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Ryujinx/Ryujinx.HLE/HOS/Kernel/Memory/KSharedMemory.cs
gdkchan 95017b8c66
Support memory aliasing (#2954)
* Back to the origins: Make memory manager take guest PA rather than host address once again

* Direct mapping with alias support on Windows

* Fixes and remove more of the emulated shared memory

* Linux support

* Make shared and transfer memory not depend on SharedMemoryStorage

* More efficient view mapping on Windows (no more restricted to 4KB pages at a time)

* Handle potential access violations caused by partial unmap

* Implement host mapping using shared memory on Linux

* Add new GetPhysicalAddressChecked method, used to ensure the virtual address is mapped before address translation

Also align GetRef behaviour with software memory manager

* We don't need a mirrorable memory block for software memory manager mode

* Disable memory aliasing tests while we don't have shared memory support on Mac

* Shared memory & SIGBUS handler for macOS

* Fix typo + nits + re-enable memory tests

* Set MAP_JIT_DARWIN on x86 Mac too

* Add back the address space mirror

* Only set MAP_JIT_DARWIN if we are mapping as executable

* Disable aliasing tests again (still fails on Mac)

* Fix UnmapView4KB (by not casting size to int)

* Use ref counting on memory blocks to delay closing the shared memory handle until all blocks using it are disposed

* Address PR feedback

* Make RO hold a reference to the guest process memory manager to avoid early disposal

Co-authored-by: nastys <nastys@users.noreply.github.com>
2022-05-02 20:30:02 -03:00

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C#

using Ryujinx.Common;
using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
namespace Ryujinx.HLE.HOS.Kernel.Memory
{
class KSharedMemory : KAutoObject
{
private readonly KPageList _pageList;
private readonly ulong _ownerPid;
private readonly KMemoryPermission _ownerPermission;
private readonly KMemoryPermission _userPermission;
public KSharedMemory(
KernelContext context,
SharedMemoryStorage storage,
ulong ownerPid,
KMemoryPermission ownerPermission,
KMemoryPermission userPermission) : base(context)
{
_pageList = storage.GetPageList();
_ownerPid = ownerPid;
_ownerPermission = ownerPermission;
_userPermission = userPermission;
}
public KernelResult MapIntoProcess(
KPageTableBase memoryManager,
ulong address,
ulong size,
KProcess process,
KMemoryPermission permission)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
KMemoryPermission expectedPermission = process.Pid == _ownerPid
? _ownerPermission
: _userPermission;
if (permission != expectedPermission)
{
return KernelResult.InvalidPermission;
}
return memoryManager.MapPages(address, _pageList, MemoryState.SharedMemory, permission);
}
public KernelResult UnmapFromProcess(KPageTableBase memoryManager, ulong address, ulong size, KProcess process)
{
if (_pageList.GetPagesCount() != BitUtils.DivRoundUp(size, KPageTableBase.PageSize))
{
return KernelResult.InvalidSize;
}
return memoryManager.UnmapPages(address, _pageList, MemoryState.SharedMemory);
}
}
}