virtio: new feature to detect IOMMU device quirk

[cascardo/linux.git] / include / uapi / linux / virtio_config.h

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 4cb65bb..308e209 100644 (file)
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -49,7 +49,7 @@
  * transport being used (eg. virtio_ring), the rest are per-device feature
  * bits. */
 #define VIRTIO_TRANSPORT_F_START       28
-#define VIRTIO_TRANSPORT_F_END         33
+#define VIRTIO_TRANSPORT_F_END         34
 
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
@@ -63,4 +63,12 @@
 /* v1.0 compliant. */
 #define VIRTIO_F_VERSION_1             32
 
+/*
+ * If clear - device has the IOMMU bypass quirk feature.
+ * If set - use platform tools to detect the IOMMU.
+ *
+ * Note the reverse polarity (compared to most other features),
+ * this is for compatibility with legacy systems.
+ */
+#define VIRTIO_F_IOMMU_PLATFORM                33
 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */