c471ad0e9b
This patches implements Device IOTLB support for vhost kernel. This is done through: 1) switch to use dma helpers when map/unmap vrings from vhost codes 2) introduce a set of VhostOps to: - setting up device IOTLB request callback - processing device IOTLB request - processing device IOTLB invalidation 2) kernel support for Device IOTLB API: - allow vhost-net to query the IOMMU IOTLB entry through eventfd - enable the ability for qemu to update a specified mapping of vhost - through ioctl. - enable the ability to invalidate a specified range of iova for the device IOTLB of vhost through ioctl. In x86/intel_iommu case this is triggered through iommu memory region notifier from device IOTLB invalidation descriptor processing routine. With all the above, kernel vhost_net can co-operate with userspace IOMMU. For vhost-user, the support could be easily done on top by implementing the VhostOps. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
#ifndef VHOST_H
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#define VHOST_H
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#include "hw/hw.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_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_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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struct vhost_memory *mem;
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int n_mem_sections;
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MemoryRegionSection *mem_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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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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bool memory_changed;
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hwaddr mem_changed_start_addr;
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hwaddr mem_changed_end_addr;
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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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IOMMUNotifier n;
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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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void vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
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#endif
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