近段时间在Vmware中使用 VT EPT技术时
测试发现性能正常 操作流畅 无卡顿 CPU占用降低
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EptData* g_EptData = 0;
// Builds EPT, allocates pre-allocated entires, initializes and returns EptData
_Use_decl_annotations_ EptData* EptInitialization() {
PAGED_CODE()
if (g_EptData != 0)//增加
return g_EptData;//增加
static const auto kEptPageWalkLevel = 4ul;
// Allocate ept_data
const auto ept_data = static_cast<EptData*>(ExAllocatePoolWithTag(
NonPagedPool, sizeof(EptData), kHyperPlatformCommonPoolTag));
if (!ept_data) {
return nullptr;
}
RtlZeroMemory(ept_data, sizeof(EptData));
//// Allocate EptPointer
//const auto ept_poiner = reinterpret_cast<EptPointer*>(ExAllocatePoolWithTag(
// NonPagedPool, PAGE_SIZE, kHyperPlatformCommonPoolTag));
//if (!ept_poiner) {
// ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
// return nullptr;
//}
//RtlZeroMemory(ept_poiner, PAGE_SIZE);
// Allocate EPT_PML4 and initialize EptPointer
const auto ept_pml4 = static_cast<EptCommonEntry*>(
ExAllocatePoolWithTag(NonPagedPool, PAGE_SIZE, kHyperPlatformCommonPoolTag));
if (!ept_pml4) {
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
RtlZeroMemory(ept_pml4, PAGE_SIZE);
ept_data->ept_pointer.all = 0;
ept_data->ept_pointer.fields.memory_type =
static_cast<ULONG64>(EptpGetMemoryType(UtilPaFromVa(ept_pml4)));
ept_data->ept_pointer.fields.page_walk_length = kEptPageWalkLevel - 1;
ept_data->ept_pointer.fields.pml4_address =
UtilPfnFromPa(UtilPaFromVa(ept_pml4));
// Initialize all EPT entries for all physical memory pages
const auto pm_ranges = UtilGetPhysicalMemoryRanges();
for (auto run_index = 0ul; run_index < pm_ranges->number_of_runs;
++run_index) {
const auto run = &pm_ranges->run[run_index];
const auto base_addr = run->base_page * PAGE_SIZE;
for (auto page_index = 0ull; page_index < run->page_count; ++page_index) {
const auto indexed_addr = base_addr + page_index * PAGE_SIZE;
const auto ept_pt_entry =
EptpConstructTables(ept_pml4, 4, indexed_addr, nullptr);
if (!ept_pt_entry) {
EptpDestructTables(ept_pml4, 4);
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
}
}
// Initialize an EPT entry for APIC_BASE. It is required to allocated it now
// for some reasons, or else, system hangs.
const Ia32ApicBaseMsr apic_msr = { UtilReadMsr64(Msr::kIa32ApicBase) };
if (!EptpConstructTables(ept_pml4, 4, apic_msr.fields.apic_base * PAGE_SIZE,
nullptr)) {
EptpDestructTables(ept_pml4, 4);
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
// Allocate preallocated_entries
const auto preallocated_entries_size =
sizeof(EptCommonEntry*) * kEptpNumberOfPreallocatedEntries;
const auto preallocated_entries = static_cast<EptCommonEntry**>(
ExAllocatePoolWithTag(NonPagedPool, preallocated_entries_size,
kHyperPlatformCommonPoolTag));
if (!preallocated_entries) {
EptpDestructTables(ept_pml4, 4);
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
RtlZeroMemory(preallocated_entries, preallocated_entries_size);
// And fill preallocated_entries with newly created entries
for (auto i = 0ul; i < kEptpNumberOfPreallocatedEntries; ++i) {
const auto ept_entry = EptpAllocateEptEntry(nullptr);
if (!ept_entry) {
EptpFreeUnusedPreAllocatedEntries(preallocated_entries, 0);
EptpDestructTables(ept_pml4, 4);
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
preallocated_entries[i] = ept_entry;
}
// Initialization completed
ept_data->ept_pml4 = ept_pml4;
ept_data->preallocated_entries = preallocated_entries;
ept_data->preallocated_entries_count = 0;
g_EptData = ept_data;//增加
return ept_data;
}
EptData* g_EptData = 0;
// Builds EPT, allocates pre-allocated entires, initializes and returns EptData
_Use_decl_annotations_ EptData* EptInitialization() {
PAGED_CODE()
if (g_EptData != 0)//增加
return g_EptData;//增加
static const auto kEptPageWalkLevel = 4ul;
// Allocate ept_data
const auto ept_data = static_cast<EptData*>(ExAllocatePoolWithTag(
NonPagedPool, sizeof(EptData), kHyperPlatformCommonPoolTag));
if (!ept_data) {
return nullptr;
}
RtlZeroMemory(ept_data, sizeof(EptData));
//// Allocate EptPointer
//const auto ept_poiner = reinterpret_cast<EptPointer*>(ExAllocatePoolWithTag(
// NonPagedPool, PAGE_SIZE, kHyperPlatformCommonPoolTag));
//if (!ept_poiner) {
// ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
// return nullptr;
//}
//RtlZeroMemory(ept_poiner, PAGE_SIZE);
// Allocate EPT_PML4 and initialize EptPointer
const auto ept_pml4 = static_cast<EptCommonEntry*>(
ExAllocatePoolWithTag(NonPagedPool, PAGE_SIZE, kHyperPlatformCommonPoolTag));
if (!ept_pml4) {
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
RtlZeroMemory(ept_pml4, PAGE_SIZE);
ept_data->ept_pointer.all = 0;
ept_data->ept_pointer.fields.memory_type =
static_cast<ULONG64>(EptpGetMemoryType(UtilPaFromVa(ept_pml4)));
ept_data->ept_pointer.fields.page_walk_length = kEptPageWalkLevel - 1;
ept_data->ept_pointer.fields.pml4_address =
UtilPfnFromPa(UtilPaFromVa(ept_pml4));
// Initialize all EPT entries for all physical memory pages
const auto pm_ranges = UtilGetPhysicalMemoryRanges();
for (auto run_index = 0ul; run_index < pm_ranges->number_of_runs;
++run_index) {
const auto run = &pm_ranges->run[run_index];
const auto base_addr = run->base_page * PAGE_SIZE;
for (auto page_index = 0ull; page_index < run->page_count; ++page_index) {
const auto indexed_addr = base_addr + page_index * PAGE_SIZE;
const auto ept_pt_entry =
EptpConstructTables(ept_pml4, 4, indexed_addr, nullptr);
if (!ept_pt_entry) {
EptpDestructTables(ept_pml4, 4);
ExFreePoolWithTag(ept_data, kHyperPlatformCommonPoolTag);
return nullptr;
}
}
}
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