X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_shadow_paging.c;h=99e1431cd71214dc64d40b025641e2746dfb9752;hb=f1d070a7d98fea4d37069555d653e37524f50ac8;hp=7dc642202432efa6a4ac7636dbef4950c14c2b47;hpb=f84bd0ca67af7c0a1143d5e279e0af408729128e;p=palacios.git diff --git a/palacios/src/palacios/vmm_shadow_paging.c b/palacios/src/palacios/vmm_shadow_paging.c index 7dc6422..99e1431 100644 --- a/palacios/src/palacios/vmm_shadow_paging.c +++ b/palacios/src/palacios/vmm_shadow_paging.c @@ -1,9 +1,30 @@ +/* + * 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". + */ + + #include #include #include #include +#include #ifndef DEBUG_SHADOW_PAGING #undef PrintDebug @@ -30,7 +51,6 @@ DEFINE_HASHTABLE_REMOVE(del_pte_map, addr_t, addr_t, 0); - static uint_t pte_hash_fn(addr_t key) { return hash_long(key, 32); } @@ -48,6 +68,12 @@ static int cr3_equals(addr_t key1, addr_t key2) { } + +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, @@ -56,14 +82,11 @@ static int handle_shadow_pte32_fault(struct guest_info* info, static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code); -int init_shadow_page_state(struct guest_info * info) { +int v3_init_shadow_page_state(struct guest_info * info) { struct shadow_page_state * state = &(info->shdw_pg_state); - state->guest_mode = PDE32; - state->shadow_mode = PDE32; state->guest_cr3 = 0; - state->shadow_cr3 = 0; - + state->guest_cr0 = 0; state->cr3_cache = create_hashtable(0, &cr3_hash_fn, &cr3_equals); @@ -126,7 +149,17 @@ int cache_page_tables32(struct guest_info * info, addr_t pde) { } */ -int cache_page_tables32(struct guest_info * info, addr_t pde) { + +int v3_cache_page_tables(struct guest_info * info, addr_t cr3) { + switch(v3_get_cpu_mode(info)) { + case PROTECTED: + return v3_cache_page_tables32(info, (addr_t)V3_PAddr((void *)CR3_TO_PDE32(cr3))); + default: + return -1; + } +} + +int v3_cache_page_tables32(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; @@ -147,7 +180,7 @@ int cache_page_tables32(struct guest_info * info, addr_t pde) { pte_cache = create_hashtable(0, &pte_hash_fn, &pte_equals); state->cached_ptes = pte_cache; - if (guest_pa_to_host_pa(info, pde, &pde_host_addr) == -1) { + if (guest_pa_to_host_va(info, pde, &pde_host_addr) == -1) { PrintError("Could not lookup host address of guest PDE\n"); return -1; } @@ -161,7 +194,7 @@ int cache_page_tables32(struct guest_info * info, addr_t pde) { if ((tmp_pde[i].present) && (tmp_pde[i].large_page == 0)) { addr_t pte_host_addr; - if (guest_pa_to_host_pa(info, (addr_t)(PDE32_T_ADDR(tmp_pde[i])), &pte_host_addr) == -1) { + if (guest_pa_to_host_va(info, (addr_t)(PDE32_T_ADDR(tmp_pde[i])), &pte_host_addr) == -1) { PrintError("Could not lookup host address of guest PDE\n"); return -1; } @@ -177,11 +210,11 @@ int cache_page_tables32(struct guest_info * info, addr_t pde) { 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) { - pte32_t * shadow_pt = (pte32_t *)PDE32_T_ADDR((*shadow_pde)); + pte32_t * shadow_pt = (pte32_t *)(addr_t)PDE32_T_ADDR((*shadow_pde)); pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(location)]); //if (shadow_pte->present == 1) { @@ -202,11 +235,81 @@ int v3_replace_shdw_page32(struct guest_info * info, addr_t location, pte32_t * +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 handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) { +int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) { if (info->mem_mode == PHYSICAL_MEM) { // If paging is not turned on we need to handle the special cases + +#ifdef DEBUG_SHADOW_PAGING + PrintPageTree(info->cpu_mode, fault_addr, info->ctrl_regs.cr3); +#endif + return handle_special_page_fault(info, fault_addr, fault_addr, error_code); } else if (info->mem_mode == VIRTUAL_MEM) { @@ -226,10 +329,10 @@ int handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_erro } } -addr_t create_new_shadow_pt32() { +addr_t v3_create_new_shadow_pt() { void * host_pde = 0; - host_pde = V3_AllocPages(1); + host_pde = V3_VAddr(V3_AllocPages(1)); memset(host_pde, 0, PAGE_SIZE); return (addr_t)host_pde; @@ -302,7 +405,7 @@ static int handle_large_pagefault32(struct guest_info * info, if (host_page_type == HOST_REGION_INVALID) { // Inject a machine check in the guest - PrintDebug("Invalid Guest Address in page table (0x%x)\n", guest_fault_pa); + PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa); v3_raise_exception(info, MC_EXCEPTION); return 0; } @@ -341,7 +444,7 @@ static int handle_large_pagefault32(struct guest_info * info, } 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: %x\n", fault_addr); + PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr); return -1; } } @@ -366,17 +469,17 @@ static int handle_large_pagefault32(struct guest_info * info, 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 = 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; pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(fault_addr)]); - PrintDebug("Shadow page fault handler\n"); + 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%x\n", guest_cr3); + PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3); return -1; } @@ -392,7 +495,7 @@ static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr /* 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", - guest_pde_access, error_code); + *(uint_t *)&guest_pde_access, *(uint_t *)&error_code); inject_guest_pf(info, fault_addr, error_code); return 0; } @@ -400,7 +503,7 @@ static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr if (shadow_pde_access == PT_ENTRY_NOT_PRESENT) { - pte32_t * shadow_pt = (pte32_t *)create_new_shadow_pt32(); + pte32_t * shadow_pt = (pte32_t *)v3_create_new_shadow_pt(); shadow_pde->present = 1; shadow_pde->user_page = guest_pde->user_page; @@ -416,11 +519,12 @@ static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr guest_pde->accessed = 1; - shadow_pde->pt_base_addr = PD32_BASE_ADDR(shadow_pt); + shadow_pde->pt_base_addr = PD32_BASE_ADDR((addr_t)V3_PAddr(shadow_pt)); if (guest_pde->large_page == 0) { shadow_pde->writable = guest_pde->writable; } else { + // ?? What if guest pde is dirty a this point? ((pde32_4MB_t *)guest_pde)->dirty = 0; shadow_pde->writable = 0; } @@ -430,7 +534,7 @@ static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr // // PTE fault // - pte32_t * shadow_pt = (pte32_t *)PDE32_T_ADDR((*shadow_pde)); + pte32_t * shadow_pt = (pte32_t *)V3_VAddr( (void*)(addr_t) PDE32_T_ADDR(*shadow_pde) ); if (guest_pde->large_page == 0) { pte32_t * guest_pt = NULL; @@ -493,7 +597,7 @@ static int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr return 0; } - PrintDebug("Returning end of PDE function (rip=%x)\n", info->rip); + PrintDebug("Returning end of PDE function (rip=%p)\n", (void *)(addr_t)(info->rip)); return 0; } @@ -554,7 +658,7 @@ static int handle_shadow_pte32_fault(struct guest_info * info, if (host_page_type == HOST_REGION_INVALID) { // Inject a machine check in the guest - PrintDebug("Invalid Guest Address in page table (0x%x)\n", guest_pa); + PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_pa); v3_raise_exception(info, MC_EXCEPTION); return 0; } @@ -580,7 +684,7 @@ static int handle_shadow_pte32_fault(struct guest_info * info, if (find_pte_map(state->cached_ptes, PT32_PAGE_ADDR(guest_pa)) != NULL) { // Check if the entry is a page table... - PrintDebug("Marking page as Guest Page Table\n", shadow_pte->writable); + PrintDebug("Marking page as Guest Page Table %d\n", shadow_pte->writable); shadow_pte->vmm_info = PT32_GUEST_PT; } @@ -597,7 +701,7 @@ static int handle_shadow_pte32_fault(struct guest_info * info, state->cached_cr3 = 0; } - } else if ((guest_pte->dirty = 0) && (error_code.write == 0)) { + } else if ((guest_pte->dirty == 0) && (error_code.write == 0)) { // was = shadow_pte->writable = 0; } @@ -606,7 +710,7 @@ static int handle_shadow_pte32_fault(struct guest_info * info, } else { // Page fault handled by hook functions if (handle_special_page_fault(info, fault_addr, guest_pa, error_code) == -1) { - PrintError("Special Page fault handler returned error for address: %x\n", fault_addr); + PrintError("Special Page fault handler returned error for address: %p\n", (void *)fault_addr); return -1; } } @@ -644,98 +748,92 @@ static int handle_shadow_pte32_fault(struct guest_info * info, /* Currently Does not work with Segmentation!!! */ -int handle_shadow_invlpg(struct guest_info * info) { +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) { - char instr[15]; - int ret; - int index = 0; - - 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%x (ret=%d)\n", info->rip, ret); - return -1; - } - - - /* Can INVLPG work with Segments?? */ - while (is_prefix_byte(instr[index])) { - index++; - } + + + 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] == (uchar_t)0x0f) && - (instr[index + 1] == (uchar_t)0x01)) { - - addr_t first_operand; - addr_t second_operand; - operand_type_t addr_type; - addr_t guest_cr3 = 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%x\n", guest_cr3); - return -1; - } + 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)] ); - - - index += 2; - - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); - - if (addr_type == MEM_OPERAND) { - 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 %x\n", 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 *)PDE32_T_ADDR((*shadow_pde)); - pte32_t * shadow_pte = (pte32_t *)&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; - - } else { - PrintError("Invalid Operand type\n"); - return -1; - } - } else { - PrintError("invalid Instruction Opcode\n"); - PrintTraceMemDump(instr, 15); - return -1; + + shadow_pte->present = 0; } - } - + + info->rip += index; + return 0; }