X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_shadow_paging.c;h=9650f135cb0f528b44fd2bf35b405f22d430f93e;hb=8cd246c3830733c2850cef049a7ad153daf0dd13;hp=4f9d00f4a6bdb3b1203e587a2aa195cef609ebe9;hpb=14fa18cc54571eaa7aaa0f7d55677bdb4dad81a6;p=palacios.git diff --git a/palacios/src/palacios/vmm_shadow_paging.c b/palacios/src/palacios/vmm_shadow_paging.c index 4f9d00f..9650f13 100644 --- a/palacios/src/palacios/vmm_shadow_paging.c +++ b/palacios/src/palacios/vmm_shadow_paging.c @@ -33,23 +33,33 @@ -#ifdef CONFIG_SHADOW_PAGING_TELEMETRY +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY #include #endif -#ifdef CONFIG_SYMBIOTIC_SWAP +#ifdef V3_CONFIG_SYMBIOTIC_SWAP #include #endif -#ifndef CONFIG_DEBUG_SHADOW_PAGING +#ifndef V3_CONFIG_DEBUG_SHADOW_PAGING #undef PrintDebug #define PrintDebug(fmt, args...) #endif +static const char default_strategy[] = "VTLB"; + static struct hashtable * master_shdw_pg_table = NULL; + +struct event_callback { + int (*callback)(struct guest_info *core, struct v3_shdw_pg_event *event, void *priv_data); + void *priv_data; + + 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)); @@ -62,6 +72,30 @@ static int shdw_pg_eq_fn(addr_t key1, addr_t key2) { return (strcmp(name1, name2) == 0); } +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)); +} + +static void dispatch_event(struct guest_info *core, struct v3_shdw_pg_event *event) +{ + struct event_callback *cb,*temp; + + v3_read_lock(&(core->vm_info->shdw_impl.event_callback_lock)); + + list_for_each_entry_safe(cb, + temp, + &(core->vm_info->shdw_impl.event_callback_list), + node) { + cb->callback(core,event,cb->priv_data); + } + + v3_read_unlock(&(core->vm_info->shdw_impl.event_callback_lock)); +} + int V3_init_shdw_paging() { extern struct v3_shdw_pg_impl * __start__v3_shdw_pg_impls[]; @@ -73,17 +107,17 @@ int V3_init_shdw_paging() { while (tmp_impl != __stop__v3_shdw_pg_impls) { - V3_Print("Registering Shadow Paging Impl (%s)\n", (*tmp_impl)->name); + 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("Multiple instances of shadow paging impl (%s)\n", (*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("Could not register shadow paging impl (%s)\n", (*tmp_impl)->name); + PrintError(VM_NONE, VCORE_NONE, "Could not register shadow paging impl (%s)\n", (*tmp_impl)->name); return -1; } @@ -93,6 +127,11 @@ int V3_init_shdw_paging() { return 0; } +int V3_deinit_shdw_paging() { + v3_free_htable(master_shdw_pg_table, 0, 0); + return 0; +} + /*** @@ -100,13 +139,13 @@ int V3_init_shdw_paging() { ***/ -#ifdef CONFIG_SHADOW_PAGING_TELEMETRY +#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]); - V3_Print("%s Guest Page faults: %d\n", hdr, core->shdw_pg_state.guest_faults); + V3_Print(vm, core, "%s Guest Page faults: %d\n", hdr, core->shdw_pg_state.guest_faults); } } #endif @@ -122,17 +161,36 @@ int v3_init_shdw_pg_state(struct guest_info * core) { state->guest_cr0 = 0; state->guest_efer.value = 0x0LL; - if (impl->local_init(core) == -1) { - PrintError("Error in Shadow paging local initialization (%s)\n", impl->name); + PrintError(core->vm_info, core, "Error in Shadow paging local initialization (%s)\n", impl->name); return -1; } -#ifdef CONFIG_SHADOW_PAGING_TELEMETRY +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY v3_add_telemetry_cb(core->vm_info, telemetry_cb, NULL); #endif + + return 0; +} + + +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; + } + + return 0; } @@ -141,31 +199,94 @@ int v3_init_shdw_pg_state(struct guest_info * core) { 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 * impl_name = v3_cfg_val(pg_cfg, "mode"); + 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; - V3_Print("Initialization of Shadow Paging implementation\n"); + 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"; + } + } - impl = (struct v3_shdw_pg_impl *)v3_htable_search(master_shdw_pg_table, (addr_t)impl_name); + if (pg_strat == NULL) { + pg_strat = (char *)default_strategy; + } + + V3_Print(vm, VCORE_NONE,"Initialization of Shadow Paging implementation\n"); + + impl = (struct v3_shdw_pg_impl *)v3_htable_search(master_shdw_pg_table, (addr_t)pg_strat); if (impl == NULL) { - PrintError("Could not find shadow paging impl (%s)\n", impl_name); + 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("Could not initialize Shadow paging implemenation (%s)\n", impl->name); + 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; +} + // Reads the guest CR3 register // creates new shadow page tables @@ -173,7 +294,22 @@ int v3_init_shdw_impl(struct v3_vm_info * vm) { 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; - return impl->activate_shdw_pt(core); + + 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); + + rc =impl->activate_shdw_pt(core); + + dispatch_event(core,&event_post); + + return rc; + } } @@ -183,24 +319,54 @@ int v3_activate_shadow_pt(struct guest_info * core) { 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; - return impl->invalidate_shdw_pt(core); + + 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); + + rc = impl->invalidate_shdw_pt(core); + + 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 v3_handle_shadow_pagefault(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) +{ + int rc; + + + 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 - return v3_handle_passthrough_pagefault(core, fault_addr, error_code); + 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; - - return impl->handle_pagefault(core, fault_addr, error_code); + + rc = impl->handle_pagefault(core, fault_addr, error_code); } else { - PrintError("Invalid Memory mode\n"); - return -1; + 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); } + + return rc; } @@ -213,7 +379,7 @@ int v3_handle_shadow_invlpg(struct guest_info * core) { if (v3_get_vm_mem_mode(core) != 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"); + PrintError(core->vm_info, core, "ERROR: INVLPG called in non paged mode\n"); return -1; } @@ -224,19 +390,19 @@ int v3_handle_shadow_invlpg(struct guest_info * core) { } if (ret == -1) { - PrintError("Could not read instruction into buffer\n"); + PrintError(core->vm_info, core, "Could not read instruction into buffer\n"); return -1; } if (v3_decode(core, (addr_t)instr, &dec_instr) == -1) { - PrintError("Decoding Error\n"); + 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("Decoder Error: Not a valid INVLPG instruction...\n"); + PrintError(core->vm_info, core, "Decoder Error: Not a valid INVLPG instruction...\n"); return -1; } @@ -247,8 +413,21 @@ int v3_handle_shadow_invlpg(struct guest_info * core) { { 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); + } + + rc=impl->handle_invlpg(core, vaddr); + + 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 impl->handle_invlpg(core, vaddr); + return rc; } } @@ -260,7 +439,7 @@ int v3_handle_shadow_invlpg(struct guest_info * core) { int v3_inject_guest_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) { core->ctrl_regs.cr2 = fault_addr; -#ifdef CONFIG_SHADOW_PAGING_TELEMETRY +#ifdef V3_CONFIG_SHADOW_PAGING_TELEMETRY core->shdw_pg_state.guest_faults++; #endif @@ -307,3 +486,59 @@ int v3_is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_ac } +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; + + 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; + +} + +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; +} + +