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Date:   Fri, 19 Feb 2021 19:00:00 -0800
From:   Si-Wei Liu <>
To:     Jason Wang <>, Eli Cohen <>
Subject: Re: [PATCH v1] vdpa/mlx5: Restore the hardware used index after
 change map

On 2/19/2021 6:38 PM, Jason Wang wrote:
>>> Right now the value is exposed to userspace via GET_VRING_BASE, so 
>>> only last_avail_idx is synced. If we need sync last_used_idx, we 
>>> should also sync pending indices which requires more thoughts.
>> Technically it doesn't sound right - crossing the boundary a bit even 
>> with simplified form of assumption. But depending on how userspace 
>> could make use of this API, it doesn't seem it breaks existing 
>> functionality for the moment.
> I don't get here, maybe you can explain a little bit more? 
Please refer to the email I just sent.


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