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-rw-r--r--hw/virtio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/virtio.h b/hw/virtio.h
index 18c7a1a7c..cce8a4747 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -32,6 +32,8 @@
/* We notify when the ring is completely used, even if the guest is supressing
* callbacks */
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+/* A guest should never accept this. It implies negotiation is broken. */
+#define VIRTIO_F_BAD_FEATURE 30
/* from Linux's linux/virtio_ring.h */
@@ -82,6 +84,7 @@ struct VirtIODevice
size_t config_len;
void *config;
uint32_t (*get_features)(VirtIODevice *vdev);
+ uint32_t (*bad_features)(VirtIODevice *vdev);
void (*set_features)(VirtIODevice *vdev, uint32_t val);
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
void (*set_config)(VirtIODevice *vdev, const uint8_t *config);