b37556edec
This patch tries to switch to use new kernel IOTLB format V2. Previous
version may have inconsistent ABI between 32bit and 64bit machines
because of the hole after type field. Refer kernel commit
("429711aec282 vhost: switch to use new message format") for more
information.
To enable this feature, qemu need to use a new ioctl
VHOST_SET_BACKEND_FEATURE with VHOST_BACKEND_F_IOTLB_MSG_V2 bit. A new
vhost setting backend features ops was introduced. And when we try to
set features for vhost dev, we will examine the support of new IOTLB
format and enable it. This process is total transparent to guest,
which means we can have different IOTLB message type in src and dst
during migration.
The conversion of IOTLB message is straightforward, just check the
type and behave accordingly.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20200907104903.31551-3-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
149 lines
4.5 KiB
C
149 lines
4.5 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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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);
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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 *dev, uint8_t *config,
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uint32_t config_len);
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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_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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