45b1403f42
Add virtio.c and virtio.h that define the functions needed to manage virtqueues. Signed-off-by: Laurent Vivier <lvivier@redhat.com>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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//
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/* come parts copied from QEMU subprojects/libvhost-user/libvhost-user.h */
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#ifndef VIRTIO_H
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#define VIRTIO_H
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#include <stdbool.h>
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#include <linux/vhost_types.h>
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#define VIRTQUEUE_MAX_SIZE 1024
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#define vu_panic(vdev, ...) \
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do { \
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(vdev)->broken = true; \
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err( __VA_ARGS__ ); \
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} while (0)
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typedef struct VuRing {
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unsigned int num;
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struct vring_desc *desc;
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struct vring_avail *avail;
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struct vring_used *used;
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uint64_t log_guest_addr;
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uint32_t flags;
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} VuRing;
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typedef struct VuVirtq {
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VuRing vring;
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/* Next head to pop */
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uint16_t last_avail_idx;
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/* Last avail_idx read from VQ. */
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uint16_t shadow_avail_idx;
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uint16_t used_idx;
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/* Last used index value we have signalled on */
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uint16_t signalled_used;
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/* Last used index value we have signalled on */
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bool signalled_used_valid;
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bool notification;
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unsigned int inuse;
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int call_fd;
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int kick_fd;
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int err_fd;
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unsigned int enable;
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bool started;
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/* Guest addresses of our ring */
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struct vhost_vring_addr vra;
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} VuVirtq;
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typedef struct VuDevRegion {
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uint64_t gpa;
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uint64_t size;
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uint64_t qva;
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uint64_t mmap_offset;
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uint64_t mmap_addr;
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} VuDevRegion;
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#define VHOST_USER_MAX_QUEUES 2
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/*
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* Set a reasonable maximum number of ram slots, which will be supported by
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* any architecture.
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*/
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#define VHOST_USER_MAX_RAM_SLOTS 32
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typedef struct VuDev {
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uint32_t nregions;
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VuDevRegion regions[VHOST_USER_MAX_RAM_SLOTS];
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VuVirtq vq[VHOST_USER_MAX_QUEUES];
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uint64_t features;
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uint64_t protocol_features;
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bool broken;
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int hdrlen;
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} VuDev;
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typedef struct VuVirtqElement {
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unsigned int index;
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unsigned int out_num;
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unsigned int in_num;
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struct iovec *in_sg;
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struct iovec *out_sg;
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} VuVirtqElement;
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static inline bool has_feature(uint64_t features, unsigned int fbit)
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{
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return !!(features & (1ULL << fbit));
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}
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static inline bool vu_has_feature(VuDev *vdev, unsigned int fbit)
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{
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return has_feature(vdev->features, fbit);
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}
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static inline bool vu_has_protocol_feature(VuDev *vdev, unsigned int fbit)
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{
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return has_feature(vdev->protocol_features, fbit);
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}
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bool vu_queue_empty(VuDev *dev, VuVirtq *vq);
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void vu_queue_notify(VuDev *dev, VuVirtq *vq);
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void *vu_queue_pop(VuDev *dev, VuVirtq *vq, size_t sz, unsigned char *buffer);
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void vu_queue_detach_element(VuDev *dev, VuVirtq *vq, unsigned int index, size_t len);
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void vu_queue_unpop(VuDev *dev, VuVirtq *vq, unsigned int index, size_t len);
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bool vu_queue_rewind(VuDev *dev, VuVirtq *vq, unsigned int num);
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void vu_queue_fill_by_index(VuDev *dev, VuVirtq *vq, unsigned int index,
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unsigned int len, unsigned int idx);
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void vu_queue_fill(VuDev *dev, VuVirtq *vq, VuVirtqElement *elem, unsigned int len,
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unsigned int idx);
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void vu_queue_flush(VuDev *dev, VuVirtq *vq, unsigned int count);
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void vu_queue_push(VuDev *dev, VuVirtq *vq, VuVirtqElement *elem, unsigned int len);
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#endif /* VIRTIO_H */
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