在 2021/8/16 下午1:36, Michael S. Tsirkin 写道:
On Mon, Aug 16, 2021 at 10:51:57AM +0800, Jason Wang wrote:
On Thu, Aug 12, 2021 at 10:09 PM Eugenio Pérez<epere...@redhat.com> wrote:
With the introduction of the batch hinting, meaningless batches can be
created with no IOTLB updates if the memory region was skipped by
vhost_vdpa_listener_skipped_section. This is the case of host notifiers
memory regions, device un/realize, and others. This causes the vdpa
device to receive dma mapping settings with no changes, a possibly
expensive operation for nothing.
To avoid that, VHOST_IOTLB_BATCH_BEGIN hint is delayed until we have a
meaningful (not skipped section) mapping or unmapping operation, and
VHOST_IOTLB_BATCH_END is not written unless at least one of _UPDATE /
_INVALIDATE has been issued.
Acked-by: Jason Wang<jasow...@redhat.com>
Oops. You missed by pull request by a hairwidth.
It's fine.
Thanks
