Hi all,
I tried with the patch at:
https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg00394.html
The patch is applied to qemu-3.0.0.
Below configuration is used to test the feature for guest VM nvme.
# qemu-system-x86_64 \
-smp 4 -m 2000M -enable-kvm -vnc :0 -monitor stdio \
-net nic -net user,hostfwd=tcp::5022-:22 \
-drive file=virtio-disk.img,format=raw,if=none,id=disk0 \
-device virtio-blk-pci,drive=disk0,id=disk0-dev,num-queues=2,iothread=io1 \
-object iothread,id=io1 \
-device nvme,drive=nvme1,serial=deadbeaf1 \
-drive file=blkdebug:blkdebug.config:nvme.img,if=none,id=nvme1
# cat blkdebug.config
[delay]
event = "write_aio"
latency = "9999999999"
sector = "40960"
The 'write' latency of sector=40960 is set to a very large value. When the I/O
is stalled in guest due to that sector=40960 is accessed, I do see below
messages in guest log:
[ 80.807755] nvme nvme0: I/O 11 QID 2 timeout, aborting
[ 80.808095] nvme nvme0: Abort status: 0x4001
However, then nothing happens further. nvme I/O hangs in guest. I am not able to
kill the qemu process with Ctrl+C. Both vnc and qemu user net do not work. I
need to kill qemu with "kill -9"
The same result for virtio-scsi and qemu is stuck as well.