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| author | Si-Wei Liu <si-wei.liu@oracle.com> | 2023-10-21 12:25:19 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-11-01 16:20:00 +0300 |
| commit | 86f6c224c97911b4392cb7b402e6a4ed323a449e (patch) | |
| tree | 8e390d759719a35753e486accf0480511e08eb80 /drivers/virtio | |
| parent | 2eacf4b5e3ebe771f0fca0c8913c5a10a1953b72 (diff) | |
| download | linux-86f6c224c97911b4392cb7b402e6a4ed323a449e.tar.xz | |
vdpa_sim: implement .reset_map support
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>
Diffstat (limited to 'drivers/virtio')
0 files changed, 0 insertions, 0 deletions