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In order to reduce excessive memory mapping cost in live migration and VM reboot, it is desirable to decouple the vhost-vdpa IOTLB abstraction from the virtio device life cycle, i.e. mappings can be kept intact across virtio device reset. Leverage the .reset_map callback, which is meant to destroy the iotlb on the given ASID and recreate the 1:1 passthrough/identity mapping. To be consistent, the mapping on device creation is initiailized to passthrough/identity with PA 1:1 mapped as IOVA. With this the device .reset op doesn't have to maintain and clean up memory mappings by itself. Additionally, implement .compat_reset to cater for older userspace, which may wish to see mapping to be cleared during reset. Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com> Tested-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <1697880319-4937-8-git-send-email-si-wei.liu@oracle.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Lei Yang <leiyang@redhat.com> |
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| Makefile | ||
| vdpa_sim_blk.c | ||
| vdpa_sim_net.c | ||
| vdpa_sim.c | ||
| vdpa_sim.h | ||