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graphics: upload sparse PRT image backing

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This commit is contained in:
nmzik
2026-08-16 04:52:18 +02:00
parent 989477efad
commit 547b9b96cc
5 changed files with 147 additions and 4 deletions
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tests/VirtualMemoryAllocationTests.cpp
+79
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@@ -354,6 +354,84 @@ void TestGuestAddressSpaceOwnsReservationsBeforeBacking() {
std::printf("[host] %-48s ok\n", test);
}
void TestPrtBackingReadPreservesSparseResidency() {
const char* test = "PrtBackingReadPreservesSparseResidency";
constexpr uint64_t commit_size = SceKernelMemoryPoolCommitLen;
constexpr uint64_t aperture_len = commit_size * 3;
int64_t pool_offset = -1;
CheckOk(test,
Libs::LibKernel::Memory::KernelMemoryPoolExpand(
0, Libs::LibKernel::Memory::KernelGetDirectMemorySize(), commit_size * 2,
SceKernelMemoryPoolAlignment, &pool_offset),
"KernelMemoryPoolExpand");
void* arena = nullptr;
CheckOk(test,
Libs::LibKernel::Memory::KernelMemoryPoolReserve(
reinterpret_cast<void*>(0x1000000000ull), SceKernelMemoryPoolReserveLen, 0, 0,
&arena),
"KernelMemoryPoolReserve");
const auto base = reinterpret_cast<uint64_t>(arena);
CheckOk(test,
Libs::LibKernel::Memory::KernelMemoryPoolCommit(
arena, commit_size, SceKernelMtypeC, SceKernelProtCpuRw, 0),
"KernelMemoryPoolCommit(first)");
CheckOk(test,
Libs::LibKernel::Memory::KernelMemoryPoolCommit(
reinterpret_cast<void*>(base + commit_size * 2), commit_size, SceKernelMtypeC,
SceKernelProtCpuRw, 0),
"KernelMemoryPoolCommit(third)");
std::memset(reinterpret_cast<void*>(base), 0x3c, commit_size);
std::memset(reinterpret_cast<void*>(base + commit_size * 2), 0xa7, commit_size);
CheckOk(test, Libs::LibKernel::Memory::KernelSetPrtAperture(2, arena, aperture_len),
"KernelSetPrtAperture");
std::vector<uint8_t> bytes(aperture_len, 0x5a);
Check(test, !Libs::LibKernel::Memory::TryReadBacking(base, bytes.data(), bytes.size()),
"dense backing read accepted a nonresident span");
Check(test, std::all_of(bytes.begin(), bytes.end(), [](uint8_t value) { return value == 0x5a; }),
"failed dense backing read modified its destination");
Check(test, Libs::LibKernel::Memory::TryReadPrtBacking(base, bytes.data(), bytes.size()),
"PRT backing read rejected a valid sparse aperture range");
Check(test,
std::all_of(bytes.begin(), bytes.begin() + commit_size,
[](uint8_t value) { return value == 0x3c; }) &&
std::all_of(bytes.begin() + commit_size, bytes.begin() + commit_size * 2,
[](uint8_t value) { return value == 0; }) &&
std::all_of(bytes.begin() + commit_size * 2, bytes.end(),
[](uint8_t value) { return value == 0xa7; }),
"PRT backing read did not copy resident pages and zero nonresident pages");
Check(test,
!Libs::LibKernel::Memory::TryReadPrtBacking(base + commit_size * 2, bytes.data(),
commit_size * 2),
"PRT backing read crossed the registered aperture");
constexpr uint64_t unowned_prt = 0x5000000000ull;
CheckOk(test,
Libs::LibKernel::Memory::KernelSetPrtAperture(
2, reinterpret_cast<void*>(unowned_prt), commit_size),
"KernelSetPrtAperture(unowned)");
Check(test,
!Libs::LibKernel::Memory::TryReadPrtBacking(unowned_prt, bytes.data(), commit_size),
"PRT backing read accepted an unowned virtual range");
CheckOk(test, Libs::LibKernel::Memory::KernelSetPrtAperture(2, nullptr, 0),
"KernelSetPrtAperture(clear)");
CheckOk(test, Libs::LibKernel::Memory::KernelMemoryPoolDecommit(arena, commit_size, 0),
"KernelMemoryPoolDecommit(first)");
CheckOk(test,
Libs::LibKernel::Memory::KernelMemoryPoolDecommit(
reinterpret_cast<void*>(base + commit_size * 2), commit_size, 0),
"KernelMemoryPoolDecommit(third)");
CheckOk(test, Libs::LibKernel::Memory::KernelMunmap(base, SceKernelMemoryPoolReserveLen),
"KernelMunmap(pool reserve)");
CheckOk(test,
Libs::LibKernel::Memory::KernelReleaseDirectMemory(pool_offset, commit_size * 2),
"KernelReleaseDirectMemory(pool expansion)");
std::printf("[host] %-48s ok\n", test);
}
void TestGuestAddressSpaceHasNoFixedFallback() {
const char* test = "GuestAddressSpaceHasNoFixedFallback";
const auto unowned_address = reinterpret_cast<void*>(0x10000);
@@ -2440,6 +2518,7 @@ int main(int argc, char** argv) {
RunTest(TestWindowsGuestRedZoneStaticPatcher);
RunTest(TestProsperoArgumentAndInfoSizeContracts);
RunTest(TestGuestAddressSpaceOwnsReservationsBeforeBacking);
RunTest(TestPrtBackingReadPreservesSparseResidency);
RunTest(TestGuestAddressSpaceHasNoFixedFallback);
RunTest(TestGuestFreeRangeSearchDoesNotUnderflow);
RunTest(TestFlexibleMemoryCapacityIsBootFixed);