/* * 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 "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 /* A guest should never accept this. It implies negotiation is broken. */ #define VIRTIO_F_BAD_FEATURE 30 /* 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; static inline target_phys_addr_t vring_align(target_phys_addr_t addr, unsigned long align) { return (addr + align - 1) & ~(align - 1); } 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); 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); 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, uint16_t class_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