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Kernel: Factor address space management out of the Process class

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This patch adds Space, a class representing a process's address space.

- Each Process has a Space.
- The Space owns the PageDirectory and all Regions in the Process.

This allows us to reorganize sys$execve() so that it constructs and
populates a new Space fully before committing to it.

Previously, we would construct the new address space while still
running in the old one, and encountering an error meant we had to do
tedious and error-prone rollback.

Those problems are now gone, replaced by what's hopefully a set of much
smaller problems and missing cleanups. :^)
This commit is contained in:
Andreas Kling 2021-02-08 15:45:40 +01:00
parent b2cba3036e
commit f1b5def8fd
27 changed files with 494 additions and 404 deletions
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21
Kernel/VM/PageDirectory.h
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@ -40,10 +40,10 @@ class PageDirectory : public RefCounted<PageDirectory> {
friend class MemoryManager;
public:
static RefPtr<PageDirectory> create_for_userspace(Process& process, const RangeAllocator* parent_range_allocator = nullptr)
static RefPtr<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr)
{
auto page_directory = adopt(*new PageDirectory(process, parent_range_allocator));
if (!page_directory->process())
auto page_directory = adopt(*new PageDirectory(parent_range_allocator));
if (!page_directory->is_valid())
return {};
return page_directory;
}
@ -55,24 +55,31 @@ public:
u32 cr3() const { return m_directory_table->paddr().get(); }
RangeAllocator& range_allocator() { return m_range_allocator; }
const RangeAllocator& range_allocator() const { return m_range_allocator; }
RangeAllocator& identity_range_allocator() { return m_identity_range_allocator; }
Process* process() { return m_process; }
const Process* process() const { return m_process; }
bool is_valid() const { return m_valid; }
Space* space() { return m_space; }
const Space* space() const { return m_space; }
void set_space(Badge<Space>, Space& space) { m_space = &space; }
RecursiveSpinLock& get_lock() { return m_lock; }
private:
PageDirectory(Process&, const RangeAllocator* parent_range_allocator);
explicit PageDirectory(const RangeAllocator* parent_range_allocator);
PageDirectory();
Process* m_process { nullptr };
Space* m_space { nullptr };
RangeAllocator m_range_allocator;
RangeAllocator m_identity_range_allocator;
RefPtr<PhysicalPage> m_directory_table;
RefPtr<PhysicalPage> m_directory_pages[4];
HashMap<u32, RefPtr<PhysicalPage>> m_page_tables;
RecursiveSpinLock m_lock;
bool m_valid { false };
};
}