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kern: use new merge pages api

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This commit is contained in:
Michael Scire 2024-10-10 13:39:08 -07:00
parent e2f068548b
commit 170688ef30
2 changed files with 15 additions and 203 deletions
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4
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table.hpp
View file

@ -231,9 +231,7 @@ namespace ams::kern::arch::arm64 {
Result MapContiguous(KProcessAddress virt_addr, KPhysicalAddress phys_addr, size_t num_pages, PageTableEntry entry_template, bool disable_head_merge, PageLinkedList *page_list, bool reuse_ll);
Result MapGroup(KProcessAddress virt_addr, const KPageGroup &pg, size_t num_pages, PageTableEntry entry_template, bool disable_head_merge, bool not_first, PageLinkedList *page_list, bool reuse_ll);
bool MergePages(KProcessAddress virt_addr, PageLinkedList *page_list);
void MergePages(TraversalContext *context, PageLinkedList *page_list);
bool MergePages(TraversalContext *context, PageLinkedList *page_list);
void MergePages(KProcessAddress virt_addr, size_t num_pages, PageLinkedList *page_list);
Result SeparatePagesImpl(TraversalEntry *entry, TraversalContext *context, KProcessAddress virt_addr, size_t block_size, PageLinkedList *page_list, bool reuse_ll);

214
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
View file

@ -678,13 +678,7 @@ namespace ams::kern::arch::arm64 {
}
/* Perform what coalescing we can. */
this->MergePages(orig_virt_addr, page_list);
if (num_pages > 1) {
this->MergePages(orig_virt_addr + (num_pages - 1) * PageSize, page_list);
}
/* Wait for pending stores to complete. */
cpu::DataSynchronizationBarrierInnerShareableStore();
this->MergePages(orig_virt_addr, num_pages, page_list);
/* Open references to the pages, if we should. */
if (IsHeapPhysicalAddress(orig_phys_addr)) {
@ -776,207 +770,20 @@ namespace ams::kern::arch::arm64 {
MESOSPHERE_ASSERT(mapped_pages == num_pages);
/* Perform what coalescing we can. */
this->MergePages(orig_virt_addr, page_list);
if (num_pages > 1) {
this->MergePages(orig_virt_addr + (num_pages - 1) * PageSize, page_list);
}
/* Wait for pending stores to complete. */
cpu::DataSynchronizationBarrierInnerShareableStore();
this->MergePages(orig_virt_addr, num_pages, page_list);
/* We succeeded! We want to persist the reference to the pages. */
spg.CancelClose();
R_SUCCEED();
}
bool KPageTable::MergePages(KProcessAddress virt_addr, PageLinkedList *page_list) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
auto &impl = this->GetImpl();
bool merged = false;
/* If there's no L1 table, don't bother. */
L1PageTableEntry *l1_entry = impl.GetL1Entry(virt_addr);
if (!l1_entry->IsTable()) {
/* Ensure the table is not corrupted. */
MESOSPHERE_ABORT_UNLESS(l1_entry->IsBlock() || l1_entry->IsEmpty());
return merged;
}
/* Examine and try to merge the L2 table. */
L2PageTableEntry *l2_entry = impl.GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsTable()) {
/* We have an L3 entry. */
L3PageTableEntry *l3_entry = impl.GetL3Entry(l2_entry, virt_addr);
if (!l3_entry->IsBlock()) {
return merged;
}
/* If it's not contiguous, try to make it so. */
if (!l3_entry->IsContiguous()) {
virt_addr = util::AlignDown(GetInteger(virt_addr), L3ContiguousBlockSize);
const KPhysicalAddress phys_addr = util::AlignDown(GetInteger(l3_entry->GetBlock()), L3ContiguousBlockSize);
const u64 entry_template = l3_entry->GetEntryTemplateForMerge();
/* Validate that we can merge. */
for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) {
const L3PageTableEntry *check_entry = impl.GetL3Entry(l2_entry, virt_addr + L3BlockSize * i);
if (!check_entry->IsForMerge(entry_template | GetInteger(phys_addr + L3BlockSize * i) | PageTableEntry::Type_L3Block)) {
return merged;
}
if (i > 0 && (check_entry->IsHeadOrHeadAndBodyMergeDisabled())) {
return merged;
}
if ((i < (L3ContiguousBlockSize / L3BlockSize) - 1) && check_entry->IsTailMergeDisabled()) {
return merged;
}
}
/* Determine the new software reserved bits. */
const L3PageTableEntry *head_entry = impl.GetL3Entry(l2_entry, virt_addr + L3BlockSize * 0);
const L3PageTableEntry *tail_entry = impl.GetL3Entry(l2_entry, virt_addr + L3BlockSize * ((L3ContiguousBlockSize / L3BlockSize) - 1));
auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_entry->IsHeadMergeDisabled(), head_entry->IsHeadAndBodyMergeDisabled(), tail_entry->IsTailMergeDisabled());
/* Merge! */
for (size_t i = 0; i < L3ContiguousBlockSize / L3BlockSize; i++) {
*impl.GetL3Entry(l2_entry, virt_addr + L3BlockSize * i) = L3PageTableEntry(PageTableEntry::BlockTag{}, phys_addr + L3BlockSize * i, PageTableEntry(entry_template), sw_reserved_bits, true);
sw_reserved_bits &= ~(PageTableEntry::SoftwareReservedBit_DisableMergeHead);
}
/* Note that we updated. */
this->NoteUpdated();
merged = true;
}
/* We might be able to upgrade a contiguous set of L3 entries into an L2 block. */
virt_addr = util::AlignDown(GetInteger(virt_addr), L2BlockSize);
KPhysicalAddress phys_addr = util::AlignDown(GetInteger(l3_entry->GetBlock()), L2BlockSize);
const u64 entry_template = l3_entry->GetEntryTemplateForMerge();
/* Validate that we can merge. */
for (size_t i = 0; i < L2BlockSize / L3ContiguousBlockSize; i++) {
const L3PageTableEntry *check_entry = impl.GetL3Entry(l2_entry, virt_addr + L3ContiguousBlockSize * i);
if (!check_entry->IsForMerge(entry_template | GetInteger(phys_addr + L3ContiguousBlockSize * i) | PageTableEntry::ContigType_Contiguous | PageTableEntry::Type_L3Block)) {
return merged;
}
if (i > 0 && (check_entry->IsHeadOrHeadAndBodyMergeDisabled())) {
return merged;
}
if ((i < (L2BlockSize / L3ContiguousBlockSize) - 1) && check_entry->IsTailMergeDisabled()) {
return merged;
}
}
/* Determine the new software reserved bits. */
const L3PageTableEntry *head_entry = impl.GetL3Entry(l2_entry, virt_addr + L3ContiguousBlockSize * 0);
const L3PageTableEntry *tail_entry = impl.GetL3Entry(l2_entry, virt_addr + L3ContiguousBlockSize * ((L2BlockSize / L3ContiguousBlockSize) - 1));
auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_entry->IsHeadMergeDisabled(), head_entry->IsHeadAndBodyMergeDisabled(), tail_entry->IsTailMergeDisabled());
/* Merge! */
*l2_entry = L2PageTableEntry(PageTableEntry::BlockTag{}, phys_addr, PageTableEntry(entry_template), sw_reserved_bits, false);
/* Note that we updated. */
this->NoteUpdated();
merged = true;
/* Free the L3 table. */
KVirtualAddress l3_table = util::AlignDown(reinterpret_cast<uintptr_t>(l3_entry), PageSize);
if (this->GetPageTableManager().IsInPageTableHeap(l3_table)) {
this->GetPageTableManager().Close(l3_table, L2BlockSize / L3BlockSize);
ClearPageTable(l3_table);
this->FreePageTable(page_list, l3_table);
}
}
/* If the l2 entry is not a block or we can't make it contiguous, we're done. */
if (!l2_entry->IsBlock()) {
return merged;
}
/* If it's not contiguous, try to make it so. */
if (!l2_entry->IsContiguous()) {
virt_addr = util::AlignDown(GetInteger(virt_addr), L2ContiguousBlockSize);
KPhysicalAddress phys_addr = util::AlignDown(GetInteger(l2_entry->GetBlock()), L2ContiguousBlockSize);
const u64 entry_template = l2_entry->GetEntryTemplateForMerge();
/* Validate that we can merge. */
for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) {
const L2PageTableEntry *check_entry = impl.GetL2Entry(l1_entry, virt_addr + L2BlockSize * i);
if (!check_entry->IsForMerge(entry_template | GetInteger(phys_addr + L2BlockSize * i) | PageTableEntry::Type_L2Block)) {
return merged;
}
if (i > 0 && (check_entry->IsHeadOrHeadAndBodyMergeDisabled())) {
return merged;
}
if ((i < (L2ContiguousBlockSize / L2BlockSize) - 1) && check_entry->IsTailMergeDisabled()) {
return merged;
}
}
/* Determine the new software reserved bits. */
const L2PageTableEntry *head_entry = impl.GetL2Entry(l1_entry, virt_addr + L2BlockSize * 0);
const L2PageTableEntry *tail_entry = impl.GetL2Entry(l1_entry, virt_addr + L2BlockSize * ((L2ContiguousBlockSize / L2BlockSize) - 1));
auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_entry->IsHeadMergeDisabled(), head_entry->IsHeadAndBodyMergeDisabled(), tail_entry->IsTailMergeDisabled());
/* Merge! */
for (size_t i = 0; i < L2ContiguousBlockSize / L2BlockSize; i++) {
*impl.GetL2Entry(l1_entry, virt_addr + L2BlockSize * i) = L2PageTableEntry(PageTableEntry::BlockTag{}, phys_addr + L2BlockSize * i, PageTableEntry(entry_template), sw_reserved_bits, true);
sw_reserved_bits &= ~(PageTableEntry::SoftwareReservedBit_DisableMergeHead);
}
/* Note that we updated. */
this->NoteUpdated();
merged = true;
}
/* We might be able to upgrade a contiguous set of L2 entries into an L1 block. */
virt_addr = util::AlignDown(GetInteger(virt_addr), L1BlockSize);
KPhysicalAddress phys_addr = util::AlignDown(GetInteger(l2_entry->GetBlock()), L1BlockSize);
const u64 entry_template = l2_entry->GetEntryTemplateForMerge();
/* Validate that we can merge. */
for (size_t i = 0; i < L1BlockSize / L2ContiguousBlockSize; i++) {
const L2PageTableEntry *check_entry = impl.GetL2Entry(l1_entry, virt_addr + L2ContiguousBlockSize * i);
if (!check_entry->IsForMerge(entry_template | GetInteger(phys_addr + L2ContiguousBlockSize * i) | PageTableEntry::ContigType_Contiguous | PageTableEntry::Type_L2Block)) {
return merged;
}
if (i > 0 && (check_entry->IsHeadOrHeadAndBodyMergeDisabled())) {
return merged;
}
if ((i < (L1ContiguousBlockSize / L2ContiguousBlockSize) - 1) && check_entry->IsTailMergeDisabled()) {
return merged;
}
}
/* Determine the new software reserved bits. */
const L2PageTableEntry *head_entry = impl.GetL2Entry(l1_entry, virt_addr + L2ContiguousBlockSize * 0);
const L2PageTableEntry *tail_entry = impl.GetL2Entry(l1_entry, virt_addr + L2ContiguousBlockSize * ((L1BlockSize / L2ContiguousBlockSize) - 1));
auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_entry->IsHeadMergeDisabled(), head_entry->IsHeadAndBodyMergeDisabled(), tail_entry->IsTailMergeDisabled());
/* Merge! */
*l1_entry = L1PageTableEntry(PageTableEntry::BlockTag{}, phys_addr, PageTableEntry(entry_template), sw_reserved_bits, false);
/* Note that we updated. */
this->NoteUpdated();
merged = true;
/* Free the L2 table. */
KVirtualAddress l2_table = util::AlignDown(reinterpret_cast<uintptr_t>(l2_entry), PageSize);
if (this->GetPageTableManager().IsInPageTableHeap(l2_table)) {
this->GetPageTableManager().Close(l2_table, L1BlockSize / L2BlockSize);
ClearPageTable(l2_table);
this->FreePageTable(page_list, l2_table);
}
return merged;
}
void KPageTable::MergePages(TraversalContext *context, PageLinkedList *page_list) {
bool KPageTable::MergePages(TraversalContext *context, PageLinkedList *page_list) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
auto &impl = this->GetImpl();
/* Iteratively merge, until we can't. */
bool merged = false;
while (true) {
/* Try to merge. */
KVirtualAddress freed_table = Null<KVirtualAddress>;
@ -988,9 +795,16 @@ namespace ams::kern::arch::arm64 {
this->NoteUpdated();
/* Free the page. */
ClearPageTable(freed_table);
this->FreePageTable(page_list, freed_table);
if (freed_table != Null<KVirtualAddress>) {
ClearPageTable(freed_table);
this->FreePageTable(page_list, freed_table);
}
/* We performed at least one merge. */
merged = true;
}
return merged;
}
void KPageTable::MergePages(KProcessAddress virt_addr, size_t num_pages, PageLinkedList *page_list) {
@ -1231,7 +1045,7 @@ namespace ams::kern::arch::arm64 {
if (util::IsAligned(GetInteger(cur_virt_addr) + next_entry.block_size, larger_align)) {
const uintptr_t aligned_start = util::AlignDown(GetInteger(cur_virt_addr), larger_align);
if (orig_virt_addr <= aligned_start && aligned_start + larger_align - 1 < GetInteger(orig_virt_addr) + (num_pages * PageSize) - 1) {
merge = this->MergePages(cur_virt_addr, page_list);
merge = this->MergePages(std::addressof(context), page_list);
} else {
merge = false;
}