From 50b102dff88d96f433f8dfe586dabaf122270e87 Mon Sep 17 00:00:00 2001
From: Brad Werth <bwerth@mozilla.com>
Date: Fri, 16 Jun 2023 20:45:22 +0000
Subject: [PATCH] Bug 1815481: Disable hardware WebRender on Mesa drivers in
 Virtual Machines. r=rmader

We classify anything with 'mesa/vmgfx' as a Virtual Machine driver and
block it for Linux.

Differential Revision: https://phabricator.services.mozilla.com/D179864
---
 widget/GfxDriverInfo.cpp |  1 +
 widget/GfxDriverInfo.h   |  2 ++
 widget/gtk/GfxInfo.cpp   | 12 ++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/widget/GfxDriverInfo.cpp b/widget/GfxDriverInfo.cpp
index d9565f6a39f2..d0afb0dca531 100644
--- a/widget/GfxDriverInfo.cpp
+++ b/widget/GfxDriverInfo.cpp
@@ -773,6 +773,7 @@ const nsAString& GfxDriverInfo::GetDriverVendor(DriverVendor id) {
     DECLARE_DRIVER_VENDOR_ID(SoftwareMesaAll, "mesa/sw-all");
     DECLARE_DRIVER_VENDOR_ID(MesaNonIntelNvidiaAtiAll,
                              "mesa/non-intel-nvidia-ati-all");
+    DECLARE_DRIVER_VENDOR_ID(MesaVM, "mesa/vmwgfx");
     case DriverVendor::Max:  // Suppress a warning.
       DECLARE_DRIVER_VENDOR_ID(All, "");
   }
diff --git a/widget/GfxDriverInfo.h b/widget/GfxDriverInfo.h
index de5df9c0a5d2..404b23b60989 100644
--- a/widget/GfxDriverInfo.h
+++ b/widget/GfxDriverInfo.h
@@ -243,6 +243,8 @@ enum DriverVendor : uint8_t {
   SoftwareMesaAll,
   // Wildcard for all non-Intel/NVIDIA/ATI Mesa drivers.
   MesaNonIntelNvidiaAtiAll,
+  // Running in VM.
+  MesaVM,
 
   Max
 };
diff --git a/widget/gtk/GfxInfo.cpp b/widget/gtk/GfxInfo.cpp
index 1a338d418c83..61275d2a7a66 100644
--- a/widget/gtk/GfxInfo.cpp
+++ b/widget/gtk/GfxInfo.cpp
@@ -377,6 +377,10 @@ void GfxInfo::GetData() {
       CopyUTF16toUTF8(GfxDriverInfo::GetDriverVendor(DriverVendor::MesaSWRast),
                       mDriverVendor);
       mIsAccelerated = false;
+    } else if (strcasestr(driDriver.get(), "vmwgfx")) {
+      CopyUTF16toUTF8(GfxDriverInfo::GetDriverVendor(DriverVendor::MesaVM),
+                      mDriverVendor);
+      mIsAccelerated = false;
     } else if (!mIsAccelerated) {
       CopyUTF16toUTF8(
           GfxDriverInfo::GetDriverVendor(DriverVendor::MesaSWUnknown),
@@ -958,6 +962,14 @@ const nsTArray<GfxDriverInfo>& GfxInfo::GetGfxDriverInfo() {
         V(21, 0, 0, 0), "FEATURE_FAILURE_WEBRENDER_BUG_1635186",
         "Mesa 21.0.0.0");
 
+    // Bug 1815481 - Disable mesa drivers in virtual machines.
+    APPEND_TO_DRIVER_BLOCKLIST_EXT(
+        OperatingSystem::Linux, ScreenSizeStatus::All, BatteryStatus::All,
+        WindowProtocol::All, DriverVendor::MesaVM, DeviceFamily::All,
+        nsIGfxInfo::FEATURE_WEBRENDER, nsIGfxInfo::FEATURE_BLOCKED_DEVICE,
+        DRIVER_COMPARISON_IGNORED, V(0, 0, 0, 0),
+        "FEATURE_FAILURE_WEBRENDER_MESA_VM", "");
+
     ////////////////////////////////////
     // FEATURE_WEBRENDER_COMPOSITOR
     APPEND_TO_DRIVER_BLOCKLIST(