netdev - Re: [RFC PATCH 1/6] vdpa: add bind

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Message-ID: <20221216081738.wlhevfmvzfs3rsrg@sgarzare-redhat>
Date:   Fri, 16 Dec 2022 09:17:38 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Andrey Zhadchenko <andrey.zhadchenko@...tuozzo.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, eperezma@...hat.com,
        stefanha@...hat.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 1/6] vdpa: add bind_mm callback

On Fri, Dec 16, 2022 at 02:37:45PM +0800, Jason Wang wrote:
>On Thu, Dec 15, 2022 at 12:30 AM Stefano Garzarella <sgarzare@...hat.com> wrote:
>>
>> This new optional callback is used to bind the device to a specific
>> address space so the vDPA framework can use VA when this callback
>> is implemented.
>>
>> Suggested-by: Jason Wang <jasowang@...hat.com>
>> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
>> ---
>>  include/linux/vdpa.h | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
>> index 6d0f5e4e82c2..34388e21ef3f 100644
>> --- a/include/linux/vdpa.h
>> +++ b/include/linux/vdpa.h
>> @@ -282,6 +282,12 @@ struct vdpa_map_file {
>>   *                             @iova: iova to be unmapped
>>   *                             @size: size of the area
>>   *                             Returns integer: success (0) or error (< 0)
>> + * @bind_mm:                   Bind the device to a specific address space
>> + *                             so the vDPA framework can use VA when this
>> + *                             callback is implemented. (optional)
>> + *                             @vdev: vdpa device
>> + *                             @mm: address space to bind
>
>Do we need an unbind or did a NULL mm mean unbind?

Yep, your comment in patch 6 makes it necessary. I will add it!

>
>> + *                             @owner: process that owns the address space
>
>Any reason we need the task_struct here?

Mainly to attach to kthread to the process cgroups, but that part is 
still in TODO since I need to understand it better.

Maybe we can remove the task_struct here and use `current` directly in 
the callback.

Thanks,
Stefano