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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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62
src/Ryujinx.Cpu/AppleHv/HvCodePatcher.cs Normal file
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@ -0,0 +1,62 @@
using System;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;
namespace Ryujinx.Cpu.AppleHv
{
static class HvCodePatcher
{
private const uint XMask = 0x3f808000u;
private const uint XValue = 0x8000000u;
private const uint ZrIndex = 31u;
public static void RewriteUnorderedExclusiveInstructions(Span<byte> code)
{
Span<uint> codeUint = MemoryMarshal.Cast<byte, uint>(code);
Span<Vector128<uint>> codeVector = MemoryMarshal.Cast<byte, Vector128<uint>>(code);
Vector128<uint> mask = Vector128.Create(XMask);
Vector128<uint> value = Vector128.Create(XValue);
for (int index = 0; index < codeVector.Length; index++)
{
Vector128<uint> v = codeVector[index];
if (Vector128.EqualsAny(Vector128.BitwiseAnd(v, mask), value))
{
int baseIndex = index * 4;
for (int instIndex = baseIndex; instIndex < baseIndex + 4; instIndex++)
{
ref uint inst = ref codeUint[instIndex];
if ((inst & XMask) != XValue)
{
continue;
}
bool isPair = (inst & (1u << 21)) != 0;
bool isLoad = (inst & (1u << 22)) != 0;
uint rt2 = (inst >> 10) & 0x1fu;
uint rs = (inst >> 16) & 0x1fu;
if (isLoad && rs != ZrIndex)
{
continue;
}
if (!isPair && rt2 != ZrIndex)
{
continue;
}
// Set the ordered flag.
inst |= 1u << 15;
}
}
}
}
}
}

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)
{

23
src/Ryujinx.Cpu/Jit/MemoryManager.cs
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@ -575,24 +575,17 @@ namespace Ryujinx.Cpu.Jit
}
}
#pragma warning disable IDE0051 // Remove unused private member
private ulong GetPhysicalAddress(ulong va)
{
// We return -1L if the virtual address is invalid or unmapped.
if (!ValidateAddress(va) || !IsMapped(va))
{
return ulong.MaxValue;
}
return GetPhysicalAddressInternal(va);
}
#pragma warning restore IDE0051
private ulong GetPhysicalAddressInternal(ulong va)
{
return PteToPa(_pageTable.Read<ulong>((va / PageSize) * PteSize) & ~(0xffffUL << 48)) + (va & PageMask);
}
/// <inheritdoc/>
public void Reprotect(ulong va, ulong size, MemoryPermission protection)
{
// TODO
}
/// <inheritdoc/>
public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
{
@ -698,9 +691,5 @@ namespace Ryujinx.Cpu.Jit
/// Disposes of resources used by the memory manager.
/// </summary>
protected override void Destroy() => _pageTable.Dispose();
#pragma warning disable IDE0051 // Remove unused private member
private static void ThrowInvalidMemoryRegionException(string message) => throw new InvalidMemoryRegionException(message);
#pragma warning restore IDE0051
}
}

6
src/Ryujinx.Cpu/Jit/MemoryManagerHostMapped.cs
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@ -615,6 +615,12 @@ namespace Ryujinx.Cpu.Jit
return (int)(vaSpan / PageSize);
}
/// <inheritdoc/>
public void Reprotect(ulong va, ulong size, MemoryPermission protection)
{
// TODO
}
/// <inheritdoc/>
public void TrackingReprotect(ulong va, ulong size, MemoryPermission protection)
{