diff --git a/libs/hwui/Properties.cpp b/libs/hwui/Properties.cpp
index ba44d05..65f4e8c 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -15,7 +15,9 @@
  */
 
 #include "Properties.h"
+
 #include "Debug.h"
+#include "log/log_main.h"
 #ifdef __ANDROID__
 #include "HWUIProperties.sysprop.h"
 #endif
@@ -190,15 +192,12 @@
     return sRenderPipelineType;
 }
 
-void Properties::overrideRenderPipelineType(RenderPipelineType type) {
+void Properties::overrideRenderPipelineType(RenderPipelineType type, bool inUnitTest) {
     // If we're doing actual rendering then we can't change the renderer after it's been set.
-    // Unit tests can freely change this as often as it wants, though, as there's no actual
-    // GL rendering happening
-    if (sRenderPipelineType != RenderPipelineType::NotInitialized) {
-        LOG_ALWAYS_FATAL_IF(sRenderPipelineType != type,
-                "Trying to change pipeline but it's already set");
-        return;
-    }
+    // Unit tests can freely change this as often as it wants.
+    LOG_ALWAYS_FATAL_IF(sRenderPipelineType != RenderPipelineType::NotInitialized &&
+                                sRenderPipelineType != type && !inUnitTest,
+                        "Trying to change pipeline but it's already set.");
     sRenderPipelineType = type;
 }
 
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index 85a0f4a..1639143 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -238,7 +238,7 @@
     static bool enableRTAnimations;
 
     // Used for testing only to change the render pipeline.
-    static void overrideRenderPipelineType(RenderPipelineType);
+    static void overrideRenderPipelineType(RenderPipelineType, bool inUnitTest = false);
 
     static bool runningInEmulator;
 
diff --git a/libs/hwui/renderthread/VulkanManager.cpp b/libs/hwui/renderthread/VulkanManager.cpp
index 1333b92..3e7ce36 100644
--- a/libs/hwui/renderthread/VulkanManager.cpp
+++ b/libs/hwui/renderthread/VulkanManager.cpp
@@ -27,6 +27,8 @@
 #include <vk/GrVkExtensions.h>
 #include <vk/GrVkTypes.h>
 
+#include <cstring>
+
 #include "Properties.h"
 #include "RenderThread.h"
 #include "renderstate/RenderState.h"
@@ -53,6 +55,19 @@
     }
 }
 
+GrVkGetProc VulkanManager::sSkiaGetProp = [](const char* proc_name, VkInstance instance,
+                                             VkDevice device) {
+    if (device != VK_NULL_HANDLE) {
+        if (strcmp("vkQueueSubmit", proc_name) == 0) {
+            return (PFN_vkVoidFunction)VulkanManager::interceptedVkQueueSubmit;
+        } else if (strcmp("vkQueueWaitIdle", proc_name) == 0) {
+            return (PFN_vkVoidFunction)VulkanManager::interceptedVkQueueWaitIdle;
+        }
+        return vkGetDeviceProcAddr(device, proc_name);
+    }
+    return vkGetInstanceProcAddr(instance, proc_name);
+};
+
 #define GET_PROC(F) m##F = (PFN_vk##F)vkGetInstanceProcAddr(VK_NULL_HANDLE, "vk" #F)
 #define GET_INST_PROC(F) m##F = (PFN_vk##F)vkGetInstanceProcAddr(mInstance, "vk" #F)
 #define GET_DEV_PROC(F) m##F = (PFN_vk##F)vkGetDeviceProcAddr(mDevice, "vk" #F)
@@ -83,7 +98,6 @@
     }
 
     mGraphicsQueue = VK_NULL_HANDLE;
-    mAHBUploadQueue = VK_NULL_HANDLE;
     mDevice = VK_NULL_HANDLE;
     mPhysicalDevice = VK_NULL_HANDLE;
     mInstance = VK_NULL_HANDLE;
@@ -185,7 +199,6 @@
     for (uint32_t i = 0; i < queueCount; i++) {
         if (queueProps[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
             mGraphicsQueueIndex = i;
-            LOG_ALWAYS_FATAL_IF(queueProps[i].queueCount < 2);
             break;
         }
     }
@@ -210,14 +223,7 @@
         LOG_ALWAYS_FATAL_IF(!hasKHRSwapchainExtension);
     }
 
-    auto getProc = [](const char* proc_name, VkInstance instance, VkDevice device) {
-        if (device != VK_NULL_HANDLE) {
-            return vkGetDeviceProcAddr(device, proc_name);
-        }
-        return vkGetInstanceProcAddr(instance, proc_name);
-    };
-
-    grExtensions.init(getProc, mInstance, mPhysicalDevice, mInstanceExtensions.size(),
+    grExtensions.init(sSkiaGetProp, mInstance, mPhysicalDevice, mInstanceExtensions.size(),
                       mInstanceExtensions.data(), mDeviceExtensions.size(),
                       mDeviceExtensions.data());
 
@@ -289,7 +295,7 @@
             queueNextPtr,                                // pNext
             0,                                           // VkDeviceQueueCreateFlags
             mGraphicsQueueIndex,                         // queueFamilyIndex
-            2,                                           // queueCount
+            1,                                           // queueCount
             queuePriorities,                             // pQueuePriorities
     };
 
@@ -344,7 +350,6 @@
     this->setupDevice(mExtensions, mPhysicalDeviceFeatures2);
 
     mGetDeviceQueue(mDevice, mGraphicsQueueIndex, 0, &mGraphicsQueue);
-    mGetDeviceQueue(mDevice, mGraphicsQueueIndex, 1, &mAHBUploadQueue);
 
     if (Properties::enablePartialUpdates && Properties::useBufferAge) {
         mSwapBehavior = SwapBehavior::BufferAge;
@@ -353,24 +358,17 @@
 
 sk_sp<GrDirectContext> VulkanManager::createContext(const GrContextOptions& options,
                                                     ContextType contextType) {
-    auto getProc = [](const char* proc_name, VkInstance instance, VkDevice device) {
-        if (device != VK_NULL_HANDLE) {
-            return vkGetDeviceProcAddr(device, proc_name);
-        }
-        return vkGetInstanceProcAddr(instance, proc_name);
-    };
 
     GrVkBackendContext backendContext;
     backendContext.fInstance = mInstance;
     backendContext.fPhysicalDevice = mPhysicalDevice;
     backendContext.fDevice = mDevice;
-    backendContext.fQueue = (contextType == ContextType::kRenderThread) ? mGraphicsQueue
-                                                                        : mAHBUploadQueue;
+    backendContext.fQueue = mGraphicsQueue;
     backendContext.fGraphicsQueueIndex = mGraphicsQueueIndex;
     backendContext.fMaxAPIVersion = mAPIVersion;
     backendContext.fVkExtensions = &mExtensions;
     backendContext.fDeviceFeatures2 = &mPhysicalDeviceFeatures2;
-    backendContext.fGetProc = std::move(getProc);
+    backendContext.fGetProc = sSkiaGetProp;
 
     return GrDirectContext::MakeVulkan(backendContext, options);
 }
@@ -530,6 +528,8 @@
         ALOGE_IF(VK_SUCCESS != err, "VulkanManager::swapBuffers(): Failed to get semaphore Fd");
     } else {
         ALOGE("VulkanManager::swapBuffers(): Semaphore submission failed");
+
+        std::lock_guard<std::mutex> lock(mGraphicsQueueMutex);
         mQueueWaitIdle(mGraphicsQueue);
     }
     destroy_semaphore(destroyInfo);
@@ -540,6 +540,7 @@
 void VulkanManager::destroySurface(VulkanSurface* surface) {
     // Make sure all submit commands have finished before starting to destroy objects.
     if (VK_NULL_HANDLE != mGraphicsQueue) {
+        std::lock_guard<std::mutex> lock(mGraphicsQueueMutex);
         mQueueWaitIdle(mGraphicsQueue);
     }
     mDeviceWaitIdle(mDevice);
diff --git a/libs/hwui/renderthread/VulkanManager.h b/libs/hwui/renderthread/VulkanManager.h
index 7a77466..121afc9 100644
--- a/libs/hwui/renderthread/VulkanManager.h
+++ b/libs/hwui/renderthread/VulkanManager.h
@@ -17,6 +17,10 @@
 #ifndef VULKANMANAGER_H
 #define VULKANMANAGER_H
 
+#include <functional>
+#include <mutex>
+
+#include "vulkan/vulkan_core.h"
 #if !defined(VK_USE_PLATFORM_ANDROID_KHR)
 #define VK_USE_PLATFORM_ANDROID_KHR
 #endif
@@ -161,8 +165,25 @@
     VkDevice mDevice = VK_NULL_HANDLE;
 
     uint32_t mGraphicsQueueIndex;
+
+    std::mutex mGraphicsQueueMutex;
     VkQueue mGraphicsQueue = VK_NULL_HANDLE;
-    VkQueue mAHBUploadQueue = VK_NULL_HANDLE;
+
+    static VKAPI_ATTR VkResult interceptedVkQueueSubmit(VkQueue queue, uint32_t submitCount,
+                                                        const VkSubmitInfo* pSubmits,
+                                                        VkFence fence) {
+        sp<VulkanManager> manager = VulkanManager::getInstance();
+        std::lock_guard<std::mutex> lock(manager->mGraphicsQueueMutex);
+        return manager->mQueueSubmit(queue, submitCount, pSubmits, fence);
+    }
+
+    static VKAPI_ATTR VkResult interceptedVkQueueWaitIdle(VkQueue queue) {
+        sp<VulkanManager> manager = VulkanManager::getInstance();
+        std::lock_guard<std::mutex> lock(manager->mGraphicsQueueMutex);
+        return manager->mQueueWaitIdle(queue);
+    }
+
+    static GrVkGetProc sSkiaGetProp;
 
     // Variables saved to populate VkFunctorInitParams.
     static const uint32_t mAPIVersion = VK_MAKE_VERSION(1, 1, 0);
diff --git a/libs/hwui/tests/common/TestUtils.h b/libs/hwui/tests/common/TestUtils.h
index c1d8b76..771c345 100644
--- a/libs/hwui/tests/common/TestUtils.h
+++ b/libs/hwui/tests/common/TestUtils.h
@@ -50,12 +50,12 @@
         ADD_FAILURE() << "ClipState not a rect";                                     \
     }
 
-#define INNER_PIPELINE_TEST(test_case_name, test_name, pipeline, functionCall) \
-    TEST(test_case_name, test_name##_##pipeline) {                             \
-        RenderPipelineType oldType = Properties::getRenderPipelineType();      \
-        Properties::overrideRenderPipelineType(RenderPipelineType::pipeline);  \
-        functionCall;                                                          \
-        Properties::overrideRenderPipelineType(oldType);                       \
+#define INNER_PIPELINE_TEST(test_case_name, test_name, pipeline, functionCall)      \
+    TEST(test_case_name, test_name##_##pipeline) {                                  \
+        RenderPipelineType oldType = Properties::getRenderPipelineType();           \
+        Properties::overrideRenderPipelineType(RenderPipelineType::pipeline, true); \
+        functionCall;                                                               \
+        Properties::overrideRenderPipelineType(oldType, true);                      \
     };
 
 #define INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, pipeline) \
@@ -67,29 +67,27 @@
  * Like gtest's TEST, but runs on the RenderThread, and 'renderThread' is passed, in top level scope
  * (for e.g. accessing its RenderState)
  */
-#define RENDERTHREAD_TEST(test_case_name, test_name)                                        \
-    class test_case_name##_##test_name##_RenderThreadTest {                                 \
-    public:                                                                                 \
-        static void doTheThing(renderthread::RenderThread& renderThread);                   \
-    };                                                                                      \
-    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaGL);                    \
-    /* Temporarily disabling Vulkan until we can figure out a way to stub out the driver */ \
-    /* INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaVulkan); */          \
-    void test_case_name##_##test_name##_RenderThreadTest::doTheThing(                       \
+#define RENDERTHREAD_TEST(test_case_name, test_name)                         \
+    class test_case_name##_##test_name##_RenderThreadTest {                  \
+    public:                                                                  \
+        static void doTheThing(renderthread::RenderThread& renderThread);    \
+    };                                                                       \
+    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaGL);     \
+    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaVulkan); \
+    void test_case_name##_##test_name##_RenderThreadTest::doTheThing(        \
             renderthread::RenderThread& renderThread)
 
 /**
  * Like RENDERTHREAD_TEST, but only runs with the Skia RenderPipelineTypes
  */
-#define RENDERTHREAD_SKIA_PIPELINE_TEST(test_case_name, test_name)                          \
-    class test_case_name##_##test_name##_RenderThreadTest {                                 \
-    public:                                                                                 \
-        static void doTheThing(renderthread::RenderThread& renderThread);                   \
-    };                                                                                      \
-    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaGL);                    \
-    /* Temporarily disabling Vulkan until we can figure out a way to stub out the driver */ \
-    /* INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaVulkan); */          \
-    void test_case_name##_##test_name##_RenderThreadTest::doTheThing(                       \
+#define RENDERTHREAD_SKIA_PIPELINE_TEST(test_case_name, test_name)           \
+    class test_case_name##_##test_name##_RenderThreadTest {                  \
+    public:                                                                  \
+        static void doTheThing(renderthread::RenderThread& renderThread);    \
+    };                                                                       \
+    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaGL);     \
+    INNER_PIPELINE_RENDERTHREAD_TEST(test_case_name, test_name, SkiaVulkan); \
+    void test_case_name##_##test_name##_RenderThreadTest::doTheThing(        \
             renderthread::RenderThread& renderThread)
 
 /**