Devices/Graphics: Allow video acceleration disabling via CFGM bugref:10529

aleksey-ilyushin · aleksey-ilyushin · commit 671dccd63727 · 2026-07-16T15:46:04.000Z
svn:sync-xref-src-repo-rev: r174555
diff --git a/src/VBox/Devices/Graphics/DevVGA-SVGA.h b/src/VBox/Devices/Graphics/DevVGA-SVGA.h
@@ -1,4 +1,4 @@
-/* $Id: DevVGA-SVGA.h 114638 2026-07-07 17:03:05Z vitali.pelenjow@oracle.com $ */
+/* $Id: DevVGA-SVGA.h 114719 2026-07-16 15:46:04Z aleksey.ilyushin@oracle.com $ */
 /** @file
  * VMware SVGA device
  */
@@ -468,7 +468,7 @@ typedef struct VMSVGAState
     /** Whether MSAA support is enabled. */
     bool                        fVMSVGA3dMSAA;
     bool                        fVMSVGA2dGBO;
-    bool                        afPadding[1];
+    bool                        fVMSVGA3dVideoAcceleration;
     uint32_t                    uWidth;
     uint32_t                    uHeight;
     uint32_t                    uBpp;
diff --git a/src/VBox/Devices/Graphics/DevVGA-SVGA3d-dx-dx11.cpp b/src/VBox/Devices/Graphics/DevVGA-SVGA3d-dx-dx11.cpp
@@ -1,4 +1,4 @@
-/* $Id: DevVGA-SVGA3d-dx-dx11.cpp 114361 2026-06-15 14:47:34Z vitali.pelenjow@oracle.com $ */
+/* $Id: DevVGA-SVGA3d-dx-dx11.cpp 114719 2026-07-16 15:46:04Z aleksey.ilyushin@oracle.com $ */
 /** @file
  * DevVMWare - VMWare SVGA device
  */
@@ -439,6 +439,10 @@ typedef struct VMSVGA3DBACKEND
          * resources just in case. It works on AMD and Intel graphics without the workaround.
          */
         bool fAlwaysSetShaderResourceViewsForCompute : 1;
+
+        /* Do not create ID3D11VideoDevice.
+         */
+        bool fDisableVideoAcceleration : 1;
     } workarounds;
 } VMSVGA3DBACKEND;
 
@@ -1514,10 +1518,16 @@ static int dxDeviceCreate(PVMSVGA3DBACKEND pBackend, DXDEVICE *pDXDevice)
         }
 
         /* Failure to query VideoDevice should be ignored. */
-        hr2 = pDXDevice->pDevice->QueryInterface(__uuidof(ID3D11VideoDevice), (void**)&pDXDevice->pVideoDevice);
+        if (!pBackend->workarounds.fDisableVideoAcceleration)
+        {
+            hr2 = pDXDevice->pDevice->QueryInterface(__uuidof(ID3D11VideoDevice), (void**)&pDXDevice->pVideoDevice);
 #ifndef VBOX_WITH_DXMT /* DXMT has no video support, so failing is expected here. */
-        Assert(SUCCEEDED(hr2));
+            Assert(SUCCEEDED(hr2));
 #endif
+        }
+        else
+            hr2 = E_NOTIMPL;
+
         if (SUCCEEDED(hr2))
         {
             hr2 = pDXDevice->pImmediateContext->QueryInterface(__uuidof(ID3D11VideoContext), (void**)&pDXDevice->pVideoContext);
@@ -3407,6 +3417,8 @@ static DECLCALLBACK(int) vmsvga3dBackPowerOn(PPDMDEVINS pDevIns, PVGASTATE pThis
     PVMSVGA3DBACKEND pBackend = pState->pBackend;
     AssertReturn(pBackend, VERR_INVALID_STATE);
 
+    pBackend->workarounds.fDisableVideoAcceleration = !pThis->svga.fVMSVGA3dVideoAcceleration;
+
     int rc = dxDeviceCreate(pBackend, &pBackend->dxDevice);
     if (RT_SUCCESS(rc))
     {
diff --git a/src/VBox/Devices/Graphics/DevVGA.cpp b/src/VBox/Devices/Graphics/DevVGA.cpp
@@ -1,4 +1,4 @@
-/* $Id: DevVGA.cpp 114638 2026-07-07 17:03:05Z vitali.pelenjow@oracle.com $ */
+/* $Id: DevVGA.cpp 114719 2026-07-16 15:46:04Z aleksey.ilyushin@oracle.com $ */
 /** @file
  * DevVGA - VBox VGA/VESA device.
  */
@@ -6849,6 +6849,7 @@ static DECLCALLBACK(int)   vgaR3Construct(PPDMDEVINS pDevIns, int iInstance, PCF
                                             "|VMSVGA3dMSAA"
                                             "|VMSVGA2dGBO"
                                             "|VMSVGA3dGraphicsMemSizeGB"
+                                            "|VMSVGA3dVideoAcceleration"
 # endif
                                             "|SuppressNewYearSplash"
                                             "|3DEnabled";
@@ -6935,6 +6936,10 @@ static DECLCALLBACK(int)   vgaR3Construct(PPDMDEVINS pDevIns, int iInstance, PCF
     rc = pHlp->pfnCFGMQueryU64Def(pCfg, "VMSVGA3dGraphicsMemSizeGB", &u64VMSVGA3dGraphicsMemSizeGB, 4);
     AssertLogRelRCReturn(rc, rc);
     pThis->svga.cbGBObjectMemSize = RT_MIN(u64VMSVGA3dGraphicsMemSizeGB, 32) * _1G;
+
+    rc = pHlp->pfnCFGMQueryBoolDef(pCfg, "VMSVGA3dVideoAcceleration", &pThis->svga.fVMSVGA3dVideoAcceleration, true);
+    AssertLogRelRCReturn(rc, rc);
+    Log(("VMSVGA: VMSVGA3dVideoAcceleration = %d\n", pThis->svga.fVMSVGA3dVideoAcceleration));
 # endif
 
 # ifdef VBOX_WITH_VMSVGA
