50de51387f
Instead of just returning 0/-1 and letting the caller make up a meaningless error message, add an Error parameter to allow reporting the real error and switch to 0/-errno so that different kind of errors can be distinguished in the caller. config_len in vhost_user_get_config() is defined by the device, so if it's larger than VHOST_USER_MAX_CONFIG_SIZE, this is a programming error. Turn the corresponding check into an assertion. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20210609154658.350308-6-kwolf@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
152 lines
4.7 KiB
C
152 lines
4.7 KiB
C
#ifndef VHOST_H
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#define VHOST_H
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#include "hw/virtio/vhost-backend.h"
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#include "hw/virtio/virtio.h"
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#include "exec/memory.h"
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/* Generic structures common for any vhost based device. */
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struct vhost_inflight {
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int fd;
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void *addr;
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uint64_t size;
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uint64_t offset;
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uint16_t queue_size;
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};
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struct vhost_virtqueue {
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int kick;
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int call;
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void *desc;
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void *avail;
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void *used;
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int num;
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unsigned long long desc_phys;
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unsigned desc_size;
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unsigned long long avail_phys;
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unsigned avail_size;
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unsigned long long used_phys;
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unsigned used_size;
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EventNotifier masked_notifier;
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struct vhost_dev *dev;
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};
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typedef unsigned long vhost_log_chunk_t;
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#define VHOST_LOG_PAGE 0x1000
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#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
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#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
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#define VHOST_INVALID_FEATURE_BIT (0xff)
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struct vhost_log {
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unsigned long long size;
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int refcnt;
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int fd;
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vhost_log_chunk_t *log;
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};
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struct vhost_dev;
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struct vhost_iommu {
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struct vhost_dev *hdev;
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MemoryRegion *mr;
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hwaddr iommu_offset;
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IOMMUNotifier n;
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QLIST_ENTRY(vhost_iommu) iommu_next;
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};
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typedef struct VhostDevConfigOps {
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/* Vhost device config space changed callback
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*/
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int (*vhost_dev_config_notifier)(struct vhost_dev *dev);
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} VhostDevConfigOps;
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struct vhost_memory;
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struct vhost_dev {
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VirtIODevice *vdev;
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MemoryListener memory_listener;
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MemoryListener iommu_listener;
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struct vhost_memory *mem;
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int n_mem_sections;
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MemoryRegionSection *mem_sections;
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int n_tmp_sections;
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MemoryRegionSection *tmp_sections;
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struct vhost_virtqueue *vqs;
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int nvqs;
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/* the first virtqueue which would be used by this vhost dev */
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int vq_index;
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/* if non-zero, minimum required value for max_queues */
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int num_queues;
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uint64_t features;
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uint64_t acked_features;
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uint64_t backend_features;
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uint64_t protocol_features;
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uint64_t max_queues;
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uint64_t backend_cap;
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bool started;
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bool log_enabled;
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uint64_t log_size;
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Error *migration_blocker;
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const VhostOps *vhost_ops;
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void *opaque;
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struct vhost_log *log;
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QLIST_ENTRY(vhost_dev) entry;
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QLIST_HEAD(, vhost_iommu) iommu_list;
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IOMMUNotifier n;
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const VhostDevConfigOps *config_ops;
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};
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struct vhost_net {
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struct vhost_dev dev;
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struct vhost_virtqueue vqs[2];
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int backend;
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NetClientState *nc;
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};
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int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
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VhostBackendType backend_type,
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uint32_t busyloop_timeout, Error **errp);
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void vhost_dev_cleanup(struct vhost_dev *hdev);
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int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
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void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
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int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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/* Test and clear masked event pending status.
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* Should be called after unmask to avoid losing events.
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*/
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bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
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/* Mask/unmask events from this vq.
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*/
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void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
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bool mask);
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uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
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uint64_t features);
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void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
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uint64_t features);
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bool vhost_has_free_slot(void);
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int vhost_net_set_backend(struct vhost_dev *hdev,
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struct vhost_vring_file *file);
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int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
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int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config,
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uint32_t config_len, Error **errp);
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int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data,
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uint32_t offset, uint32_t size, uint32_t flags);
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/* notifier callback in case vhost device config space changed
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*/
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void vhost_dev_set_config_notifier(struct vhost_dev *dev,
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const VhostDevConfigOps *ops);
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void vhost_dev_reset_inflight(struct vhost_inflight *inflight);
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void vhost_dev_free_inflight(struct vhost_inflight *inflight);
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void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f);
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int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f);
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int vhost_dev_prepare_inflight(struct vhost_dev *hdev, VirtIODevice *vdev);
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int vhost_dev_set_inflight(struct vhost_dev *dev,
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struct vhost_inflight *inflight);
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int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
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struct vhost_inflight *inflight);
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#endif
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