gfxstream: address-space graphics requires kParamResourceBlob and kParamHostVisible

Make init failure more clear if this is not the case.

Reviewed-by: Gurchetan Singh <gurchetansingh@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37285>

src/gfxstream/guest/GoldfishAddressSpace/VirtioGpuAddressSpaceStream.cpp

@@ -84,6 +84,15 @@ AddressSpaceStream* createVirtioGpuAddressSpaceStream(enum VirtGpuCapset capset)
     VirtGpuDevice* instance = VirtGpuDevice::getInstance();
     auto caps = instance->getCaps();
 
+    if (!caps.params[kParamResourceBlob]) {
+        mesa_loge("VirtGpuDevice does not support blob-resources!");
+        return nullptr;
+    }
+    if (!caps.params[kParamHostVisible] && !caps.params[kParamCreateGuestHandle]) {
+        mesa_loge("VirtGpuDevice must support at least one of: 1) host-visible memory (kParamHostVisible) or 2) host handles created from guest memory (kParamCreateGuestHandle).");
+        return nullptr;
+    }
+
     if (!GetRingParamsFromCapset(capset, caps, ringSize, bufferSize, blobAlignment)) {
         mesa_loge("Failed to get ring parameters");
         return nullptr;

src/gfxstream/guest/platform/drm/DrmVirtGpuDevice.cpp

@@ -194,7 +194,7 @@ int32_t DrmVirtGpuDevice::init(int32_t descriptor) {
 
         ret = drmIoctl(mDeviceHandle, DRM_IOCTL_VIRTGPU_GETPARAM, &get_param);
         if (ret) {
-            mesa_logd("virtgpu backend not enabling %s", params[i].name);
+            mesa_logd("Could not query virtgpu param from device: %s", params[i].name);
             continue;
         }