netdev - Re: [PATCH V7 mlx5-next 08/15] vfio: Define device migration protocol v2

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Date:   Wed, 16 Feb 2022 08:14:16 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        Yishai Hadas <yishaih@...dia.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "leonro@...dia.com" <leonro@...dia.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "mgurtovoy@...dia.com" <mgurtovoy@...dia.com>,
        "maorg@...dia.com" <maorg@...dia.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH V7 mlx5-next 08/15] vfio: Define device migration
 protocol v2

On Wed, Feb 16, 2022 at 03:17:36AM +0000, Tian, Kevin wrote:

> those requests don't rely on vCPUs but still take time to complete
> (thus may break SLA) and are invisible to migration driver (directly
> submitted by the guest thus cannot be estimated). So the only means 
> is for user to wait on a fd with a timeout (based on whatever SLA) and
> if expires then aborts migration (may retry later).

I think I explained in my other email how this can be implemented
today with v2 for STOP_COPY without an event fd.

Such a device might even be able to implement an abort..

Jason