Re: [PATCH v3 0/7] migration/cpr: support vhost-vsock devices

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

On 8/11/26 5:12 PM, Andrey Drobyshev wrote:
> On 6/30/26 9:35 PM, Maciej S. Szmigiero wrote:
>> On 26.06.2026 18:46, Andrey Drobyshev wrote:
>>> v2 -> v3:
>>>
>>> Re-design device ownership hand-off (suggested by Dongli).  Do not rely
>>> on SETUP migration notifiers, as this approach forces us to reorder
>>> generic migration code (see v2 discussion).  Instead:
>>>
>>>    * .pre_save() releases ownership on the source (RESET_OWNER) once VM
>>>      is stopped;
>>>    * .realize() is adjusted to defer device ownership acquisition for an
>>>      incoming CPR;
>>>    * .post_load() actually claims the device (VHOST_SET_OWNER);
>>>    * FAILED migration event callback re-aquires the ownership on the
>>>      source after re_save released it.
>>>
>>> v2: https://lore.kernel.org/qemu-devel/57c9c9b3-d758-489b-95b8-d16c258b9b0c@virtuozzo.com
>>>
>>> Andrey Drobyshev (7):
>>>    vhost: add vhost_reset_owner op
>>>    vhost-vsock: don't reset connections during CPR
>>>    vhost-vsock: fix FD leak in realize()
>>>    vhost-vsock: preserve vhost FD during CPR
>>>    vhost: factor out vhost_dev_init_backend()
>>>    vhost: add vhost_dev_set_owner() / vhost_dev_reset_owner() helpers
>>>    vhost-vsock: hand off device ownership across CPR
>>>
>> These patches look okay CPR-wise, so:
>> Acked-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> # for CPR
>>
>> But the vsock parts still need review by their maintainers/reviewers.
>>
>> Thanks,
>> Maciej
>>
> 
> FYI the kernel counterpart series adding VHOST_RESET_OWNER ioctl to
> vsock ended up in Michael's vhost tree ([1], commits
> 6236e765f16d^..c7bfb8815d83).
> 
> Therefore - friendly ping for this series.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
> 
> Andrey

Another friendly ping