vdpa_sim: get rid of DMA ops

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We used to (ab)use the DMA ops for setting up identical mappings in
the IOTLB. This patch tries to get rid of the those unnecessary DMA
ops by maintaining a simple identical/passthrough mappings by
default. When bound to virtio_vdpa driver, DMA API will simply use PA
as the IOVA and we will be all fine. When the vDPA bus tries to setup
customized mapping (e.g when bound to vhost-vDPA), the
identical/passthrough mapping will be removed.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221223060021.28011-1-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>

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Jason Wang 2022-12-23 14:00:21 +08:00 • committed by Michael S. Tsirkin

parent 0899774cb3

commit 6c3d329e64

2 changed files with 22 additions and 150 deletions

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170

drivers/vdpa/vdpa_sim/vdpa_sim.c

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2

drivers/vdpa/vdpa_sim/vdpa_sim.h

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