> > This is faster than VHOST_RESET_OWNER + VHOST_SET_OWNER + VHOST_IOTLB_UPDATE, > as that would would unpin and repin physical pages, which would cost multiple > seconds for large memories. > > This is implemented in QEMU by the patch series "Live update: vdpa" > https://lore.kernel.org/qemu-devel/TBD (reference to be posted shortly) > > The QEMU implementation leverages the live migration code path, but after > CPR exec's new QEMU: > - vhost_vdpa_set_owner() calls VHOST_NEW_OWNER instead of VHOST_SET_OWNER > - vhost_vdpa_dma_map() sets type VHOST_IOTLB_REMAP instead of > VHOST_IOTLB_UPDATE > > Changes in V2: > - clean up handling of set_map vs dma_map vs platform iommu in remap > - augment and clarify commit messages and comments > > Steve Sistare (7): > vhost-vdpa: count pinned memory > vhost-vdpa: pass mm to bind > vhost-vdpa: VHOST_NEW_OWNER > vhost-vdpa: VHOST_BACKEND_F_NEW_OWNER > vhost-vdpa: VHOST_IOTLB_REMAP > vhost-vdpa: VHOST_BACKEND_F_IOTLB_REMAP > vdpa/mlx5: new owner capability > > drivers/vdpa/mlx5/net/mlx5_vnet.c | 3 +- > drivers/vhost/vdpa.c | 125 ++++++++++++++++++++++++++++-- > drivers/vhost/vhost.c | 15 ++++ > drivers/vhost/vhost.h | 1 + > include/uapi/linux/vhost.h | 10 +++ > include/uapi/linux/vhost_types.h | 15 +++- > 6 files changed, 161 insertions(+), 8 deletions(-) > > -- > 2.39.3 > Thanks
