Get descriptor content from vq from the qemu monitor. The VM shall be stopped otherwise the content could not be correct. A better way to do this is by using gdb.

gistfile1.txt

(qemu) info virtio
/machine/peripheral-anon/device[2]/virtio-backend [virtio-blk]
/machine/peripheral-anon/device[1]/virtio-backend [virtio-sound]
/machine/peripheral-anon/device[0]/virtio-backend [virtio-net]
(qemu) info virtio-queue-element  /machine/peripheral-anon/device[1]/virtio-backend 2 
/machine/peripheral-anon/device[1]/virtio-backend:
  device_name: virtio-sound
  index:   12
  desc:
    descs:
        addr 0x102b2268c len 8 (write),
        addr 0x107c10800 len 1024 (next),
        addr 0x102b22688 len 4 (next)
  avail:
    flags: 0
    idx:   23907
    ring:  12
  used:
    flags: 0
    idx:   23907
(qemu) xp/80hx 0x107c10800
0000000107c10800: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10810: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10820: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10830: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10840: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10850: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10860: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10870: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10880: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
0000000107c10890: 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
(qemu)