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Message-Id: <20230407133658.66339-1-sgarzare@redhat.com>
Date:   Fri,  7 Apr 2023 15:36:56 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Alvaro Karsz <alvaro.karsz@...id-run.com>,
        linux-kernel@...r.kernel.org,
        Eugenio PĂ©rez Martin <eperezma@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH 0/2] vdpa_sim_blk: support shared backend

This series is mainly for testing live migration between 2 vdpa_sim_blk
devices.

The first patch is preparation and moves the buffer allocation into devices,
the second patch adds the `shared_buffer_mutex` parameter to vdpa_sim_blk to
use the same ramdisk for all devices.

Tested with QEMU v8.0.0-rc2 in this way:

modprobe vhost_vdpa
modprobe vdpa_sim_blk shared_backend=true

vdpa dev add mgmtdev vdpasim_blk name blk0
vdpa dev add mgmtdev vdpasim_blk name blk1

qemu-system-x86_64 -m 512M -smp 2 -M q35,accel=kvm,memory-backend=mem \
  -object memory-backend-file,share=on,id=mem,size="512M",mem-path="/dev/shm"
  ...
  -blockdev node-name=drive_src1,driver=virtio-blk-vhost-vdpa,path=/dev/vhost-vdpa-1,cache.direct=on \
  -device virtio-blk-pci,id=src1,bootindex=2,drive=drive_src1 \
  -incoming tcp:0:3333

qemu-system-x86_64 -m 512M -smp 2 -M q35,accel=kvm,memory-backend=mem \
  -object memory-backend-file,share=on,id=mem,size="512M",mem-path="/dev/shm"
  ...
  -blockdev node-name=drive_src1,driver=virtio-blk-vhost-vdpa,path=/dev/vhost-vdpa-0,cache.direct=on \
  -device virtio-blk-pci,id=src1,bootindex=2,drive=drive_src1

(qemu) migrate -d tcp:0:3333

Stefano Garzarella (2):
  vdpa_sim: move buffer allocation in the devices
  vdpa_sim_blk: support shared backend

 drivers/vdpa/vdpa_sim/vdpa_sim.h     |  3 +-
 drivers/vdpa/vdpa_sim/vdpa_sim.c     |  7 +--
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 83 +++++++++++++++++++++++++---
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 28 +++++++---
 4 files changed, 100 insertions(+), 21 deletions(-)

-- 
2.39.2

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