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Code Issues Releases Activity

kern: update ChangePermissions to use new iteration logic

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This commit is contained in:
Michael Scire 2024-10-10 14:20:31 -07:00 committed by SciresM
parent d2656e3948
commit e1e84d4450
2 changed files with 19 additions and 53 deletions
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1
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table.hpp
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@ -245,7 +245,6 @@ namespace ams::kern::arch::arm64 {
static ALWAYS_INLINE void ClearPageTable(KVirtualAddress table) {
cpu::ClearPageToZero(GetVoidPointer(table));
cpu::DataSynchronizationBarrierInnerShareable();
}
ALWAYS_INLINE void OnTableUpdated() const {

65
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
View file

@ -293,6 +293,10 @@ namespace ams::kern::arch::arm64 {
switch (operation) {
case OperationType_Map:
/* If mapping io or uncached pages, ensure that there is no pending reschedule. */
if (properties.io || properties.uncached) {
KScopedSchedulerLock sl;
}
R_RETURN(this->MapContiguous(virt_addr, phys_addr, num_pages, entry_template, properties.disable_merge_attributes == DisableMergeAttribute_DisableHead, page_list, reuse_ll));
case OperationType_ChangePermissions:
R_RETURN(this->ChangePermissions(virt_addr, num_pages, entry_template, properties.disable_merge_attributes, false, false, page_list, reuse_ll));
@ -317,6 +321,10 @@ namespace ams::kern::arch::arm64 {
switch (operation) {
case OperationType_MapGroup:
case OperationType_MapFirstGroup:
/* If mapping io or uncached pages, ensure that there is no pending reschedule. */
if (properties.io || properties.uncached) {
KScopedSchedulerLock sl;
}
R_RETURN(this->MapGroup(virt_addr, page_group, num_pages, entry_template, properties.disable_merge_attributes == DisableMergeAttribute_DisableHead, operation != OperationType_MapFirstGroup, page_list, reuse_ll));
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
@ -900,6 +908,9 @@ namespace ams::kern::arch::arm64 {
Result KPageTable::ChangePermissions(KProcessAddress virt_addr, size_t num_pages, PageTableEntry entry_template, DisableMergeAttribute disable_merge_attr, bool refresh_mapping, bool flush_mapping, PageLinkedList *page_list, bool reuse_ll) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
/* Ensure there are no pending data writes. */
cpu::DataSynchronizationBarrier();
/* Separate pages before we change permissions. */
R_TRY(this->SeparatePages(virt_addr, num_pages, page_list, reuse_ll));
@ -990,60 +1001,16 @@ namespace ams::kern::arch::arm64 {
}
/* Apply the entry template. */
L1PageTableEntry *l1_entry = impl.GetL1Entry(cur_virt_addr);
switch (next_entry.block_size) {
case L1BlockSize:
{
/* Write the updated entry. */
*l1_entry = L1PageTableEntry(PageTableEntry::BlockTag{}, next_entry.phys_addr, entry_template, sw_reserved_bits, false);
}
break;
case L2ContiguousBlockSize:
case L2BlockSize:
{
/* Get the number of L2 blocks. */
const size_t num_l2_blocks = next_entry.block_size / L2BlockSize;
const size_t num_entries = context.is_contiguous ? BlocksPerContiguousBlock : 1;
/* Get the L2 entry. */
KPhysicalAddress l2_phys = Null<KPhysicalAddress>;
MESOSPHERE_ABORT_UNLESS(l1_entry->GetTable(l2_phys));
const KVirtualAddress l2_virt = GetPageTableVirtualAddress(l2_phys);
/* Write the updated entry. */
const bool contig = next_entry.block_size == L2ContiguousBlockSize;
for (size_t i = 0; i < num_l2_blocks; i++) {
*impl.GetL2EntryFromTable(l2_virt, cur_virt_addr + L2BlockSize * i) = L2PageTableEntry(PageTableEntry::BlockTag{}, next_entry.phys_addr + L2BlockSize * i, entry_template, sw_reserved_bits, contig);
auto * const pte = context.level_entries[context.level];
const size_t block_size = impl.GetBlockSize(context.level);
for (size_t i = 0; i < num_entries; ++i) {
pte[i] = PageTableEntry(PageTableEntry::BlockTag{}, next_entry.phys_addr + i * block_size, entry_template, sw_reserved_bits, context.is_contiguous, context.level == KPageTableImpl::EntryLevel_L3);
sw_reserved_bits &= ~(PageTableEntry::SoftwareReservedBit_DisableMergeHead);
}
}
break;
case L3ContiguousBlockSize:
case L3BlockSize:
{
/* Get the number of L3 blocks. */
const size_t num_l3_blocks = next_entry.block_size / L3BlockSize;
/* Get the L2 entry. */
KPhysicalAddress l2_phys = Null<KPhysicalAddress>;
MESOSPHERE_ABORT_UNLESS(l1_entry->GetTable(l2_phys));
const KVirtualAddress l2_virt = GetPageTableVirtualAddress(l2_phys);
L2PageTableEntry *l2_entry = impl.GetL2EntryFromTable(l2_virt, cur_virt_addr);
/* Get the L3 entry. */
KPhysicalAddress l3_phys = Null<KPhysicalAddress>;
MESOSPHERE_ABORT_UNLESS(l2_entry->GetTable(l3_phys));
const KVirtualAddress l3_virt = GetPageTableVirtualAddress(l3_phys);
/* Write the updated entry. */
const bool contig = next_entry.block_size == L3ContiguousBlockSize;
for (size_t i = 0; i < num_l3_blocks; i++) {
*impl.GetL3EntryFromTable(l3_virt, cur_virt_addr + L3BlockSize * i) = L3PageTableEntry(PageTableEntry::BlockTag{}, next_entry.phys_addr + L3BlockSize * i, entry_template, sw_reserved_bits, contig);
sw_reserved_bits &= ~(PageTableEntry::SoftwareReservedBit_DisableMergeHead);
}
}
break;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
/* If our option asks us to, try to merge mappings. */
bool merge = ((apply_option & ApplyOption_MergeMappings) != 0 || cleared_disable_merge_bits) && next_entry.block_size < L1BlockSize;