Fix a virtio ring buffer free run index overflow bug

[palacios.git] / palacios / include / devices / lnx_virtio_pci.h

diff --git a/palacios/include/devices/lnx_virtio_pci.h b/palacios/include/devices/lnx_virtio_pci.h
index 9e6e69f..5ecf694 100644 (file)
--- a/palacios/include/devices/lnx_virtio_pci.h
+++ b/palacios/include/devices/lnx_virtio_pci.h
@@ -34,9 +34,12 @@
 #define VIRTIO_BLOCK_DEV_ID       0x1001
 #define VIRTIO_BALLOON_DEV_ID     0x1002
 #define VIRTIO_CONSOLE_DEV_ID     0x1003
+#define VIRTIO_SYMBIOTIC_DEV_ID   0x100a
 
+#define VIRTIO_NET_SUBDEVICE_ID 1
 #define VIRTIO_BLOCK_SUBDEVICE_ID 2
 #define VIRTIO_BALLOON_SUBDEVICE_ID 5
+#define VIRTIO_SYMBIOTIC_SUBDEVICE_ID 10
 
 
 #define HOST_FEATURES_PORT 0
@@ -67,6 +70,13 @@
 /* This means don't interrupt guest when buffer consumed. */
 #define VIRTIO_NO_IRQ_FLAG      0x1
 
+
+/* ISR Flags */
+#define VIRTIO_ISR_ACTIVE 0x1
+#define VIRTIO_ISR_CFG_CHANGED 0x2
+
+
+
 /* The virtio configuration space is a hybrid io/memory mapped model 
  * All IO is done via IO port accesses
  * The IO ports access fields in a virtio data structure, and the base io port 
@@ -118,6 +128,8 @@ struct virtio_queue {
     uint16_t queue_size;
   
     uint16_t cur_avail_idx;
+    uint16_t last_avail_idx;
+    bool idx_overflow;
 
     addr_t ring_desc_addr;
     addr_t ring_avail_addr;