This series enables shadowed CVQ to intercept VIRTIO_NET_CTRL_MQ_HASH_CONFIG command through shadowed CVQ, update the virtio NIC device model so qemu send it in a migration, and the restore of that Hash calculation state in the destination.
ChangeLog ========= v3: - remove the `do_rss` argument in vhost_vdpa_net_load_rss() - zero reserved fields in "cfg" manually instead of using memset() to prevent compiler "array-bounds" warning v2: https://lore.kernel.org/all/cover.1693297766.git.yin31...@gmail.com/ - resolve conflict with updated patch "vdpa: Send all CVQ state load commands in parallel", move the `table` declaration at the beginning of the vhost_vdpa_net_load_rss() in patch "vdpa: Restore hash calculation state" RFC: https://lore.kernel.org/all/cover.1691762906.git.yin31...@gmail.com/#t TestStep ======== 1. test the migration using vp-vdpa device - For L0 guest, boot QEMU with two virtio-net-pci net device with `ctrl_vq`, `mq`, `hash` features on, command line like: -netdev tap,... -device virtio-net-pci,disable-legacy=on,disable-modern=off, iommu_platform=on,mq=on,ctrl_vq=on,hash=on,guest_announce=off, indirect_desc=off,queue_reset=off,guest_uso4=off,guest_uso6=off, host_uso=off,... - For L1 guest, apply the relative patch series and compile the source code, start QEMU with two vdpa device with svq mode on, enable the `ctrl_vq`, `mq`, `hash` features on, command line like: -netdev type=vhost-vdpa,x-svq=true,... -device virtio-net-pci,mq=on,guest_announce=off,ctrl_vq=on, hash=on,... - For L2 source guest, run the following bash command: ```bash #!/bin/sh ethtool -K eth0 rxhash on ``` - Gdb attach the destination VM and break at the vhost_vdpa_net_load_rss() - Execute the live migration in L2 source monitor - Result * with this series, gdb can hit the breakpoint and continue the executing without triggering any error or warning. Hawkins Jiawei (2): vdpa: Restore hash calculation state vdpa: Allow VIRTIO_NET_F_HASH_REPORT in SVQ net/vhost-vdpa.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) -- 2.25.1
