Re: [PATCH vhost v2 00/10] vdpa/mlx5: Parallelize device suspend/resume

Hi Lei,

On 02.09.24 12:03, Lei Yang wrote:

Hi Dragos

QE tested this series with mellanox nic, it failed with [1] when
booting guest, and host dmesg also will print messages [2]. This bug
can be reproduced boot guest with vhost-vdpa device.

[1] qemu) qemu-kvm: vhost VQ 1 ring restore failed: -1: Operation not
permitted (1)
qemu-kvm: vhost VQ 0 ring restore failed: -1: Operation not permitted (1)
qemu-kvm: unable to start vhost net: 5: falling back on userspace virtio
qemu-kvm: vhost_set_features failed: Device or resource busy (16)
qemu-kvm: unable to start vhost net: 16: falling back on userspace virtio

[2] Host dmesg:
[ 1406.187977] mlx5_core 0000:0d:00.2:
mlx5_vdpa_compat_reset:3267:(pid 8506): performing device reset
[ 1406.189221] mlx5_core 0000:0d:00.2:
mlx5_vdpa_compat_reset:3267:(pid 8506): performing device reset
[ 1406.190354] mlx5_core 0000:0d:00.2:
mlx5_vdpa_show_mr_leaks:573:(pid 8506) warning: mkey still alive after
resource delete: mr: 000000000c5ccca2, mkey: 0x40000000, refcount: 2
[ 1471.538487] mlx5_core 0000:0d:00.2: cb_timeout_handler:938:(pid
428): cmd[13]: MODIFY_GENERAL_OBJECT(0xa01) Async, timeout. Will cause
a leak of a command resource
[ 1471.539486] mlx5_core 0000:0d:00.2: cb_timeout_handler:938:(pid
428): cmd[12]: MODIFY_GENERAL_OBJECT(0xa01) Async, timeout. Will cause
a leak of a command resource
[ 1471.540351] mlx5_core 0000:0d:00.2: modify_virtqueues:1617:(pid
8511) error: modify vq 0 failed, state: 0 -> 0, err: 0
[ 1471.541433] mlx5_core 0000:0d:00.2: modify_virtqueues:1617:(pid
8511) error: modify vq 1 failed, state: 0 -> 0, err: -110
[ 1471.542388] mlx5_core 0000:0d:00.2: mlx5_vdpa_set_status:3203:(pid
8511) warning: failed to resume VQs
[ 1471.549778] mlx5_core 0000:0d:00.2:
mlx5_vdpa_show_mr_leaks:573:(pid 8511) warning: mkey still alive after
resource delete: mr: 000000000c5ccca2, mkey: 0x40000000, refcount: 2
[ 1512.929854] mlx5_core 0000:0d:00.2:
mlx5_vdpa_compat_reset:3267:(pid 8565): performing device reset
[ 1513.100290] mlx5_core 0000:0d:00.2:
mlx5_vdpa_show_mr_leaks:573:(pid 8565) warning: mkey still alive after
resource delete: mr: 000000000c5ccca2, mkey: 0x40000000, refcount: 2

Can you provide more details about the qemu version and the vdpa device
options used?

Also, which FW version are you using? There is a relevant bug in FW
22.41.1000 which was fixed in the latest FW (22.42.1000). Did you
encounter any FW syndromes in the host dmesg log?

Thanks,
Dragos