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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-04 19:38:57 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-04 19:38:57 +0000
commit967f97fa00b2d301584d08c614d446423c65c15a (patch)
tree2a3338b25ca9111f7214c55fe022e12be5dc6860 /hw/virtio.h
parentb39ade83c2eafc231d239c2083b65c84a79bb134 (diff)
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Virtio core support
This patch adds core support for VirtIO. VirtIO is a paravirtualization framework that has been in Linux since 2.6.21. A PCI transport has been available since 2.6.25. Network drivers are also available for Windows. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5869 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/virtio.h')
-rw-r--r--hw/virtio.h121
1 files changed, 121 insertions, 0 deletions
diff --git a/hw/virtio.h b/hw/virtio.h
new file mode 100644
index 0000000..f04e75f
--- /dev/null
+++ b/hw/virtio.h
@@ -0,0 +1,121 @@
+/*
+ * Virtio Support
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ * Anthony Liguori <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef _QEMU_VIRTIO_H
+#define _QEMU_VIRTIO_H
+
+#include <sys/uio.h>
+#include "hw.h"
+#include "pci.h"
+
+/* from Linux's linux/virtio_config.h */
+
+/* Status byte for guest to report progress, and synchronize features. */
+/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
+#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
+/* We have found a driver for the device. */
+#define VIRTIO_CONFIG_S_DRIVER 2
+/* Driver has used its parts of the config, and is happy */
+#define VIRTIO_CONFIG_S_DRIVER_OK 4
+/* We've given up on this device. */
+#define VIRTIO_CONFIG_S_FAILED 0x80
+
+/* We notify when the ring is completely used, even if the guest is supressing
+ * callbacks */
+#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+
+/* from Linux's linux/virtio_ring.h */
+
+/* This marks a buffer as continuing via the next field. */
+#define VRING_DESC_F_NEXT 1
+/* This marks a buffer as write-only (otherwise read-only). */
+#define VRING_DESC_F_WRITE 2
+
+/* This means don't notify other side when buffer added. */
+#define VRING_USED_F_NO_NOTIFY 1
+/* This means don't interrupt guest when buffer consumed. */
+#define VRING_AVAIL_F_NO_INTERRUPT 1
+
+struct VirtQueue;
+
+typedef struct VirtQueue VirtQueue;
+typedef struct VirtIODevice VirtIODevice;
+
+#define VIRTQUEUE_MAX_SIZE 1024
+
+typedef struct VirtQueueElement
+{
+ unsigned int index;
+ unsigned int out_num;
+ unsigned int in_num;
+ target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
+ struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
+ struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
+} VirtQueueElement;
+
+#define VIRTIO_PCI_QUEUE_MAX 16
+
+struct VirtIODevice
+{
+ PCIDevice pci_dev;
+ const char *name;
+ uint32_t addr;
+ uint8_t status;
+ uint8_t isr;
+ uint16_t queue_sel;
+ uint32_t features;
+ size_t config_len;
+ void *config;
+ uint32_t (*get_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);
+ void (*reset)(VirtIODevice *vdev);
+ VirtQueue *vq;
+};
+
+VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
+ uint16_t vendor, uint16_t device,
+ uint16_t subvendor, uint16_t subdevice,
+ uint8_t class_code, uint8_t subclass_code,
+ uint8_t pif, size_t config_size,
+ size_t struct_size);
+
+VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
+ void (*handle_output)(VirtIODevice *,
+ VirtQueue *));
+
+void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len);
+void virtqueue_flush(VirtQueue *vq, unsigned int count);
+void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len, unsigned int idx);
+
+int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
+int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
+
+void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
+
+void virtio_save(VirtIODevice *vdev, QEMUFile *f);
+
+void virtio_load(VirtIODevice *vdev, QEMUFile *f);
+
+void virtio_notify_config(VirtIODevice *vdev);
+
+void virtio_queue_set_notification(VirtQueue *vq, int enable);
+
+int virtio_queue_ready(VirtQueue *vq);
+
+int virtio_queue_empty(VirtQueue *vq);
+
+#endif