Changes in uspace/lib/virtio/virtio.c [8d2289c:13eecc4] in mainline

File:

• uspace/lib/virtio/virtio.c (modified) (3 diffs)

uspace/lib/virtio/virtio.c

@@ -63 +63 @@
         uintptr_t phys;
         errno_t rc = dmamem_map_anonymous(buffers * size, 0,
-            write ? AS_AREA_WRITE : AS_AREA_READ, 0, &phys, &virt);
+            write ? AS_AREA_WRITE | AS_AREA_READ : AS_AREA_READ, 0, &phys,
+            &virt);
         if (rc != EOK)
                 return rc;
@@ -319 +320 @@
         uint32_t device_features = pio_read_le32(&cfg->device_feature);
 
-        ddf_msg(LVL_NOTE, "offered features %x", device_features);
+        uint32_t reserved_features = VIRTIO_F_VERSION_1;
+        pio_write_le32(&cfg->device_feature_select, VIRTIO_FEATURES_32_63);
+        uint32_t device_reserved_features = pio_read_le32(&cfg->device_feature);
+
+        ddf_msg(LVL_NOTE, "offered features %x, reserved features %x",
+            device_features, device_reserved_features);
 
         if (features != (features & device_features))
@@ -325 +331 @@
         features &= device_features;
 
+        if (reserved_features != (reserved_features & device_reserved_features))
+                return ENOTSUP;
+        reserved_features &= device_reserved_features;
+
         /* 4. Write the accepted feature flags */
         pio_write_le32(&cfg->driver_feature_select, VIRTIO_FEATURES_0_31);
         pio_write_le32(&cfg->driver_feature, features);
-
-        ddf_msg(LVL_NOTE, "accepted features %x", features);
+        pio_write_le32(&cfg->driver_feature_select, VIRTIO_FEATURES_32_63);
+        pio_write_le32(&cfg->driver_feature, reserved_features);
+
+        ddf_msg(LVL_NOTE, "accepted features %x, reserved features %x",
+            features, reserved_features);
 
         /* 5. Set FEATURES_OK */