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Force all exclusive memory accesses to be ordered on AppleHv (#5898)

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* Implement reprotect method on virtual memory manager (currently stubbed)

* Force all exclusive memory accesses to be ordered on AppleHv

* Format whitespace

* Fix test build

* Fix comment copy/paste

* Fix wrong bit for isLoad

* Update src/Ryujinx.Cpu/AppleHv/HvMemoryManager.cs

Co-authored-by: riperiperi <rhy3756547@hotmail.com>

---------

Co-authored-by: riperiperi <rhy3756547@hotmail.com>
This commit is contained in:
gdkchan 2023-11-07 13:24:10 -03:00 • committed by GitHub
parent 623604c391
commit 815819767c
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11 changed files with 171 additions and 59 deletions
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33
src/Ryujinx.Cpu/AppleHv/HvMemoryManager.cs
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@ -128,21 +128,6 @@ namespace Ryujinx.Cpu.AppleHv
}
}
#pragma warning disable IDE0051 // Remove unused private member
/// <summary>
/// Ensures the combination of virtual address and size is part of the addressable space and fully mapped.
/// </summary>
/// <param name="va">Virtual address of the range</param>
/// <param name="size">Size of the range in bytes</param>
private void AssertMapped(ulong va, ulong size)
{
if (!ValidateAddressAndSize(va, size) || !IsRangeMappedImpl(va, size))
{
throw new InvalidMemoryRegionException($"Not mapped: va=0x{va:X16}, size=0x{size:X16}");
}
}
#pragma warning restore IDE0051
/// <inheritdoc/>
public void Map(ulong va, ulong pa, ulong size, MemoryMapFlags flags)
{
@ -736,6 +721,24 @@ namespace Ryujinx.Cpu.AppleHv
return (int)(vaSpan / PageSize);
}
/// <inheritdoc/>
public void Reprotect(ulong va, ulong size, MemoryPermission protection)
{
if (protection.HasFlag(MemoryPermission.Execute))
{
// Some applications use unordered exclusive memory access instructions
// where it is not valid to do so, leading to memory re-ordering that
// makes the code behave incorrectly on some CPUs.
// To work around this, we force all such accesses to be ordered.
using WritableRegion writableRegion = GetWritableRegion(va, (int)size);
HvCodePatcher.RewriteUnorderedExclusiveInstructions(writableRegion.Memory.Span);
}
// TODO
}
/// <inheritdoc/>
public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
{