From 45b0886bc4df0533c796f7fe06e089884cb11f88 Mon Sep 17 00:00:00 2001
From: John Falkowski <john.falkowski@intel.com>
Date: Wed, 19 Nov 2025 19:28:06 +0000
Subject: [PATCH] fix: Disable shared system USM for TBX mode

Related-To: NEO-16531

Signed-off-by: John Falkowski <john.falkowski@intel.com>
---
 shared/source/os_interface/device_factory.cpp |  1 +
 .../os_interface/device_factory_tests.cpp     | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/shared/source/os_interface/device_factory.cpp b/shared/source/os_interface/device_factory.cpp
index 54deec7261..d49dd15e8b 100644
--- a/shared/source/os_interface/device_factory.cpp
+++ b/shared/source/os_interface/device_factory.cpp
@@ -131,6 +131,7 @@ bool DeviceFactory::prepareDeviceEnvironmentsForProductFamilyOverride(ExecutionE
                     if (!productHelper.setupHardwareInfo(*hardwareInfo, *capsReader)) {
                         return false;
                     }
+                    hardwareInfo->capabilityTable.sharedSystemMemCapabilities = 0;
                 }
             }
         }
diff --git a/shared/test/unit_test/os_interface/device_factory_tests.cpp b/shared/test/unit_test/os_interface/device_factory_tests.cpp
index a4671f7918..8ecb9663b8 100644
--- a/shared/test/unit_test/os_interface/device_factory_tests.cpp
+++ b/shared/test/unit_test/os_interface/device_factory_tests.cpp
@@ -321,6 +321,27 @@ TEST_F(DeviceFactoryOverrideTest, givenFailedProductHelperSetupHardwareInfoWhenP
     EXPECT_EQ(1u, productHelper->setupHardwareInfoCalled);
 }
 
+TEST_F(DeviceFactoryOverrideTest, givenTbxModeWhenPreparingDeviceEnvironmentsForProductFamilyOverrideThenSharedSystemMemCapabilitiesCleard) {
+    DebugManagerStateRestore stateRestore;
+    debugManager.flags.SetCommandStreamReceiver.set(static_cast<int>(CommandStreamReceiverType::tbx));
+
+    struct MyMockProductHelper : MockProductHelper {
+        std::unique_ptr<DeviceCapsReader> getDeviceCapsReader(aub_stream::AubManager &aubManager) const override {
+            std::vector<uint32_t> caps;
+            return std::make_unique<DeviceCapsReaderMock>(caps);
+        }
+    };
+
+    auto productHelper = new MyMockProductHelper();
+    productHelper->setupHardwareInfoResult = true;
+
+    executionEnvironment.rootDeviceEnvironments[0]->productHelper.reset(productHelper);
+
+    auto rc = DeviceFactory::prepareDeviceEnvironmentsForProductFamilyOverride(executionEnvironment);
+    EXPECT_EQ(true, rc);
+    EXPECT_EQ(0u, executionEnvironment.rootDeviceEnvironments[0]->getHardwareInfo()->capabilityTable.sharedSystemMemCapabilities);
+}
+
 TEST_F(DeviceFactoryOverrideTest, givenDefaultHwInfoWhenPrepareDeviceEnvironmentsForProductFamilyOverrideIsCalledThenSlmSizeInKbEqualsMaxProgrammableSlmSize) {
     DebugManagerStateRestore restore;
     bool success = DeviceFactory::prepareDeviceEnvironmentsForProductFamilyOverride(executionEnvironment);