diff -up mesa-20.3.0-rc1/src/gallium/frontends/lavapipe/lvp_device.c.dma mesa-20.3.0-rc1/src/gallium/frontends/lavapipe/lvp_device.c

--- mesa-20.3.0-rc1/src/gallium/frontends/lavapipe/lvp_device.c.dma	2020-11-19 15:11:42.483134826 +1000

+++ mesa-20.3.0-rc1/src/gallium/frontends/lavapipe/lvp_device.c	2020-11-19 15:13:08.556425782 +1000

@@ -118,6 +118,9 @@ VkResult lvp_CreateInstance(

       client_version = VK_API_VERSION_1_0;

    }

+   if (!getenv("RH_SW_VULKAN"))

+      return VK_ERROR_INITIALIZATION_FAILED;

+

    instance = vk_zalloc2(&default_alloc, pAllocator, sizeof(*instance), 8,

                          VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);

    if (!instance)