X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_shadow_paging.c;h=9650f135cb0f528b44fd2bf35b405f22d430f93e;hb=2f8874213ef55452fd063eec4a87536454a2c40f;hp=360e5322260681367ece97f54c44759780cbd001;hpb=41d6dcb0a638ebdc01b89a9edf427c75975b2003;p=palacios.git diff --git a/palacios/src/palacios/vmm_shadow_paging.c b/palacios/src/palacios/vmm_shadow_paging.c index 360e532..9650f13 100644 --- a/palacios/src/palacios/vmm_shadow_paging.c +++ b/palacios/src/palacios/vmm_shadow_paging.c @@ -1,433 +1,544 @@ +/* + * 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 +#include +#include -int init_shadow_page_state(struct shadow_page_state * state) { - state->guest_mode = PDE32; - state->shadow_mode = PDE32; - - state->guest_cr3 = 0; - state->shadow_cr3 = 0; - return 0; -} -int 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 - return handle_special_page_fault(info, fault_addr, error_code); - } else if (info->mem_mode == VIRTUAL_MEM) { - - switch (info->cpu_mode) { - case PROTECTED: - return handle_shadow_pagefault32(info, fault_addr, error_code); - break; - case PROTECTED_PAE: - case LONG: - // currently not handled - return -1; - break; - default: - return -1; - } - } else { - PrintDebug("Invalid Memory mode\n"); - return -1; - } -} +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY +#include +#endif -int handle_shadow_pagefault32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) { - pde32_t * guest_pde = NULL; - pde32_t * shadow_pde = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3); - addr_t guest_cr3 = 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_entry = NULL; - pde32_t * shadow_pde_entry = (pde32_t *)&(shadow_pde[PDE32_INDEX(fault_addr)]); +#ifdef V3_CONFIG_SYMBIOTIC_SWAP +#include +#endif - if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pde) == -1) { - PrintDebug("Invalid Guest PDE Address: 0x%x\n", guest_cr3); - return -1; - } +#ifndef V3_CONFIG_DEBUG_SHADOW_PAGING +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif - guest_pde_entry = (pde32_t *)&(guest_pde[PDE32_INDEX(fault_addr)]); +static const char default_strategy[] = "VTLB"; - // Check the guest page permissions - guest_pde_access = can_access_pde32(guest_pde, fault_addr, error_code); - if (guest_pde_access != PT_ACCESS_OK) { - // inject page fault to the guest (Guest PDE fault) +static struct hashtable * master_shdw_pg_table = NULL; - info->ctrl_regs.cr2 = fault_addr; - raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code); - return 0; - } +struct event_callback { + int (*callback)(struct guest_info *core, struct v3_shdw_pg_event *event, void *priv_data); + void *priv_data; - shadow_pde_access = can_access_pde32(shadow_pde, fault_addr, error_code); + struct list_head node; +}; +static uint_t shdw_pg_hash_fn(addr_t key) { + char * name = (char *)key; + return v3_hash_buffer((uint8_t *)name, strlen(name)); +} - if (shadow_pde_access == PT_ENTRY_NOT_PRESENT) { - pte32_t * shadow_pte = NULL; +static int shdw_pg_eq_fn(addr_t key1, addr_t key2) { + char * name1 = (char *)key1; + char * name2 = (char *)key2; - V3_AllocPages(shadow_pte, 1); - memset(shadow_pte, 0, PAGE_SIZE); + return (strcmp(name1, name2) == 0); +} - shadow_pde_entry->pt_base_addr = PD32_BASE_ADDR(shadow_pte); - +static int have_callbacks(struct guest_info *core) +{ + // lock acquistion unnecessary + // caller will acquire the lock before *iterating* through the list + // so any race will be resolved then + return !list_empty(&(core->vm_info->shdw_impl.event_callback_list)); +} - shadow_pde_entry->present = 1; - shadow_pde_entry->user_page = guest_pde_entry->user_page; - - // VMM Specific options - shadow_pde_entry->write_through = 0; - shadow_pde_entry->cache_disable = 0; - shadow_pde_entry->global_page = 0; - // +static void dispatch_event(struct guest_info *core, struct v3_shdw_pg_event *event) +{ + struct event_callback *cb,*temp; - guest_pde_entry->accessed = 1; + v3_read_lock(&(core->vm_info->shdw_impl.event_callback_lock)); - if (guest_pde_entry->large_page == 0) { - shadow_pde_entry->writable = guest_pde_entry->writable; - } else { - /* - * Check the Intel manual because we are ignoring Large Page issues here - * Also be wary of hooked pages - */ + list_for_each_entry_safe(cb, + temp, + &(core->vm_info->shdw_impl.event_callback_list), + node) { + cb->callback(core,event,cb->priv_data); } - } else if (shadow_pde_access == PT_WRITE_ERROR) { + v3_read_unlock(&(core->vm_info->shdw_impl.event_callback_lock)); +} - // - // Page Directory Entry marked read-only - // - PrintDebug("Shadow Paging Write Error\n"); - return -1; - } else if (shadow_pde_access == PT_USER_ERROR) { +int V3_init_shdw_paging() { + extern struct v3_shdw_pg_impl * __start__v3_shdw_pg_impls[]; + extern struct v3_shdw_pg_impl * __stop__v3_shdw_pg_impls[]; + struct v3_shdw_pg_impl ** tmp_impl = __start__v3_shdw_pg_impls; + int i = 0; - // - // Page Directory Entry marked non-user - // - - PrintDebug("Shadow Paging User access error\n"); - return -1; - } else if (shadow_pde_access == PT_ACCESS_OK) { - pte32_t * shadow_pte = (pte32_t *)PDE32_T_ADDR((*shadow_pde_entry)); - pte32_t * guest_pte = NULL; + master_shdw_pg_table = v3_create_htable(0, shdw_pg_hash_fn, shdw_pg_eq_fn); - // Page Table Entry fault - - if (guest_pa_to_host_va(info, PDE32_T_ADDR((*guest_pde_entry)), (addr_t*)&guest_pte) == -1) { - PrintDebug("Invalid Guest PTE Address: 0x%x\n", PDE32_T_ADDR((*guest_pde_entry))); - // Machine check the guest - raise_exception(info, MC_EXCEPTION); - - return 0; - } + while (tmp_impl != __stop__v3_shdw_pg_impls) { + V3_Print(VM_NONE, VCORE_NONE, "Registering Shadow Paging Impl (%s)\n", (*tmp_impl)->name); + + if (v3_htable_search(master_shdw_pg_table, (addr_t)((*tmp_impl)->name))) { + PrintError(VM_NONE, VCORE_NONE, "Multiple instances of shadow paging impl (%s)\n", (*tmp_impl)->name); + return -1; + } + if (v3_htable_insert(master_shdw_pg_table, + (addr_t)((*tmp_impl)->name), + (addr_t)(*tmp_impl)) == 0) { + PrintError(VM_NONE, VCORE_NONE, "Could not register shadow paging impl (%s)\n", (*tmp_impl)->name); + return -1; + } - if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pte, guest_pte) == -1) { - PrintDebug("Error handling Page fault caused by PTE\n"); - return -1; + tmp_impl = &(__start__v3_shdw_pg_impls[++i]); } - } else { - // Unknown error raise page fault in guest - info->ctrl_regs.cr2 = fault_addr; - raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code); + return 0; +} - // For debugging we will return an error here for the time being, - // this probably shouldn't ever happen - PrintDebug("Unknown Error occurred\n"); - PrintDebug("Manual Says to inject page fault into guest\n"); - return -1; - } +int V3_deinit_shdw_paging() { + v3_free_htable(master_shdw_pg_table, 0, 0); + return 0; +} - //PrintDebugPageTables(shadow_pde); - return 0; -} +/*** + *** There be dragons + ***/ -/* - * We assume the the guest pte pointer has already been translated to a host virtual address - */ -int handle_shadow_pte32_fault(struct guest_info * info, - addr_t fault_addr, - pf_error_t error_code, - pte32_t * shadow_pte, - pte32_t * guest_pte) { +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY +static void telemetry_cb(struct v3_vm_info * vm, void * private_data, char * hdr) { + int i = 0; + for (i = 0; i < vm->num_cores; i++) { + struct guest_info * core = &(vm->cores[i]); - pt_access_status_t guest_pte_access; - pt_access_status_t shadow_pte_access; - pte32_t * guest_pte_entry = (pte32_t *)&(guest_pte[PTE32_INDEX(fault_addr)]);; - pte32_t * shadow_pte_entry = (pte32_t *)&(shadow_pte[PTE32_INDEX(fault_addr)]); + V3_Print(vm, core, "%s Guest Page faults: %d\n", hdr, core->shdw_pg_state.guest_faults); + } +} +#endif - // Check the guest page permissions - guest_pte_access = can_access_pte32(guest_pte, fault_addr, error_code); +int v3_init_shdw_pg_state(struct guest_info * core) { + struct v3_shdw_pg_state * state = &(core->shdw_pg_state); + struct v3_shdw_pg_impl * impl = core->vm_info->shdw_impl.current_impl; - if (guest_pte_access != PT_ACCESS_OK) { - // Inject page fault into the guest - - info->ctrl_regs.cr2 = fault_addr; - raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code); - - return 0; - } - + + state->guest_cr3 = 0; + state->guest_cr0 = 0; + state->guest_efer.value = 0x0LL; + + if (impl->local_init(core) == -1) { + PrintError(core->vm_info, core, "Error in Shadow paging local initialization (%s)\n", impl->name); + return -1; + } + + +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY + v3_add_telemetry_cb(core->vm_info, telemetry_cb, NULL); +#endif - shadow_pte_access = can_access_pte32(shadow_pte, fault_addr, error_code); - if (shadow_pte_access == PT_ACCESS_OK) { - // Inconsistent state... - // Guest Re-Entry will flush page tables and everything should now work return 0; - } else if (shadow_pte_access == PT_ENTRY_NOT_PRESENT) { - addr_t shadow_pa; - addr_t guest_pa = PTE32_T_ADDR((*guest_pte_entry)); - - // Page Table Entry Not Present - - 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 - - raise_exception(info, MC_EXCEPTION); - - PrintDebug("Invalid Guest Address in page table (0x%x)\n", guest_pa); - return 0; - - } else if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) { - - shadow_pa = get_shadow_addr(info, guest_pa); - - shadow_pte_entry->page_base_addr = PT32_BASE_ADDR(shadow_pa); - - shadow_pte_entry->present = guest_pte_entry->present; - shadow_pte_entry->user_page = guest_pte_entry->user_page; - - //set according to VMM policy - shadow_pte_entry->write_through = 0; - shadow_pte_entry->cache_disable = 0; - shadow_pte_entry->global_page = 0; - // - - guest_pte_entry->accessed = 1; - - if (guest_pte_entry->dirty == 1) { - shadow_pte_entry->writable = guest_pte_entry->writable; - } else if ((guest_pte_entry->dirty == 0) && (error_code.write == 1)) { - shadow_pte_entry->writable = guest_pte_entry->writable; - guest_pte_entry->dirty = 1; - } else if ((guest_pte_entry->dirty = 0) && (error_code.write == 0)) { - shadow_pte_entry->writable = 0; - } - } else { - // Page fault handled by hook functions - if (handle_special_page_fault(info, fault_addr, error_code) == -1) { - PrintDebug("Special Page fault handler returned error for address: %x\n", fault_addr); +} + + +int v3_deinit_shdw_pg_state(struct guest_info * core) { + struct v3_shdw_pg_impl * impl = NULL; + + if (!core || !core->vm_info) { + return -1; + } + + impl = core->vm_info->shdw_impl.current_impl; + + if (impl && impl->local_deinit(core) == -1) { + PrintError(core->vm_info, core, "Error deinitializing shadow paging state\n"); return -1; - } } - } else if ((shadow_pte_access == PT_WRITE_ERROR) && - (guest_pte_entry->dirty == 0)) { - guest_pte_entry->dirty = 1; - shadow_pte_entry->writable = guest_pte_entry->writable; return 0; - } else { - // Inject page fault into the guest +} + + + +int v3_init_shdw_impl(struct v3_vm_info * vm) { + struct v3_shdw_impl_state * impl_state = &(vm->shdw_impl); + v3_cfg_tree_t * pg_cfg = v3_cfg_subtree(vm->cfg_data->cfg, "paging"); + char * pg_mode = v3_cfg_val(pg_cfg, "mode"); + char * pg_strat = v3_cfg_val(pg_cfg, "strategy"); + struct v3_shdw_pg_impl * impl = NULL; + + PrintDebug(vm, VCORE_NONE, "Checking if shadow paging requested.\n"); + if (pg_mode == NULL) { + V3_Print(vm, VCORE_NONE, "No paging mode specified, assuming shadow with defaults\n"); + pg_mode = "shadow"; + } else { + if (strcasecmp(pg_mode, "nested") == 0) { + // this check is repeated here (compare to vmm_config's determine paging mode) since + // shadow paging initialization *precedes* per-core pre-config. + extern v3_cpu_arch_t v3_mach_type; + if ((v3_mach_type == V3_SVM_REV3_CPU) || + (v3_mach_type == V3_VMX_EPT_CPU) || + (v3_mach_type == V3_VMX_EPT_UG_CPU)) { + PrintDebug(vm, VCORE_NONE, "Nested paging specified on machine that supports it - not initializing shadow paging\n"); + return 0; + } else { + V3_Print(vm, VCORE_NONE, "Nested paging specified but machine does not support it - falling back to shadow paging with defaults\n"); + pg_mode = "shadow"; + } + } else if (strcasecmp(pg_mode, "shadow") != 0) { + V3_Print(vm, VCORE_NONE, "Unknown paging mode '%s' specified - falling back to shadow paging with defaults\n",pg_mode); + pg_mode = "shadow"; + } + } + + if (pg_strat == NULL) { + pg_strat = (char *)default_strategy; + } - info->ctrl_regs.cr2 = fault_addr; - raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code); + V3_Print(vm, VCORE_NONE,"Initialization of Shadow Paging implementation\n"); - PrintDebug("PTE Page fault fell through... Not sure if this should ever happen\n"); - PrintDebug("Manual Says to inject page fault into guest\n"); - return -1; - } + impl = (struct v3_shdw_pg_impl *)v3_htable_search(master_shdw_pg_table, (addr_t)pg_strat); - return 0; + if (impl == NULL) { + PrintError(vm, VCORE_NONE, "Could not find shadow paging impl (%s)\n", pg_strat); + return -1; + } + + INIT_LIST_HEAD(&(impl_state->event_callback_list)); + v3_rw_lock_init(&(impl_state->event_callback_lock)); + + impl_state->current_impl = impl; + + if (impl->init(vm, pg_cfg) == -1) { + PrintError(vm, VCORE_NONE, "Could not initialize Shadow paging implemenation (%s)\n", impl->name); + return -1; + } + + + + return 0; } +int v3_deinit_shdw_impl(struct v3_vm_info * vm) { + struct v3_shdw_pg_impl * impl = vm->shdw_impl.current_impl; + struct event_callback *cb,*temp; + addr_t flags; + + if (impl == NULL) { + // Shadow paging not implemented + return 0; + } + + if (impl->deinit(vm) == -1) { + PrintError(vm, VCORE_NONE,"Error deinitializing shadow paging implementation\n"); + return -1; + } + + flags=v3_write_lock_irqsave(&(vm->shdw_impl.event_callback_lock)); + + list_for_each_entry_safe(cb, + temp, + &(vm->shdw_impl.event_callback_list), + node) { + list_del(&(cb->node)); + V3_Free(cb); + } + + v3_write_unlock_irqrestore(&(vm->shdw_impl.event_callback_lock),flags); + + v3_rw_lock_deinit(&(vm->shdw_impl.event_callback_lock)); + + return 0; +} -addr_t create_new_shadow_pt32(struct guest_info * info) { - void * host_pde = 0; +// 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 * core) { + struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl); + struct v3_shdw_pg_impl * impl = state->current_impl; + + if (!have_callbacks(core)) { + return impl->activate_shdw_pt(core); + } else { + int rc; + struct v3_shdw_pg_event event_pre={SHADOW_ACTIVATE,SHADOW_PREIMPL,0,{0,0,0,0,0,0}}; + struct v3_shdw_pg_event event_post={SHADOW_ACTIVATE,SHADOW_POSTIMPL,0,{0,0,0,0,0,0}}; + + dispatch_event(core,&event_pre); - V3_AllocPages(host_pde, 1); - memset(host_pde, 0, PAGE_SIZE); + rc =impl->activate_shdw_pt(core); - return (addr_t)host_pde; + dispatch_event(core,&event_post); + + return rc; + } } -/* Currently Does not work with Segmentation!!! */ -int 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 - PrintDebug("ERROR: INVLPG called in non paged mode\n"); - return -1; - } +// This must flush any caches +// and reset the cr3 value to the correct value +int v3_invalidate_shadow_pts(struct guest_info * core) { + struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl); + struct v3_shdw_pg_impl * impl = state->current_impl; + if (!have_callbacks(core)) { + return impl->invalidate_shdw_pt(core); + } else { + int rc; + struct v3_shdw_pg_event event_pre={SHADOW_INVALIDATE,SHADOW_PREIMPL,0,{0,0,0,0,0,0}}; + struct v3_shdw_pg_event event_post={SHADOW_INVALIDATE,SHADOW_POSTIMPL,0,{0,0,0,0,0,0}}; + + dispatch_event(core,&event_pre); - if (info->cpu_mode == PROTECTED) { - char instr[15]; - int ret; - int index = 0; + rc = impl->invalidate_shdw_pt(core); - ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr); - if (ret != 15) { - PrintDebug("Could not read instruction 0x%x (ret=%d)\n", info->rip, ret); - return -1; + dispatch_event(core,&event_post); + + return rc; } +} + +int v3_handle_shadow_pagefault(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) +{ + int rc; - /* Can INVLPG work with Segments?? */ - while (is_prefix_byte(instr[index])) { - index++; + + if (have_callbacks(core)) { + struct v3_shdw_pg_event event={SHADOW_PAGEFAULT,SHADOW_PREIMPL,fault_addr,error_code}; + dispatch_event(core,&event); + } + + if (v3_get_vm_mem_mode(core) == PHYSICAL_MEM) { + // If paging is not turned on we need to handle the special cases + rc = v3_handle_passthrough_pagefault(core, fault_addr, error_code,NULL,NULL); + } else if (v3_get_vm_mem_mode(core) == VIRTUAL_MEM) { + struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl); + struct v3_shdw_pg_impl * impl = state->current_impl; + + rc = impl->handle_pagefault(core, fault_addr, error_code); + } else { + PrintError(core->vm_info, core, "Invalid Memory mode\n"); + rc = -1; } + if (have_callbacks(core)) { + struct v3_shdw_pg_event event={SHADOW_PAGEFAULT,SHADOW_POSTIMPL,fault_addr,error_code}; + dispatch_event(core,&event); + } - if ((instr[index] == (uchar_t)0x0f) && - (instr[index + 1] == (uchar_t)0x01)) { + return rc; +} - addr_t first_operand; - addr_t second_operand; - operand_type_t addr_type; - index += 2; +int v3_handle_shadow_invlpg(struct guest_info * core) { + uchar_t instr[15]; + struct x86_instr dec_instr; + int ret = 0; + addr_t vaddr = 0; - addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32); + if (v3_get_vm_mem_mode(core) != VIRTUAL_MEM) { + // Paging must be turned on... + // should handle with some sort of fault I think + PrintError(core->vm_info, core, "ERROR: INVLPG called in non paged mode\n"); + return -1; + } - if (addr_type == MEM_OPERAND) { - pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32(info->shdw_pg_state.shadow_cr3); - pde32_t * shadow_pde_entry = (pde32_t *)&shadow_pd[PDE32_INDEX(first_operand)]; + if (v3_get_vm_mem_mode(core) == PHYSICAL_MEM) { + ret = v3_read_gpa_memory(core, get_addr_linear(core, core->rip, &(core->segments.cs)), 15, instr); + } else { + ret = v3_read_gva_memory(core, get_addr_linear(core, core->rip, &(core->segments.cs)), 15, instr); + } - //PrintDebug("PDE Index=%d\n", PDE32_INDEX(first_operand)); - //PrintDebug("FirstOperand = %x\n", first_operand); + if (ret == -1) { + PrintError(core->vm_info, core, "Could not read instruction into buffer\n"); + return -1; + } - if (shadow_pde_entry->large_page == 1) { - shadow_pde_entry->present = 0; - } else { - if (shadow_pde_entry->present == 1) { - pte32_t * shadow_pt = (pte32_t *)PDE32_T_ADDR((*shadow_pde_entry)); - pte32_t * shadow_pte_entry = (pte32_t *)&shadow_pt[PTE32_INDEX(first_operand)]; + if (v3_decode(core, (addr_t)instr, &dec_instr) == -1) { + PrintError(core->vm_info, core, "Decoding Error\n"); + return -1; + } + + if ((dec_instr.op_type != V3_OP_INVLPG) || + (dec_instr.num_operands != 1) || + (dec_instr.dst_operand.type != MEM_OPERAND)) { + PrintError(core->vm_info, core, "Decoder Error: Not a valid INVLPG instruction...\n"); + return -1; + } - shadow_pte_entry->present = 0; - } + vaddr = dec_instr.dst_operand.operand; + + core->rip += dec_instr.instr_length; + + { + struct v3_shdw_impl_state * state = &(core->vm_info->shdw_impl); + struct v3_shdw_pg_impl * impl = state->current_impl; + int rc; + + if (have_callbacks(core)) { + struct v3_shdw_pg_event event={SHADOW_INVLPG,SHADOW_PREIMPL,vaddr,{0,0,0,0,0,0}}; + dispatch_event(core,&event); } - info->rip += index; + rc=impl->handle_invlpg(core, vaddr); - } else { - PrintDebug("Invalid Operand type\n"); - return -1; - } - } else { - PrintDebug("invalid Instruction Opcode\n"); - PrintTraceMemDump(instr, 15); - return -1; - } - } + if (have_callbacks(core)) { + struct v3_shdw_pg_event event={SHADOW_INVLPG,SHADOW_POSTIMPL,vaddr,{0,0,0,0,0,0}}; + dispatch_event(core,&event); + } - return 0; + return rc; + } } -/* Deprecated */ -/* -addr_t setup_shadow_pt32(struct guest_info * info, addr_t virt_cr3) { - addr_t cr3_guest_addr = CR3_TO_PDE32(virt_cr3); - pde32_t * guest_pde; - pde32_t * host_pde = NULL; - int i; - - // Setup up guest_pde to point to the PageDir in host addr - if (guest_pa_to_host_va(info, cr3_guest_addr, (addr_t*)&guest_pde) == -1) { - return 0; - } - - V3_AllocPages(host_pde, 1); - memset(host_pde, 0, PAGE_SIZE); - for (i = 0; i < MAX_PDE32_ENTRIES; i++) { - if (guest_pde[i].present == 1) { - addr_t pt_host_addr; - addr_t host_pte; - if (guest_pa_to_host_va(info, PDE32_T_ADDR(guest_pde[i]), &pt_host_addr) == -1) { - return 0; - } - if ((host_pte = setup_shadow_pte32(info, pt_host_addr)) == 0) { - return 0; - } +int v3_inject_guest_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) { + core->ctrl_regs.cr2 = fault_addr; - host_pde[i].present = 1; - host_pde[i].pt_base_addr = PD32_BASE_ADDR(host_pte); +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY + core->shdw_pg_state.guest_faults++; +#endif - // - // Set Page DIR flags - // - } - } + return v3_raise_exception_with_error(core, PF_EXCEPTION, *(uint_t *)&error_code); +} - PrintDebugPageTables(host_pde); - return (addr_t)host_pde; -} +int v3_is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access) { + /* basically the reasoning is that there can be multiple reasons for a page fault: + If there is a permissions failure for a page present in the guest _BUT_ + the reason for the fault was that the page is not present in the shadow, + _THEN_ we have to map the shadow page in and reexecute, this will generate + a permissions fault which is _THEN_ valid to send to the guest + _UNLESS_ both the guest and shadow have marked the page as not present + whew... + */ + if (guest_access != PT_ACCESS_OK) { + // Guest Access Error + if ((shadow_access != PT_ACCESS_NOT_PRESENT) && + (guest_access != PT_ACCESS_NOT_PRESENT)) { + // aka (guest permission error) + return 1; + } -addr_t setup_shadow_pte32(struct guest_info * info, addr_t pt_host_addr) { - pte32_t * guest_pte = (pte32_t *)pt_host_addr; - pte32_t * host_pte = NULL; - int i; + /* + if ((shadow_access == PT_ACCESS_NOT_PRESENT) && + (guest_access == PT_ACCESS_NOT_PRESENT)) { + // Page tables completely blank, handle guest first + return 1; + } + */ - V3_AllocPages(host_pte, 1); - memset(host_pte, 0, PAGE_SIZE); + if (guest_access == PT_ACCESS_NOT_PRESENT) { + // Page tables completely blank, handle guest first + return 1; + } + + // Otherwise we'll handle the guest fault later...? + } - for (i = 0; i < MAX_PTE32_ENTRIES; i++) { - if (guest_pte[i].present == 1) { - addr_t guest_pa = PTE32_T_ADDR(guest_pte[i]); - shadow_mem_type_t page_type; - addr_t host_pa = 0; + return 0; +} - page_type = get_shadow_addr_type(info, guest_pa); - if (page_type == HOST_REGION_PHYSICAL_MEMORY) { - host_pa = get_shadow_addr(info, guest_pa); - } else { - - // - // Setup various memory types - // - } +int v3_register_shadow_paging_event_callback(struct v3_vm_info *vm, + int (*callback)(struct guest_info *core, + struct v3_shdw_pg_event *event, + void *priv_data), + void *priv_data) +{ + struct event_callback *ec = V3_Malloc(sizeof(struct event_callback)); + addr_t flags; - host_pte[i].page_base_addr = PT32_BASE_ADDR(host_pa); - host_pte[i].present = 1; + if (!ec) { + PrintError(vm, VCORE_NONE, "Unable to allocate for a shadow paging event callback\n"); + return -1; } - } + + ec->callback = callback; + ec->priv_data = priv_data; + + flags=v3_write_lock_irqsave(&(vm->shdw_impl.event_callback_lock)); + list_add(&(ec->node),&(vm->shdw_impl.event_callback_list)); + v3_write_unlock_irqrestore(&(vm->shdw_impl.event_callback_lock),flags); + + return 0; - return (addr_t)host_pte; } -*/ +int v3_unregister_shadow_paging_event_callback(struct v3_vm_info *vm, + int (*callback)(struct guest_info *core, + struct v3_shdw_pg_event *event, + void *priv_data), + void *priv_data) +{ + struct event_callback *cb,*temp; + addr_t flags; + + flags=v3_write_lock_irqsave(&(vm->shdw_impl.event_callback_lock)); + + list_for_each_entry_safe(cb, + temp, + &(vm->shdw_impl.event_callback_list), + node) { + if ((callback == cb->callback) && (priv_data == cb->priv_data)) { + list_del(&(cb->node)); + v3_write_unlock_irqrestore(&(vm->shdw_impl.event_callback_lock),flags); + V3_Free(cb); + return 0; + } + } + + v3_write_unlock_irqrestore(&(vm->shdw_impl.event_callback_lock),flags); + + PrintError(vm, VCORE_NONE, "No callback found!\n"); + + return -1; +} + +