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Kernel: Stop taking MM lock while using regular quickmaps

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You're still required to disable interrupts though, as the mappings are
per-CPU. This exposed the fact that our CR3 lookup map is insufficiently
protected (but we'll address that in a separate commit.)
This commit is contained in:
Andreas Kling
2022-08-22 15:23:32 +02:00
parent c8375c51ff
commit 6cd3695761
5 changed files with 15 additions and 14 deletions
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3
Kernel/Memory/AnonymousVMObject.cpp
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@@ -360,7 +360,6 @@ PageFaultResponse AnonymousVMObject::handle_cow_fault(size_t page_index, Virtual
dbgln_if(PAGE_FAULT_DEBUG, " >> COW {} <- {}", page->paddr(), page_slot->paddr());
{
SpinlockLocker mm_locker(s_mm_lock);
u8* dest_ptr = MM.quickmap_page(*page);
SmapDisabler disabler;
void* fault_at;