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vhost_net: device IOTLB support

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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>
This commit is contained in:
Jason Wang
2017-01-11 12:32:12 +08:00
committed by Michael S. Tsirkin
parent 1448c133e1
commit c471ad0e9b
6 changed files with 262 additions and 22 deletions
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13
include/hw/virtio/vhost-backend.h
View File

@@ -11,6 +11,8 @@
#ifndef VHOST_BACKEND_H
#define VHOST_BACKEND_H
#include "exec/memory.h"
typedef enum VhostBackendType {
VHOST_BACKEND_TYPE_NONE = 0,
VHOST_BACKEND_TYPE_KERNEL = 1,
@@ -77,6 +79,14 @@ typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev,
typedef int (*vhost_vsock_set_guest_cid_op)(struct vhost_dev *dev,
uint64_t guest_cid);
typedef int (*vhost_vsock_set_running_op)(struct vhost_dev *dev, int start);
typedef void (*vhost_set_iotlb_callback_op)(struct vhost_dev *dev,
int enabled);
typedef int (*vhost_update_device_iotlb_op)(struct vhost_dev *dev,
uint64_t iova, uint64_t uaddr,
uint64_t len,
IOMMUAccessFlags perm);
typedef int (*vhost_invalidate_device_iotlb_op)(struct vhost_dev *dev,
uint64_t iova, uint64_t len);
typedef struct VhostOps {
VhostBackendType backend_type;
@@ -109,6 +119,9 @@ typedef struct VhostOps {
vhost_backend_can_merge_op vhost_backend_can_merge;
vhost_vsock_set_guest_cid_op vhost_vsock_set_guest_cid;
vhost_vsock_set_running_op vhost_vsock_set_running;
vhost_set_iotlb_callback_op vhost_set_iotlb_callback;
vhost_update_device_iotlb_op vhost_update_device_iotlb;
vhost_invalidate_device_iotlb_op vhost_invalidate_device_iotlb;
} VhostOps;
extern const VhostOps user_ops;