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memory: write GPU publishes to backed pages and skip reserved holes like sparse reads

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This commit is contained in:
nmzik
2026-10-20 15:53:23 +02:00
parent f492027be2
commit 6ad393775f
2 changed files with 63 additions and 56 deletions
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tests/VirtualMemoryAllocationTests.cpp
+12 -9
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@@ -1596,20 +1596,23 @@ void TestDirectMapQueryOffsetAndPartialMunmap() {
ExpectUnmapped(test, base + SceKernelPageSize);
constexpr uint64_t transaction_sentinel = 0x5452414e53414354ull; // "TRANSACT"
constexpr uint64_t rejected_write = 0x4e4f504152544941ull; // "NOPARTIA"
constexpr uint64_t sparse_write = 0x4e4f504152544941ull; // "NOPARTIA"
constexpr uint64_t backed_prefix_mask = 0xffffffffull;
const auto crossing_address = base + SceKernelPageSize - sizeof(uint32_t);
std::memcpy(reinterpret_cast<void*>(alias_base + SceKernelPageSize - sizeof(uint32_t)),
&transaction_sentinel, sizeof(transaction_sentinel));
Check(test,
!Libs::LibKernel::Memory::TryWriteBacking(crossing_address, &rejected_write,
sizeof(rejected_write)),
"TryWriteBacking should reject a range crossing an unmapped span");
uint64_t backing_after_rejected_write = 0;
std::memcpy(&backing_after_rejected_write,
Libs::LibKernel::Memory::TryWriteBacking(crossing_address, &sparse_write,
sizeof(sparse_write)),
"TryWriteBacking should write a range crossing an unmapped span");
uint64_t backing_after_sparse_write = 0;
std::memcpy(&backing_after_sparse_write,
reinterpret_cast<const void*>(alias_base + SceKernelPageSize - sizeof(uint32_t)),
sizeof(backing_after_rejected_write));
Check(test, backing_after_rejected_write == transaction_sentinel,
"failed backing writes must not modify a validated prefix");
sizeof(backing_after_sparse_write));
Check(test,
backing_after_sparse_write == ((sparse_write & backed_prefix_mask) |
(transaction_sentinel & ~backed_prefix_mask)),
"sparse backing writes must fill the backed prefix and skip the unmapped span");
uint64_t rejected_read = transaction_sentinel;
Check(test,
!Libs::LibKernel::Memory::TryReadBacking(crossing_address, &rejected_read,