Add qemu 2.4.0

[kvmfornfv.git] / qemu / include / hw / virtio / vhost.h

diff --git a/qemu/include/hw/virtio/vhost.h b/qemu/include/hw/virtio/vhost.h
new file mode 100644 (file)
index 0000000..dd51050
--- /dev/null
+++ b/qemu/include/hw/virtio/vhost.h
@@ -0,0 +1,84 @@
+#ifndef VHOST_H
+#define VHOST_H
+
+#include "hw/hw.h"
+#include "hw/virtio/vhost-backend.h"
+#include "hw/virtio/virtio.h"
+#include "exec/memory.h"
+
+/* Generic structures common for any vhost based device. */
+struct vhost_virtqueue {
+    int kick;
+    int call;
+    void *desc;
+    void *avail;
+    void *used;
+    int num;
+    unsigned long long used_phys;
+    unsigned used_size;
+    void *ring;
+    unsigned long long ring_phys;
+    unsigned ring_size;
+    EventNotifier masked_notifier;
+};
+
+typedef unsigned long vhost_log_chunk_t;
+#define VHOST_LOG_PAGE 0x1000
+#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
+#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
+#define VHOST_INVALID_FEATURE_BIT   (0xff)
+
+struct vhost_log {
+    unsigned long long size;
+    int refcnt;
+    vhost_log_chunk_t log[0];
+};
+
+struct vhost_memory;
+struct vhost_dev {
+    MemoryListener memory_listener;
+    struct vhost_memory *mem;
+    int n_mem_sections;
+    MemoryRegionSection *mem_sections;
+    struct vhost_virtqueue *vqs;
+    int nvqs;
+    /* the first virtqueue which would be used by this vhost dev */
+    int vq_index;
+    unsigned long long features;
+    unsigned long long acked_features;
+    unsigned long long backend_features;
+    bool started;
+    bool log_enabled;
+    unsigned long long log_size;
+    Error *migration_blocker;
+    bool memory_changed;
+    hwaddr mem_changed_start_addr;
+    hwaddr mem_changed_end_addr;
+    const VhostOps *vhost_ops;
+    void *opaque;
+    struct vhost_log *log;
+};
+
+int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
+                   VhostBackendType backend_type);
+void vhost_dev_cleanup(struct vhost_dev *hdev);
+bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);
+int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
+void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
+int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
+void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
+
+/* Test and clear masked event pending status.
+ * Should be called after unmask to avoid losing events.
+ */
+bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
+
+/* Mask/unmask events from this vq.
+ */
+void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
+                          bool mask);
+uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
+                            uint64_t features);
+void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
+                        uint64_t features);
+#endif