RE: [PATCH v5 5/7] vfio/migration: Change vIOMMU blocker from global to per device

[Duan, Zhenzhong]

>-----Original Message-----
>From: Joao Martins <joao.m.martins@oracle.com>
>Sent: Friday, June 30, 2023 7:17 PM
>Subject: Re: [PATCH v5 5/7] vfio/migration: Change vIOMMU blocker from
>global to per device
>
>On 30/06/2023 08:36, Zhenzhong Duan wrote:
>> vIOMMU migration blocker can be consolidated to per device default
>> blocker, then some vIOMMU global blocker related functions and data
>> could be removed.
>>
>Perhaps expand to something like below on the why it justifies the
>consolidation:
>
>Contrary to multiple device blocker which needs to consider already-attached
>devices to unblock/block dynamically, the vIOMMU migration blocker is a
>device
>specific config. Meaning it only needs to know whether the device is bypassing
>or not the vIOMMU (via machine property, or per pxb-pcie::bypass_iommu),
>and
>does not need the state of currently present devices. For this reason, the
>vIOMMU global migration blocker can be consolidated into the per-device
>migration blocker, allowing us to remove some unnecessary code.
Great, will use this words.

Thanks
Zhenzhong