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Separate guest/host tracking + unaligned protection (#6486)

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* WIP: Separate guest/host tracking + unaligned protection

Allow memory manager to define support for single byte guest tracking

* Formatting

* Improve docs

* Properly handle cases where the address space bits are too low

* Address feedback
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riperiperi 2024-03-14 22:38:27 +00:00 • committed by GitHub
parent ce607db944
commit fdd3263e31
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18 changed files with 774 additions and 763 deletions
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137
src/Ryujinx.Memory/Tracking/MemoryTracking.cs
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@ -14,9 +14,14 @@ namespace Ryujinx.Memory.Tracking
// Only use these from within the lock.
private readonly NonOverlappingRangeList<VirtualRegion> _virtualRegions;
// Guest virtual regions are a subset of the normal virtual regions, with potentially different protection
// and expanded area of effect on platforms that don't support misaligned page protection.
private readonly NonOverlappingRangeList<VirtualRegion> _guestVirtualRegions;
private readonly int _pageSize;
private readonly bool _singleByteGuestTracking;
/// <summary>
/// This lock must be obtained when traversing or updating the region-handle hierarchy.
/// It is not required when reading dirty flags.
@ -27,16 +32,27 @@ namespace Ryujinx.Memory.Tracking
/// Create a new tracking structure for the given "physical" memory block,
/// with a given "virtual" memory manager that will provide mappings and virtual memory protection.
/// </summary>
/// <remarks>
/// If <paramref name="singleByteGuestTracking" /> is true, the memory manager must also support protection on partially
/// unmapped regions without throwing exceptions or dropping protection on the mapped portion.
/// </remarks>
/// <param name="memoryManager">Virtual memory manager</param>
/// <param name="block">Physical memory block</param>
/// <param name="pageSize">Page size of the virtual memory space</param>
public MemoryTracking(IVirtualMemoryManager memoryManager, int pageSize, InvalidAccessHandler invalidAccessHandler = null)
/// <param name="invalidAccessHandler">Method to call for invalid memory accesses</param>
/// <param name="singleByteGuestTracking">True if the guest only signals writes for the first byte</param>
public MemoryTracking(
IVirtualMemoryManager memoryManager,
int pageSize,
InvalidAccessHandler invalidAccessHandler = null,
bool singleByteGuestTracking = false)
{
_memoryManager = memoryManager;
_pageSize = pageSize;
_invalidAccessHandler = invalidAccessHandler;
_singleByteGuestTracking = singleByteGuestTracking;
_virtualRegions = new NonOverlappingRangeList<VirtualRegion>();
_guestVirtualRegions = new NonOverlappingRangeList<VirtualRegion>();
}
private (ulong address, ulong size) PageAlign(ulong address, ulong size)
@ -62,20 +78,25 @@ namespace Ryujinx.Memory.Tracking
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
for (int type = 0; type < 2; type++)
{
VirtualRegion region = overlaps[i];
NonOverlappingRangeList<VirtualRegion> regions = type == 0 ? _virtualRegions : _guestVirtualRegions;
// If the region has been fully remapped, signal that it has been mapped again.
bool remapped = _memoryManager.IsRangeMapped(region.Address, region.Size);
if (remapped)
int count = regions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
{
region.SignalMappingChanged(true);
}
VirtualRegion region = overlaps[i];
region.UpdateProtection();
// If the region has been fully remapped, signal that it has been mapped again.
bool remapped = _memoryManager.IsRangeMapped(region.Address, region.Size);
if (remapped)
{
region.SignalMappingChanged(true);
}
region.UpdateProtection();
}
}
}
}
@ -95,27 +116,58 @@ namespace Ryujinx.Memory.Tracking
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
for (int type = 0; type < 2; type++)
{
VirtualRegion region = overlaps[i];
NonOverlappingRangeList<VirtualRegion> regions = type == 0 ? _virtualRegions : _guestVirtualRegions;
region.SignalMappingChanged(false);
int count = regions.FindOverlapsNonOverlapping(va, size, ref overlaps);
for (int i = 0; i < count; i++)
{
VirtualRegion region = overlaps[i];
region.SignalMappingChanged(false);
}
}
}
}
/// <summary>
/// Alter a tracked memory region to properly capture unaligned accesses.
/// For most memory manager modes, this does nothing.
/// </summary>
/// <param name="address">Original region address</param>
/// <param name="size">Original region size</param>
/// <returns>A new address and size for tracking unaligned accesses</returns>
internal (ulong newAddress, ulong newSize) GetUnalignedSafeRegion(ulong address, ulong size)
{
if (_singleByteGuestTracking)
{
// The guest only signals the first byte of each memory access with the current memory manager.
// To catch unaligned access properly, we need to also protect the page before the address.
// Assume that the address and size are already aligned.
return (address - (ulong)_pageSize, size + (ulong)_pageSize);
}
else
{
return (address, size);
}
}
/// <summary>
/// Get a list of virtual regions that a handle covers.
/// </summary>
/// <param name="va">Starting virtual memory address of the handle</param>
/// <param name="size">Size of the handle's memory region</param>
/// <param name="guest">True if getting handles for guest protection, false otherwise</param>
/// <returns>A list of virtual regions within the given range</returns>
internal List<VirtualRegion> GetVirtualRegionsForHandle(ulong va, ulong size)
internal List<VirtualRegion> GetVirtualRegionsForHandle(ulong va, ulong size, bool guest)
{
List<VirtualRegion> result = new();
_virtualRegions.GetOrAddRegions(result, va, size, (va, size) => new VirtualRegion(this, va, size));
NonOverlappingRangeList<VirtualRegion> regions = guest ? _guestVirtualRegions : _virtualRegions;
regions.GetOrAddRegions(result, va, size, (va, size) => new VirtualRegion(this, va, size, guest));
return result;
}
@ -126,7 +178,14 @@ namespace Ryujinx.Memory.Tracking
/// <param name="region">Region to remove</param>
internal void RemoveVirtual(VirtualRegion region)
{
_virtualRegions.Remove(region);
if (region.Guest)
{
_guestVirtualRegions.Remove(region);
}
else
{
_virtualRegions.Remove(region);
}
}
/// <summary>
@ -137,10 +196,11 @@ namespace Ryujinx.Memory.Tracking
/// <param name="handles">Handles to inherit state from or reuse. When none are present, provide null</param>
/// <param name="granularity">Desired granularity of write tracking</param>
/// <param name="id">Handle ID</param>
/// <param name="flags">Region flags</param>
/// <returns>The memory tracking handle</returns>
public MultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity, int id)
public MultiRegionHandle BeginGranularTracking(ulong address, ulong size, IEnumerable<IRegionHandle> handles, ulong granularity, int id, RegionFlags flags = RegionFlags.None)
{
return new MultiRegionHandle(this, address, size, handles, granularity, id);
return new MultiRegionHandle(this, address, size, handles, granularity, id, flags);
}
/// <summary>
@ -164,15 +224,16 @@ namespace Ryujinx.Memory.Tracking
/// <param name="address">CPU virtual address of the region</param>
/// <param name="size">Size of the region</param>
/// <param name="id">Handle ID</param>
/// <param name="flags">Region flags</param>
/// <returns>The memory tracking handle</returns>
public RegionHandle BeginTracking(ulong address, ulong size, int id)
public RegionHandle BeginTracking(ulong address, ulong size, int id, RegionFlags flags = RegionFlags.None)
{
var (paAddress, paSize) = PageAlign(address, size);
lock (TrackingLock)
{
bool mapped = _memoryManager.IsRangeMapped(address, size);
RegionHandle handle = new(this, paAddress, paSize, address, size, id, mapped);
RegionHandle handle = new(this, paAddress, paSize, address, size, id, flags, mapped);
return handle;
}
@ -186,15 +247,16 @@ namespace Ryujinx.Memory.Tracking
/// <param name="bitmap">The bitmap owning the dirty flag for this handle</param>
/// <param name="bit">The bit of this handle within the dirty flag</param>
/// <param name="id">Handle ID</param>
/// <param name="flags">Region flags</param>
/// <returns>The memory tracking handle</returns>
internal RegionHandle BeginTrackingBitmap(ulong address, ulong size, ConcurrentBitmap bitmap, int bit, int id)
internal RegionHandle BeginTrackingBitmap(ulong address, ulong size, ConcurrentBitmap bitmap, int bit, int id, RegionFlags flags = RegionFlags.None)
{
var (paAddress, paSize) = PageAlign(address, size);
lock (TrackingLock)
{
bool mapped = _memoryManager.IsRangeMapped(address, size);
RegionHandle handle = new(this, paAddress, paSize, address, size, bitmap, bit, id, mapped);
RegionHandle handle = new(this, paAddress, paSize, address, size, bitmap, bit, id, flags, mapped);
return handle;
}
@ -202,6 +264,7 @@ namespace Ryujinx.Memory.Tracking
/// <summary>
/// Signal that a virtual memory event happened at the given location.
/// The memory event is assumed to be triggered by guest code.
/// </summary>
/// <param name="address">Virtual address accessed</param>
/// <param name="size">Size of the region affected in bytes</param>
@ -209,7 +272,7 @@ namespace Ryujinx.Memory.Tracking
/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
public bool VirtualMemoryEvent(ulong address, ulong size, bool write)
{
return VirtualMemoryEvent(address, size, write, precise: false, null);
return VirtualMemoryEvent(address, size, write, precise: false, exemptId: null, guest: true);
}
/// <summary>
@ -222,8 +285,9 @@ namespace Ryujinx.Memory.Tracking
/// <param name="write">Whether the region was written to or read</param>
/// <param name="precise">True if the access is precise, false otherwise</param>
/// <param name="exemptId">Optional ID that of the handles that should not be signalled</param>
/// <param name="guest">True if the access is from the guest, false otherwise</param>
/// <returns>True if the event triggered any tracking regions, false otherwise</returns>
public bool VirtualMemoryEvent(ulong address, ulong size, bool write, bool precise, int? exemptId = null)
public bool VirtualMemoryEvent(ulong address, ulong size, bool write, bool precise, int? exemptId = null, bool guest = false)
{
// Look up the virtual region using the region list.
// Signal up the chain to relevant handles.
@ -234,7 +298,9 @@ namespace Ryujinx.Memory.Tracking
{
ref var overlaps = ref ThreadStaticArray<VirtualRegion>.Get();
int count = _virtualRegions.FindOverlapsNonOverlapping(address, size, ref overlaps);
NonOverlappingRangeList<VirtualRegion> regions = guest ? _guestVirtualRegions : _virtualRegions;
int count = regions.FindOverlapsNonOverlapping(address, size, ref overlaps);
if (count == 0 && !precise)
{
@ -242,7 +308,7 @@ namespace Ryujinx.Memory.Tracking
{
// TODO: There is currently the possibility that a page can be protected after its virtual region is removed.
// This code handles that case when it happens, but it would be better to find out how this happens.
_memoryManager.TrackingReprotect(address & ~(ulong)(_pageSize - 1), (ulong)_pageSize, MemoryPermission.ReadAndWrite);
_memoryManager.TrackingReprotect(address & ~(ulong)(_pageSize - 1), (ulong)_pageSize, MemoryPermission.ReadAndWrite, guest);
return true; // This memory _should_ be mapped, so we need to try again.
}
else
@ -252,6 +318,12 @@ namespace Ryujinx.Memory.Tracking
}
else
{
if (guest && _singleByteGuestTracking)
{
// Increase the access size to trigger handles with misaligned accesses.
size += (ulong)_pageSize;
}
for (int i = 0; i < count; i++)
{
VirtualRegion region = overlaps[i];
@ -285,9 +357,10 @@ namespace Ryujinx.Memory.Tracking
/// </summary>
/// <param name="region">Region to reprotect</param>
/// <param name="permission">Memory permission to protect with</param>
internal void ProtectVirtualRegion(VirtualRegion region, MemoryPermission permission)
/// <param name="guest">True if the protection is for guest access, false otherwise</param>
internal void ProtectVirtualRegion(VirtualRegion region, MemoryPermission permission, bool guest)
{
_memoryManager.TrackingReprotect(region.Address, region.Size, permission);
_memoryManager.TrackingReprotect(region.Address, region.Size, permission, guest);
}
/// <summary>