDebug("Reusing cached shadow Page table\n"); - } - shadow_cr3->pwt = guest_cr3->pwt; - shadow_cr3->pcd = guest_cr3->pcd; + shadow_cr3->pwt = guest_cr3->pwt; + shadow_cr3->pcd = guest_cr3->pcd; - return 0; +#ifdef CONFIG_SYMBIOTIC_SWAP + v3_swap_flush(info); +#endif + + return 0; } + + + /* * * * * @@ -86,449 +50,468 @@ static inline int activate_shadow_pt_32(struct guest_info * info) { * * * * */ -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 * 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); - pt_access_status_t guest_pde_access; - pt_access_status_t shadow_pde_access; - pde32_t * guest_pde = NULL; - pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(fault_addr)]); - - PrintDebug("Shadow page fault handler: %p\n", (void*) fault_addr ); - - 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; - } - - guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(fault_addr)]); + 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); + pt_access_status_t guest_pde_access; + pt_access_status_t shadow_pde_access; + pde32_t * guest_pde = NULL; + 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); + return -1; + } + guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(fault_addr)]); - // Check the guest page permissions - guest_pde_access = v3_can_access_pde32(guest_pd, fault_addr, error_code); - // Check the shadow page permissions - shadow_pde_access = v3_can_access_pde32(shadow_pd, fault_addr, error_code); - - /* Was the page fault caused by the Guest's page tables? */ - 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); - return 0; - } + // Check the guest page permissions + guest_pde_access = v3_can_access_pde32(guest_pd, fault_addr, error_code); + // Check the shadow page permissions + shadow_pde_access = v3_can_access_pde32(shadow_pd, fault_addr, error_code); - 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 = 0; - shadow_pde->cache_disable = 0; - shadow_pde->global_page = 0; - // - - 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; + /* Was the page fault caused by the Guest's page tables? */ + if (is_guest_pf(guest_pde_access, shadow_pde_access) == 1) { + PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (shdw access error=%d) (pf error code=%d)\n", + *(uint_t *)&guest_pde_access, *(uint_t *)&shadow_pde_access, *(uint_t *)&error_code); + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + 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; - } - - } + return 0; } - 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; + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + 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; + 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 for vaddr %p\n", (void *)fault_addr); + 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(PAGE_PD32, fault_addr, guest_pde); - PrintDebug("Shadow PDE: (access=%d)\n\t", shadow_pde_access); - PrintPTEntry(PAGE_PD32, fault_addr, shadow_pde); -#endif - - return 0; + PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access); + PrintDebug("Manual Says to inject page fault into guest\n"); + return 0; } - PrintDebug("Returning end of PDE function (rip=%p)\n", (void *)(addr_t)(info->rip)); - return 0; -} + + pte32_t * shadow_pt = NULL; + pte32_t * guest_pt = NULL; + // Get the next shadow page level, allocate if not present + 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); -/* 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 shadow_page_state * state = &(info->shdw_pg_state); + shadow_pde->present = 1; + shadow_pde->user_page = guest_pde->user_page; - 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 - PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n"); - return 0; - } + if (guest_pde->large_page == 0) { + shadow_pde->writable = guest_pde->writable; + } else { + // This large page flag is temporary until we can get a working cache.... + ((pde32_4MB_t *)guest_pde)->vmm_info = V3_LARGE_PG; + + 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; + } + } + - - 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); - - 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, 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->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; - shadow_pte->global_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; - } 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 (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; - } + 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 (find_pte_map(state->cached_ptes, PAGE_ADDR(guest_fault_pa)) != NULL) { - 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 (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; + } - } 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_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 { + 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; + return 0; } +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; + 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); -/* - * 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) { - - pt_access_status_t guest_pte_access; - 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 shadow_page_state * state = &(info->shdw_pg_state); - - 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; - } + struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_pa); - // Check the guest page permissions - guest_pte_access = v3_can_access_pte32(guest_pt, fault_addr, error_code); + if (shdw_reg == NULL) { + // 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); - // Check the shadow page permissions - shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code); + // 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(PAGE_PT32, fault_addr, guest_pte); - PrintDebug("Shadow PTE: (access=%d)\n\t", shadow_pte_access); - PrintPTEntry(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); - return 0; - } + /* 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); + +#ifdef CONFIG_SYMBIOTIC_SWAP + if (is_swapped_pte32(guest_pte)) { + pf_error_t swap_perms; + +#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY + if (error_code.write == 0) { + info->swap_state.read_faults++; + } else { + info->swap_state.write_faults++; + } +#endif + + if (v3_get_vaddr_perms(info, fault_addr, guest_pte, &swap_perms) == -1) { + PrintError("Error getting Swapped page permissions\n"); + return -1; + } + + + // swap_perms.write == 1 || error_code.write == 0 + // swap_perms.user == 0 || error_code.user == 1 + + // This checks for permissions violations that require a guest PF injection + if ( (swap_perms.present == 1) && + ( (swap_perms.write == 1) || + (error_code.write == 0) ) && + ( (swap_perms.user == 1) || + (error_code.user == 0) ) ) { + addr_t swp_pg_addr = 0; + + PrintDebug("Page fault on swapped out page (vaddr=%p) (pte=%x) (error_code=%x)\n", + (void *)fault_addr, *(uint32_t *)guest_pte, *(uint32_t *)&error_code); + + swp_pg_addr = v3_get_swapped_pg_addr(info, shadow_pte, guest_pte); + + PrintDebug("Swapped page address=%p\n", (void *)swp_pg_addr); + + if (swp_pg_addr != 0) { + shadow_pte->writable = swap_perms.write; + shadow_pte->user_page = swap_perms.user; + + shadow_pte->write_through = 0; + shadow_pte->cache_disable = 0; + shadow_pte->global_page = 0; + + shadow_pte->present = 1; + + shadow_pte->page_base_addr = swp_pg_addr; + +#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY + info->swap_state.mapped_pages++; +#endif + + return 0; + } + } else { + PrintDebug("Not a sym swappable page\n"); + } + } +#endif + + + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; + } + + return 0; + } - if (shadow_pte_access == PT_ACCESS_OK) { - // Inconsistent state... - // Guest Re-Entry will flush page tables and everything should now work - PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n"); - return 0; - } + if (shadow_pte_access == PT_ACCESS_OK) { + // Inconsistent state... + // Guest Re-Entry will flush page tables and everything should now work + PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n"); + return 0; + } - if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) { - // Page Table Entry Not Present - PrintDebug("guest_pa =%p\n", (void *)guest_pa); + if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) { + // Page Table Entry Not Present + PrintDebug("guest_pa =%p\n", (void *)guest_pa); - 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_pa); + 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_pa); - shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_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; + shadow_pte->present = guest_pte->present; + shadow_pte->user_page = guest_pte->user_page; - //set according to VMM policy - shadow_pte->write_through = 0; - shadow_pte->cache_disable = 0; - shadow_pte->global_page = 0; - // + //set according to VMM policy + shadow_pte->write_through = guest_pte->write_through; + shadow_pte->cache_disable = guest_pte->cache_disable; + shadow_pte->global_page = guest_pte->global_page; + // - guest_pte->accessed = 1; + guest_pte->accessed = 1; - 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; + 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; + guest_pte->dirty = 1; + } else if ((guest_pte->dirty == 0) && (error_code.write == 0)) { + shadow_pte->writable = 0; + } + + + + // Write hooks trump all, and are set Read Only + if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { + shadow_pte->writable = 0; + } + + } else { + // Page fault handled by hook functions + + 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 = 1; - } else if ((guest_pte->dirty == 0) && (error_code.write == 0)) { - shadow_pte->writable = 0; - } - - // dirty flag has been set, check if its in the cache - if (find_pte_map(state->cached_ptes, PAGE_ADDR(guest_pa)) != NULL) { - if (error_code.write == 1) { - state->cached_cr3 = 0; - 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 { - shadow_pte->writable = 0; + PrintDebug("Shadow PTE Write Error\n"); + shadow_pte->writable = guest_pte->writable; } - } - // Write hooks trump all, and are set Read Only - if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { - shadow_pte->writable = 0; - } + + return 0; } else { - // Page fault handled by hook functions + // Inject page fault into the guest + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -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); + 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; - } } - } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) { - guest_pte->dirty = 1; - 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 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; - } - } else { - PrintDebug("Shadow PTE Write Error\n"); - shadow_pte->writable = guest_pte->writable; } - if (find_pte_map(state->cached_ptes, PAGE_ADDR(guest_pa)) != NULL) { - struct shadow_page_state * state = &(info->shdw_pg_state); - PrintDebug("Write operation on Guest PAge Table Page\n"); - state->cached_cr3 = 0; + 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; } - 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); - } else { - // Inject page fault into the guest - inject_guest_pf(info, fault_addr, error_code); - 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; - } + shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa); - PrintDebug("Returning end of function\n"); - return 0; + 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); - pde32_t * shadow_pde = (pde32_t *)&shadow_pd[PDE32_INDEX(vaddr)]; + pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32_VA(info->ctrl_regs.cr3); + pde32_t * shadow_pde = (pde32_t *)&shadow_pd[PDE32_INDEX(vaddr)]; - addr_t guest_cr3 = CR3_TO_PDE32_PA(info->shdw_pg_state.guest_cr3); - pde32_t * guest_pd = NULL; - pde32_t * guest_pde; + addr_t guest_cr3 = CR3_TO_PDE32_PA(info->shdw_pg_state.guest_cr3); + pde32_t * guest_pd = NULL; + pde32_t * guest_pde; - 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; - } + 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; + } - guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(vaddr)]); + guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(vaddr)]); - 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)BASE_TO_PAGE_ADDR_4KB(shadow_pde->pt_base_addr); - pte32_t * shadow_pte = (pte32_t *) V3_VAddr( (void*) &shadow_pt[PTE32_INDEX(vaddr)] ); + 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)BASE_TO_PAGE_ADDR_4KB(shadow_pde->pt_base_addr); + pte32_t * shadow_pte = (pte32_t *) V3_VAddr( (void*) &shadow_pt[PTE32_INDEX(vaddr)] ); - PrintDebug("Setting not present\n"); + PrintDebug("Setting not present\n"); - shadow_pte->present = 0; - } - return 0; + shadow_pte->present = 0; + } + return 0; }